CA2441720A1 - Highly impact-resistant steel pipe and method for producing the same - Google Patents
Highly impact-resistant steel pipe and method for producing the same Download PDFInfo
- Publication number
- CA2441720A1 CA2441720A1 CA002441720A CA2441720A CA2441720A1 CA 2441720 A1 CA2441720 A1 CA 2441720A1 CA 002441720 A CA002441720 A CA 002441720A CA 2441720 A CA2441720 A CA 2441720A CA 2441720 A1 CA2441720 A1 CA 2441720A1
- Authority
- CA
- Canada
- Prior art keywords
- steel pipe
- highly impact
- tensile strength
- resistant
- resistant steel
- 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.)
- Granted
Links
Classifications
-
- 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
Abstract
The present invention provides: a highly impact-resistant member having a round or square sectional shape, that is excellent in strength and toughness, does not undergo the deterioration of toughness in the vicinity of the welded portion, and a highly impact-resistant steel pipe having a tensile strength TS of 1,700 MPa or more and a yield ratio YR of 72% or less, said yield ratio being the ratio of a 0.1%-proof stress YS to a tensile strength TS (YS/TS). The toughness of the welded portion of said steel pipe is enhanced by controlling the Si amount in the steel of said steel pipe in the range from Mn/8 - 0.07 to Mn/8 + 0.07. Said steel contains, in mass, 0.19 to 0.35% C, 0.10 to 0.30 Si, 0.5 to 1.60 Mn, not more than 0.025 P, not more than 0.01 S, 0.010 to 0.050 Al, 2 to 35 ppm B and 0.005 to 0.05 Ti as indispensable components. Said steel pipe according to the present invention comprises a steel wherein 95% or more of the microstructure of said steel is transformed into martensite by subjecting said steel pipe to induction heating and then water quenching at a cooling rate of 100.degree.C or higher and the prior austenite grain size number of said steel is #6 or more. The present invention includes methods for producing said steel pipe.
Claims (13)
1. A highly impact-resistant steel pipe characterized in that: the tensile strength TS of said steel pipe is 1,700 MPa or more; and the YR thereof, said YR being the ratio of the 0.1%-proof stress YS to said tensile strength TS (YS/TS), is 72% or less.
2. A highly impact-resistant steel pipe characterized in that: the tensile strength TS of said steel pipe is 1,800 MPa or more; and the YR thereof, said YR being the ratio of the 0.1%-proof stress YS to said tensile strength TS (YS/TS), is 70% or less.
3. A highly impact-resistant steel pipe characterized in that: the tensile strength TS of said steel pipe is 1,900 MPa or more; and the YR thereof, said YR being the ratio of the 0.1%-proof stress YS to said tensile strength TS (YS/TS), is 68% or less.
4. A highly impact-resistant steel pipe characterized in that: the tensile strength TS of said steel pipe is 2,000 MPa or more; and the YR thereof, said YR being the ratio of the 0.1%-proof stress YS to said tensile strength TS (YS/TS), is 66% or less.
5. A highly impact-resistant electric-resistance-welded steel pipe characterized in that: the tensile strength TS of said steel pipe is 1,700 MPa or more; and the Si amount in the steel of said steel pipe is controlled in the range from Mn/8 - 0.07 to Mn/8 + 0.07 (mass %).
6. A highly impact-resistant steel pipe according to any one of claims 1 to 4, characterized in that the dislocation density of said steel pipe is in the range from 10 10 to 10 14 /mm-2.
7. A highly impact-resistant steel pipe according to any one of claims 1 to 5, characterized in that the steel of said steel pipe contains, in mass, 0.19 to 0.35%
C, 0.10 to 0.30% Si, 0.5 to 1.60% Mn, not more than 0.025% P, not more than 0.01% S, 0.010 to 0.05% Al, 2 to 35 ppm B, and 0.005 to 0.05% Ti as indispensable components.
C, 0.10 to 0.30% Si, 0.5 to 1.60% Mn, not more than 0.025% P, not more than 0.01% S, 0.010 to 0.05% Al, 2 to 35 ppm B, and 0.005 to 0.05% Ti as indispensable components.
8. A highly impact-resistant steel pipe according to claim 7, characterized in that the steel of said steel pipe further contains, in mass, one or more components selected from among the group of 0.005 to 0.050% Nb, 0.005 to 0.070% V, 0.005 to 0.5% Cu, 0.1 to 0.5% Mo, 0.1 to 0.5% Ni, not more than 0.01% Ca, and not more than 0.1% rare earth metals (REMs).
9. A highly impact-resistant steel pipe according to any one of claims 1 to 5, characterized in that 95% or more of the microstructure of said steel pipe is transformed into martensite by induction hardening and the prior austenite grain size number of said steel pipe is #6 or more.
10. A highly impact-resistant steel pipe according to any one of claims 1 to 5, characterized in that said steel pipe has a round or square sectional shape.
11. A method for producing a highly impact-resistant steel pipe according to any one of claims 1 to 5, characterized in that said steel pipe containing, in mass, 0.19 to 0.35% C, 0.10 to 0.30% Si, 0.5 to 1.60% Mn, not more than 0.025% P, not more than 0.01% S, 0.010 to 0.050% Al, 2 to 35 ppm B, and 0.005 to 0.05% Ti as indispensable components, and further one or more components selected from among the group of 0.005 to 0.050% Nb, 0.005 to 0.070% V, 0.005 to 0.5% Cu, 0.1 to 0.5% Mo, 0.1 to 0.5% Ni, not more than 0.01% Ca, and not more than 0.1% rare earth metals (REMs), is subjected to induction heating and then water quenching.
12. A method for producing a highly impact-resistant steel pipe according to claim 11, characterized in that the cooling rate of said water quenching is 100°C/sec. or higher.
13. A method for producing a highly impact-resistant steel pipe according to claim 11 or 12, characterized in that the cooling water temperature of said water quenching is 35°C or lower.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002-374010 | 2002-12-25 | ||
| JP2002374010A JP2003328082A (en) | 2002-03-08 | 2002-12-25 | Electroseamed steel pipe with high impact resistance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2441720A1 true CA2441720A1 (en) | 2004-06-25 |
| CA2441720C CA2441720C (en) | 2009-12-15 |
Family
ID=32588432
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002441720A Expired - Fee Related CA2441720C (en) | 2002-12-25 | 2003-09-19 | Highly impact-resistant steel pipe and method for producing the same |
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 | A kind of Steel Bar and preparation method thereof and rod iron |
| 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 |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0681078A (en) * | 1992-07-09 | 1994-03-22 | Sumitomo Metal Ind Ltd | Low yield ratio high strength steel and its production |
| JPH06179945A (en) * | 1992-12-15 | 1994-06-28 | Nippon Steel Corp | Cr-mo series ultrahigh tensile strength electric resistance welded steel tube excellent in ductility |
| JP3683378B2 (en) * | 1997-04-30 | 2005-08-17 | Ｊｆｅスチール株式会社 | Manufacturing method of high toughness and high ductility steel pipe |
| JPH1150148A (en) * | 1997-08-06 | 1999-02-23 | Sumitomo Metal Ind Ltd | Production of high strength and high corrosion resistance seamless steel pipe |
| JP3921808B2 (en) * | 1998-04-30 | 2007-05-30 | 住友金属工業株式会社 | High-strength martensitic stainless steel pipe with excellent low-temperature toughness and manufacturing method thereof |
| JP3563988B2 (en) * | 1999-02-01 | 2004-09-08 | 新日本製鐵株式会社 | High-strength steel pipe with excellent hydraulic formability |
| JP4288441B2 (en) * | 2000-03-22 | 2009-07-01 | 住友金属工業株式会社 | High-strength seamless steel pipe excellent in toughness, ductility, and weldability and method for producing the same |
-
2003
- 2003-09-03 KR KR1020030061448A patent/KR100563998B1/en active IP Right Grant
- 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
Also Published As
| Publication number | Publication date |
|---|---|
| CA2441720C (en) | 2009-12-15 |
| CN1312006C (en) | 2007-04-25 |
| KR100563998B1 (en) | 2006-03-29 |
| KR20040057897A (en) | 2004-07-02 |
| CN1509922A (en) | 2004-07-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20220322 |
|
| MKLA | Lapsed |
Effective date: 20200921 |