CN105150608A - Stainless steel/carbon steel bi-metal thread steel and composite molding technology thereof - Google Patents
Stainless steel/carbon steel bi-metal thread steel and composite molding technology thereof Download PDFInfo
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- CN105150608A CN105150608A CN201510695276.0A CN201510695276A CN105150608A CN 105150608 A CN105150608 A CN 105150608A CN 201510695276 A CN201510695276 A CN 201510695276A CN 105150608 A CN105150608 A CN 105150608A
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- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 170
- 239000010935 stainless steel Substances 0.000 title claims abstract description 161
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 103
- 239000010959 steel Substances 0.000 title claims abstract description 103
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 95
- 239000010962 carbon steel Substances 0.000 title claims abstract description 95
- 238000000465 moulding Methods 0.000 title claims abstract description 21
- 239000002131 composite material Substances 0.000 title claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 title abstract description 11
- 239000002184 metal Substances 0.000 title abstract description 10
- 238000005516 engineering process Methods 0.000 title abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 19
- 238000005098 hot rolling Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 24
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- 238000004140 cleaning Methods 0.000 claims description 17
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 12
- 229910000963 austenitic stainless steel Inorganic materials 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims description 6
- 229910018651 Mn—Ni Inorganic materials 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 18
- 238000005096 rolling process Methods 0.000 abstract description 12
- 238000005260 corrosion Methods 0.000 abstract description 9
- 230000007797 corrosion Effects 0.000 abstract description 8
- 230000000694 effects Effects 0.000 abstract description 5
- 238000003754 machining Methods 0.000 abstract description 3
- 239000002994 raw material Substances 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 230000002421 anti-septic effect Effects 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000010970 precious metal Substances 0.000 description 2
- 238000010010 raising Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000885 Dual-phase steel Inorganic materials 0.000 description 1
- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 150000001805 chlorine compounds Chemical class 0.000 description 1
- 229910000423 chromium oxide Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000005555 metalworking Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 125000004430 oxygen atom Chemical group O* 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000004881 precipitation hardening Methods 0.000 description 1
- 239000003507 refrigerant Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000010186 staining Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B1/00—Layered products having a general shape other than plane
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
- B32B15/011—Layered products comprising a layer of metal all layers being exclusively metallic all layers being formed of iron alloys or steels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/0012—Mechanical treatment, e.g. roughening, deforming, stretching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/162—Cleaning
-
- 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
- F16S—CONSTRUCTIONAL ELEMENTS IN GENERAL; STRUCTURES BUILT-UP FROM SUCH ELEMENTS, IN GENERAL
- F16S3/00—Elongated members, e.g. profiled members; Assemblies thereof; Gratings or grilles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pressure Welding/Diffusion-Bonding (AREA)
Abstract
The embodiment of the invention discloses stainless steel/carbon steel bi-metal thread steel and a composite molding technology thereof. The stainless steel/carbon steel bi-metal thread steel comprises a stainless steel layer and a carbon steel core. The composite molding technology of the stainless steel/carbon steel bi-metal thread steel comprises the steps that a carbon steel core blank is loaded into a hollow stainless steel tube blank to form a bi-metal blank, and the carbon steel blank and the stainless steel tube blank are in interference fit; heating and hot-rolling machining are performed on the assembled bi-metal blank to form the bi-metal thread steel. Due to the fact that the interference fit and rolling pressure effects of the molding technology exist on the bonding interface of the stainless steel layer and the carbon steel core, the metallurgical bonding interface with the high bonding strength and the good technological performance can be formed. Meanwhile, the bi-metal thread steel is adopted for replacing stainless steel thread steel in the prior art, and on the premise that the corrosion resistance of the thread steel is ensured, stainless steel materials are saved, the engineering cost is lowered, and the strength of the thread steel is effectively improved, so that the bi-metal thread steel has the wide application prospect.
Description
Technical field
The present invention relates to metal material and metallurgical technical field of steel rolling, particularly relate to a kind of stainless steel/carbon bimetallic screw-thread steel and composite molding technique thereof.
Background technology
Screw-thread steel is surface reinforcing bar with ribbing, is being commonly called as of hot rolled ribbed bars, usually indulges rib and equally distributed cross rib along its length with twice.Screw-thread steel is due to the effect of rib, and concrete has larger bonding ability, can better bear the effect of external force, is therefore widely used in various building structure.Along with social progress, people propose more and more higher requirement to the security performance of building and service life etc., conventional threads steel is made up of carbon steel, but there is oxidizable, corrosion-prone shortcoming in carbon steel, especially in waterside, the underwater concrete such as coastal, riverine, along with passage of time, villaumite aggravates the corrosion of reinforcement in concrete, has a strong impact on service life and the security of building.
For these reasons, in prior art, use the stainless steel screw-thread steel be made up of stainless steel raw material in bridge, coast defence engineering etc. in a large number, wherein, stainless steel can support erosion-resisting a kind of high-alloy steel in air or chemical attack medium.Because stainless steel has good corrosion resistance, so use stainless steel screw-thread steel that structure member can be made for good and all to keep the integrality of engineering design.
At present, main alloy element in stainless steel is Cr, only have when Cr content reaches certain value, steel just has corrosion resistance, and therefore the general Cr content of stainless steel is at least 12%, simultaneously in order to make stainless steel have better resistance to grain boundary corrosion, also need containing precious metal elements such as Ni, Ti, Mn, N, Nb, Mo and Si in stainless steel, but, a large amount of precious metal can be consumed when preparing stainless steel screw-thread steel like this, causing engineering material cost high.
Summary of the invention
Provide a kind of stainless steel/carbon bimetallic screw-thread steel and composite molding technique thereof in the embodiment of the present invention, to solve how under guaranteeing that screw-thread steel used meets the prerequisite of construction quality, reduce engineering material Cost Problems to greatest extent.
In order to solve the problems of the technologies described above, the embodiment of the invention discloses following technical scheme:
A kind of stainless steel/carbon bimetallic screw-thread steel, comprises stainless steel layer and carbon steel core, wherein:
Described stainless steel layer is wrapped in the periphery of described carbon steel core, and the inwall of described stainless steel layer and the outer wall of described carbon steel core are combined closely, and the combination interface of described stainless steel layer and described carbon steel core is metallurgical bonding interface;
The periphery of described stainless steel layer and described carbon steel core is one-body molded crossrib structure.
Preferably, the weight of described stainless steel layer is the 8%-30% of described bimetallic screw-thread steel gross weight.
Preferably, the thickness of described stainless steel layer is the 5%-18% of described bimetallic screw-thread steel diameter.
Preferably, described stainless steel layer comprises Cr-Ni series austenitic stainless steel or Cr-Mn-Ni series austenitic stainless steel.
Preferably, described carbon steel core comprises HRB335 steel core, HRB400 steel core or HRB500 steel core.
A kind of stainless steel/carbon bimetallic screw-thread steel composite molding technique, comprises the following steps:
Stainless-steel pipe blank carbon steel core blank being loaded hollow forms bimetallic blank, and wherein said carbon steel core blank and described stainless-steel pipe blank are interference fit;
The described bimetallic blank assembled is put into heating furnace heat;
Described bimetallic blank after heating is carried out hot rolling, forms bimetallic screw-thread steel.
Preferably, before carbon steel core blank being loaded the stainless-steel pipe blank formation bimetallic blank of hollow, also comprise:
Described carbon steel core blank and described stainless-steel pipe blank are carried out eliminating rust, clearing up burr and cleaning treatment respectively successively.
Preferably, described cleaning treatment comprises pickling processes and acetone cleaning treatment.
Preferably, stainless-steel pipe blank carbon steel core blank being loaded hollow forms bimetallic blank, also comprises:
Welded seal is carried out in the position of the outer wall of the two ends end face of described bimetallic blank, described carbon steel core blank and the contact internal walls of described stainless-steel pipe blank.
Preferably, the method described carbon steel core blank being loaded described stainless-steel pipe blank comprises forcing press plunging or cold charge.
Preferably, the magnitude of interference of described carbon steel core blank and described stainless-steel pipe blank interference fit is 0-0.1mm.
Preferably, after the described bimetallic blank assembled being put into heating furnace heating, tapping temperature is 1050 DEG C-1280 DEG C.
Preferably, described stainless-steel pipe blank is stainless-steel seamless pipe.
Preferably, the internal diameter of described stainless-steel pipe blank and the shape of described carbon steel core blank external diameter comprise circular or square.
From above technical scheme, a kind of stainless steel/carbon bimetallic screw-thread steel that the embodiment of the present invention provides and composite molding technique thereof, described bimetallic screw-thread steel comprises stainless steel layer and carbon steel core, described stainless steel layer is wrapped in the periphery of described carbon steel core, its composite molding technique comprises: stainless-steel pipe blank carbon steel core blank being loaded hollow forms bimetallic blank, and wherein said carbon steel core blank and described stainless-steel pipe blank are interference fit; The described bimetallic blank assembled is rolled processing, form bimetallic screw-thread steel, described bimetallic screw-thread steel comprises carbon steel core and outer stainless steel layer, and the combination interface of described stainless steel layer and described carbon steel core is because of the interference fit had in above-mentioned moulding process, high-temperature heating and draught pressure effect, can be formed as the metallurgical bonding interface that bond strength is high, processing performance is excellent.The present invention adopts the bimetallic screw-thread steel of carbon steel core and outer stainless steel layer structure to carry out alternative stainless steel screw-thread steel of the prior art, under the prerequisite ensureing screw-thread steel anticorrosion properties, can also save stainless steel material, greatly reduce engineering cost; Meanwhile, compare common stainless steel screw-thread steel, bimetallic screw-thread steel of the present invention effectively can improve intensity.In sum, described bimetallic screw-thread steel provided by the invention has broad application prospects in the waterside such as bridge, coast defence engineering, underwater concrete.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, for those of ordinary skills, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The perspective view of a kind of stainless steel/carbon bimetallic screw-thread steel that Fig. 1 provides for the embodiment of the present invention;
The cross-sectional view of a kind of stainless steel/carbon bimetallic screw-thread steel that Fig. 2 provides for the embodiment of the present invention;
The surface texture schematic diagram of a kind of stainless steel/carbon bimetallic material base that Fig. 3 provides for the embodiment of the present invention;
The axial section structural representation of a kind of bimetallic material base that Fig. 4 provides for the embodiment of the present invention;
The horizontal section structural representation of a kind of bimetallic material base that Fig. 5 provides for the embodiment of the present invention;
The horizontal section structural representation of the another kind of bimetallic material base that Fig. 6 provides for the embodiment of the present invention;
In Fig. 1-6, concrete symbol is:
1-stainless steel layer, 2-carbon steel core, 3-crossrib structure, 4-stainless-steel pipe blank, 5-carbon steel core blank.
Detailed description of the invention
Technical scheme in the present invention is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
See Fig. 1, be the basic structure schematic diagram of a kind of bimetallic screw-thread steel that the embodiment of the present invention provides, comprise stainless steel layer 1 and carbon steel core 2.
Described stainless steel layer 1 is wrapped in the periphery of described carbon steel core 2, the inwall of described stainless steel layer 1 and the outer wall of described carbon steel core 2 are combined closely, and the combination interface of described stainless steel layer 1 and described carbon steel core 2 is metallurgical bonding interface, meanwhile, the periphery of described stainless steel layer 1 and described carbon steel core 2 is one-body molded crossrib structure 3.
The combination interface of stainless steel layer 1 described in the present embodiment and described carbon steel core 2 is the metallurgical bonding interface formed after heating and continuously hot rolling, this metallurgical bonding interface be described stainless steel layer 1 and described carbon steel core 2 interface between the counterdiffusion of atom phase and the combination formed, its bond strength and structural stability are that mechanical bond can not be compared, and have good processing performance.
Further, described stainless steel layer 1 is arranged on the skin of described bimetallic screw-thread steel, make use of the corrosion resistance of stainless steel material fully; Simultaneously, described carbon steel core 2 is enclosed with in described stainless steel layer 1, carbon steel due to phosphorus content high, relative to stainless steel, there is high strength and firmness level, effectively can improve the intensity of described bimetallic screw-thread steel accordingly, and the cost ratio stainless steel of carbon steel is low, the described bimetallic screw-thread steel that described the present embodiment provides, compared with existing stainless steel screw-thread steel, also reduces material cost while raising screw-thread steel intensity.
The cost of raw material is reduced as much as possible in order to the anticorrosion object reaching described bimetallic screw-thread steel has simultaneously, in the present embodiment, the weight of described stainless steel layer 1 is the 8%-30% of described bimetallic screw-thread steel gross weight, its thickness is the 5%-18% of described bimetallic screw-thread steel diameter, such as, for the bimetallic screw-thread steel that diameter is 25mm, the thickness of described stainless steel layer 1 is designed to 0.83mm, but is not limited to above-mentioned number range.
Stainless steel can be divided into Cr system (400 series), Cr-Ni system (300 series), Cr-Mn-Ni system (200 series) and precipitation hardening (600 series) etc. by composition, Cr-Ni series austenitic stainless steel antiseptic effect is wherein best, therefore, the Cr-Ni series austenitic stainless steel that adopts antiseptic property good of stainless steel layer 1 described in the present embodiment.
Further, in Cr-Ni series austenitic stainless steel, 304 stainless steels are a kind of stainless steels be most widely used, and have good corrosion resistance, heat resistance; 316 stainless steels are after 304 stainless steels, second steel grade obtaining most extensive use, adding molybdenum element makes it obtain a kind of erosion-resisting special construction, and compared with 304 stainless steels, it has better resisting chlorides corrosive power, and therefore described stainless steel 2 preferably adopts 304 stainless steels or 316 stainless steels.For the not high applied environment of requirement for anticorrosion, also can adopt Cr-Mn-Ni system stainless steel, certainly also select other to have the stainless steel of decay resistance.
Described carbon steel core 2 material can be selected and produce HRB335 screw-thread steel, HRB400 screw-thread steel or HRB500 screw-thread steel base material used at present, but is not limited to above-mentioned three kinds of materials.
Further, the periphery of described stainless steel layer 1 and described carbon steel core 2 is one-body molded crossrib structure 3, and described crossrib structure 3 is included in the twice that bimetallic screw-thread steel surface rolling formed and indulges rib and equally distributed cross rib along its length.
The embodiment of the present invention additionally provides bimetallic screw-thread steel composite molding technique, specifically comprises the following steps:
S101: the stainless-steel pipe blank 4 carbon steel core blank 5 being loaded hollow forms bimetallic blank, wherein said carbon steel core blank 5 and described stainless-steel pipe blank 4 are interference fit.
Select carbon steel core blank 5 and the stainless-steel pipe blank 4 of suitable types, in type of raw materials selection, described carbon steel core blank 5 can select current carbon steel screw-thread steel to produce HRB335, HRB400 or HRB500 used, and described stainless-steel pipe blank 4 can select Cr-Ni series austenitic stainless steel or the Cr-Mn-Ni series austenitic stainless steel of favorable anti-corrosion effect, in stock material shapes selection, the inner diameter shape of described stainless-steel pipe blank 4 can be the shape such as circular, square, and the outer diameter shape of corresponding described carbon steel core blank 5 is also the shape such as circular, square, in raw material size Selection, because stainless steel is the firm fine and closely woven stable rich chromium oxide film of one deck formed by its surface, prevent the continuation of oxygen atom from infiltrating, continue oxidation, and obtain corrosion protection ability, so have certain thickness requirement to the outer stainless steel layer in bimetallic screw-thread steel, but consider the high strength and the engineering cost that ensure bimetallic screw-thread steel simultaneously, preferably, the wall thickness of described stainless-steel pipe blank 4 is the 5%-18% of described bimetallic billet size, the weight of described stainless-steel pipe blank 4 is the 8%-30% of described bimetallic blank gross weight.
In related standards, the surface quality of double thread steel has made regulation, require that must not there be crack on surface, must not exist and use upper harmful defect etc., so in order to improve end product quality, described stainless-steel pipe blank 4 adopts stainless-steel seamless pipe, can effectively prevent described stainless-steel pipe blank 4 surface in the follow-up operation of rolling from producing crack like this.
Combine closely to make the inwall of the outer wall energy of described carbon steel core blank 5 and described stainless-steel pipe blank 4, described carbon steel core blank 5 and described stainless-steel pipe blank 4 are interference fit, consider that internal stress that maximum interference amount produces does not allow to exceed above-mentioned type of raw materials selected in the restriction of yield strength and the present embodiment, the magnitude of interference of described carbon steel core blank 5 and described stainless-steel pipe blank 4 is 0-0.1mm.
Consider between described carbon steel core blank 5 and described stainless-steel pipe blank 4 to be slight interference cooperation, in the present embodiment, adopt forcing press plunging or cold charge to be loaded in described stainless-steel pipe blank 4 by described carbon steel core blank 5.Wherein, forcing press plunging is adopted to be to adopt hydraulic press to fill. specifically comprise, first according to the factor such as the magnitude of interference and length of fit, theoretical pressing-in force is calculated, the pressure that setting hydraulic press produces is theoretical pressing-in force 1.5-2 times, is then assembled with described stainless-steel pipe blank 4 by described carbon steel core blank 5 under normal temperature environment.
Finally firm metallurgical bonding interface can be formed in order to described carbon steel core blank 5 and described stainless-steel pipe blank 4 can be made, before described carbon steel core blank 5 is loaded described stainless-steel pipe blank 4, also comprise the step of blank cleaning, with the cleanliness factor of both raisings combination interface, specifically comprise, described carbon steel core blank 5 and described stainless-steel pipe blank 4 are eliminated rust respectively successively, step such as machining cleaning burr and cleaning treatment etc., the inner surface of the outer surface of described carbon steel core blank 5 and described stainless-steel pipe blank 4 is finally made to reach free from admixture, the requirement that non-oxidation and no marking are damaged.Wherein, described cleaning treatment can adopt pickling and acetone to clean the cleaning way combined, the dirts such as the greasy dirt of blank surface, rust staining, weldering spot, oxide layer and free iron are removed by pickling, then the dirts such as the organic matter of blank surface are removed further by acetone cleaning, certainly be not limited to above-mentioned cleaning way, the treatment step such as washed with de-ionized water process or ethanol dehydration process can also be added.
Further, under being in vacuum environment to enable the combination interface of described carbon steel core blank 5 and described stainless-steel pipe blank 4, to guarantee to be formed firmly metallurgical bonding interface, after described carbon steel core blank 5 is loaded described stainless-steel pipe blank 4, also comprise, welded seal is carried out in the position that the outer wall of the both ends of the surface of described bimetallic blank, described carbon steel core blank 5 and the inwall of described stainless-steel pipe blank 4 contact, during concrete enforcement, the blank after assembling must carry out seam under vacuum conditions.
S102: the described bimetallic blank assembled is put into heating furnace and heats.
Be be for machining deformation provides condition on the other hand for the combination interface of described carbon steel core blank 5 and described stainless-steel pipe blank 4 forms smelting alloy combination interface on the one hand to the object of described bimetallic blank heating, therefore, general heating-up temperature is more high better.But temperature is too high can produce again overheated, burning, even occur to melt etc. and add thermal defect; On the other hand, according to the technological requirement to metal working process, it is desirable to remain in certain temperature when intermetallic composite coating is complete, to desirable interior tissue to be obtained and performance.Therefore, in the present embodiment, described bimetallic blank is put into heating-up temperature, the i.e. tapping temperature that heating furnace heats and be set as 1050 DEG C-1280 DEG C, during concrete enforcement, described heating-up temperature can make corresponding change according to factors such as the material of described stainless-steel pipe blank 4 and pipe thicknesses.
S103: the described bimetallic blank after heating is carried out hot rolling, forms bimetallic screw-thread steel.
In concrete enforcement, can comprise the steps:
S201: enter roughing mill when described bimetallic blank temperature drops to suitable temperature, incite somebody to action repeatedly tandem rolling, form the first bimetallic round steel, wherein, roughing number of times can be 4-9 time.
S202: by described first bimetallic round steel through flying shear crop and back-end crop, head and afterbody defect are cut only, wherein, crop length 300mm-350mm, back-end crop length 350mm-500mm, but be not limited to this number range.
S203: the described first bimetallic round steel after shearing is entered middle milling train tandem rolling and becomes the second bimetallic round steel, wherein, in roll number of times can be 4-9 time.
S204: described second bimetallic round steel is entered finishing mill and carries out pre-finish rolling and secondary finish rolling rolling successively, forms bimetallic screw-thread steel.
Wherein, between described pre-finish rolling and described secondary finish rolling, also comprise the process of water-cooled.Certainly, be not limited to above-mentioned hot-rolled step, specific implementation process can also change according to demand.
After forming described bimetallic screw-thread steel, through cooling, to collect and after the work step such as size required for hot-metal sawing machine sawing becomes, then through inspection, bundling and wash away the work steps such as the stainless screw-thread steel oxide on surface of dual phase steel, packaging of just can weighing warehouse-in.
In above-mentioned hot rolling technology, described carbon steel core blank 5 and described stainless-steel pipe blank 4 diffusion layer that contact interface place is formed under high temperature, condition of high voltage, can realize the good metallurgical binding of described carbon steel core blank 5 and described stainless-steel pipe blank 4 contact interface place.
Certainly, cold-rolling process also can be adopted to be rolled processing to described bimetallic blank, can to comprise the steps:
S301: use cold-rolling mill that described bimetallic blank is rolled into bimetallic screw-thread steel.
S302: double tempering is carried out to the described bimetallic screw-thread steel of roll forming, dispels the carbon that it is unnecessary, increase its density, thus improve its percentage elongation, tensile strength.
In order to make those skilled in the art person understand technical scheme in the present invention better, below in conjunction with concrete enforcement the present invention being done and further illustrating.
Embodiment one
The present embodiment will adopt 304 stainless steels and HRB335 steel billet material, is finally rolled into the bimetallic screw-thread steel that diameter is Φ 25mm.
As shown in Figure 4 and Figure 5, the basic structure schematic diagram of a kind of bimetallic material base provided for the embodiment of the present invention.
The stainless-steel pipe blank 4 of the present embodiment ectomesoderm adopts 304 stainless steels, and described stainless-steel pipe blank 4 is round seamless steel pipe, and it is specifically of a size of Φ 150 × 5 × 2000 (external diameter × wall thickness × length, mm).The carbon steel core blank 5 of core adopts produces HRB400 screw-thread steel blank used, and it is specifically of a size of Φ 140.07 × 2000 (external diameter × length, mm), and the magnitude of interference between described carbon steel core blank 5 and described stainless-steel pipe blank 4 is 0.07mm.
By the burr of described stainless-steel pipe blank 4 first place to go inner surface, then carry out pickling processes, finally use acetone cleaning treatment again.Core blank is carried out the size that turnery processing to described carbon steel core blank 5 requires, and then carry out surface cleaning processing.
Subzero treatment is carried out to described carbon steel core blank 5, preferably, liquid nitrogen selected by refrigerant for freezing described carbon steel core blank 5, then described carbon steel core blank 5 is loaded described stainless-steel pipe blank 4, form 304/HRB400 bimetallic blank, described 304/HRB400 bimetallic blank gross weight is 278.37 kilograms, and the weight of wherein said stainless-steel pipe blank 4 is 36.44 kilograms, accounts for 13.09% of described 304/HRB400 bimetallic blank gross weight.
Described 304/HRB400 bimetallic blank is carried out welded seal to the position that the outer wall of both ends of the surface, described carbon steel core blank 5 and the inwall of described stainless-steel pipe blank 4 contact under vacuum conditions.
Described 304/HRB400 bimetallic blank is put into heating furnace heat, tapping temperature controls at 1260 DEG C.
Carry out hot rolling after heating completely, be rolled into the bimetallic screw-thread steel that diameter is Φ 25mm, wherein the thickness of stainless steel layer is 0.83mm.
Embodiment two
The present embodiment will adopt 316L stainless steel and produce the blank of HRB500 screw-thread steel, is finally rolled into the bimetallic screw-thread steel that diameter is Φ 28mm.
As shown in Figure 6, the basic structure schematic diagram of the another kind of bimetallic material base provided for the embodiment of the present invention.
The stainless-steel pipe blank 4 of the present embodiment ectomesoderm adopts 316L stainless steel, and described stainless-steel pipe blank 4 is equilateral rectangle seamless steel pipe, and it is specifically of a size of 160 × 5 × 3000 (length of side × wall thickness × length, mm).The carbon steel core blank 5 of core adopts produces HRB500 screw-thread steel blank used, and it is specifically of a size of 150.5 × 3000 (length of side × length, mm), and the magnitude of interference between described carbon steel core blank 5 and described stainless-steel pipe blank 4 is 0.5mm.
By the burr of described stainless-steel pipe blank 4 first place to go inner surface, then carry out pickling processes, finally use acetone cleaning treatment again.Core blank is carried out the size that turnery processing to described carbon steel core blank 5 requires, and then carry out surface cleaning processing.
Adopt hydraulic press, under normal temperature environment, described carbon steel core blank 5 is assembled with described stainless-steel pipe blank 4, form 316L/HRB500 bimetallic blank, described 316L/HRB500 bimetallic blank gross weight is 604.82 kilograms, the weight of wherein said stainless-steel pipe blank 4 is 74.4 kilograms, accounts for 12.3% of described 316L/HRB500 bimetallic blank gross weight.After assembling, welded seal is carried out in the position that the inwall of the both ends of the surface of described 316L/HRB500 bimetallic blank, the outer wall of described carbon steel core blank 5 and described stainless-steel pipe blank 4 contacts.
Described 316L/HRB500 bimetallic blank is put into heating furnace, and tapping temperature controls at 1280 DEG C.
Carry out rolling hot-rolling after heating, be rolled into the bimetallic screw-thread steel that diameter is Φ 28mm, wherein the thickness of stainless steel layer is 0.875mm.
It should be noted that, in this article, the such as relational terms of " first " and " second " etc. and so on is only used for an entity or operation to separate with another entity or operating space, and not necessarily requires or imply the relation that there is any this reality between these entities or operation or sequentially.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thus make to comprise the process of a series of key element, method, article or equipment and not only comprise those key elements, but also comprise other key elements clearly do not listed, or also comprise by the intrinsic key element of this process, method, article or equipment.When not more restrictions, the key element limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment comprising described key element and also there is other identical element.
The above is only the specific embodiment of the present invention, those skilled in the art is understood or realizes the present invention.To be apparent to one skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (14)
1. a stainless steel/carbon bimetallic screw-thread steel, is characterized in that, comprises stainless steel layer (1) and carbon steel core (2), wherein:
Described stainless steel layer (1) is wrapped in the periphery of described carbon steel core (2), the inwall of described stainless steel layer (1) and the outer wall of described carbon steel core (2) are combined closely, and the combination interface of described stainless steel layer (1) and described carbon steel core (2) is metallurgical bonding interface;
The periphery of described stainless steel layer (1) and described carbon steel core (2) is one-body molded crossrib structure (3).
2. stainless steel/carbon bimetallic screw-thread steel according to claim 1, is characterized in that, the weight of described stainless steel layer (1) is the 8%-30% of described bimetallic screw-thread steel gross weight.
3. stainless steel/carbon bimetallic screw-thread steel according to claim 1 and 2, is characterized in that, the thickness of described stainless steel layer (1) is the 5%-18% of described bimetallic screw-thread steel diameter.
4. stainless steel/carbon bimetallic screw-thread steel according to claim 1 and 2, is characterized in that, described stainless steel layer (1) comprises Cr-Ni series austenitic stainless steel or Cr-Mn-Ni series austenitic stainless steel.
5. stainless steel/carbon bimetallic screw-thread steel according to claim 1 and 2, is characterized in that, described carbon steel core (2) comprises HRB335 steel core, HRB400 steel core or HRB500 steel core.
6. a stainless steel/carbon bimetallic screw-thread steel composite molding technique, is characterized in that, comprise the following steps:
The stainless-steel pipe blank (4) carbon steel core blank (5) being loaded hollow forms bimetallic blank, and wherein said carbon steel core blank (5) and described stainless-steel pipe blank (4) are interference fit;
The described bimetallic blank assembled is put into heating furnace heat;
Described bimetallic blank after heating is carried out hot rolling, forms bimetallic screw-thread steel.
7. stainless steel/carbon bimetallic screw-thread steel composite molding technique according to claim 6, is characterized in that, before carbon steel core blank (5) being loaded stainless-steel pipe blank (4) the formation bimetallic blank of hollow, also comprises:
Described carbon steel core blank (5) and described stainless-steel pipe blank (4) are carried out eliminating rust, clearing up burr and cleaning treatment respectively successively.
8. stainless steel/carbon bimetallic screw-thread steel composite molding technique according to claim 7, it is characterized in that, described cleaning treatment comprises pickling processes and acetone cleaning treatment.
9. stainless steel/carbon bimetallic screw-thread steel composite molding technique according to claim 6, is characterized in that, the stainless-steel pipe blank (4) carbon steel core blank (5) being loaded hollow forms bimetallic blank, also comprises:
Welded seal is carried out in the position of the outer wall of the two ends end face of described bimetallic blank, described carbon steel core blank (5) and the contact internal walls of described stainless-steel pipe blank (4).
10. according to the arbitrary described stainless steel/carbon bimetallic screw-thread steel composite molding technique of claim 6-9, it is characterized in that, the method that described carbon steel core blank (5) loads described stainless-steel pipe blank (4) is comprised forcing press plunging or cold charge.
11. according to the arbitrary described stainless steel/carbon bimetallic screw-thread steel composite molding technique of claim 6-9, it is characterized in that, the magnitude of interference of described carbon steel core blank (5) and described stainless-steel pipe blank (4) interference fit is 0-0.1mm.
12., according to the arbitrary described stainless steel/carbon bimetallic screw-thread steel composite molding technique of claim 6-9, is characterized in that, after the described bimetallic blank assembled being put into heating furnace heating, tapping temperature is 1050 DEG C-1280 DEG C.
13. according to the arbitrary described stainless steel/carbon bimetallic screw-thread steel composite molding technique of claim 6-9, and it is characterized in that, described stainless-steel pipe blank (4) is stainless-steel seamless pipe.
14. according to the arbitrary described stainless steel/carbon bimetallic screw-thread steel composite molding technique of claim 6-9, it is characterized in that, the internal diameter of described stainless-steel pipe blank (4) and the shape of described carbon steel core blank (5) external diameter comprise circular or square.
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| CN105839854A (en) * | 2016-05-03 | 2016-08-10 | 陈志明 | Stainless steel cladding ribbed bar and round steel |
| CN107900625A (en) * | 2017-12-07 | 2018-04-13 | 太原钢铁(集团)有限公司 | The compound spiral of carbon steel stainless steel and its manufacture method |
| CN107933013A (en) * | 2017-11-10 | 2018-04-20 | 东北大学 | A kind of stainless steel/carbon vacuum composite reinforcing steel bar and its manufacturing process |
| CN110449483A (en) * | 2019-07-05 | 2019-11-15 | 法尔胜泓昇集团有限公司 | A kind of composite filament preparation method of stainless steel cladding steel wire |
| CN112203787A (en) * | 2018-05-28 | 2021-01-08 | 达玛斯蒂尔股份公司 | Blank for Damascus pattern product |
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| CN113210419A (en) * | 2021-05-08 | 2021-08-06 | 湖南三泰新材料股份有限公司 | Corrosion-resistant HRB600E composite anti-seismic steel bar and manufacturing method thereof |
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