NL2032609B1 - Preparation method of x80 grade steel plate hot extrusion elbow - Google Patents
Preparation method of x80 grade steel plate hot extrusion elbow Download PDFInfo
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- NL2032609B1 NL2032609B1 NL2032609A NL2032609A NL2032609B1 NL 2032609 B1 NL2032609 B1 NL 2032609B1 NL 2032609 A NL2032609 A NL 2032609A NL 2032609 A NL2032609 A NL 2032609A NL 2032609 B1 NL2032609 B1 NL 2032609B1
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- Prior art keywords
- elbow
- hot extrusion
- preparing
- pipe head
- steel plate
- Prior art date
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 46
- 239000010959 steel Substances 0.000 title claims abstract description 46
- 238000001192 hot extrusion Methods 0.000 title claims abstract description 18
- 238000002360 preparation method Methods 0.000 title claims abstract description 10
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000003466 welding Methods 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 6
- 238000013461 design Methods 0.000 claims abstract description 4
- 238000009966 trimming Methods 0.000 claims abstract description 4
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 20
- 239000011701 zinc Substances 0.000 claims description 19
- 229910052725 zinc Inorganic materials 0.000 claims description 19
- 239000003973 paint Substances 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 10
- 238000007493 shaping process Methods 0.000 claims description 10
- 238000005507 spraying Methods 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000007669 thermal treatment Methods 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 6
- 230000007547 defect Effects 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 3
- 238000007731 hot pressing Methods 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000002203 pretreatment Methods 0.000 claims description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 claims 2
- 238000005282 brightening Methods 0.000 claims 1
- 230000002950 deficient Effects 0.000 claims 1
- 238000009499 grossing Methods 0.000 claims 1
- 239000002994 raw material Substances 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000005096 rolling process Methods 0.000 description 13
- 238000005452 bending Methods 0.000 description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 239000004593 Epoxy Substances 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000001953 recrystallisation Methods 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000012937 correction Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002845 discoloration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000013556 antirust agent Substances 0.000 description 1
- 229910001563 bainite Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003818 cinder Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000010422 painting Methods 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/005—Modifying the physical properties by deformation combined with, or followed by, heat treatment of ferrous alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
- B21C37/15—Making tubes of special shape; Making tube fittings
- B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
- B21C37/283—Making U-pieces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/10—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
-
- 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
-
- 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
- F16L43/00—Bends; Siphons
- F16L43/001—Bends; Siphons made of metal
-
- 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
- F16L9/02—Rigid pipes of metal
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/04—Tubular or hollow articles
- B23K2101/06—Tubes
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
- C21D9/085—Cooling or quenching
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Shaping Metal By Deep-Drawing, Or The Like (AREA)
Abstract
Disclosed is a preparation method of an X80 grade steel plate hot extrusion elbow, including the following steps: 8100: preparing an X80 grade steel plate; 8200: blanking the X80 grade steel plate to obtain the treated steel plate; 8300: hot-press forming: selecting an appropriate mould according to demands, clamping the treated X80 grade steel plate on a frame of a forming machine to be heated and softened in a high-elasticity state and at an appropriate temperature, enabling the sheet or plate to be heated and extended at the same time, cutting and trimming to obtain a blank meeting the design requirement; 8400: flattening the blank; 8500: welding the flattened blank to obtain a first pipe head; and 8600: treating the first pipe head to obtain a finished product. By the method, the quality of the pipe head and the production efficiency can be effectively improved.
Description
PREPARATION METHOD OF X80 GRADE STEEL PLATE HOT EXTRUSION ELBOW
The present invention belongs to the technical field of elbow processing, and in particular, relates to a preparation method of an X80 grade steel plate hot extrusion elbow.
The structure of a pipeline connecting elbow is generally divided into a welding elbow and a forming elbow, where the welding elbow is generally formed by cutting a straight pipe material into inclined surface short sections according to the included angle of the elbow and then butting and welding two or a plurality of short sections, while the forming elbow is generally formed by pressing a straight pipe or a straight pipe short section on a press or is formed by mechanically bending the straight pipe or straight pipe short section on a pipe-bending machine and then cutting two ends. Traditional elbows are mostly made by single-piece pressure bending forming. The reason why single-piece pressure bending forming is adopted is mainly due to the plasticity of the elbow material. Local deformation often occurs in the pressure bending forming process, so after pressure forming, it is generally necessary to shape the inside of the elbow. Furthermore, the current shaping method is to stuff a steel ball that is slightly less than an inner diameter of the elbow into a bend and then use a mandril to slowly push the steel ball from one end of the bend to the other end. According to the method, the shaping speed is extremely low, and most importantly, a plurality of bending multi-connected elbows cannot be pressed and formed at one time. Therefore, by the bending forming process, the production efficiency is low, and the quality is difficult to be ensured reliably.
An objective of the present invention is to provide a preparation method of an X80 grade steel plate hot extrusion elbow, so as to solve the problems in the prior art.
To achieve the above objective, the present invention provides a preparation method of an
X80 grade steel plate hot extrusion elbow. The preparation method includes the following steps:
S100: preparing an X80 grade steel plate;
S200: blanking the X80 grade steel plate to obtain the treated steel plate;
S300: hot-press forming: selecting an appropriate mould according to demands, clamping the treated X80 grade steel plate on a frame of a forming machine to be heated and softened in a high-elasticity state and at an appropriate temperature, enabling the sheet or plate to be heated and extended at the same time, then making the sheet or plate cling to a mould profile by means of applied pressure to obtain a shape similar to the profile, and cooling, shaping, cutting and trimming to obtain a blank meeting the design requirement;
S400: flattening the blank;
S500: welding the flattened blank to obtain a first pipe head; and
S600: treating the first pipe head to obtain a finished product.
Optionally, the final cooling temperature of cooling in the S300 is controlled not to be higher than 350°C, followed by temperature correction.
Optionally, the heating temperature in the hot pressing process in the S300 is unable to exceed 930°C, and the blank charging temperature is below 600°C.
Optionally, during welding in the S500, the chemical components and mechanical property of a welding rod are consistent with those of a base material; and it is determined through a simulation test that the heating temperature and the interlayer temperature of the base material do not exceed 200°C, the current is between 160 A and 190 A, the voltage is 30 V, and the welding speed is controlled to be 15-18 cm/min.
Optionally, the S600 comprises: performing thermal treatment on the first pipe head to obtain a second pipe head; and pre-treating the second pipe head to obtain a third pipe head, wherein the pre-treatment comprises: a shaping process, a sand-blasting and descaling process, inspection and groove processing.
Optionally, the third pipe head is detected to determine whether the third pipe head is a finished product.
Optionally, detecting the finished product comprises: detecting whether the appearance and geometric dimension of the third pipe head meets the client's requirement; performing grinding and smooth transition on the pit defect of the surface, and determining that a depth of the third pipe head is not less than the base material by 1 mm and the wall thickness at the defect part is not less than the minimum wall thickness of the elbow; and inspecting the geometric dimension, and the wall thickness of two ports and inner and outer arcs according to the drawing.
Optionally, the S600 further comprises: spray-coating the second pipe head with an inorganic zinc-enriched primer.
Optionally, the spray-coated elbow is subjected to ventilation and paint film curing through hot air blown by a fan with a heating net.
Optionally, watering is performed after completing the construction of the inorganic zinc- enriched primer, it is necessary to water 1 to 2 hours after the construction of the inorganic zinc- enriched primer, with the watering frequency based on keeping the paint film wet.
The present invention has the following technical effects: the present invention discloses a preparation method of an X80 grade steel plate hot extrusion elbow. By the method, the quality and the production efficiency of the pipe head can be effectively improved.
It should be noted that features in the embodiments and the embodiments in the application may be combined with each other without conflict. The application will be described below in details with reference to the accompanying drawings and embodiments.
Embodiment 1
As shown in FIG. 1, this embodiment provides a preparation method of an X80 grade steel plate hot extrusion elbow, including:
S100: an X80 grade steel plate is selected, where the X80 grade steel plate needs to meet the following requirements: 1) the carbon equivalent CEpc is less than or equal to 0.23%, the C content is 0.01% to 0.30%, the Mn content is 1.5% to 0.25%, the Si content is 0.20% to 0.25%, the Cr content is 0.13%, the Mo content is 0.25%, the V content is 0.035%, the Ni content is 0.04% to 1%, the Nb content is 0.06%, the Cu content is 0.15%, the AL content is less than or equal to 0.045%, and
N is less than or equal to 0.0046%, where Al mainly plays a role in nitrogen fixation and deoxidation, and AIN formed by bonding Al and N may effectively refine the crystal grain, but the excessive content will damage the toughness of steel and deteriorate the hot workability.
Therefore, it is necessary to control the content of the steel plate selected in the present invention to be within 0.045%, preferably, 0.02% to 0.045%. A low-carbon bainite structure with a grain size controlled at grade 11 and above is dominated. 2) Initial steel plate: a continuous casting blank with the chemical components conform to the chemical components of the steel plate is cast, the continuous casting blank is heated to 1150°C to 1180°C and subjected to temperature preservation for 3-4 hours. 3) The initial steel plate also required two-stage rolling after descaling by high-pressure water: the first stage is to roll in a recrystallization area, the initial rolling temperature is 1130°C to 1180°C, the final rolling temperature is 1030°C to 1080°C after multi-pass rolling, and the two-pass deformation rate is controlled to be greater than or equal to 25%; and the second stage is to roll in a non-recrystallization area, the initial rolling temperature is 830°C to 900°C, the final rolling temperature is 750°C to 840°C, and an accumulated deformation rate of rolling in the non-recrystallization area is greater than or equal to 80%. 4) After rolling, it is also necessary to cool the steel plate, including: the final rolling real-time temperature of the second stage of the steel plate is acquired; the final rolling real-time temperature of the second stageis corrected according to the corresponding relationship between the thickness of the steel plate and the temperature of the steel plate; the opening number and position of cooling manifolds in a laminar cooling device are calculated according to the corrected final rolling real-time temperature; and the corresponding cooling manifolds are enabled according to the calculated opening number and position of the cooling manifolds, the steel plate is cooled, and the final rolling temperature is an input parameter of a water cooling model; the final rolling temperatures of the steel plates with different thickness are corrected to make a pre-calculation result of a water cooling model closer to an on-line calculation result, thereby making the final cooling temperature output by the water cooling model is more accurate.
According to the selection of the opening number and position of the cooling manifolds in the laminar cooling device, the cooling uniformity of the steel plate can be improved, thereby improving the plate shape. The technical problems of excessive deviation of the final cooling temperature of the water-cooled steel plate and deflection of the plate shape are solved, and the technical effect of the quality of the steel plate is improved.
The final cooling temperature of cooling is not higher than 350°C, followed by temperature correction, and finally the steel plate is air-cooled to a room temperature to obtain pipeline steel plate capable of resisting seawater corrosion and large deformation.
S200: The X80 grade steel plate is blanked to obtain the treated steel plate.
S300: Hot-press forming: an appropriate mould is selected according to requirements, the treated X80 grade steel plate is clamped on a frame of a forming machine to be heated and softened in a high-elasticity state and at an appropriate temperature, the sheet or plate is heated and extended at the same time, then the sheet or plate clings to a mould profile to obtain a shape similar to the profile, and cooling, shaping, cutting and trimming are performed to obtain a blank meeting the design requirement.
Specifically, the heating temperature in the hot pressing process cannot exceed 930°C, and the blank charging temperature is below 600°C.
S400: The blank is flattened.
S500: The flattened blank is welded: an appropriate welding rod is selected, where the chemical components and the mechanical property of the welding rod are equal to or slightly higher than those of a base material; and the heating temperature of the base material is determined according to a simulation test, appropriate current and voltage are selected, the interlayer temperature does not exceed 200°C, the current is between 160 A and 190 A, the voltage is 30 V, and the welding speed is controlled to be 15-18 cm/min.
S600: Thermal treatment is performed, the placing positions of a plurality of pieces are controlled when the plurality of pieces are treated in the same furnace, and welding lines are located on the same heated layer; the elbow after hot processing requires normalizing thermal treatment so as to eliminate stress and refine the grain size; and the normalizing temperature is 900°C to 930°C, the temperature-preserving time is 20 min, and natural cooling is performed after discharging.
S700: The elbow after thermal treatment is pre-treated, including:
a shaping process: as the crystal lattice of the elbow is changed due to thermal treatment, which eliminates an internal stress caused by processing and causes the change of geometric dimensions such as ellipticity, it is necessary to use a shaping mould to perform bending degree shaping and ellipticity shaping; 5 a sand-blasting and descaling process: inner and outer surfaces of the elbow are subjected to sand-blasting treatment, and scale cinder sundries are washed away; inspection: non-destructive inspection is performed, and MT is performed according to
JB4730, where | grade is qualified; and groove processing: the grooves of two ends of the elbow are turned by a chamfering machine according to the requirements of the drawing.
S800: The finished product is detected, specifically including: appearance and geometric dimension are detected; the pit defect of the surface is subjected to grinding and smooth transition, with a depth not less than the base material by 1 mm, and a wall thickness at the defect part not less than the minimum wall thickness of the elbow; and the geometric dimension, and the wall thickness of two ports and inner and outer arcs are inspected according to the drawing; each item of detection is recorded in detail, the detection results are summarized and filled in the inspection and detection sheet of finished products, and the inspection and detection sheets of the finished products and the warranty are distributed to users and the quality guarantee department of the factor for archiving; and surface treatment, identification and packaging: the outer surface is subjected to rust- preventing treatment, painting is performed according to the product requirement, an antirust agent is sprayed an the groove; and the elbow is placed flatly, is subjected to product identification in the middle part, and then is classified and packaged as required.
Embodiment 2
Different from Embodiment 1, treatment on the elbow after thermal treatment further includes: the inorganic zinc-enriched primer is prepared, and the inorganic zinc-enriched primer is filtered by a filter screen to remove agglomerated substances and sundries so as to prevent the agglomerated substances and sundries from blocking a pipe head during spray coating.
The inorganic zinc-enriched primer is put into a high-pressure tank body, and a stirring device in the high-pressure tank body is started at the same time to continuously stir and mix the inorganic zinc-enriched primer inside the high-pressure tank body. Furthermore, stirring is performed continuously while spray coating is performed to prevent zinc powder from precipitating. The elbow needs to be fixedly mounted on a fixing device before spray coating to facilitate spray-coating construction.
Optionally, the spray-coated elbow is subjected to ventilation and paint film curing through hot air blown by a fan with a heating net. When the relative humidity is less than 65%, the inorganic zinc-enriched primer is cured particularly slowly, so it is necessary to perform spray coating to increase the curing speed, thereby shortening the re-coating time of the subsequent coating.
Optionally, watering includes: a. The watering needs to be performed 1 to 2 hours after the construction of the inorganic zinc-enriched primer. Specifically, the relative humidity of the environment after completing the construction of the inorganic zinc-enriched primer greatly affects the curing of the inorganic zinc-enriched primer. If the humidity is less than 65%, a method for sprinkling the surface of inorganic zinc should be adopted to increase the surface humidity of the inorganic zinc and accelerate curing thereof. Watering may be performed 1 to 2 hours after the construction of the inorganic zinc, and the surface of the inorganic zinc needs to keep wet all the time during curing until complete curing.
B. The water frequency is based on keeping the paint film wet. Specifically, when the temperature and humidity are low, the curing speed may be increased by increasing the water times, thereby reducing the double influence caused by low temperature and low humidity.
Generally, when the relative humidity is low, the surface of the paint film is required to be kept wet until complete curing. That is, the paint film is ensured to be kept wet all the time until curing.
Optionally, in order to check the curing effect, it is necessary to perform the following processes: the curing integrity of the paint film of the inorganic zinc-enriched primer is detected after the paint film formed by the inorganic zinc-enriched primer is cured. During detection, an
MEK detection method is used, white cotton cloth dipped with an MEK reagent wipes the surface of the elbow back and forth. If there is no or only slight discoloration, it means that the curing has been completed; otherwise, if the discoloration is serious, it means that curing has not been completed.
Optionally, after it is detected that the curing of the inorganic zinc-enriched primer has been completed, the surface layer coated with the inorganic zinc-enriched primer may be spray- coated with the prepared epoxy seal for twice, and then epoxy seal is ventilated, dried and cured.
Optionally, after the epoxy seal is cured, a thick slurry type epoxy micaceous iron oxide intermediate paint is spray-coated by a spray-coating apparatus, acrylic polyurethane finish paint is spray-coated by the spray-coating device after ventilation and curing of the spray- coated paint, and ventilation and curing are performed.
The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily conceive modifications or replacements within the technical scope of the present application, and these modifications or replacements shall fall within the protection scope of the present application.
Therefore, the protection scope of the present application It should be subject to the protection scope of the claims.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2032609A NL2032609B1 (en) | 2022-07-27 | 2022-07-27 | Preparation method of x80 grade steel plate hot extrusion elbow |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL2032609A NL2032609B1 (en) | 2022-07-27 | 2022-07-27 | Preparation method of x80 grade steel plate hot extrusion elbow |
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| Publication Number | Publication Date |
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| NL2032609B1 true NL2032609B1 (en) | 2024-02-05 |
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| NL2032609A NL2032609B1 (en) | 2022-07-27 | 2022-07-27 | Preparation method of x80 grade steel plate hot extrusion elbow |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2147986A1 (en) * | 2007-05-16 | 2010-01-27 | Sumitomo Metal Industries, Ltd. | Bend pipe and process for manufacturing the same |
| CN104404378A (en) * | 2014-12-19 | 2015-03-11 | 山东钢铁股份有限公司 | Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate |
| CN108239720A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气集团公司 | A kind of X80 steel, X80 steel plates and its preparation method of threeway |
| CN108588348A (en) * | 2018-04-23 | 2018-09-28 | 西南石油大学 | A kind of high-strength steel heating bend manufacturing method and system |
| CN109465610A (en) * | 2019-01-10 | 2019-03-15 | 河北宇鹏重工科技有限公司 | A kind of technique using the manufacture low temperature molding threeway of X80 steel plate |
| CN111013985A (en) * | 2019-11-28 | 2020-04-17 | 衡阳科盈钢管有限公司 | Novel elbow corrosion prevention process |
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2022
- 2022-07-27 NL NL2032609A patent/NL2032609B1/en active
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| EP2147986A1 (en) * | 2007-05-16 | 2010-01-27 | Sumitomo Metal Industries, Ltd. | Bend pipe and process for manufacturing the same |
| CN104404378A (en) * | 2014-12-19 | 2015-03-11 | 山东钢铁股份有限公司 | Wide and thick steel plate for hot-bent elbow pipes at X65-X80 levels and manufacturing method of wide and thick steel plate |
| CN108239720A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气集团公司 | A kind of X80 steel, X80 steel plates and its preparation method of threeway |
| CN108588348A (en) * | 2018-04-23 | 2018-09-28 | 西南石油大学 | A kind of high-strength steel heating bend manufacturing method and system |
| CN109465610A (en) * | 2019-01-10 | 2019-03-15 | 河北宇鹏重工科技有限公司 | A kind of technique using the manufacture low temperature molding threeway of X80 steel plate |
| CN111013985A (en) * | 2019-11-28 | 2020-04-17 | 衡阳科盈钢管有限公司 | Novel elbow corrosion prevention process |
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