CN1312006C - High-impact electric welding steel pipe - Google Patents
High-impact electric welding steel pipe Download PDFInfo
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- CN1312006C CN1312006C CNB031566898A CN03156689A CN1312006C CN 1312006 C CN1312006 C CN 1312006C CN B031566898 A CNB031566898 A CN B031566898A CN 03156689 A CN03156689 A CN 03156689A CN 1312006 C CN1312006 C CN 1312006C
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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
- C22C38/02—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
- C22C38/002—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
- C22C38/14—Ferrous alloys, e.g. steel alloys containing titanium or zirconium
-
- 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/008—Martensite
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
本发明提供强度和韧性优良，而且在缝焊接部附近的韧性不会降低的高耐冲击性电焊钢管，即提供一种具有拉伸强度为1700MPa以上的高强度、横截面形状为圆型或方型的高耐冲击性电焊钢管，通过将钢中存在的Si量控制在(Mn/8)-0.07～(Mn/8)+0.07的范围内，而提高焊接部的韧性。其组成的是，在钢中以质量比计含有如下的必要成分：C：0.22～0.35%、Si：0.10～0.30%、Mn：0.5～1.50%、P：0.025%以下，S：0.01%以下、Al：0.010～0.050%、B：2～35ppm、Ti：0.005～0.05%。优选的是，通过高频淬火得到95%以上的马氏体组织，且残留奥氏体粒度号码为6号以上。The present invention provides a high-impact electric-welded steel pipe that is excellent in strength and toughness and does not decrease in toughness near the seam weld, that is, provides a high-strength steel pipe with a tensile strength of 1,700 MPa or more and a circular or square cross-sectional shape. Type high impact resistance electric welded steel pipe, by controlling the amount of Si present in the steel in the range of (Mn/8)-0.07～(Mn/8)+0.07, the toughness of the welded part is improved. Its composition is that the steel contains the following essential components in terms of mass ratio: C: 0.22-0.35%, Si: 0.10-0.30%, Mn: 0.5-1.50%, P: 0.025% or less, S: 0.01% or less , Al: 0.010-0.050%, B: 2-35ppm, Ti: 0.005-0.05%. Preferably, more than 95% of the martensite structure is obtained by induction quenching, and the grain size number of the retained austenite is 6 or more.
Description
Technical field
The present invention relates to as arrangements for automotive doors bumper material, bumper/spoiler reinforcement is that shape of cross section is round or square style high-impact electric welded steel pipe (an electricity seam steel pipe) with impact absorbing members such as materials.It is circular steel pipe that the semanteme of steel pipe typically refers to cross-sectional plane, but is meant that in this manual shape of cross section is round or square style steel pipe.Here so-calledly roundly comprise circle, ellipse etc., and square not only comprises polygons such as triangle, quadrangle, pentagon, but also comprise the fitfull shape of cross section.
Background technology
For for the employed high strength electric welded steel pipe of parts (electricity seam steel pipe) of the impact bending of arrangements for automotive doors bumper material etc., except intensity, also requirement can be controlled the toughness of absorption ability for impact energy naturally., open as shown in the flat 7-18374 communique for this reason, carried out various development researches at improving above-mentioned characteristic all the time as the spy.But existing product as a rule, near the seam welding portion that is used for electric welded steel pipe (electricity seam steel pipe) manufacturing, the tendency that reduces intensity or toughness arranged.
Summary of the invention
The purpose of this invention is to provide a kind of above-mentioned existing issue point that solved, the not only intensity of base portion and good-toughness, and near the high-impact electric welded steel pipe (electricity seam steel pipe) that can not reduce of the toughness seam welding portion.
The present inventor in order to achieve the above object, near the pendulum the opposite joint weld part absorbs energy response to be measured, and found that at pendulum to absorb on the broken out section that energy response reduces part, the residual S that contains
1, Mn oxide, learn that thus these compositions are reasons that toughness reduces.Confirmed subsequently, when satisfying specific the relation between Si and the Mn, can prevent that near the toughness weld part from reducing.
Based on above-mentioned opinion, it is round or square style high-impact electric welded steel pipe (electricity seam steel pipe) that purport of the present invention provides a kind of shape of cross section, it is characterized in that, having pulling strengrth is the above high strength of 1700Mpa, and the Si that exists in steel amount is controlled in the scope of (Mn/8)-0.07～(Mn/8)+0.07.Particularly preferably be, in steel, contain following neccessary composition: C:0.22～0.35%, Si:0.10～0.30%, Mn:0.5～1.50% by quality ratio, below the P:0.025%, below the S:0.01%, Al:0.010～0.050%, B:2～35ppm, Ti:0.005～0.05%.
And, in steel, can also contain any composition of from following material group, selecting by quality ratio: Nb:0.005～0.050%, V:0.005～0.070%, Cu:0.005～0.5%, Cr:0.005～0.5%, Mo:0.1～0.5%, Ni:0.1～0.5%, below the Ca:0.01%, rare earth element (REM): below 0.1%.And then it obtains martensitic stucture more than 95% by electro-high-frequency hardening, and retained austenite granularity number is for desirable more than No. 6.
As mentioned above, the oxide that contains Si, Mn that produces in seam welding portion is considered to make the reason that the toughness of weld part reduces.In the present invention, by the Si amount is controlled in the scope of (Mn/8)-0.07～(Mn/8)+0.7, above-mentioned oxide can be discharged from seam welding portion, thus as described later shown in the data among the embodiment, can keep the above high tensile of 1700Mpa, and can prevent fully that the toughness of weld part from reducing.
Description of drawings
Fig. 1 is the figure of the toughness measurement result of expression upsetting weld part.
The figure of the relation whether Fig. 2 breaks when being expression retained austenite granularity and impact bend test.
The specific embodiment
Shape of cross section of the present invention is that round or square style high-impact electric welded steel pipe (electricity seam steel pipe) is the electric welded steel pipe of being made by the steel that has added C and Mn (electricity seam steel pipe), by making austenite structure become martensitic stucture this steel pipe quenching, reach the above pulling strengrth of 1700Mpa.Its basic constituent is, in steel, contain C:0.22～0.35%, Si:0.10～0.30%, Mn:0.5～1.50% by quality ratio, below the P:0.025%, below the S:0.01%, Al:0.010～0.050%, B:2～35ppm, Ti:0.005～0.05% is as neccessary composition.
Below at first the reason of the numerical definiteness of each composition in the basic composition is described.
Thereby C is used to strengthen the essential composition that martensite itself improves hardness, and in order to obtain the pulling strengrth more than the 1700Mpa, C is necessary at least 0.22%.But when C was excessive, martensitic stucture became fragile, and caused hardening crack to destroy when quenching, so C should be below 0.35%.
Si, Mn, Ti promote the composition of austenite to martensitic phase transformation when quenching, if after a little while than each numerical definiteness scope of Si:0.10～0.30%, Mn:0.5～1.50%, Ti:0.005～0.05%, hardenability reduces and produces retained austenite or residual double carbide, can not get desired material behavior.On the contrary, if surpass above-mentioned numerical definiteness scope, can cause hardening crack or segregation, be worthless therefore.Particularly preferably be,, when improving the weld part intensity ratio, the Mn amount be set to than low value for better, preferably less than 1.4% in order to improve the reliability of weld part.In addition, Ti has the effect that improves hardenability by fix N.
B suppresses the composition that double carbide is separated out, but when being combined into BN with the N that comprises as gas componant in steel, loses its effect, therefore the B amount is set at more than the 2ppm.But when surpassing 35ppm, become the segregation inclusion.P and S become the segregation inclusion will make that martensitic stucture becomes fragile, and therefore must set below the P:0.025%, below the S:0.02%.Al is a deoxidation reagent, if be discontented with 0.010%, then deoxidation effect is insufficient; And if surpass 0.050%, then its oxide has become inclusion between crystal, is worthless therefore.
Except the essential composition of above explanation, can also contain any composition of from following material group, selecting: Nb:0.005～0.050%, V:0.005～0.070%, Cu:0.005～0.5%, Cr:0.005～0.5%, Mo:0.1～0.5%, Ni:0.1～0.5%, below the Ca:0.01%, rare earth element (REM): below 0.1%.
Nb and V generate precipitate and have hindered passing through of dislocation in martensitic stucture, they are precipitation strength compositions that intensity is improved thus.Cu, Cr, Mo and Ni solid solution and hindered passing through of dislocation in the martensite crystal, they are solution hardening compositions that intensity is improved thus.In addition, Cr and Mo also play a part the precipitation strength composition.These compositions can be gained in strength, but excessive interpolation not only causes cost and raises, and become the segregation inclusion, so Nb:0.005～0.050%, V:0.005～0.070%, Cu:0.005～0.5%, Cr:0.005～0.5%, Mo:0.1～0.5% and Ni:0.1～0.5%th suit.
Ca and rare earth element (REM) are the compositions of form of control inclusion, but excessive interpolation can cause the deletrious segregation relevant with the destruction of martensitic stucture, thus below the Ca:0.01% and rare earth element (REM) be 0.1% to suit.As rare earth element (REM), for example can use Y, La, Ce and Sm.
As mentioned above, high-impact electric welded steel pipe of the present invention (electricity seam steel pipe) must contain Si:0.10～0.30%, Mn:0.5～1.50% in order to promote from austenite to Martensite Transformation, and to reach pulling strengrth be the above high strength of 1700Mpa.In addition, make them satisfy in the scope of (Mn/8)-0.07≤Si≤(Mn/8)+0.07, aspect the toughness reduction that prevents seam welding portion be maximum feature thus by control Si and Mn.Fig. 1 is the figure of the toughness measurement result of expression upsetting weld part, when the Si amount is in above-mentioned scope, confirms that relative pendulum absorbs energy and becomes maximum.
In addition, relatively pendulum absorbs energy and is, is the endergonic relative value of pendulum of composition of Si=(Mn/8)+α (α=-0.30～+ 0.30) of 1 o'clock with the pendulum absorption energy settings of the composition of-40 ℃ of Si=Mn/8 down.
As shown in the present, interpolation C and Mn are low than low intensive steel pipe fusing point with the steel pipe that reaches the high strength more than the 1700Mpa in steel, and the viscosity of the oxide that the surface of melt metal generated when electric seam welding connect is lower.For this reason, control the Si amount that the oxide residual quantity to weld part exerts an influence as mentioned above and get rid of oxide, it is believed that this reduces the toughness that prevents weld part is particular importance.
In addition, the martensitic stucture and the retained austenite granularity number that obtain more than 95% by electro-high-frequency hardening are more than No. 6, and this is to guaranteeing that low-temperature impact curved characteristic aspect is preferred.Fig. 2 is that expression is carried out impact bend test to the different high-impact electric welded steel pipe (pulling strengrth 1700MPa) of retained austenite granularity, the result's that observing breaks takes place figure.As can be known, be fine crystal more than No. 6 by carrying out retained austenite granularity number, then obtain the good steel pipe of low-temperature impact curved characteristic.In addition, the miniaturization of crystallization, for example the low temperatureization of quenching temperature, quench before the grain refined of tissue, the effect of the interpolation element by Nb, V, Ti etc. is in the cards.
The retained austenite granulometry is manifested retained austenite grain circle that liquid shows mother metal by normally used austenite grain circle after, gets final product with the process of chopping or visual analysis method.
Moreover, shape of cross section can be round or square style any one.
Cross-sectional plane is that the manufacture method of square style square steel tube has: electric seam welding uses forming rolls to carry out the method for rib shaping after connecing operation, bends the method that is shaped and carries out the rib shaping when electric seam welding connects from steel band continuously.
In the latter case, it is believed that, because make the superhigh intensity material, when thickness of slab is designed to approach, the upsetting amount when being difficult to guarantee to weld, the residual danger of oxide uprises.But, even in this case, by the Si that the oxide residual quantity exerts an influence being measured, can get rid of oxide in the present invention as above-mentioned control, make welding quality stable, so avoided the toughness of weld part to reduce.
When absorbing impact energy, it is believed that the load ratio of rib portion big to the load of planar portions in distortion such as car door bumper/spoiler.Relative therewith, before employing, during a kind of manufacture method, before by forming rolls, check weld part, make weld part can not arrive rib portion.And after employing a kind of manufacture method, bend and be shaped and realize that the angle is shaped, so weld part can not arrive rib portion.Like this, can positively make the bight outside weld part, can give full play to the high-energy absorption performance of mother metal.In addition, by being configured as square steel pipe, can make that also the cross-sectional plane coefficient of round steel pipe of its cross-sectional plane coefficient ratio same cross-sectional area is big.Therefore, it is believed that the present invention is that square style steel pipe can further improve energy absorption capacity than round steel pipe by adopting cross-sectional plane, can improve reliability.
Embodiment 1
Make the electric welded steel pipe (electricity seam steel pipe) of the various compositions shown in the table 1, measure the ratio of the pulling strengrth of pulling strengrth, weld part intensity/base portion, low-temperature impact has crack-free etc. when crooked, remembers in table.And the value of α=Si-Mn/8 and retained austenite granularity number are also remembered in table.Embodiment 1～5 and comparative example 1～3rd, round electric welded steel pipe (electricity seam steel pipe), embodiment 6,7 and comparative example 4 are square electric welded steel pipes (electricity seam steel pipe) of square cross section.
Table 1
| Embodiment 1 | Embodiment 2 | Embodiment 3 | Embodiment 4 | Embodiment 5 | Embodiment 6 | Embodiment 7 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | ||
| C | 0.24 | 0.28 | 0.28 | 0.30 | 0.33 | 0.28 | 0.30 | 0.30 | 0.30 | 0.30 | 0.30 | |
| Si | 0.15 | 0.24 | 0.13 | 0.20 | 0.20 | 0.14 | 0.15 | 0.10 | 0.30 | 0.30 | 0.35 | |
| Mn | 1.41 | 1.43 | 1.25 | 1.43 | 1.44 | 1.30 | 1.35 | 1.50 | 1.00 | 1.00 | 1.00 | |
| P | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | 0.02 | |
| S | 0.005 | 0.005 | 0.005 | 0.005 | 0.005 | 0.005 | 0.003 | 0.005 | 0.005 | 0.005 | 0.005 | |
| Al | 0.028 | 0.023 | 0.026 | 0.022 | 0.029 | 0.025 | 0.025 | 0.024 | 0.022 | 0.022 | 0.026 | |
| B | 13 | 12 | 10 | 14 | 11 | 12 | 14 | 10 | 13 | 13 | 13 | |
| Ti | 0.025 | 0.026 | 0.024 | 0.024 | 0.025 | 0.024 | 0.025 | 0.026 | 0.026 | 0.026 | 0.027 | |
| Nb | 0.03 | 0.03 | ||||||||||
| V | 0.03 | 0.03 | ||||||||||
| Ni | 0.03 | |||||||||||
| Cr | 0.15 | 0.13 | 0.15 | |||||||||
| Cu | ||||||||||||
| REM | ||||||||||||
| Ca | 0.03 | |||||||||||
| α | -0.03 | +0.06 | -0.03 | +0.02 | +0.02 | -0.02 | -0.02 | -0.09 | +0.18 | +0.18 | +0.23 | |
| The granularity number | 7 | 6 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 5 | 7 | |
| Intensity | 1861 | 1908 | 1911 | 1995 | 2125 | 1925 | 2015 | 2005 | 1992 | 1907 | 1985 | |
| The weld part intensity ratio | 1.2 | 1.3 | 1.8 | 1.4 | 1.3 | 1.2 | 1.3 | 0.5 | 0.4 | 0.4 | 0.4 | |
| The low-temperature impact bending | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | ○ | × | × | |
In addition, the composition in the table is that remaining content is Fe and unavoidable impurities in quality % (but only B is in ppm); Zero of the crooked hurdle of low-temperature impact is meant and do not break when carrying out impact bend test under-60 ℃ the cryogenic conditions, and * be meant and break.Intensity is pulling strengrth, and its unit is Mpa.And component content does not add for blank being meant.
Especially, for embodiment 3, so Mn quantity not sufficient 1.4% is than the weld part intensity ratio height among other the embodiment of round steel pipe.
And though do not illustrate in the table, the impact absorption energy of the maximum of embodiment 6,7 is bigger than embodiment 1～5.Think that this is because the big cause of cross-sectional plane coefficient.
Like this, shape of cross section of the present invention is not only intensity and a good-toughness of round or square style high-impact electric welded steel pipe (electricity seam steel pipe), and near the intensity seam welding portion and toughness do not reduce, suitable as arrangements for automotive doors bumper material, bumper/spoiler reinforcement with impact absorbing members such as materials.
Claims (3)
1, a kind of shape of cross section is round or square style high-impact electric welded steel pipe, it has pulling strengrth is the above high strength of 1861MPa, and this steel pipe is characterised in that: in steel, contain following neccessary composition: C:0.22～0.35%, Si:0.10～0.30%, Mn:1.25～1.50% by quality ratio, below the P:0.025%, below the S:0.01%, Al:0.010～0.050%, B:2～35ppm, Ti:0.005～0.05%; And the Si that exists in steel amount is controlled in the scope of (Mn/8)-0.07～(Mn/8)+0.07.
2, shape of cross section according to claim 1 is round or square style high-impact electric welded steel pipe, it is characterized in that, in steel, also contain any composition of from following material group, selecting by quality ratio: Nb:0.005～0.050%, V:0.005～0.070%, Cu:0.005～0.5%, Cr:0.005～0.5%, Mo:0.1～0.5%, Ni:0.1～0.5%, below the Ca:0.01%, rare earth element: below 0.1%.
3, shape of cross section according to claim 1 is round or square style high-impact electric welded steel pipe, and it obtains martensitic stucture more than 95% by electro-high-frequency hardening, and retained austenite granularity number is more than No. 6.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP374010/2002 | 2002-12-25 | ||
| JP2002374010A JP2003328082A (en) | 2002-03-08 | 2002-12-25 | High impact resistance ERW steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1509922A CN1509922A (en) | 2004-07-07 |
| CN1312006C true CN1312006C (en) | 2007-04-25 |
Family
ID=32588432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031566898A Expired - Fee Related CN1312006C (en) | 2002-12-25 | 2003-09-05 | High-impact electric welding steel pipe |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100563998B1 (en) |
| CN (1) | CN1312006C (en) |
| CA (1) | CA2441720C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103952640B (en) * | 2014-04-26 | 2017-03-15 | 广东韶钢松山股份有限公司 | A kind of 35MnB steel and preparation method thereof |
| CN104117824A (en) * | 2014-07-22 | 2014-10-29 | 上海加宁新技术研究所 | Manufacturing method of super high pressure seamless alloy steel pipe |
| KR101665819B1 (en) | 2014-12-24 | 2016-10-13 | 주식회사 포스코 | Steel material for heat treating, formed component having extra high strength and high fatigue resistance and method for manufacturing the formed component |
| US10961599B2 (en) | 2016-07-20 | 2021-03-30 | Hyundai Motor Company | Lightweight door beam, composition thereof and method of manufacturing the same |
| CN106929772B (en) * | 2017-03-14 | 2019-04-23 | 河北工业大学 | Steel for steel bar, preparation method of steel and steel bar |
| CN113308648B (en) * | 2021-05-14 | 2022-11-15 | 唐山钢铁集团高强汽车板有限公司 | Cold-rolled martensite steel substrate and production method thereof |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06179945A (en) * | 1992-12-15 | 1994-06-28 | Nippon Steel Corp | Cr-Mo super high strength ERW steel pipe with excellent ductility |
| US5374322A (en) * | 1992-07-09 | 1994-12-20 | Sumitomo Metal Industries, Ltd. | Method of manufacturing high strength steel member with a low yield ratio |
| JPH10306339A (en) * | 1997-04-30 | 1998-11-17 | Kawasaki Steel Corp | High toughness and high ductility steel material and manufacturing method thereof |
| JPH1150148A (en) * | 1997-08-06 | 1999-02-23 | Sumitomo Metal Ind Ltd | Manufacturing method of high strength and high corrosion resistant seamless steel pipe |
| JPH11310822A (en) * | 1998-04-30 | 1999-11-09 | Nippon Steel Corp | Manufacturing method of high strength martensitic stainless steel pipe with excellent low temperature toughness |
| JP2000219933A (en) * | 1999-02-01 | 2000-08-08 | Nippon Steel Corp | High-strength steel pipe with excellent hydraulic formability |
| JP2001262275A (en) * | 2000-03-22 | 2001-09-26 | Nippon Steel Corp | High tension seamless steel pipe excellent in toughness, ductility, and weldability and method for producing the same |
-
2003
- 2003-09-03 KR KR1020030061448A patent/KR100563998B1/en not_active Expired - Fee Related
- 2003-09-05 CN CNB031566898A patent/CN1312006C/en not_active Expired - Fee Related
- 2003-09-19 CA CA002441720A patent/CA2441720C/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5374322A (en) * | 1992-07-09 | 1994-12-20 | Sumitomo Metal Industries, Ltd. | Method of manufacturing high strength steel member with a low yield ratio |
| JPH06179945A (en) * | 1992-12-15 | 1994-06-28 | Nippon Steel Corp | Cr-Mo super high strength ERW steel pipe with excellent ductility |
| JPH10306339A (en) * | 1997-04-30 | 1998-11-17 | Kawasaki Steel Corp | High toughness and high ductility steel material and manufacturing method thereof |
| JPH1150148A (en) * | 1997-08-06 | 1999-02-23 | Sumitomo Metal Ind Ltd | Manufacturing method of high strength and high corrosion resistant seamless steel pipe |
| JPH11310822A (en) * | 1998-04-30 | 1999-11-09 | Nippon Steel Corp | Manufacturing method of high strength martensitic stainless steel pipe with excellent low temperature toughness |
| JP2000219933A (en) * | 1999-02-01 | 2000-08-08 | Nippon Steel Corp | High-strength steel pipe with excellent hydraulic formability |
| JP2001262275A (en) * | 2000-03-22 | 2001-09-26 | Nippon Steel Corp | High tension seamless steel pipe excellent in toughness, ductility, and weldability and method for producing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20040057897A (en) | 2004-07-02 |
| CA2441720A1 (en) | 2004-06-25 |
| KR100563998B1 (en) | 2006-03-29 |
| CA2441720C (en) | 2009-12-15 |
| CN1509922A (en) | 2004-07-07 |
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