CN109402527A - A kind of economical P110 steel level oil bushing and its manufacturing method - Google Patents

A kind of economical P110 steel level oil bushing and its manufacturing method Download PDF

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Publication number
CN109402527A
CN109402527A CN201811319735.5A CN201811319735A CN109402527A CN 109402527 A CN109402527 A CN 109402527A CN 201811319735 A CN201811319735 A CN 201811319735A CN 109402527 A CN109402527 A CN 109402527A
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grades
class
pipe
steel
manufacturing
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CN109402527B (en
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肖永忠
曹铜壁
向鹏
高磊
宿敬波
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Linzhou Fengbao Pipe Co Ltd
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Linzhou Fengbao Pipe Co Ltd
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    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

Abstract

The present invention provides a kind of economical P110 steel level oil bushing and its manufacturing methods, the chemical component of the petroleum casing pipe is by mass percentage are as follows: C 0.30~0.34%, Si 0.20~0.35%, Mn 1.40-1.60%, P≤0.025%, S≤0.015%, Cr 0.15-0.30%, Mo≤0.10%, Cu≤0.20%, Al 0.005-0.040%, Ni≤0.20%, surplus are Fe and inevitable impurity.The present invention is by adjusting alloying element classification and content, tri- kinds of alloying elements of rational proportion C, Mn, Cr play the role of complex intensifying, alternative expensive alloy element V, reach same harden ability and Grain Refinement Effect, meets the performance requirement of P110 grade of steel high-strength and high-ductility.The present invention can substantially reduce production cost, reduce amplitude up to 20%, have higher economic benefit, can effectively improve the market competitiveness；Alloying element addition is reduced simultaneously, is good for the environment, can be had broad popularization and application prospect with energy efficiency.

Description

A kind of economical P110 steel level oil bushing and its manufacturing method
Technical field
The invention belongs to steel alloy manufacturing technology field more particularly to a kind of economical P110 steel level oil bushing and its systems Make method.
Background technique
At present in petroleum casing pipe industry steel grade used by production P110 steel level oil bushing be 25MnV, 25CrMnMo, The steel alloys such as 30CrMo, the performance of these materials can satisfy API standard requirement, but generally existing alloying element content is higher, Generally high-priced alloying element as V is all added to improve harden ability and refinement crystal grain, and production cost is higher, the market competitiveness Without clear superiority.Therefore need to develop a kind of petroleum casing pipe of the new steel grade of more economic, at low cost P110 grade of steel.
Summary of the invention
In order to solve the above technical problem, the present invention provides a kind of economical P110 steel level oil bushing, the petroleum sets The chemical component of pipe is by mass percentage are as follows: C 0.30~0.34%, Si 0.20~0.35%, Mn 1.40-1.60%, P ≤ 0.025%, S≤0.015%, Cr 0.15-0.30%, Mo≤0.10%, Cu≤0.20%, Al 0.005-0.040%, Ni ≤ 0.20%, surplus is Fe and inevitable impurity.
Further, in the inevitable impurity comprising non-metallic inclusion rank be respectively as follows: A class be carefully≤ 2.0 grades, A class be slightly≤1.5 grades, B class is carefully≤2.0 grades, B class is slightly≤1.5 grades, C class is carefully≤2.0 grades, C class be slightly≤ 2.0 grades, D class be carefully≤2.0 grades, D class is slightly≤2.0 grades, and the fine line level sum of A, B, C, D class non-metallic inclusion and Crude department level sum is not more than 6.0 grades respectively.
Further, the yield strength of the petroleum casing pipe is 840-935MPa, and tensile strength is >=930MPa, elongation percentage It is >=15%, 0 DEG C of longitudinal impact force is >=50J, and metallographic structure is tempered sorbite, grain size >=6 grade.
The present invention also provides a kind of manufacturing methods of economical P110 steel level oil bushing, comprising:
S1. pipe is smelted: by the raw materials for metallurgy configured by the chemical component such as economical P110 steel level oil bushing through turning Furnace smelting procedure, LF external refining process, VD are vacuum-treated process and continuous casting working procedure, obtain pipe；
S2. tube rolling: using perforation+continuous rolling process, and the pipe cut loading annular furnace is heated to best thermoplasticity temperature 1250 DEG C of region calculates heating time by 5-8min/cm coefficient；Subtract process through perforation process, tandem rolling process, heat after coming out of the stove and obtain Obtain hot rolled steel tube；
S3. it is heat-treated: heat treatment quenching and tempering processing is carried out to hot rolled steel tube using Quenching plus tempering process；
S4. it detects a flaw: ultrasonic nondestructive test being carried out to steel pipe, flaw detection rank is L2 grades.
Further, the temperature of the quenching technical in the step S3 is 870 ± 15 DEG C, soaking time coefficient 0.6- 0.8min/mm calculates soaking time according to wall thickness difference.
Further, the step S3 further include: quenching uses the type of cooling hardening immersed after spray in first extremely after coming out of the stove Room temperature, the water that cooling medium is 20-40 DEG C, hardening time 15S；Power 0.3-0.5MPa, nozzle inside diameter and steel pipe are sprayed in control Internal diameter unilateral gap 10-15mm；It immerses flow and is greater than 1000m3/h。
Further, the step S3 further include: carry out tempering after hardening in 15min, tempering temperature is 580 ± 5 DEG C, soaking time coefficient 1.2-1.6min/mm calculates soaking time, natural air cooling after coming out of the stove according to wall thickness difference.
Compared with prior art, the beneficial effects of the present invention are:
The present invention plays compound by adjusting alloying element classification and content, tri- kinds of alloying elements of rational proportion C, Mn, Cr Invigoration effect, alternative expensive alloy element V, reaches same harden ability and Grain Refinement Effect, and it is high-strength to meet P110 grade of steel The performance requirement of high tenacity.The present invention can substantially reduce production cost, reduce amplitude up to 20%, have higher economic effect Benefit can effectively improve the market competitiveness；Alloying element addition is reduced simultaneously, is good for the environment, and can be had wide with energy efficiency Popularization and application foreground.
Detailed description of the invention
Fig. 1 is the metallographic structure (X500) of the conditioned heat treatment of the petroleum casing pipe of embodiment 1.
Specific embodiment
A kind of economical P110 steel level oil bushing, chemical component is by mass percentage are as follows: C 0.30~0.34%, Si 0.20~0.35%, Mn 1.40-1.60%, P≤0.025%, S≤0.015%, Cr 0.15-0.30%, Mo≤ 0.10%, Cu≤0.20%, Al 0.005-0.040%, Ni≤0.20%, surplus are Fe and inevitable impurity.
In API standard, P110 grade of steel belongs to high-strength and high-ductility material, it is desirable that after quenching martensitic structure reach 90% with On, therefore it is more demanding for the harden ability and grain refinement effect of material.The prior art is generally by the high-cost V of addition Element adds principle using high Cr high Mo element and refines crystal grain, improves the harden ability of material, thus improve the strength of materials and Toughness, but often lead to the higher cost of material.The present invention is by the rational proportion between optimization each element, using low-carbon high-manganese Principle adjusts the content of C and Mn element under the premise of guaranteeing that through hardening performance reaches 90% or more martensite, and cooperates the content to be The Cr of 0.15-0.30% guarantees that material property meets the requirement of P110 grade of steel and can be substantially reduced manufacturing cost again.
Above-mentioned petroleum casing pipe is manufactured to include the following steps:
S1. the raw materials for metallurgy configured by the chemical component of above-mentioned petroleum casing pipe is subjected to converter smelting, LF external refining, VD Vacuum processing and continuous casting working procedure obtain pipe；
S2. perforation+continuous rolling process is used, the steel billet cut is fitted into annular furnace and is heated to best thermoplasticity temperature region 1250 DEG C, heating time is calculated by 5-8min/cm coefficient；It is good through perforation, tandem rolling, hot diameter-reducing formation inside and outside surface quality after coming out of the stove Good hot rolled steel tube；
S3. heat treatment quenching and tempering processing is carried out to hot rolled steel tube using Quenching plus tempering process；
(1) hardening heat is 870 ± 15 DEG C, soaking time coefficient 0.6-0.8min/mm, is calculated and is kept the temperature according to wall thickness difference Time；It can guarantee that the alloying elements such as C, Mn, Cr, Mo are sufficiently dissolved using above-mentioned quenching technical, mitigate cyrystal boundary segregation, closed The austenite structure that gold element is evenly distributed；
(2) hardening is to room temperature, hardening time 15S, using the hardening type of cooling of interior spray+immersion, cooling medium after coming out of the stove For Natural Water, it is desirable that 20-40 DEG C of water temperature, power 0.3-0.5MPa, nozzle inside diameter and pipe diameter unilateral gap 10- are sprayed in control 15mm, first immerses after interior spray, immerses flow and be greater than 1000 cubes/h by 20-40 DEG C of water temperature；Above-mentioned hardening technique can guarantee in steel pipe Outer cooling is uniform, can obtain 90% or more sufficiently martensitic tissue, is less prone to hardening flaw and generates large curved, Residual stress is smaller；
(3) lag time is not greater than 15min and must carry out tempering after hardening, and tempering temperature is 580 ± 5 DEG C, protects Warm time coefficient 1.2-1.6min/mm calculates soaking time, natural air cooling after coming out of the stove according to wall thickness difference；Above-mentioned tempering process The strength of materials can be reduced, plasticity toughness is improved, material inner tissue stress and thermal stress is eliminated, obtains more tempered martensite groups It knits, guarantees finally to meet API standard requirement mechanical property；
In the present invention, using quenched (quenching+tempering) technology mode, it can satisfy the height under petroleum casing pipe P110 grade of steel Intensity, the very special quality requirement problem of high tenacity；
S4. ultrasonic nondestructive test is carried out to steel pipe, flaw detection rank is L2 grades.
Economical P110 steel level oil bushing performance evaluation
Using above-mentioned manufacturing method, by chemical component shown in table 1, the economical P110 grade of steel stone of production example 1-5 Tubing and casing, the outer diameter of petroleum casing pipe are 220mm.
The chemical component (wt%) of the economical P110 steel level oil bushing of 1 embodiment 1-5 of table
C Si Mn P S Cr Mo Cu Al Ni
Embodiment 1 0.32 0.28 1.55 0.018 0.005 0.22 0.013 0.03 0.024 0.002
Embodiment 2 0.33 0.28 1.56 0.022 0.004 0.20 0.016 0.01 0.025 0.003
Embodiment 3 0.31 0.29 1.52 0.019 0.006 0.24 0.012 0.03 0.022 0.005
Embodiment 4 0.30 0.35 1.40 0.025 0.007 0.15 0.100 0.08 0.005 0.005
Embodiment 5 0.34 0.20 1.60 0.020 0.015 0.30 0.023 0.20 0.040 0.200
(1) the economical P110 steel level oil bushing of embodiment 1-5 is detected, the results are shown in Table 2 and table 3.
The performance test results of the economical P110 steel level oil bushing of 2 embodiment 1-5 of table
Yield strength/MPa Tensile strength/MPa Elongation percentage/% 0 DEG C of impact of collision function/J
API standard 758-965 ≥862 ≥13 ≥41
Embodiment 1 885 963 16 68
Embodiment 2 863 965 17 73
Embodiment 3 853 967 16 65
Embodiment 4 847 973 16 63
Embodiment 5 869 965 17 75
The nonmetal inclusion of the economical P110 steel level oil bushing of 3 embodiment 1-5 of table examines rank
(2) steel pipe of the conditioned heat treatment of the petroleum casing pipe of production example 1 is detected using metallographic microscope, The results are shown in attached figure 1.
By attached drawing 1 it is found that the metallographic structure (X500) of the petroleum casing pipe of embodiment 1 is uniform tiny tempered sorbite tissue (containing a small amount of position to martensite), 9 grades of grain size.
By above-mentioned testing result, it is found that petroleum casing pipe of the invention is smelted, steel is pure, and alloying element proportion is rationally, quenched Tissue is uniformly tiny tempered sorbite tissue, and material property has good impact flexibility while with high intensity, Fully meet the requirement of API 5CT standard criterion.
Finally it should be noted that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although reference Preferred embodiment describes the invention in detail, those skilled in the art should understand that, it can be to of the invention Technical solution is modified or replaced equivalently, and without departing from the spirit and scope of the technical solution of the present invention, should all be covered In scope of the presently claimed invention.

Claims (7)

1. a kind of economical P110 steel level oil bushing, which is characterized in that the chemical component of the petroleum casing pipe presses quality percentage Than being calculated as: C 0.30~0.34%, Si 0.20~0.35%, Mn 1.40-1.60%, P≤0.025%, S≤0.015%, Cr 0.15-0.30%, Mo≤0.10%, Cu≤0.20%, Al 0.005-0.040%, Ni≤0.20%, surplus are Fe and can not The impurity avoided.
2. petroleum casing pipe according to claim 1, which is characterized in that include nonmetallic folder in the inevitable impurity The rank of sundries be respectively as follows: A class be carefully≤2.0 grades, A class is slightly≤1.5 grades, B class is carefully≤2.0 grades, B class is slightly≤1.5 grades, C class is carefully≤2.0 grades, C class is slightly≤2.0 grades, D class is carefully≤2.0 grades, D class is slightly≤2.0 grades, and the non-gold of A, B, C, D class The fine line level sum and crude department level sum for belonging to field trash are not more than 6.0 grades respectively.
3. petroleum casing pipe according to claim 1, which is characterized in that the yield strength of the petroleum casing pipe is 840- 935MPa, tensile strength are >=930MPa, and elongation percentage is >=15%, and 0 DEG C of longitudinal impact force is >=50J, and metallographic structure is tempering Sorbite, grain size >=6 grade.
4. a kind of manufacturing method of economical P110 steel level oil bushing, which is characterized in that the manufacturing method includes:
S1. it smelts pipe: the raw materials for metallurgy configured by the chemical component of petroleum casing pipe a method according to any one of claims 1-3 is passed through Converter smelting process, LF external refining process, VD are vacuum-treated process and continuous casting working procedure, obtain pipe；
S2. tube rolling: using perforation+continuous rolling process, and the pipe cut loading annular furnace is heated to best thermoplasticity temperature region 1250 DEG C, heating time is calculated by 5-8min/cm coefficient；Subtract process through perforation process, tandem rolling process, heat after coming out of the stove and obtains heat Roll state steel pipe；
S3. it is heat-treated: heat treatment quenching and tempering processing is carried out to hot rolled steel tube using Quenching plus tempering process；
S4. it detects a flaw: ultrasonic nondestructive test being carried out to steel pipe, flaw detection rank is L2 grades.
5. manufacturing method according to claim 4, which is characterized in that the temperature of the quenching technical in the step S3 is 870 ± 15 DEG C, soaking time coefficient 0.6-0.8min/mm, soaking time is calculated according to wall thickness difference.
6. manufacturing method according to claim 5, which is characterized in that the step S3 further include: quenching uses after coming out of the stove The type of cooling hardening immersed after spray in first is to room temperature, the water that cooling medium is 20-40 DEG C, hardening time 15S；It is sprayed in control Power 0.3-0.5MPa, nozzle inside diameter and pipe diameter unilateral gap 10-15mm；It immerses flow and is greater than 1000m3/h。
7. manufacturing method according to claim 6, which is characterized in that the step S3 further include: after hardening in 15min into Row tempering, tempering temperature are 580 ± 5 DEG C, soaking time coefficient 1.2-1.6min/mm, are calculated and are kept the temperature according to wall thickness difference Time, natural air cooling after coming out of the stove.
CN201811319735.5A 2018-11-07 2018-11-07 Economical P110 steel-grade petroleum casing pipe and manufacturing method thereof Active CN109402527B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111304529A (en) * 2019-12-02 2020-06-19 张子夜 Seamless steel tube for multi-stage oil cylinder and manufacturing method thereof
CN113817956A (en) * 2021-08-02 2021-12-21 包头钢铁（集团）有限责任公司 700 MPa-level economical seamless gas cylinder steel pipe and manufacturing method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003277992A (en) * 2002-03-27 2003-10-02 Nisshin Steel Co Ltd Automobile fuel tank or oil feeding pipe made of stainless steel having excellent corrosion resistance
JP2005105357A (en) * 2003-09-30 2005-04-21 Jfe Steel Kk High-strength stainless steel pipe superior in corrosion resistance for oil well
CN1664147A (en) * 2005-03-15 2005-09-07 无锡西姆莱斯石油专用管制造有限公司 High anti-extrusion petroleum casing pipe and method for producing same
CN101446180A (en) * 2008-11-06 2009-06-03 天津钢铁有限公司 Round blank for high-steel level oil bushing and manufacturing process
CN101921957A (en) * 2010-07-09 2010-12-22 天津钢管集团股份有限公司 Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003277992A (en) * 2002-03-27 2003-10-02 Nisshin Steel Co Ltd Automobile fuel tank or oil feeding pipe made of stainless steel having excellent corrosion resistance
JP2005105357A (en) * 2003-09-30 2005-04-21 Jfe Steel Kk High-strength stainless steel pipe superior in corrosion resistance for oil well
CN1664147A (en) * 2005-03-15 2005-09-07 无锡西姆莱斯石油专用管制造有限公司 High anti-extrusion petroleum casing pipe and method for producing same
CN101446180A (en) * 2008-11-06 2009-06-03 天津钢铁有限公司 Round blank for high-steel level oil bushing and manufacturing process
CN101921957A (en) * 2010-07-09 2010-12-22 天津钢管集团股份有限公司 Method for manufacturing high-grade anti-corrosion seamless steel tube with large diameter ranging from phi460.0 mm to 720.0mm

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111304529A (en) * 2019-12-02 2020-06-19 张子夜 Seamless steel tube for multi-stage oil cylinder and manufacturing method thereof
CN113817956A (en) * 2021-08-02 2021-12-21 包头钢铁（集团）有限责任公司 700 MPa-level economical seamless gas cylinder steel pipe and manufacturing method thereof

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