CN104087826B - Large-caliber thin-walled X65 level hot-expanding seamless steel tubes and production method - Google Patents
Large-caliber thin-walled X65 level hot-expanding seamless steel tubes and production method Download PDFInfo
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- CN104087826B CN104087826B CN201410329561.6A CN201410329561A CN104087826B CN 104087826 B CN104087826 B CN 104087826B CN 201410329561 A CN201410329561 A CN 201410329561A CN 104087826 B CN104087826 B CN 104087826B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 71
- 239000010959 steel Substances 0.000 title claims abstract description 71
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 15
- 230000006698 induction Effects 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims abstract description 6
- 238000005096 rolling process Methods 0.000 claims abstract description 6
- 238000003723 Smelting Methods 0.000 claims abstract description 5
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 5
- 239000000956 alloy Substances 0.000 claims abstract description 5
- 239000012535 impurity Substances 0.000 claims abstract description 5
- 238000004513 sizing Methods 0.000 claims abstract description 5
- 238000000889 atomisation Methods 0.000 claims abstract description 3
- 101000702393 Homo sapiens Signal peptide peptidase-like 2B Proteins 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052720 vanadium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000859 α-Fe Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 238000000137 annealing Methods 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 229910001562 pearlite Inorganic materials 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 238000003303 reheating Methods 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
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Abstract
A kind of large-caliber thin-walled X65 level hot-expanding seamless steel tubes and production method, its outer diameter D is: 406 ~ 609, tolerance is :+/ 0.75%D, wall thickness S is: 6.35 ~ 9.53, tolerance is :+/ 12.5%S, composition, in terms of quality %, specifically has: C:0.24～0.28, Mn:1.25～1.40, V:0.10～0.13, Al:0.01～0.04, Si:0.45～0.60, P≤0.025, S≤0.015, B≤0.001, and remaining is Fe and inevitable impurity.First smelting scrap steel is become molten steel, then with addition of required alloy, obtain the molten steel in accordance with steel pipe component requirements, EBT → LF → VD → CCM technique is used to produce circle blank, obtaining the female pipe of heat expansion by the perforation → tandem rolling → sizing → alignment → sawing of 340 Continuous mill train, then carry out heat expansion by local Frequency Induction Heating thermal expansion machine, heat expands temperature below AC1 line, carry out weak atomization water-cooled when steel pipe adds the 300mm section after thermal expansion goes out induction coil, obtain required large-diameter thin-wall seamless steel pipe.
Description
Technical field
The present invention relates to seamless steel tube production technical field, a kind of large-caliber thin-walled X65 level hot-expanding seamless steel tubes
And production method.
Background technology
In seamless steel tube production process, large-diameter thin-wall seamless steel pipe such as 406 × 6.35,508 × 6.35～
7.0,609.6 × 9.53 specification steel pipe's production mainly use local Frequency Induction Heating heat to expand technique, this steel pipe
Energy X65 level to be reached, generally uses two kinds of methods: one is fall C and addition micro alloying element V, Nb, Ti, then by quenched heat
Process the mechanical performance meeting steel pipe, but this production method can make steel pipe deform during quenched, makes time serious
Become waste product；Two is to improve C, Mn content, is expanded by reheating after hot rolling mother's pipe and becomes a useful person, and C, Mn content improves and the adding of microalloy element
Although entering to make the tensile strength of hot finished steel pipe and yield strength to improve, but elongation percentage reduces, cost up, meanwhile, affects steel pipe
Welding performance, and API5L(45th) PSL1 X65 standard specifies: C≤0.28%, Mn≤1.40%, if C reduces, Mn can
To increase, but maximum less than 1.75%.If do not taken appropriate measures when this hot rolling mother Guan Re expands, its tensile strength is with in the wrong
Take intensity also can decline.Therefore, suitable steel grades must be selected, repave weak atomization water-cooled when expanding with Steel Pipe Heat, make
This hot-expanding pipe is heated to during the AC1 temperature of this steel grade a certain temperature near or below carry out pressure processing, then with plug
After slowly cooling to uniform temperature, air cooling is to room temperature, and this special low temperature deformation annealing process is owing to being in the austenite of steel again
Below crystallization temperature, metal carbides dissolve difficulty so that the strength of materials rises.
Summary of the invention
It is an object of the invention to overcome the above-mentioned deficiency of prior art to provide the expansion of a kind of large-caliber thin-walled X65 level heat seamless
Steel pipe and production method.
The technical scheme is that a kind of large-caliber thin-walled X65 level hot-expanding seamless steel tubes, its outer diameter D is: 406 ~ 609
, tolerance is: +/-0.75%D, and wall thickness S is: 6.35 ~ 9.53, and tolerance is: +/-12.5%S；Composition is in terms of quality %, specifically
Have: C:0.24～0.28, Mn:1.25～1.40, V: 0.10～0.13, Al:0.01～0.04, Si:0.45～0.60, P≤
0.025, S≤0.015, B≤0.001, remaining is Fe and inevitable impurity.
In mentioned component:
C is carbide former, and certain C content can improve intensity and the hardness of matrix, but C content height can reduce steel
Elongation percentage and to welding unfavorable, API5L X65 PSL1 specifies C≤0.28(Wt%).
Mn is to make up pipe line steel to cause the most economical intensified element of loss of strength because C content reduces, and Mn can be dissolved in ferrum
Ferritic makes ferrite strengthen, and also can be dissolved in cementite, improve its hardness, and Mn can also increase and refine pearlite, improves the strong of steel
Degree and hardness, can improve the elevated temperature strength of material, but the heat conductivity that too high levels makes steel reduces.
Si can be dissolved in ferrite and be allowed to strengthen, and improves intensity and the hardness of steel pipe.
V has slight thinning microstructure and medium precipitation strength effect, separates out V in pipe line steel cooling procedure after rolling
(C, N) produces precipitation strength, thus improves the intensity of steel, and wherein the effect of VN is greater than NbN and TiN.
Al can strengthen the intensity of deoxidation and the crystal grain thinning of steel, beneficially steel and improve.
Present invention also offers the production method of a kind of large-caliber thin-walled X65 level hot-expanding seamless steel tubes, suitable by controlling
C, Mn, V, Al, Si content, Steel Pipe Heat expand time use atomized water cooling, make the physicochemical property of tube material reach API5L
(45th) PSL1 X65.Its concrete production method is as follows:
First smelting scrap steel is become molten steel, then with addition of required alloy, obtain the molten steel in accordance with steel pipe component requirements, use
EBT → LF → VD → CCM technique produces circle blank, by the perforation → tandem rolling → sizing → alignment → sawing of 340 Continuous mill train
Obtaining heat expansion mother's pipe, then carry out heat expansion by local Frequency Induction Heating thermal expansion machine, the hot temperature that expands is below AC1 line, actual
Hot-expanding pipe temperature controls, at 710 ~ 730 DEG C, to carry out weak atomized water when steel pipe adds 300 sections after thermal expansion goes out induction coil
Cold, obtain required large-diameter thin-wall seamless steel pipe.
After the heat that carries out the large-caliber thin-walled X65 level hot-expanding seamless steel tubes that the present invention provides expands, it is no longer necessary to carry out heat treatment,
Ensure that the stability of steel pipe apparent size, reduce manufacturing cost simultaneously.
The present invention compared with prior art has a characteristic that
The present invention is by designing the composition of large-caliber thin-walled X65 level hot-expanding seamless steel tubes, and heat uses weak atomized water when expanding
Cold technique produces, and hot-expanding pipe is made without off-line Tempering and Quenching, not only reduces cost, and when avoiding because of heat treatment
The waste product that apparent size deformation is serious and causes, thus obtain the X65 PSL1 seamless steel pipe that physicochemical property is good.
Detailed description of the invention
Embodiment one,
A kind of large-caliber thin-walled X65 level hot-expanding seamless steel tubes, its outer diameter D is: 406, and tolerance is: +/-0.75%D, wall thickness
S is: 6.35, and tolerance is: +/-12.5%S；Composition, in terms of quality %, specifically has: C:0.24～0.26, Mn:1.25～1.30,
V: 0.10～0.12, Al:0.010～0.025, Si:0.45～0.50, P≤0.025, S≤0.015, B≤0.001, remaining is
Fe and inevitably impurity.
Its concrete production method is as follows:
First smelting scrap steel is become molten steel, then with addition of required alloy, obtain the molten steel in accordance with steel pipe component requirements, use
EBT → LF → VD → CCM technique produces circle blank, by the perforation → tandem rolling → sizing → alignment → sawing of 340 Continuous mill train
Obtaining heat expansion mother's pipe, then carry out heat expansion by local Frequency Induction Heating thermal expansion machine, the hot temperature that expands is below AC1 line, actual
Hot-expanding pipe temperature controls, at 710 ~ 730 DEG C, to carry out weak atomized water when steel pipe adds the 300mm section after thermal expansion goes out induction coil
Cold, obtain required large-diameter thin-wall seamless steel pipe.
The mechanical property of steel pipe is shown in Table 1.
Table 1 mechanical properties of pipe
| Material | σ s(Mpa) | σ b(Mpa) | δ (%) |
| The large-caliber thin-walled hot-expanding seamless steel tubes of X65 level | 470~520 | 560~630 | ≥32 |
| PSL1 X65 grade standard requirement | ≥450 | ≥535 | ≥28 |
Embodiment two,
A kind of large-caliber thin-walled X65 level hot-expanding seamless steel tubes, its outer diameter D is: 609, and tolerance is: +/-0.75%D, wall thickness
S is: 9.53, and tolerance is: +/-12.5%S；Composition, in terms of quality %, specifically has: C:0.26～0.28, Mn:1.30～1.40,
V: 0.12～0.13, Al:0.025～0.040, Si:0.50～0.60, P≤0.025, S≤0.015, B≤0.001, remaining is
Fe and inevitably impurity.
Its concrete production method is as follows:
First smelting scrap steel is become molten steel, then with addition of required alloy, obtain the molten steel in accordance with steel pipe component requirements, use
EBT → LF → VD → CCM technique produces circle blank, by the perforation → tandem rolling → sizing → alignment → sawing of 340 Continuous mill train
Obtaining heat expansion mother's pipe, then carry out heat expansion by local Frequency Induction Heating thermal expansion machine, the hot temperature that expands is below AC1 line, actual
Hot-expanding pipe temperature controls, at 710 ~ 730 DEG C, to carry out weak atomized water when steel pipe adds the 300mm section after thermal expansion goes out induction coil
Cold, obtain required large-diameter thin-wall seamless steel pipe.
The mechanical property of steel pipe is shown in Table 2.
Table 2 mechanical properties of pipe
| Material | σ s(Mpa) | σ b(Mpa) | δ (%) |
| The large-caliber thin-walled hot-expanding seamless steel tubes of X65 level | 470~520 | 560~630 | ≥32 |
| PSL1 X65 grade standard requirement | ≥450 | ≥535 | ≥28 |
Claims (1)
1. a large-caliber thin-walled X65 level hot-expanding seamless steel tubes, its outer diameter D is: 406 ~ 609, and tolerance is: +/-0.75%D, wall
Thick S is: 6.35 ~ 9.53, and tolerance is: +/-12.5%S, and composition, in terms of quality %, specifically has: C:0.24～0.28, Mn:1.25
～1.40, V: 0.10～0.13, Al:0.01～0.04, Si:0.45～0.60, P≤0.025, S≤0.015, B≤0.001,
Remaining is Fe and inevitable impurity；It is characterized in that: its concrete production method is as follows:
First smelting scrap steel is become molten steel, then with addition of required alloy, obtain the molten steel in accordance with steel pipe component requirements, use EBT
→ LF → VD → CCM technique produces circle blank, is obtained by the perforation → tandem rolling → sizing → alignment → sawing of 340 Continuous mill train
Heat expands manages with mother, then carries out heat expansion by local Frequency Induction Heating thermal expansion machine, and heat expansion temperature is below AC1 line, and actual heat expands
Pipe temperature controls at 710 ~ 730 DEG C, carries out weak atomization water-cooled when steel pipe adds 300 sections after thermal expansion goes out induction coil,
To required large-diameter thin-wall seamless steel pipe.
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| CN201410329561.6A CN104087826B (en) | 2014-07-11 | 2014-07-11 | Large-caliber thin-walled X65 level hot-expanding seamless steel tubes and production method |
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| CN201410329561.6A CN104087826B (en) | 2014-07-11 | 2014-07-11 | Large-caliber thin-walled X65 level hot-expanding seamless steel tubes and production method |
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| CN104087826A CN104087826A (en) | 2014-10-08 |
| CN104087826B true CN104087826B (en) | 2016-09-14 |
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| CN107326280B (en) * | 2017-07-10 | 2019-06-04 | 衡阳鸿大特种钢管股份有限公司 | Large-caliber thin-walled X42 grades of low-temperature impact resistance hot-expanding seamless steel tubes and production method |
| CN111979485A (en) * | 2020-08-05 | 2020-11-24 | 衡阳鸿大特种钢管股份有限公司 | X70 steel grade large-caliber thin-wall hot-expanding seamless steel pipe and production method thereof |
| CN115090710B (en) * | 2022-07-01 | 2024-06-21 | 衡阳华菱钢管有限公司 | P92 seamless steel tube and preparation method and application thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906691A (en) * | 1996-07-02 | 1999-05-25 | The Timken Company | Induction hardened microalloy steel having enhanced fatigue strength properties |
| CN101033524A (en) * | 2007-04-16 | 2007-09-12 | 唐山钢铁股份有限公司 | Hot-rolled sheet strip steel for thread gluing resistant straight welding petroleum oil line and producing method thereof |
| CN101270438A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method |
| CN102703838A (en) * | 2012-05-28 | 2012-10-03 | 无锡西姆莱斯石油专用管制造有限公司 | Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes |
-
2014
- 2014-07-11 CN CN201410329561.6A patent/CN104087826B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5906691A (en) * | 1996-07-02 | 1999-05-25 | The Timken Company | Induction hardened microalloy steel having enhanced fatigue strength properties |
| CN101270438A (en) * | 2007-03-23 | 2008-09-24 | 宝山钢铁股份有限公司 | Normalized steel for resistance welding petroleum case pipe with low yield ratio, resistance welding casing tube and its manufacturing method |
| CN101033524A (en) * | 2007-04-16 | 2007-09-12 | 唐山钢铁股份有限公司 | Hot-rolled sheet strip steel for thread gluing resistant straight welding petroleum oil line and producing method thereof |
| CN102703838A (en) * | 2012-05-28 | 2012-10-03 | 无锡西姆莱斯石油专用管制造有限公司 | Production process for PSL-2 grade non-tempered N80 steel grade oil casing pipes |
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Address after: 421001 Henggang Industrial Park, 10 Dali new village, Hengyang, Hunan Patentee after: HENGYANG HONGDA SPECIAL STEEL TUBE Co.,Ltd. Address before: 421001 Henggang Industrial Park, 10 Dali new village, Hengyang, Hunan Patentee before: HENGYANG HONGDA SPECIAL STEEL PIPE Co.,Ltd. |
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