CN116694902A - Heat treatment method for large-caliber X52QH hydrogen-delivery pipeline tube - Google Patents
Heat treatment method for large-caliber X52QH hydrogen-delivery pipeline tube Download PDFInfo
- Publication number
- CN116694902A CN116694902A CN202310698363.6A CN202310698363A CN116694902A CN 116694902 A CN116694902 A CN 116694902A CN 202310698363 A CN202310698363 A CN 202310698363A CN 116694902 A CN116694902 A CN 116694902A
- Authority
- CN
- China
- Prior art keywords
- seamless steel
- x52qh
- equal
- steel tube
- heat treatment
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 53
- 239000010959 steel Substances 0.000 claims abstract description 53
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 26
- 239000001257 hydrogen Substances 0.000 claims abstract description 26
- 238000010791 quenching Methods 0.000 claims abstract description 17
- 230000000171 quenching effect Effects 0.000 claims abstract description 17
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 238000004321 preservation Methods 0.000 claims abstract description 14
- 238000005496 tempering Methods 0.000 claims abstract description 11
- 238000001816 cooling Methods 0.000 claims abstract description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 125000004435 hydrogen atom Chemical class [H]* 0.000 claims abstract 7
- 238000005507 spraying Methods 0.000 claims description 21
- 239000000126 substance Substances 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 abstract description 4
- 238000005275 alloying Methods 0.000 abstract description 2
- 238000001514 detection method Methods 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 10
- 150000002431 hydrogen Chemical class 0.000 description 9
- 230000008901 benefit Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process 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
- 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
- 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
- C21D11/00—Process control or regulation for heat treatments
- C21D11/005—Process control or regulation for heat treatments for cooling
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/002—Heat treatment of ferrous alloys containing Cr
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- 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
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D8/105—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies of ferrous alloys
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Heat Treatment Of Articles (AREA)
Abstract
The invention discloses a heat treatment method of a large-caliber X52QH hydrogen transmission pipeline tube, which comprises the following process flows: hot rolled seamless steel tube- & gt quenching furnace heatingThe method comprises the steps of quenching furnace heat preservation, tapping, water quenching, tempering furnace heating, tempering furnace soaking, tempering furnace heat preservation, tapping, air cooling, head and tail end sampling and detection analysis. The seamless steel tube for the hot-rolled X52QH hydrogen transmission pipeline adopts the combination of C+Mn+Cr+Mo+Ti alloying elements, so that the carbon equivalent CE in the steel PCM The temperature is less than or equal to 0.19, and the seamless steel tube is subjected to water quenching tempering heat treatment, so that the mechanical properties of the steel tube are as follows: yield strength: 420MPa to 450MPa; tensile strength: 525 MPa-560 MPa; yield ratio: less than or equal to 0.85; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃): AKV is more than or equal to 350J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Grain size: and the grade is more than or equal to 9.
Description
Technical Field
The invention relates to the field of ferrous metal smelting and metal pressure processing, in particular to a heat treatment method of a large-caliber X52QH hydrogen transmission pipeline tube.
Background
Hydrogen is considered as one of the important energy sources which will be widely used in the 2l century, and has the advantages of rich resource reserves, large heat generated by combustion, more manufacturing methods, high economic benefit, environmental protection of combustion products and the like. Currently, as limited fossil energy sources are gradually decreasing, various advantages of hydrogen energy sources are more prominent. The factors in various aspects are combined to show that the hydrogen energy source has great application potential, can provide important support for sustainable development of human society, and the current hydrogen conveying pipeline adopts low-strength pipeline steel to avoid hydrogen embrittlement.
The hydrogen energy is used as one of the energy carriers, which can effectively relieve the greenhouse effect and ensure the energy supply. Currently, about 3000km of hydrogen transmission pipelines are available worldwide, the maximum service pressure is 10MPa, hydrogen is mainly provided for chemical or petroleum industry, and the steel grade of the pipe body of the hydrogen transmission pipeline is not more than X52. The invention aims to provide a heat treatment method of a large-caliber X52QH hydrogen transmission pipeline tube.
Disclosure of Invention
The invention aims to provide a heat treatment method of a large-caliber X52QH hydrogen transmission pipeline tube, which ensures that each performance of the steel tube is excellent.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention discloses a heat treatment method of a large-caliber X52QH hydrogen transmission pipeline tube, which comprises the following steps:
1) Seamless steel tube for hot rolled X52QH pipeline with qualified size precision and appearance quality, so that the carbon equivalent CE in the steel PCM ≤0.19；
2) Putting the seamless steel tube into a quenching furnace, heating the seamless steel tube to 910+/-10 ℃ at the temperature of a heat preservation section, preserving heat for 8 minutes, and discharging;
3) Carrying out water quenching heat treatment on the seamless steel tube discharged from a quenching furnace, wherein the water spraying amount of a nozzle in the head end of the steel tube is 3600m 3 And/h, the external water spraying quantity of the external water spraying pipe is 4000m 3 And/h, starting inner water spraying after the outer water spraying is started for 3 seconds, wherein the outer water spraying and the inner water spraying are both performed for 40-44 seconds, the rotating speed of a radial wheel is 32-38 revolutions per minute, and cooling the seamless steel pipe to below 100 ℃;
4) Heating the seamless steel pipe to 640 ℃ for soaking and heat preservation, wherein the total time is controlled to be 140-160 minutes from heating to heat preservation, and the furnace temperature is controlled to be +/-10 ℃;
5) Discharging the seamless steel tube from the furnace for air cooling after the tempering heat treatment is finished;
6) Respectively taking 300mm pipe end samples from the head end and the tail end of the seamless steel pipe after heat treatment, and carrying out mechanical property and microstructure analysis; and the chemical components and the mechanical properties are qualified, namely the finished product of the seamless steel tube for the X52QH pipeline.
Further, the X52QH hydrogen-conveying pipeline comprises the following chemical components in percentage by mass: 0.08-0.11% of C, 0.30-0.40% of Si, 1.0-1.15% of Mn and less than or equal to 0.010% of P; less than or equal to 0.003 percent of S, 0.15 to 0.28 percent of Cr, 0.1 to 0.15 percent of Mo, 0.01 to 0.02 percent of Ti, and the balance of Fe and unavoidable impurities.
Further, the performance of the X52QH hydrogen delivery pipeline tube is as follows: yield strength: 420MPa to 450MPa; tensile strength: 525 MPa-560 MPa; yield ratio: less than or equal to 0.85; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃): AKV is more than or equal to 350J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Grain size: and the grade is more than or equal to 9.
Compared with the prior art, the invention has the beneficial technical effects that:
the seamless steel tube for the hydrogen delivery pipeline of the hot rolled state X52QH adopts the combination of C+Mn+Cr+Mo+Ti alloying elements to produce the seamless steel tube for the hydrogen delivery pipeline with the wall thickness of 11mmTube such that the carbon equivalent CE in the steel PCM ≤0.19。
The steel pipe is subjected to water quenching tempering heat treatment, and has excellent performances, and specific performance indexes are as follows: yield strength: 420MPa to 450MPa; tensile strength: 525 MPa-560 MPa; yield ratio: less than or equal to 0.85; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃): AKV is more than or equal to 350J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Grain size: and the grade is more than or equal to 9.
Drawings
The invention is further described with reference to the following description of the drawings.
FIG. 1 is a photograph of a microstructure of example 1;
FIG. 2 is a photograph of the microstructure of example 2;
FIG. 3 is a photograph of the microstructure of example 3.
Detailed Description
The present invention will be described in further detail with reference to examples 1 to 3.
And rolling qualified seamless steel pipes for hot-rolled X52QH hydrogen transmission pipelines so that the carbon equivalent CEPCM in the steel is less than or equal to 0.19.
The production process flow sequence is as follows: hot rolling of seamless steel pipes, heating of a quenching furnace, heat preservation of the quenching furnace, tapping, water quenching, heating of the tempering furnace, soaking of the tempering furnace, heat preservation of the tempering furnace, tapping, air cooling, sampling of the head end and the tail end, and detection analysis.
The specific production process flow is briefly described as follows:
1. the qualified rolled seamless steel tube for the X52QH hydrogen transmission pipeline in the hot rolling state ensures that the carbon equivalent CE in the steel PCM ≤0.19。
2. And (3) loading the seamless steel tube into a quenching furnace, heating to 910 ℃ in the heat preservation section of the seamless steel tube after passing through the heating section and the heat preservation section, and preserving heat for 8 minutes.
3. The seamless steel tube is discharged from a quenching furnace to be subjected to water quenching heat treatment, and the water spraying amount of a nozzle in the head end of the steel tube is 3600m 3 And/h, the external water spraying quantity of the external water spraying pipe is 4000m 3 And (3) starting inner water spraying after the outer water spraying is started for 3 seconds, wherein the outer water spraying and the inner water spraying are both carried out for 42 seconds, the rotating speed of a radial wheel is 35 revolutions per minute, and the seamless steel pipe is cooled to below 100 ℃; .
4. Heating the seamless steel tube to 640 ℃ for soaking and heat preservation, wherein the total time is controlled to be 150 minutes from heating to heat preservation, and the furnace temperature is controlled to be +/-10 ℃; .
5. And discharging the seamless steel tube from the furnace for air cooling after the tempering heat treatment is finished.
6. And (5) respectively taking 300mm pipe end samples from the head end and the tail end of the heat-treated seamless steel pipe, and carrying out mechanical property and microstructure analysis.
After heat treatment, the seamless steel tube for the X52QH hydrogen transmission pipeline with the specification of phi 457mm multiplied by 11mm multiplied by 12000mm (the outer diameter of the steel tube multiplied by the wall thickness of the steel tube multiplied by the length of the steel tube) is sampled and subjected to chemical examination, the chemical composition test results (weight percentage content) are shown in the table 1, the mechanical property test results and the table 2 are shown in the table 3, and the microstructure photographs are shown in the figures 1 to 3.
TABLE 1 chemical composition measurement results (wt.%) of tube blank
| C | Si | Mn | P | S | Cr | Mo | Ti | CE PCM | |
| Example 1 | 0.09 | 0.31 | 1.10 | 0.005 | 0.002 | 0.19 | 0.12 | 0.011 | 0.18 |
| Example 2 | 0.10 | 0.31 | 1.09 | 0.008 | 0.003 | 0.24 | 0.13 | 0.012 | 0.18 |
| Example 3 | 0.09 | 0.32 | 1.01 | 0.007 | 0.002 | 0.21 | 0.11 | 0.014 | 0.18 |
Table 2 mechanical properties test results of seamless steel pipes
| R t0.5 (MPa) | R m (MPa) | R t0.5 /R m | A(％) | A KV (-20 ℃, transverse, J/cm) 2 ) | |
| Example 1 | 431 | 535 | 0.80 | 43 | 421，403，410 |
| Example 2 | 441 | 530 | 0.83 | 41 | 391，403，402 |
| Example 3 | 449 | 544 | 0.82 | 42 | 415，399，409 |
Table 3 metallographic phase Performance test results (grade) of seamless Steel pipes
The above embodiments are only illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (3)
1. A heat treatment method of a large-caliber X52QH hydrogen transmission pipeline tube is characterized by comprising the following steps:
1) Seamless steel tube for hot rolled X52QH pipeline with qualified size precision and appearance quality, so that the carbon equivalent CE in the steel PCM ≤0.19；
2) Putting the seamless steel tube into a quenching furnace, heating the seamless steel tube to 910+/-10 ℃ at the temperature of a heat preservation section, preserving heat for 8 minutes, and discharging;
3) Carrying out water quenching heat treatment on the seamless steel tube discharged from a quenching furnace, wherein the water spraying amount of a nozzle in the head end of the steel tube is 3600m 3 And/h, the external water spraying quantity of the external water spraying pipe is 4000m 3 And/h, starting inner water spraying after the outer water spraying is started for 3 seconds, wherein the outer water spraying and the inner water spraying are both performed for 40-44 seconds, the rotating speed of a radial wheel is 32-38 revolutions per minute, and cooling the seamless steel pipe to below 100 ℃;
4) Heating the seamless steel pipe to 640 ℃ for soaking and heat preservation, wherein the total time is controlled to be 140-160 minutes from heating to heat preservation, and the furnace temperature is controlled to be +/-10 ℃;
5) Discharging the seamless steel tube from the furnace for air cooling after the tempering heat treatment is finished;
6) Respectively taking 300mm pipe end samples from the head end and the tail end of the seamless steel pipe after heat treatment, and carrying out mechanical property and microstructure analysis; and the chemical components and the mechanical properties are qualified, namely the finished product of the seamless steel tube for the X52QH pipeline.
2. The heat treatment method of the large-caliber X52QH hydrogen transmission pipeline tube according to claim 1, wherein the X52QH hydrogen transmission pipeline tube comprises the following chemical components in percentage by mass: 0.08-0.11% of C, 0.30-0.40% of Si, 1.0-1.15% of Mn and less than or equal to 0.010% of P; s is less than or equal to 0.003%, cr is 0.15-0.28%, mo
0.1-0.15%, ti0.01-0.02%, and Fe and unavoidable impurities as the rest.
3. The heat treatment method of a large-caliber X52QH hydrogen transfer line pipe according to claim 1, wherein the performance of the X52QH hydrogen transfer line pipe is as follows: yield strength: 420MPa to 450MPa; tensile strength: 525 MPa-560 MPa; yield ratio: less than or equal to 0.85; elongation percentage: more than or equal to 35 percent; transverse impact value at 0 ℃): AKV is more than or equal to 350J/cm 2 The method comprises the steps of carrying out a first treatment on the surface of the Grain size: and the grade is more than or equal to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698363.6A CN116694902A (en) | 2023-06-13 | 2023-06-13 | Heat treatment method for large-caliber X52QH hydrogen-delivery pipeline tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310698363.6A CN116694902A (en) | 2023-06-13 | 2023-06-13 | Heat treatment method for large-caliber X52QH hydrogen-delivery pipeline tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116694902A true CN116694902A (en) | 2023-09-05 |
Family
ID=87842942
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310698363.6A Pending CN116694902A (en) | 2023-06-13 | 2023-06-13 | Heat treatment method for large-caliber X52QH hydrogen-delivery pipeline tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116694902A (en) |
-
2023
- 2023-06-13 CN CN202310698363.6A patent/CN116694902A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP2468904B1 (en) | Method for manufacturing thick-walled seamless steel pipe | |
| RU2650466C2 (en) | Steel pipe for high-pressure fuel pipe and high-pressure fuel pipe comprising it | |
| JP4894855B2 (en) | Seamless pipe manufacturing method | |
| WO2012127811A1 (en) | Steel pipe quenching method | |
| CN104894485A (en) | Production method of nuclear power plant used high-temperature-resisting brittleness-resisting seamless steel tube with outer diameter of more than 508mm | |
| JP2017031493A (en) | Manufacturing method of stainless steel pipe | |
| CN111118257A (en) | Heat treatment method for improving impact toughness of boron-containing thick hydroelectric steel plate core | |
| CN110756616B (en) | Preparation method for reducing high-carbon martensitic stainless steel pipe | |
| CN100467205C (en) | Production of L80-13Cr oil casings | |
| CN108950148B (en) | Method for improving radial structure and performance uniformity of G115 steel large-caliber thick-wall pipe | |
| CN116694902A (en) | Heat treatment method for large-caliber X52QH hydrogen-delivery pipeline tube | |
| JP3379345B2 (en) | Method for producing 13Cr stainless steel tube having oxide layer | |
| JPH09241746A (en) | Production of high strength duplex stainless steel tube | |
| CN116590510A (en) | Heat treatment method of L290QH hydrogen-transporting pipeline tube | |
| CN109338221B (en) | Trailer axle tube and production method thereof | |
| JPH0545651B2 (en) | ||
| CN101899612B (en) | Non-tempered steel pipe and preparation method thereof | |
| CN117965864A (en) | X60Q pipeline tube heat treatment method with steel tube wall thickness larger than 25mm | |
| JP2002285236A (en) | Method for working ferritic heat resistant steel and ferritic heat resistant steel having excellent water vapor oxidation resistance | |
| CN112281111A (en) | High-yield seamless steel tube machining process for automobile semi-axle suspension | |
| CN115537537A (en) | Heat treatment method for X65Q pipeline pipe with steel pipe wall thickness larger than 25mm | |
| CN111471930A (en) | High-strength corrosion-resistant machining process for steel pipe | |
| CN115717192A (en) | Heat treatment method of B-containing pipeline seamless steel pipe with wall thickness larger than 25mm | |
| CN117144228B (en) | Low-temperature-resistant corrosion-resistant seamless steel pipe and processing technology thereof | |
| CN108570542A (en) | The manufacturing method of high-strength steel for oil well pipes |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |