CN112108532A - Production process of steel pipe for high-pressure oil pipe - Google Patents
Production process of steel pipe for high-pressure oil pipe Download PDFInfo
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- CN112108532A CN112108532A CN202010927301.4A CN202010927301A CN112108532A CN 112108532 A CN112108532 A CN 112108532A CN 202010927301 A CN202010927301 A CN 202010927301A CN 112108532 A CN112108532 A CN 112108532A
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- steel pipe
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- pressure oil
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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
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 11
- 230000007547 defect Effects 0.000 claims abstract description 17
- 238000005520 cutting process Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000002791 soaking Methods 0.000 claims abstract description 10
- 238000005097 cold rolling Methods 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000004806 packaging method and process Methods 0.000 claims abstract description 4
- 239000003921 oil Substances 0.000 claims description 38
- 238000000034 method Methods 0.000 claims description 15
- 238000005096 rolling process Methods 0.000 claims description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 8
- 238000005406 washing Methods 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 239000013556 antirust agent Substances 0.000 claims description 6
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 4
- 238000000137 annealing Methods 0.000 claims description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 3
- 238000005237 degreasing agent Methods 0.000 claims description 3
- 239000013527 degreasing agent Substances 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 229910052739 hydrogen Inorganic materials 0.000 claims description 3
- 239000001257 hydrogen Substances 0.000 claims description 3
- 230000001050 lubricating effect Effects 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000010731 rolling oil Substances 0.000 claims description 3
- 231100000241 scar Toxicity 0.000 claims description 3
- 238000005554 pickling Methods 0.000 claims description 2
- 238000005498 polishing Methods 0.000 claims description 2
- 208000032544 Cicatrix Diseases 0.000 claims 1
- 238000000643 oven drying Methods 0.000 claims 1
- 230000037387 scars Effects 0.000 claims 1
- 238000007689 inspection Methods 0.000 abstract description 8
- 239000002253 acid Substances 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 230000010485 coping Effects 0.000 abstract 1
- 239000000463 material Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000009661 fatigue test Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 244000137852 Petrea volubilis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 238000000275 quality assurance Methods 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
Images
Classifications
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- 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
-
- 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
- C21D1/26—Methods of annealing
-
- 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
- C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/02—Cleaning or pickling metallic material with solutions or molten salts with acid solutions
- C23G1/08—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G1/00—Cleaning or pickling metallic material with solutions or molten salts
- C23G1/14—Cleaning or pickling metallic material with solutions or molten salts with alkaline solutions
- C23G1/19—Iron or steel
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G3/00—Apparatus for cleaning or pickling metallic material
- C23G3/04—Apparatus for cleaning or pickling metallic material for cleaning pipes
Abstract
The invention discloses a production process of a steel pipe for a high-pressure oil pipe, which comprises the following steps: raw material inspection → acid cleaning → coping → oil coating → cold rolling → cleaning → bright heat treatment → straightening → head and tail cutting → honing → oil soaking → drawing → finished product heat treatment → straightening → head cutting → inspection → packaging and warehousing. The internal hole of the high-pressure oil pipe of the engine produced by the invention can reach the level of P grade, namely under the magnification of 200 times, the number of defects with the depth exceeding 0.01-0.02mm (maximum) on the cross section of each pipe is less than 5.
Description
Technical Field
The invention relates to a high-pressure oil pipe of an engine, in particular to a production process of a steel pipe for the high-pressure oil pipe.
Background
For a diesel engine, there is one high pressure fuel line for each cylinder. As emission standards are upgraded, fuel systems range from mechanical pumps to electronically controlled monoblock pumps and even to high pressure common rail systems, with injection pressures rising to 1600 to 1800bar, and even to 2200 bar. With the increase of injection pressure, new requirements are made on the selection and treatment method of high-pressure oil pipe materials.
Now according to standard ISO 8535-1: the specification of the technical conditions of the first part of the single-wall cold-drawn seamless steel tube for the 2016 compression-ignition engine high-pressure oil tube makes specified requirements and grades on the steel tube in terms of dimensional tolerance and material process. In particular, five levels of S, R, Q, P, O were specified for the quality of the primary lumen surface based on the depth of the defect. Fatigue fracture is the main failure mechanism of high pressure fuel pipe, and the micro-defect of the inner surface of the steel pipe may be expanded when the diesel engine works at high pressure and high frequency. Therefore, the control of the working quality of the inner cavity is a core process for improving the public working pressure of the high-pressure oil pipe for the diesel engine.
At present, the research and development of high-pressure oil pipe materials at home and abroad are mostly explained from the aspects of material design, smelting control, heat treatment control in the process of manufacturing the oil pipe and the like. However, in the process of tubing the oil pipe, the process method for reducing and eliminating the inner wall cracks of the core quality parameters of the high-pressure oil pipe is not deeply researched.
Disclosure of Invention
In order to overcome the defects, the invention provides a production process of a steel pipe for a high-pressure oil pipe, which can control internal cracks in the manufacturing process of the high-pressure oil pipe of an engine, and comprises the following steps:
a. inspecting raw materials;
b. pickling in hydrochloric acid solution with concentration of 20-30% at 25-50 deg.c for 0.5-1 hr → washing with high pressure water → soaking with water soluble antirust agent and stoving;
c. grinding, peeling, removing surface defects, removing 0.3-1mm of single edge, and soaking in drawing and cold rolling oil for more than 2h to form a lubricating layer;
d. cold rolling: before the steel pipe is fed into a rolling mill, the inner hole of the steel pipe is filled with oil, when the oil is filled, one end of the steel pipe is higher and the other end is lower, the oil is filled from the higher end and flows out from the lower end, and the steel pipe is turned over, so that the oil is applied to the periphery of the inner hole of the steel pipe; when a first steel pipe is rolled, a steel pipe with the same specification is used as a guide in the front clamp; when the rolling mill is started, the rolling mill is slowly accelerated from a slow speed, and the rolling mill is strictly prohibited from being directly started at a high speed; during rolling, the rolling speed and the feeding amount of the tube blank need to be mastered, the main motor is generally controlled at 480-520r/min, and the frame reciprocates for 50-60 times/min and 4-6 mm/time;
e. cleaning residual oil on the surface of the steel pipe by using an alkaline degreasing agent → washing by water → drying after dipping by using a water-soluble antirust agent;
f. bright heat treatment: annealing in a bright furnace protected by nitrogen and hydrogen atmosphere at the temperature of 800-900 ℃ for 30 min;
g. straightening → cutting off the head straightening scar and the tail eccentric part → honing;
h. soaking the honed pipe in active drawing oil for 30-60min at 40-70 deg.c;
i. continuously drawing in multiple passes, wherein the elongation of each pass is 1.2-1.4, and performing metallographic inspection on the quality of the inner hole of each pass to ensure that the inner hole crack of the middle pass is below 10 mu m;
j. carrying out heat treatment on a finished product;
k. straightening for the second time and cutting off the head correcting mark and the tail eccentric part after straightening;
and l, inspecting, and packaging qualified products and warehousing.
Preferably, the pressure of the high pressure water in step b is greater than 6 atmospheres.
Preferably, the straightening is performed by a straightening machine in the step g and the step k, and the straightening speed is controlled to be less than 5m/s by a straightening machine with more than 10 rollers in the second straightening in the step k.
Preferably, in the honing step g, the workpiece is rotated and reciprocated by the honing head or rotated by the honing head, so that the machined surface forms crossed helical line cutting and the cutting amount of 0.5mm is ensured on the inner wall.
The invention has the beneficial effects that:
the invention improves each core quality parameter in the process of manufacturing the high-pressure oil pipe, so that the inner hole of the produced high-pressure oil pipe of the engine can reach the P-level.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a photograph of a sample of a single wall cold drawn seamless tubing made in accordance with the present invention taken under an optical microscope at 200 times magnification;
FIG. 2 is a photograph of a single wall cold drawn seamless tubing sample crack made in accordance with the present invention taken at 500 times magnification under an optical microscope;
FIG. 3 is a photograph of a sample crack of a high pressure oil pipe of the same specification not treated by the present invention at 500 times magnification under an optical microscope;
FIG. 4 is a fatigue curve measured at room temperature for a single wall cold drawn seamless tubing made in accordance with the present invention.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
A production process of a steel pipe for a high-pressure oil pipe comprises the following steps:
a. raw material inspection: high-quality low-alloy steel hot-rolled steel pipes are selected as raw materials, manual inspection and eddy current inspection are carried out on the steel pipes according to quality assurance books, and no obvious defects on the inner surface and the outer surface are guaranteed.
b. Acid washing in hydrochloric acid solution of 25-50 deg.c and 20-30% concentration for 0.5-1 hr → high pressure water washing, which must be performed gradually until the inner wall has no scale, dirt and residual acid, and pressure of high pressure water is greater than 6 atm → water soluble antirust agent to prevent steel pipe from rusting and stoving.
In the step b, when the concentration of hydrochloric acid is lower than 20%, or oxide skin and dirt on the surface of a steel pipe or a pipe fitting cannot be washed cleanly by acid, a new solution needs to be prepared; before the steel pipe and the pipe fitting are put into the cylinder, the solution is stirred uniformly, then the steel pipe and the pipe fitting are obliquely put into the cylinder to be soaked in a head-to-tail high mode, the soaking time of the steel pipe and the pipe fitting is different according to different acid liquor concentrations, the steel pipe and the pipe fitting are lifted out in a head-to-tail low mode when lifted, residual floating oil stains and the like on the surface are washed in time by clear water, the surface quality is checked, and no black spots exist on the surface.
c. And (3) selecting a No. 800 grinding wheel to carry out grinding and peeling operation on the raw material steel pipe, removing defects such as surface guide plate marks, warping, microcracks and the like, and removing 0.3-1mm on one side. After polishing, the blank is soaked in drawing and cold rolling oil for more than 2 hours to form a lubricating layer.
d. Cold rolling: before the steel pipe is fed into a rolling mill, the inner hole of the steel pipe is filled with oil, when the oil is filled, one end of the steel pipe is higher and the other end is lower, the oil is filled from the higher end and flows out from the lower end, and the steel pipe is turned over, so that the oil is applied to the periphery of the inner hole of the steel pipe; when a first steel pipe is rolled, a steel pipe with the same specification is used as a guide in the front clamp; when the rolling mill is started, the rolling mill is slowly accelerated from a slow speed, and the rolling mill is strictly prohibited from being directly started at a high speed; during rolling, the rolling speed and the feeding amount of the tube blank need to be mastered, generally, the main motor is controlled at 480-520r/min, and the stand reciprocates 50-60 times/min and 4-6 mm/time.
In the rolling process, the surface quality of the rolled steel pipe is noticed at any time, and the existence of bamboo joints, rolled burrs, rolled folds and lugs is not allowed. And (5) after rolling, checking the surface quality, and evaluating the inner hole defect level through metallographic examination after cold rolling.
e. Cleaning residual oil on the surface of the steel pipe by using an alkaline degreasing agent → washing by water → impregnating by using a water-soluble antirust agent and then drying.
f. Bright heat treatment: annealing in a bright furnace protected by nitrogen and hydrogen atmosphere at the temperature of 800-900 ℃ for 30 min.
g. Straightening → cutting off the straightening scar at the head and the eccentric part at the tail → honing by rotating and reciprocating the honing head or rotating the workpiece to and fro by the honing head to make the machined surface form crossed spiral line cutting. A 0.5mm cut was secured to the inner wall. In the straightening process, if the conditions of fluffing, damage, iron adhesion and the like of the roller surface of the straightening roller are found, the roller surface is polished by sand paper or a grinding wheel in time, and if the straightening quality is affected due to serious defects, the roller is replaced in time.
h. Soaking the honed pipe in active drawing oil for 30-60min at 40-70 deg.c.
i. And (3) continuously drawing in multiple passes, wherein the elongation of each pass is 1.2-1.4, and performing metallographic inspection on the quality of the inner hole of each pass to ensure that the inner hole crack of the middle pass is below 10 mu m.
j. And (3) heat treatment of a finished product: the treatment process is determined according to the standard regulation or the finished product heat treatment state required by a client, and generally comprises the following steps: normalizing, stress relief annealing and quenching and tempering.
k. And (4) straightening for the second time, cutting off the head straightening mark and the tail eccentric part after straightening, wherein a straightening machine with more than 10 rollers is adopted during straightening, and the straightening speed is controlled to be less than 5 m/s.
And l, inspecting, and packaging qualified products and warehousing.
For a diesel injection system produced by the invention and used for a certain unit pump, the specification and the size are as follows: the single-wall cold-drawn seamless oil pipe with the outer diameter of 6.35mm and the inner diameter of 3mm is tested.
The inspection comprises the following steps:
the metallographic examination is carried out on the sampling of the inner cavity of the finished product, as shown in fig. 1 and 2, the surface quality of the inner cavity can reach P level, namely, under the condition of amplifying by two hundred times, the defects with the depth exceeding 0.01-0.02mm (maximum) are less than five, and the method accords with ISO 8535-1: 2016 internal cavity quality requirement, as shown in FIG. 2, one internal hole defect is only 8.65 μm; on the other hand, the steel pipes of the same specification which were not treated by the present invention were sampled and examined for metallographic phase, and as shown in FIG. 3, the inner hole defect was 81.47. mu.m.
Measuring the inner and outer diameter sizes: ensure within +/-0.05mm, no apparent surface defects are detected visually.
Thirdly, detecting by adopting eddy current flaw detection: the finished oil pipe has no defect of more than 0.01 mm.
Mechanical property test: six point positions are taken in the inner cavity of the finished product to test the mechanical property, and through a tensile test, the mechanical properties of the six point positions are as shown in the following table 1 and accord with ISO 8535-1: 2016.
Table 1:
and fifthly, performing fatigue test, namely measuring a fatigue curve at room temperature by adopting a single-point fatigue test method as shown in figure 4, and analyzing data to obtain the maximum working pressure which can be borne by the steel pipe and is more than 2200 bar.
In summary, on one hand, the mechanical strength and toughness of the material of our company reach high levels; on the other hand, the rapid propagation of fatigue defects is stopped by reducing defect sources, namely, the working pressure level is improved by reducing defects such as inner cavity cracks and the like. The production process invented by our company can raise the working pressure level of high-pressure oil pipe to over 2200 bar.
In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. A production process of a steel pipe for a high-pressure oil pipe is characterized by comprising the following steps:
a. inspecting raw materials;
b. pickling in 20-30% hydrochloric acid solution at 25-50 deg.C for 0.5-1 hr, washing with high pressure water, soaking in water-soluble antirust agent, and oven drying;
c. polishing, peeling, removing surface defects, and soaking in drawing and cold rolling oil for more than 2h to form a lubricating layer;
d. cold rolling: before the steel pipe is loaded on a rolling mill, oil is injected into the inner hole of the steel pipe, the main motor is controlled at 480-520r/min during cold rolling, and the frame reciprocates for 50-60 times/min and 4-6 mm/time;
e. cleaning the steel pipe by using an alkaline degreasing agent, soaking the steel pipe by using a water-soluble antirust agent after water washing, and drying the steel pipe;
f. bright heat treatment: annealing in a bright furnace protected by nitrogen and hydrogen atmosphere at the temperature of 800-900 ℃ for 30 min;
g. after straightening, cutting off the straightening scars on the head and the eccentric part of the tail, and honing;
h. soaking the honed pipe in active drawing oil for 30-60min at 40-70 deg.c;
i. continuously drawing for multiple times, wherein the elongation of each time is 1.2-1.4;
j. carrying out heat treatment on a finished product;
k. straightening for the second time and cutting off the head correcting mark and the tail eccentric part after straightening;
and l, inspecting, and packaging qualified products and warehousing.
2. The process for producing a steel pipe for a high pressure oil pipe as claimed in claim 1, wherein the pressure of the high pressure water in the step b is more than 6 atmospheres.
3. The process for producing a steel pipe for a high-pressure oil pipe as claimed in claim 1, wherein the straightening in step g and step k is carried out by a straightening machine, and the straightening speed in step k is controlled to 5m/s or less by a straightening machine having 10 rolls or more for the second straightening.
4. The process for producing a steel pipe for a high pressure oil pipe as claimed in claim 1, wherein in the honing of the step g, the honing head is rotated and reciprocated or the honing head is rotated and the workpiece is reciprocated, so that the working surface is cut into a cross spiral line and a cut amount of 0.5mm is secured to the inner wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010927301.4A CN112108532A (en) | 2020-09-07 | 2020-09-07 | Production process of steel pipe for high-pressure oil pipe |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010927301.4A CN112108532A (en) | 2020-09-07 | 2020-09-07 | Production process of steel pipe for high-pressure oil pipe |
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| CN112108532A true CN112108532A (en) | 2020-12-22 |
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2020
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| CN105127675A (en) * | 2015-07-09 | 2015-12-09 | 张家港市圣鼎源制管有限公司 | Preparation method of high-pressure oil pipe of automobile |
| CN107338397A (en) * | 2017-07-19 | 2017-11-10 | 浙江义腾特种钢管有限公司 | A kind of direct fuel injection machine high pressure oil rail gapless stainless steel tube production technology |
| CN111468557A (en) * | 2020-04-29 | 2020-07-31 | 浙江新航不锈钢有限公司 | Cold-drawing production line and production process for stainless steel seamless tube |
| CN111482483A (en) * | 2020-04-29 | 2020-08-04 | 浙江新航不锈钢有限公司 | Stainless steel seamless tube cold rolling production line and production process |
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