CN102089120A - Process for production of steel tube having polyolefin-coated inside surface - Google Patents

Process for production of steel tube having polyolefin-coated inside surface Download PDF

Info

Publication number
CN102089120A
CN102089120A CN2009801263001A CN200980126300A CN102089120A CN 102089120 A CN102089120 A CN 102089120A CN 2009801263001 A CN2009801263001 A CN 2009801263001A CN 200980126300 A CN200980126300 A CN 200980126300A CN 102089120 A CN102089120 A CN 102089120A
Authority
CN
China
Prior art keywords
steel
metal plug
steel pipe
grinding
quality
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN2009801263001A
Other languages
Chinese (zh)
Inventor
三村博幸
仮屋园义久
船津真一
佐藤哲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Publication of CN102089120A publication Critical patent/CN102089120A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L58/00—Protection of pipes or pipe fittings against corrosion or incrustation
    • F16L58/02—Protection of pipes or pipe fittings against corrosion or incrustation by means of internal or external coatings
    • F16L58/04—Coatings characterised by the materials used
    • F16L58/10—Coatings characterised by the materials used by rubber or plastics
    • F16L58/1009—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe
    • F16L58/1045—Coatings characterised by the materials used by rubber or plastics the coating being placed inside the pipe the coating being an extruded or a fused layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/02—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work
    • B24B5/06—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor involving centres or chucks for holding work for grinding cylindrical surfaces internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/222—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of pipes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B29/00—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents
    • B24B29/02—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces
    • B24B29/04—Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents designed for particular workpieces for rotationally symmetrical workpieces, e.g. ball-, cylinder- or cone-shaped workpieces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B5/00—Machines or devices designed for grinding surfaces of revolution on work, including those which also grind adjacent plane surfaces; Accessories therefor
    • B24B5/36—Single-purpose machines or devices
    • B24B5/40—Single-purpose machines or devices for grinding tubes internally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
    • B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
    • B24D13/10—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery comprising assemblies of brushes
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L9/00—Rigid pipes
    • F16L9/14—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups
    • F16L9/147—Compound tubes, i.e. made of materials not wholly covered by any one of the preceding groups comprising only layers of metal and plastics with or without reinforcement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2254/00—Tubes
    • B05D2254/04—Applying the material on the interior of the tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2350/00—Pretreatment of the substrate
    • B05D2350/60—Adding a layer before coating
    • B05D2350/65—Adding a layer before coating metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2507/00—Polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Rigid Pipes And Flexible Pipes (AREA)
  • Coating With Molten Metal (AREA)

Abstract

Provided is a process for the production of a steel tube of which the inside surface is coated with a polyolefin, in which the polyolefin tube on the inside surface rarely peels off even in an environment where freezing and thawing occur repeatedly or in a case where the steel tube is always filled with warm water, and which is also excellent in water-resistant adhesion. A process for the production of a steel tube of which the inside surface is coated with a polyolefin, which comprises subjecting a hot-dip zinc-plated steel tube, of which the inside and outside surfaces are plated with zinc by hot dipping, to grinding of the plating layer covering the inside surface with a steel wire brush to expose an iron-zinc alloy layer containing at least 6mass % of Fe, and then coating the resulting inside surface with a polyolefin, characterized in that the wire brush has a cylinder-like shape and is provided with steel wires arranged in radial directions radiately from the central axis of the cylinder and that the wire brush is inserted into the hot-dip zinc-plated steel tube while rotating on the central axis of the brush to grind the plating layer covering the inside surface.

Description

The inner surface polyolefin covers the manufacture method of steel pipe
Technical field
The present patent application relates to the manufacture method that inner surface polyolefin that the inner surface of having implemented zinc-plated steel pipe at inner surface and outer surface covers polyolefin pipe covers steel pipe.
The application advocates its priority based on Japanese patent application 2008-184988 number that proposed on July 16th, 2008, quotes its content here.
Background technology
Be used for feeding water and the steel pipe of draining, adopting to cover the plastic conduit that constitutes by synthetic resin such as polyolefin and carry out etch-proof inner surface resin to cover steel pipe at steel pipe internal-surface.This inner surface resin covers steel pipe owing to supply with chronically and use, so need sufficient adhesiveness between the inner surface of steel pipe and plastic conduit.Particularly big in the change of temperature and water temperature, freeze under the situation of thawing (freezing and thawing) at pipeline, if plastic conduit and the adhesiveness between the steel pipe that inner surface covers are insufficient, then under the effect of the peeling force that expansion or contraction because of plastic conduit cause, plastic conduit will be peeled off from steel pipe, if peel off development significantly, then often cause the obturation of pipeline.Therefore, particularly when inner surface has the inner surface of the steel pipe of zinc coating to cover the plastic conduit that is made of synthetic resin such as polyolefin, in order between zinc and synthetic resin, to obtain sufficient adhesiveness, adopt the method for in advance zinc surface of steel pipe internal-surface being carried out pre-treatment.
For example in patent documentation 1, disclose and ground to remove and to clean the method that white rust, impurity and grease divide.
In addition, in patent documentation 2, pre-treatment as coating steel pipe is disclosed, as long as with the inner surface of this steel pipe of metal plug polishing cleaning, remove pure zinc layer and the iron-zinc alloy layer that contains 6% above iron is exposed, cover polyolefin pipe then, then polyolefin pipe is difficult to peel off in freezing the thawing test.
Patent documentation 1: Japanese kokai publication sho 58-87045 communique
Patent documentation 2:PCT/JP2007/061256 communique
But, in patent documentation 1, in freezing to melt test etc., make the plastic conduit of inner surface be difficult to peel off etc. but not open fully about the grinding of concrete Ginding process and which kind of degree.In addition, in patent documentation 2,, but not open fully about shape, size, the appropraite condition of polishing cleaning and the inspection method after the polishing cleaning of concrete metal plug.
Summary of the invention
The present patent application is in order to solve the above problems, provide a kind of inner surface polyolefin to cover the manufacture method of steel pipe, even it is freezing, melting the environment that takes place repeatedly and often is being full of under the state of warm water, peeling off of polyolefin pipe also is difficult to take place, but also has good water-fast adhesiveness.
The inventor has carried out research with great concentration for solving above-mentioned problem, the result has obtained the understanding of the actual conditions of relevant following grinding, the inner surface that promptly has the hot-dip galvanized steel pipe of the iron-zinc alloy layer that contains the above Fe of 6 quality % between as the matrix iron surface of steel pipe mother metal and zinc coating, when covering the manufacturing of the resulting inner surface polyolefin covering of polyolefin steel pipe via binding agent, for improving polyolefinic adhesiveness, with the coating of this electro-galvanized steel pipe internal surface of steel metal plug grinding, thereby the iron-zinc alloy layer that contains the above Fe of 6 quality % is exposed.The present invention finishes with regard to being based on above-mentioned cognition, and its main points are as follows.
(1) a kind of inner surface polyolefin covers the manufacture method of steel pipe, it carries out grinding with the steel metal plug to the inner surface coating of having implemented the hot-dip galvanized steel pipe of galvanizing by dipping at inner surface and outer surface, iron-the zinc alloy layer that contains the above Fe of 6 quality % is exposed, cover polyolefin pipe then, this manufacture method is characterised in that: described steel metal plug is cylindric, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, be that rotating shaft makes this steel metal plug rotation with described central shaft on one side, be inserted in the described hot-dip galvanized steel pipe on one side, thus described steel pipe internal-surface coating carried out grinding.
(2) according to the manufacture method of (1) described inner surface polyolefin covering steel pipe, it is characterized in that: the Vickers of described steel wire (Vickers) hardness is more than 500.
(3) the described inner surface polyolefin of basis (1) or (2) covers the manufacture method of steel pipe, it is characterized in that: the chemical composition of described steel wire is, C:0.6～1.2 quality %, Mn:0.2～1.2 quality %, Si:0.1～1.5 quality %, below the P:0.05 quality %, below the S:0.04 quality %, remainder comprises Fe and unavoidable impurities.
(4) each described inner surface polyolefin of basis (1)～(3) covers the manufacture method of steel pipe, and it is characterized in that: brush plating has been implemented on the surface at described steel wire.
(5) a kind of inner surface polyolefin covers the manufacture method of steel pipe, and it is the manufacture method of each described inner surface polyolefin covering steel pipe of (1)～(4), and this manufacture method is characterised in that: the condition that satisfies following formula 1～formula 5.
F ( 1 ) = K × ( Db - Dpi ) × D w 3 Lw Formula 1
h ( 1 ) = Lb × 1 + ( n × π × Dpi V ) 2 Formula 2
S = Lb 2 × n × π × Dpi V Formula 3
Φ = F ( 1 ) × h ( 1 ) × N × m K × S Formula 4
2.6≤Φ≤85.4 formulas 5
F (1): the scuffing power of per 1 steel wire of steel metal plug (scratching force)
H (1): the steel metal plug when advancing the length of its brush length (Lb), the length (mm) of 1 steel wire grinding steel pipe internal-surface of this metal plug
φ: steel wire is steel metal plug m time of N root during by the electro-galvanized steel pipe internal surface, and it is long-pending to scratch power by the overall elongation length of this metal plug grinding of per unit area and steel wire
K: proportionality coefficient
Dpi: the internal diameter of hot-dip galvanized steel pipe (mm)
Db: the external diameter of steel metal plug (mm)
Lb: the length of the length direction of steel metal plug (mm)
Dw: the external diameter of the steel wire of steel metal plug (mm)
Lw: the length of the steel wire of steel metal plug (mm)
N: the radical of the steel wire of steel metal plug (root)
N: the rotating speed of steel metal plug (rpm)
V: the feed speed of steel metal plug (mm/ branch)
M: the number of pass times of steel metal plug (inferior)
S: the steel metal plug when advancing the length of its brush length (Lb), the area (mm of this metal plug grinding galvanizing by dipping steel pipe internal-surface 2)
(6) each described inner surface polyolefin of basis (1)～(5) covers the manufacture method of steel pipe, it is characterized in that: after the described grinding, be that 60～100 metal needle scratches the quality that described steel pipe internal-surface is judged the grinding state by adopting Vickers hardness.
(7) according to the manufacture method of (6) described inner surface polyolefin covering steel pipe, it is characterized in that: described metal needle is made of copper.
According to the present invention, inner surface with steel metal plug grinding hot-dip galvanized steel pipe, to remove pure zinc layer, iron-the zinc alloy layer that contains the above Fe of 6 quality % is exposed, so the adhesiveness of this grinding face and polyolefin pipe is stablized and strengthened, thereby even the inner surface polyolefin that can carry out also making in the pipeline that freezes to melt the inner surface polyolefin pipe to be difficult to peel off covers the industrial production of steel pipe.
Description of drawings
Fig. 1 is the cutaway view of hot-dip galvanized steel pipe and the cutaway view and the side view of steel metal plug.
Fig. 2 represents the steel metal plug when advancing the length suitable with its brush length L b, the diagram of the length h (1) of 1 steel wire grinding galvanizing by dipping steel pipe internal-surface and the relation of brush length L b.
The specific embodiment
The inventor covers polyolefin pipe at the inner surface of hot-dip galvanized steel pipe, via binding agent inner surface polyolefin covers in the manufacturing of steel pipe, found coating, the actual conditions that iron-zinc alloy layer of containing the above Fe of 6 quality % is exposed with this electro-galvanized steel pipe internal surface of steel metal plug grinding.
Expose for the inner surface at hot-dip galvanized steel pipe makes the iron-zinc alloy layer that contains the above Fe of 6 quality %, the microcosmic that must follow the trail of the electro-galvanized steel pipe internal surface is concavo-convex and evenly and effectively carry out grinding.For this reason, as shown in Figure 1, adopt columned steel metal plug, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation as rotating shaft with above-mentioned central shaft on one side, be inserted in the above-mentioned hot-dip galvanized steel pipe on one side, the inner surface to above-mentioned hot-dip galvanized steel pipe carries out grinding thus, thereby can realize above-mentioned purpose.That is because the microcosmic of the steel wire of this steel metal plug tracking electro-galvanized steel pipe internal surface is concavo-convex, thereby evenly and effectively carries out grinding.
If the Vickers hardness of above-mentioned steel wire is more than 500, then grinding efficiency is good.That is because if the difference of the Vickers hardness of the Vickers hardness of this steel wire and zinc is bigger, and then the grinding efficiency of zinc is just good.
The chemical composition of above-mentioned steel wire preferably, C:0.6～1.2 quality %, Mn:0.2～1.2 quality %, Si:0.1～1.5 quality %, P:0.05 quality % are following, S:0.04 quality %, remainder comprise Fe and unavoidable impurities.If the lower limit of C, Si, Mn is lower than above-mentioned scope, then can not obtain necessary high rigidity; In addition, if higher limit surpasses above-mentioned scope, then toughness reduces, so be set at above-mentioned value.In addition, if the higher limit of P, S surpasses above-mentioned scope, then because of segregation causes embrittlement etc., so be set at above-mentioned higher limit.The most important thing is, and steel wire must be taken into account high rigidity and anti-breaking property, in its scope, even for example other element trace contains, also can not damage the present patent application.
Antirust as above-mentioned steel wire preferably implemented brush plating on this steel wire.That is to bring the inner surface of hot-dip galvanized steel pipe into because can prevent iron rust.
Moreover, when the inventor states the steel metal plug in the use, if find that the inner surface of grinding hot-dip galvanized steel pipe then can make the iron-zinc alloy layer that contains the above Fe of 6 quality % expose under the condition that satisfies following formula 1～formula 5.
F ( 1 ) = K × ( Db - Dpi ) × D w 3 Lw Formula 1
h ( 1 ) = Lb × 1 + ( n × π × Dpi V ) 2 Formula 2
S = Lb 2 × n × π × Dpi V Formula 3
Φ = F ( 1 ) × h ( 1 ) × N × m K × S Formula 4
2.6≤Φ≤85.4 formulas 5
Symbol in the above-mentioned formula is defined as follows, and a part of symbol is also illustrated among Fig. 1 and Fig. 2.
F (1): the scuffing power of per 1 steel wire of steel metal plug
H (1): the steel metal plug when advancing the length of its brush length (Lb), the length (mm) of 1 steel wire grinding steel pipe internal-surface of this metal plug
φ: steel wire is steel metal plug m time of N root during by the electro-galvanized steel pipe internal surface, and it is long-pending to scratch power by the overall elongation length of this metal plug grinding of per unit area and steel wire
K: proportionality coefficient
Dpi: the internal diameter of hot-dip galvanized steel pipe (mm)
Db: the external diameter of steel metal plug (mm)
Lb: the length of the length direction of steel metal plug (mm)
Dw: the external diameter of the steel wire of steel metal plug (mm)
Lw: the length of the steel wire of steel metal plug (mm)
N: the radical of the steel wire of steel metal plug (root)
N: the rotating speed of steel metal plug (rpm)
V: the feed speed of steel metal plug (mm/ branch)
M: the number of pass times of steel metal plug (inferior)
S: the steel metal plug when advancing the length of its brush length (Lb), the area (mm of this metal plug grinding galvanizing by dipping steel pipe internal-surface 2)
The power F (1) of 1 steel wire scuffing electro-galvanized steel pipe internal surface of steel metal plug can be as shown in Equation 1.
The steel metal plug is when advancing the length of its brush length L b, and the length h (1) of 1 steel wire grinding galvanizing by dipping steel pipe internal-surface of this metal plug can be as shown in Equation 2.
The steel metal plug is when advancing the length of its brush length L b, and the area S of this metal plug grinding galvanizing by dipping steel pipe internal-surface can be as shown in Equation 3.
Be steel metal plug m time of N root during by the electro-galvanized steel pipe internal surface with steel wire, the overall elongation length of the steel wire institute grinding of this steel metal plug of per unit area and steel wire scratch the long-pending φ of power can be as shown in Equation 4.
Shown in embodiment 1～embodiment 7, can confirm: if the numerical value of the φ of formula 4 is 2.6～85.4, the iron-zinc alloy layer that then contains the above Fe of 6 quality % exposes, and the stable adhesiveness of this grinding face and polyolefin pipe is guaranteed.In other words, be under the situation of grinding condition of less than 2.6 at the numerical value of the φ of formula 4, even with the inner surface of steel metal plug grinding hot-dip galvanized steel pipe, pure zinc layer also can be residual, and the exposing of iron-zinc alloy layer of containing the above Fe of 6 quality % just becomes insufficient.Surpass at the numerical value of the φ of formula 4 under the situation of 85.4 grinding condition, the frictional heating of the inner surface of invar system metal plug and coating steel pipe and become high temperature, grinding efficiency significantly reduces, thereby pure zinc layer is residual, and the exposing of iron-zinc alloy layer of containing the above Fe of 6 quality % just becomes insufficient.
In addition, different on Vickers hardness of the pure zinc layer that the inventor is conceived to the galvanizing by dipping top layer and iron-zinc alloy layer are used it for the inspection of judging that whether iron-zinc alloy layer of containing the above Fe of 6 quality % exposes at the inner surface of the hot-dip galvanized steel pipe that passes through the steel metal plug.
Promptly, the Vickers hardness less than 60 of pure zinc layer, on the other hand, the Vickers hardness that contains iron-zinc alloy layer of the above Fe of 6 quality % surpasses 100, use Vickers hardness between it and be 60～100 metal needle, the inner surface with the hot-dip galvanized steel pipe of steel metal plug grinding is scratched inspection.Under grinding and inadequate situation and since residual have compare the less pure zinc layer of Vickers hardness with this metal needle, so carve when surperficial when drawing with this inspections pin, then at the surface of coating steel pipe inner surface formation ditch.On the other hand, under the sufficient situation of grinding, owing to compare the bigger iron-zinc alloy layer that contains the above Fe of 6 quality % of Vickers hardness with this metal needle and expose, so when drawing with this metal needle when carving the surface, the top of this metal needle is reamed, and the metal dust that is reamed is attached to the surface of the iron-zinc alloy layer that contains the above Fe of 6 quality %.
Vickers hardness is 60 to 100 metal, and known have aluminium, copper, brass.Aluminium is owing to being the silver color identical with the zinc coating tone, so the differentiation of aluminum and zinc judgement is very difficult when perusal, as checking that the material with metal needle is unaccommodated.Copper, brass are different with the zinc coating tone, as checking that the material with metal needle is fit to.But brass is according to obtaining the difference in place, and the mixing ratio of copper and zinc is often different, occurs deviation on Vickers hardness easily, is the material of only inspection usefulness metal needle so do not rely on the copper that obtains the place and have a constant Vickers hardness.
Embodiment
Describe with regard to embodiments of the invention.The condition of embodiment is the condition example that adopts in order to confirm operational feasibility of the present invention and effect, and the present invention is not limited to these conditions.Only otherwise break away from aim of the present invention and can realize purpose of the present invention, the present invention just can adopt various conditions.
(embodiment 1)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 1.In the present embodiment, the feed speed of steel metal plug is changed, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, take out galvanized pipe and cool off from heating furnace, when temperature reaches 70 ℃, discharge and enclose air, (steel pipe of the present invention a) thereby obtain having covered the coating steel pipe of high density polyethylene pipe at inner surface.
Cut off after the steel pipe a of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 1, just under the situation in the numerical value of the φ of formula 4 falls into the scope of above-mentioned formula 5, in the inspection of adopting metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
(embodiment 2)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 2.In the present embodiment, the number of pass times of steel metal plug is changed, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, from heating furnace, take out galvanized pipe and cool off, when temperature reaches 70 ℃, discharge and enclose air, thereby obtain having covered the coating steel pipe (steel pipe b of the present invention) of high density polyethylene pipe at inner surface.
Cut off after the steel pipe b of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 2, just the numerical value at the φ of formula 4 surpasses under 2.4 the situation, in the check result that adopts metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
Preferably set the number of pass times of steel metal plug as can be known, thereby the numerical value of the φ of formula 4 is fallen in the scope of above-mentioned formula 5.
(embodiment 3)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 3.In the present embodiment, make the rotation speed change of steel metal plug, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, from heating furnace, take out galvanized pipe and cool off, when temperature reaches 70 ℃, discharge and enclose air, thereby obtain having covered the coating steel pipe (steel pipe c of the present invention) of high density polyethylene pipe at inner surface.
Cut off after the steel pipe c of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 3, just under the situation in the numerical value of the φ of formula 4 falls into the scope of above-mentioned formula 5, in the inspection of adopting metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
(embodiment 4)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 4.In the present embodiment, make the length variations of the steel wire of steel metal plug, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, from heating furnace, take out galvanized pipe and cool off, when temperature reaches 70 ℃, discharge and enclose air, thereby obtain having covered the coating steel pipe (steel pipe d of the present invention) of high density polyethylene pipe at inner surface.
Cut off after the steel pipe d of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 4, just under the situation in the numerical value of the φ of formula 4 falls into the scope of above-mentioned formula 5, in the inspection of adopting metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
(embodiment 5)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 5.In the present embodiment, the external diameter of the steel wire of steel metal plug is changed, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, from heating furnace, take out galvanized pipe and cool off, when temperature reaches 70 ℃, discharge and enclose air, thereby obtain having covered the coating steel pipe (steel pipe e of the present invention) of high density polyethylene pipe at inner surface.
Cut off after the steel pipe e of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 5, just under the situation in the numerical value of the φ of formula 4 falls into the scope of above-mentioned formula 5, in the inspection of adopting metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
(embodiment 6)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 6.In the present embodiment, the external diameter of steel metal plug is changed, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, from heating furnace, take out galvanized pipe and cool off, when temperature reaches 70 ℃, discharge and enclose air, thereby obtain having covered the coating steel pipe (steel pipe f of the present invention) of high density polyethylene pipe at inner surface.
Cut off after the steel pipe f of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 6, just under the situation in the numerical value of the φ of formula 4 falls into the scope of above-mentioned formula 5, in the inspection of adopting metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
(embodiment 7)
Inner surface and outer surface to steel pipe (SGP100A * 6000mm is long) carry out galvanizing by dipping, thereby obtain coating steel pipe.At this moment, the amount of the aluminium that zinc coating contained is set at 0.01 quality %.
The steel metal plug has the external diameter bigger than the internal diameter of coating steel pipe, it is cylindric that shape is, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, make this steel metal plug rotation on one side, be inserted in the coating steel pipe on one side, the zinc coating to the coating steel pipe inner surface carries out grinding thus.
The Vickers hardness of testing the steel wire of employed steel metal plug is 500, and the chemical composition of this steel wire is C:0.81 quality %, Mn:0.47 quality %, Si:0.20 quality %, P:0.05 quality %, S:0.04 quality %.
Grinding condition is as shown in table 7.In the present embodiment, make the rotation speed change of steel metal plug, per 1 level is carried out grinding internal surface to 10 hot-dip galvanized steel pipes, amounts to implement 5 levels.
After carrying out the 1st and the 10th grinding internal surface continuously, measure the surface temperature of steel metal plug axle immediately, with the situation of investigation frictional heating.
Use metal needle made of copper to draw the inner surface of carving the coating steel pipe that carried out grinding internal surface, check the quality of grinding state.
Secondly, it is slightly little and fold at outer surface layer that thickness is arranged is the maleic anhydride modified poly high density polyethylene pipe of 100 μ m to prepare internal diameter than this coating steel pipe.The thickness of high density polyethylene (HDPE) is 2.0mm, and fusing point is 125 ℃.
High density polyethylene pipe is inserted the inside of the coating steel pipe that carried out grinding internal surface, at its two end cap loam cake, be pressed into air and seal to the inside of high density polyethylene pipe, then, in heating furnace, be heated to 160 ℃, make the high density polyethylene pipe fusion, thereby be crimped on the inner surface of coating steel pipe.
Afterwards, from heating furnace, take out galvanized pipe and cool off, when temperature reaches 70 ℃, discharge and enclose air, thereby obtain having covered the coating steel pipe (steel pipe g of the present invention) of high density polyethylene pipe at inner surface.
Cut off after the steel pipe g of the present invention, grind its section and observe, and carried out freezing to melt test and warm water immersion is tested with light microscope.
In the observation of adopting light microscope to carry out, as test film, gather the wide circumferencial direction section of 20mm, imbed in the resin and after fixing, section is ground, use 3% nitric acid-ethanolic solution etch zinc coating afterwards, use the observation by light microscope zinc coating, whether iron-zinc alloy layer that investigation contains the above Fe of 6 quality % exposes on top layer.
About freezing to melt test, be to be cut to the length of 150mm and the test film that obtains is erected in the container that has held running water with the state that about 1/3 of length is immersed in the water, each container is put into-10 ℃ cryostat, freezed them 23 hours, the high temperature groove of then putting into 60 ℃ carries out 1 hour thawing, be operating as 1 circulation with such thawing of freezing, carry out 100 circulations repeatedly.
About the warm water immersion test, be that the test film that will be cut to the length of 150mm and obtain is immersed in the container that has held running water, each container is put into 40 ℃ thermostat, places 3 months.
After freezing to melt test and warm water immersion and testing,, investigated and had or not peeling off of high density polyethylene pipe for test film.
As can be recognized from Table 7, just under the situation in the numerical value of the φ of formula 4 falls into the scope of above-mentioned formula 5, in the inspection of adopting metal needle made of copper, can see that on the surface of the coating steel pipe of grinding adhering to of copper arranged; Adopt in the observation that microscope carries out at the zinc coating section, the iron-zinc alloy layer that contains the above Fe of 6 quality % exposes on top layer.Moreover the result according to freezing to melt test, warm water immersion test does not have peeling off of polyethylene pipe as can be known yet.
The frictional heating of steel metal plug after the 1st of continuous grinding and the 10th grinding, has been measured the surface temperature of steel metal plug axle at once in whole 5 levels, the result is lower than 150 ℃, thereby grinding efficiency is good.
Table 1
Figure BDA0000043031020000201
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
Table 2
Figure BDA0000043031020000211
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
Table 3
Figure BDA0000043031020000221
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
Table 4
Figure BDA0000043031020000231
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
Table 5
Figure BDA0000043031020000241
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
Table 6
Figure BDA0000043031020000251
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
Table 7
Figure BDA0000043031020000261
(annotating 1) zero: the iron-zinc alloy layer that contains the above Fe of 6 quality % exists and exposes, *: do not expose
(annotating 2) zero: the surface temperature of brush axle is lower than 150 ℃, *: more than 150 ℃
According to the present invention, owing to can adopt the inner surface of steel metal plug grinding hot-dip galvanized steel pipe, to remove pure zinc layer, thereby the iron-zinc alloy layer that contains the above Fe of 6 quality % is exposed effectively, so the adhesiveness of this grinding face and polyolefin pipe is stablized and is strengthened, even thereby the inner surface polyolefin that can carry out also making in the pipeline that freezes to melt the inner surface polyolefin pipe to be difficult to peel off covers the industrial production of steel pipe, this is exceedingly useful on industry.
Symbol description:
1 hot-dip galvanized steel pipe
2 steel metal plugs
2 ' steel metal plug (being illustrated in the illustrated position of this electric metal silk brush when advancing the length suitable) with its brush length (Lb)

Claims (7)

1. an inner surface polyolefin covers the manufacture method of steel pipe, it carries out grinding with the steel metal plug to the inner surface coating of having implemented the hot-dip galvanized steel pipe of galvanizing by dipping at inner surface and outer surface, iron-the zinc alloy layer that contains the above Fe of 6 quality % is exposed, cover polyolefin pipe then, this manufacture method is characterised in that: described steel metal plug is cylindric, and towards radial direction be configured to radial from the central shaft of this cylinder steel wire, be that rotating shaft makes this steel metal plug rotation with described central shaft on one side, be inserted in the described hot-dip galvanized steel pipe on one side, thus described steel pipe internal-surface coating carried out grinding.
2. inner surface polyolefin according to claim 1 covers the manufacture method of steel pipe, and it is characterized in that: the Vickers hardness of described steel wire is more than 500.
3. inner surface polyolefin according to claim 1 and 2 covers the manufacture method of steel pipe, it is characterized in that: the chemical composition of described steel wire is, C:0.6～1.2 quality %, Mn:0.2～1.2 quality %, Si:0.1～1.5 quality %, below the P:0.05 quality %, below the S:0.04 quality %, remainder comprises Fe and unavoidable impurities.
4. cover the manufacture method of steel pipe according to each described inner surface polyolefin of claim 1～3, it is characterized in that: brush plating has been implemented on the surface at described steel wire.
5. an inner surface polyolefin covers the manufacture method of steel pipe, and it is the manufacture method that each described inner surface polyolefin of claim 1～4 covers steel pipe, and this manufacture method is characterised in that: the condition that satisfies following formula 1～formula 5;
F ( 1 ) = K × ( Db - Dpi ) × D w 3 Lw Formula 1
h ( 1 ) = Lb × 1 + ( n × π × Dpi V ) 2 Formula 2
S = Lb 2 × n × π × Dpi V Formula 3
Φ = F ( 1 ) × h ( 1 ) × N × m K × S Formula 4
2.6≤Φ≤85.4 formulas 5
F (1): the scuffing power of per 1 steel wire of steel metal plug;
H (1): the steel metal plug when advancing the length of its brush length L b, the length of 1 steel wire grinding steel pipe internal-surface of this metal plug, unit is mm;
φ: steel wire is steel metal plug m time of N root during by the electro-galvanized steel pipe internal surface, and it is long-pending to scratch power by the overall elongation length of this metal plug grinding of per unit area and steel wire;
K: proportionality coefficient;
Dpi: the internal diameter of hot-dip galvanized steel pipe, unit are mm;
Db: the external diameter of steel metal plug, unit are mm;
Lb: the length of the length direction of steel metal plug, unit is mm;
Dw: the external diameter of the steel wire of steel metal plug, unit are mm;
Lw: the length of the steel wire of steel metal plug, unit is mm;
N: the radical of the steel wire of steel metal plug, unit are root;
N: the rotating speed of steel metal plug, unit are rpm;
V: the feed speed of steel metal plug, unit is the mm/ branch;
M: the number of pass times of steel metal plug, unit are inferior;
S: the steel metal plug when advancing the length of its brush length L b, the area of this metal plug grinding galvanizing by dipping steel pipe internal-surface, unit is mm 2
6. cover the manufacture method of steel pipe according to each described inner surface polyolefin of claim 1～5, it is characterized in that: after the described grinding, be that 60～100 metal needle scratches the quality that described steel pipe internal-surface is judged the grinding state by adopting Vickers hardness.
7. inner surface polyolefin according to claim 6 covers the manufacture method of steel pipe, and it is characterized in that: described metal needle is made of copper.
CN2009801263001A 2008-07-16 2009-07-15 Process for production of steel tube having polyolefin-coated inside surface Pending CN102089120A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2008-184988 2008-07-16
JP2008184988A JP4691141B2 (en) 2008-07-16 2008-07-16 Manufacturing method of inner surface polyolefin coated steel pipe
PCT/JP2009/062828 WO2010008025A1 (en) 2008-07-16 2009-07-15 Process for production of steel tube having polyolefin-coated inside surface

Publications (1)

Publication Number Publication Date
CN102089120A true CN102089120A (en) 2011-06-08

Family

ID=41550427

Family Applications (1)

Application Number Title Priority Date Filing Date
CN2009801263001A Pending CN102089120A (en) 2008-07-16 2009-07-15 Process for production of steel tube having polyolefin-coated inside surface

Country Status (5)

Country Link
JP (1) JP4691141B2 (en)
KR (1) KR101279334B1 (en)
CN (1) CN102089120A (en)
TW (1) TWI392579B (en)
WO (1) WO2010008025A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106425788A (en) * 2016-11-04 2017-02-22 重庆兴宝兴玻璃制品有限公司 Glass mold intelligent polisher
CN106425782A (en) * 2016-11-04 2017-02-22 重庆兴宝兴玻璃制品有限公司 Glass mold cavity polishing device

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102184763B (en) * 2011-03-07 2013-01-02 吴江市中信科技有限公司 Copper pipe inner wall dehairer
WO2017134343A1 (en) * 2016-02-04 2017-08-10 Picote Oy Ltd Coating device, coating system and a method
JP6854168B2 (en) * 2017-03-27 2021-04-07 株式会社栗本鐵工所 Internal surface treatment method for pipes
CN106994637A (en) * 2017-03-28 2017-08-01 吴小江 A kind of mechanical outer surface of steel tube mould processing device
CN115386822B (en) * 2022-10-28 2022-12-23 天津华源线材制品有限公司 Galvanizing processing device for galvanized wire processing and processing method thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0332560A (en) * 1989-06-26 1991-02-13 Tokyo Gas Co Ltd Brush-type pipe inner surface polishing device
JPH03104634A (en) * 1989-09-19 1991-05-01 Nkk Corp Production of steel pipe having outer face coated with plastic
JP2005071690A (en) * 2003-08-21 2005-03-17 Ngk Insulators Ltd Positive electrode container for sodium-sulfur battery and its manufacturing method
TW200806458A (en) * 2006-05-30 2008-02-01 Nippon Steel Corp Internally polyolefin coated steel pipe having excellent durability, method for producing the same, and plated steel pipe used for the coated steel pipe

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02167657A (en) * 1988-12-16 1990-06-28 Toukan Eng Kk Polishing device for pipe inner face
JP2003124159A (en) * 2001-10-16 2003-04-25 Asahi Denka Kogyo Kk Aqueous lapping liquid and aqueous lapping compound
JP5042555B2 (en) * 2006-08-03 2012-10-03 新日本製鐵株式会社 Zinc-based plated steel sheet having a thin film primary anticorrosive coating layer with excellent surface conductivity and method for producing the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0332560A (en) * 1989-06-26 1991-02-13 Tokyo Gas Co Ltd Brush-type pipe inner surface polishing device
JPH03104634A (en) * 1989-09-19 1991-05-01 Nkk Corp Production of steel pipe having outer face coated with plastic
JP2005071690A (en) * 2003-08-21 2005-03-17 Ngk Insulators Ltd Positive electrode container for sodium-sulfur battery and its manufacturing method
TW200806458A (en) * 2006-05-30 2008-02-01 Nippon Steel Corp Internally polyolefin coated steel pipe having excellent durability, method for producing the same, and plated steel pipe used for the coated steel pipe

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106425788A (en) * 2016-11-04 2017-02-22 重庆兴宝兴玻璃制品有限公司 Glass mold intelligent polisher
CN106425782A (en) * 2016-11-04 2017-02-22 重庆兴宝兴玻璃制品有限公司 Glass mold cavity polishing device
CN106425788B (en) * 2016-11-04 2018-03-20 重庆兴宝兴玻璃制品有限公司 Glass mold intelligence polisher

Also Published As

Publication number Publication date
WO2010008025A1 (en) 2010-01-21
KR20110022042A (en) 2011-03-04
JP4691141B2 (en) 2011-06-01
TW201008762A (en) 2010-03-01
JP2010023142A (en) 2010-02-04
TWI392579B (en) 2013-04-11
KR101279334B1 (en) 2013-06-26

Similar Documents

Publication Publication Date Title
CN102089120A (en) Process for production of steel tube having polyolefin-coated inside surface
CA3008781C (en) Threaded connection for pipe or tube and method for producing the threaded connection for pipe or tube
EP3396222B1 (en) Threaded connection for pipe or tube and method of producing the threaded connection for pipe and tube.
BE1005554A3 (en) Method of manufacturing a tube wall multiple.
CN101809183B (en) Pipe provided with corrosion prevention layer on the outside surface, process for production of the same, and process for production of alloy wires to be used for corrosion prevention of outside surface of the pipe
CN108138298A (en) Steel plate coated with the metal coating based on aluminium and comprising titanium
US2084209A (en) Coated metal pipe and process of producing the same
CN101213323A (en) Surface-treated stainless-steel sheet with excellent corrosion resistance in salt damage environment for automotive fuel tank
CN101409390B (en) Method for continuously manufacturing zinc-coating-steel grounding electrode
CA1293163C (en) Deposition process of a protective coating on steel products
JPS6052569A (en) Plated steel sheet for colored galvanized steel sheet
CN102688846B (en) Metal corrosion-preventing method
TWI595951B (en) Discharge processing electrode line
JP3208444B2 (en) Manufacturing method of hot-dip zinc-aluminum alloy plated wire
Radu et al. CORROSION BEHAVIOR OF TINNED BRASS
CN106191724A (en) Metal alloy wire manufacture method for spark machined
KR200283888Y1 (en) A steel pipe covered with polyethylene
Schleitweiler et al. Corrosion of copper in Mound's single-pass potable water systems
KR20030086663A (en) A steel pipe covered with polyethylene and the same producing method
BR112020007202B1 (en) THREADED PIPE CONNECTION AND METHOD FOR PRODUCING THE THREADED TUBE CONNECTION
JPH04301081A (en) Copper pipe having improved corrosion resistance and treating method for obtaining such copper pipe
Zhang et al. On-line Testing of 316L Stainless Steel
MX2012011529A (en) System and process for wire cleaning in a galvanizing production line.
none Industrial News
JPH01132742A (en) Production of zinc or zinc alloy-coated steel wire

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
REG Reference to a national code

Ref country code: HK

Ref legal event code: DE

Ref document number: 1155125

Country of ref document: HK

ASS Succession or assignment of patent right

Owner name: NIPPON STEEL + SUMITOMO METAL CORPORATION

Free format text: FORMER OWNER: SHIN NIPPON STEEL LTD.

Effective date: 20130321

C41 Transfer of patent application or patent right or utility model
TA01 Transfer of patent application right

Effective date of registration: 20130321

Address after: Tokyo, Japan

Applicant after: Nippon Steel Corporation

Address before: Tokyo, Japan

Applicant before: Nippon Steel Corporation

C02 Deemed withdrawal of patent application after publication (patent law 2001)
WD01 Invention patent application deemed withdrawn after publication

Application publication date: 20110608

REG Reference to a national code

Ref country code: HK

Ref legal event code: WD

Ref document number: 1155125

Country of ref document: HK