CA2254564A1 - Non-ridging ferritic chromium alloyed steel - Google Patents
Non-ridging ferritic chromium alloyed steelInfo
- Publication number
- CA2254564A1 CA2254564A1 CA002254564A CA2254564A CA2254564A1 CA 2254564 A1 CA2254564 A1 CA 2254564A1 CA 002254564 A CA002254564 A CA 002254564A CA 2254564 A CA2254564 A CA 2254564A CA 2254564 A1 CA2254564 A1 CA 2254564A1
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- steel
- annealed
- steel sheet
- cast
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/50—Ferrous alloys, e.g. steel alloys containing chromium with nickel with 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/021—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips involving a particular fabrication or treatment of ingot or slab
- C21D8/0215—Rapid solidification; Thin strip casting
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
A ferritic non-ridging stainless steel and process therefor. A chromium alloyed steel melt containing sufficient titanium and nitrogen but a controlled amount of aluminum is cast into an ingot or continuously cast into a strip or a slab having an as-cast fine equiaxed grain structure substantially free of columnar grains. The as-cast steel contains 0.08% C, at least about 8% Cr, up to 1.50% Mn, ~0.020% Al,~0.05% N, ~
1.5% Si, ~ 2.0% Ni, Ti ~0.10%, the ratio of (Ti x N)/Al ~0.14, all percentages by weight, the balance Fe and residual elements. Preferably, the titanium is controlled so that (Ti/48)/[(C/12) + (N/14)] ~ 1.5. A hot processed sheet may be formed from a continuously cast slab without grinding the surfaces of the slab. The hot processed sheet may be descaled, cold reduced to a final thickness and recrystallization annealed.
Annealing the hot processed sheet prior to cold reduction is not required to obtain an annealed sheet essentially free of ridging and having high formability.
1.5% Si, ~ 2.0% Ni, Ti ~0.10%, the ratio of (Ti x N)/Al ~0.14, all percentages by weight, the balance Fe and residual elements. Preferably, the titanium is controlled so that (Ti/48)/[(C/12) + (N/14)] ~ 1.5. A hot processed sheet may be formed from a continuously cast slab without grinding the surfaces of the slab. The hot processed sheet may be descaled, cold reduced to a final thickness and recrystallization annealed.
Annealing the hot processed sheet prior to cold reduction is not required to obtain an annealed sheet essentially free of ridging and having high formability.
Claims (27)
1. A chromium alloyed ferritic steel comprising:
~ 0.08% C, ~ 8% Cr, ~ 1.50% Mn, ~ 0.05% N, ~ 1.5% Si, ~ 2.0% Ni, Ti ~ 0.10%, a the ratio of (Ti x N)/Al ~ 0.14, all percentages by weight, the balance Fe and residual elements, and the steel deoxidized with titanium and having an as-cast structure ~ 50%
equiaxed grains.
~ 0.08% C, ~ 8% Cr, ~ 1.50% Mn, ~ 0.05% N, ~ 1.5% Si, ~ 2.0% Ni, Ti ~ 0.10%, a the ratio of (Ti x N)/Al ~ 0.14, all percentages by weight, the balance Fe and residual elements, and the steel deoxidized with titanium and having an as-cast structure ~ 50%
equiaxed grains.
2. A chromium alloyed ferritic steel sheet comprising:
~ 0.08% C, ~ 8% Cr, ~ 1.50% Mn, ~ 0.05% N, ~ 1.5% Si, ~ 2.0% Ni, Ti ~ 0.10%, the ratio of (Ti x N)/Al ~ 0.14, all percentages by weight, the balance Fe and residual elements, the sheet being recrystallization annealed and essentially free of ridging when formed into a part, the annealed sheet being cold reduced from a hot processed sheet, and the hot processed sheet formed from a steel deoxidized with titanium and having an as-cast structure ~ 50% equiaxed grains.
~ 0.08% C, ~ 8% Cr, ~ 1.50% Mn, ~ 0.05% N, ~ 1.5% Si, ~ 2.0% Ni, Ti ~ 0.10%, the ratio of (Ti x N)/Al ~ 0.14, all percentages by weight, the balance Fe and residual elements, the sheet being recrystallization annealed and essentially free of ridging when formed into a part, the annealed sheet being cold reduced from a hot processed sheet, and the hot processed sheet formed from a steel deoxidized with titanium and having an as-cast structure ~ 50% equiaxed grains.
3. The steel sheet of claim 2 wherein Ti ~ 0.15%.
4. The steel sheet of claim 3 wherein Ti and N are in sub-equilibrium amounts and Ti satisfies the relationship (Ti/48)/[(C/12) + (N/14)] ~ 1.5.
5. The steel sheet of claim 3 wherein N ~ 0.012% and Ti ~ 0.25%.
6. The steel sheet of claim 2 wherein the equiaxed grains have a sizw ~ 3 mm.
7. The steel sheet of claim 2 wherein the Al ~ 0.020%.
8. The steel sheet of claim 7 wherein the Al ~ 0.013%.
9. The steel sheet of claim 8 including a second stabilizing element from the group consisting of niobium, zirconium, tantalum and vanadiurn.
10. The steel sheet of claim 7 wherein O is 10-60 ppm.
11. The steel sheet of claim 2 including ~ 20 ppm B.
12. The steel sheet of claim 7 wherein the as-cast structure is 2 60% equiaxed grains.
13. The steel sheet of claim 8 wherein the as-cast structure is ~ 80% equiaxed grains.
14. The steel sheet of claim 2 wherein the ratio of (Ti x N)/Al ~ 0.23 and the as-cast structure is substantially free of columnar grains.
15. The steel sheet of claim 2 wherein the Al ~ 0.010, ratio of (Ti x N)/Al ~ 0.23 and the as-cast structure is substantially free of columnar grains.
16. The steel sheet of claim 2 wherein the as-cast steel has titanium oxide inclusions with a majority of the inclusions having a size ~1.5 µm.
17. The steel sheet of claim 2 wherein Cr ~ 16% and the ratio of (Ti x N)/Al ~ 0.30.
18 The steel sheet of claim 2 wherein the annealed sheet has an Rm value of ~ 1.4.
19. The steel sheet of claim 13 wherein the annealed sheet has an Rm value of ~ 1.7.
20. A chromium alloyed ferritic steel sheet comprising:
containing ~ 0.013% Al, 0.15-0.25% Ti, ~ 0.02% C, ~ 1.50 Mn, 0.005-0.012% N, ~
1.5% Si, 8-25% Cr, ~ 2.0% Ni, a sub-equilibrium amount of Ti, the ratio of (Ti xN)/Al ~ 0.16, all percentages by weight, the balance Fe and residual elements, the sheet being recrystallization annealed having an Rm value of ~ 1.4 and essentially free of ridging when formed into a part, the annealed sheet cold reduced from a hot processed sheet not previously annealed prior to the cold reduction, and the hot processed sheet formed from a steel deoxidized with titanium and having an as-cast structure ~ 80% equiaxed grains.
containing ~ 0.013% Al, 0.15-0.25% Ti, ~ 0.02% C, ~ 1.50 Mn, 0.005-0.012% N, ~
1.5% Si, 8-25% Cr, ~ 2.0% Ni, a sub-equilibrium amount of Ti, the ratio of (Ti xN)/Al ~ 0.16, all percentages by weight, the balance Fe and residual elements, the sheet being recrystallization annealed having an Rm value of ~ 1.4 and essentially free of ridging when formed into a part, the annealed sheet cold reduced from a hot processed sheet not previously annealed prior to the cold reduction, and the hot processed sheet formed from a steel deoxidized with titanium and having an as-cast structure ~ 80% equiaxed grains.
21. A process for making chromium alloyed steel, comprising the steps of:
providing a steel melt containing ~ 0.08% C, ~ 8% Cr, ~ 1.50% Mn, ~ 0.05% N, ~
1.5% Si, ~ 2.0% Ni, all percentages by weight, the balance Fe and residual elements, deoxidizing the melt with an amount of Ti satisfying the relationship (Ti xN)/Al ~ 0.14 and Ti ~ 0.10%, casting the melt into a steel having an as-cast structure ~ 50% equiaxed grains,hot processing the steel into a sheet, descaling the sheet, cold reducing the sheet to a final thickness, and recrystallization annealing the cold reduced sheet wherein the annealed sheet isessentially free of ridging when formed into a part.
providing a steel melt containing ~ 0.08% C, ~ 8% Cr, ~ 1.50% Mn, ~ 0.05% N, ~
1.5% Si, ~ 2.0% Ni, all percentages by weight, the balance Fe and residual elements, deoxidizing the melt with an amount of Ti satisfying the relationship (Ti xN)/Al ~ 0.14 and Ti ~ 0.10%, casting the melt into a steel having an as-cast structure ~ 50% equiaxed grains,hot processing the steel into a sheet, descaling the sheet, cold reducing the sheet to a final thickness, and recrystallization annealing the cold reduced sheet wherein the annealed sheet isessentially free of ridging when formed into a part.
22. The process of claim 21 wherein Al ~ 0.020%, Ti ~ 0.15%, (Ti x N)/Al ~ 0.23 and satisfies the relationship (Ti/48)/[(C/12) + (N/14)] ~ 1.5.
23. The process of claim 21 wherein the melt is continuously cast into a thin slab having a thickness ~ 140 mm, the additional step of reheating the slab to a temperature of 1050-1300°C prior to hot rolling the slab into the continuous sheet.
24. The process of claim 21 wherein the hot processed sheet is cold reduced without prior annealing.
25. The process of claim 24 wherein the hot processed sheet is cold reduced in a single stage.
26. The process of claim 21 wherein the cold reduced sheet is annealed at a temperature of 800-1000°C for at least 1 second.
27. A process for making chromium alloyed steel, comprising the steps of:
providing a steel melt containing ~ 0.013% Al, 0.15-0.25% Ti, ~ 0.02% C, ~ 1.50 Mn, 0.005-0.012% N, ~ 1.5% Si, 8-25% Cr, ~ 2.0% Ni, the ratio of (Ti x N)/Al ~
0.16 and (Ti/48)/[(C/12) + (N/l4)] ~ 1.5, a sub-equilibrium amount of Ti, all percentages by weight, the balance Fe and residual elements, casting the melt into a steel having an as-cast structure ~ 80% equiaxed grains,hot processing the steel into a sheet, descaling the sheet, cold reducing the sheet to a final thickness without prior annealing, and recrystallization annealing the cold reduced sheet wherein the annealed sheet isessentially free of ridging when formed into a part.
providing a steel melt containing ~ 0.013% Al, 0.15-0.25% Ti, ~ 0.02% C, ~ 1.50 Mn, 0.005-0.012% N, ~ 1.5% Si, 8-25% Cr, ~ 2.0% Ni, the ratio of (Ti x N)/Al ~
0.16 and (Ti/48)/[(C/12) + (N/l4)] ~ 1.5, a sub-equilibrium amount of Ti, all percentages by weight, the balance Fe and residual elements, casting the melt into a steel having an as-cast structure ~ 80% equiaxed grains,hot processing the steel into a sheet, descaling the sheet, cold reducing the sheet to a final thickness without prior annealing, and recrystallization annealing the cold reduced sheet wherein the annealed sheet isessentially free of ridging when formed into a part.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/994,382 | 1997-12-19 | ||
| US08/994,382 US5868875A (en) | 1997-12-19 | 1997-12-19 | Non-ridging ferritic chromium alloyed steel and method of making |
| US09/153,822 | 1998-09-15 | ||
| US09/153,822 US6855213B2 (en) | 1998-09-15 | 1998-09-15 | Non-ridging ferritic chromium alloyed steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2254564A1 true CA2254564A1 (en) | 1999-06-19 |
| CA2254564C CA2254564C (en) | 2012-07-10 |
Family
ID=26850893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2254564A Expired - Lifetime CA2254564C (en) | 1997-12-19 | 1998-11-27 | Non-ridging ferritic chromium alloyed steel |
Country Status (12)
| Country | Link |
|---|---|
| EP (1) | EP0924313B1 (en) |
| JP (1) | JP4388613B2 (en) |
| CN (1) | CN1088122C (en) |
| AR (1) | AR017437A1 (en) |
| AT (1) | ATE267886T1 (en) |
| BR (1) | BR9805348A (en) |
| CA (1) | CA2254564C (en) |
| DE (1) | DE69824131T2 (en) |
| DK (1) | DK0924313T3 (en) |
| ES (1) | ES2222549T3 (en) |
| RU (1) | RU2227172C2 (en) |
| TW (1) | TW496903B (en) |
Families Citing this family (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2811683B1 (en) | 2000-07-12 | 2002-08-30 | Ugine Savoie Imphy | FERRITIC STAINLESS STEEL FOR USE IN FERROMAGNETIC PARTS |
| FR2818290A1 (en) * | 2000-12-15 | 2002-06-21 | Ugine Savoie Imphy | Stainless steel for shaping by severe working and notably by cold striking or drawing into small diameter wires, with a controlled composition for selection of the type and dimensions of its inclusions |
| FR2818289B1 (en) * | 2000-12-15 | 2003-08-08 | Usinor | STAINLESS STEEL FOR SEVERE SHAPING AND IN PARTICULAR DEEP DRAWING OF A SHEET |
| JP3504655B2 (en) * | 2001-12-06 | 2004-03-08 | 新日本製鐵株式会社 | Ferritic stainless steel sheet excellent in press formability and workability and manufacturing method thereof |
| KR100729934B1 (en) * | 2005-12-28 | 2007-06-18 | 주식회사 포스코 | Method for manufacturing ferritic stainless steel slabs with equiaxed grain structures and the ferritic stainless steel manufactured by it |
| CN101008043B (en) * | 2006-01-27 | 2010-05-12 | 宝山钢铁股份有限公司 | Process for producing ferritic stainless steel |
| CN100430161C (en) * | 2006-12-27 | 2008-11-05 | 东北大学 | Cast rolling method and equipment of isometric crystal ferrite stainless steel slab band |
| US8852356B2 (en) * | 2009-03-11 | 2014-10-07 | Salzgitter Glachstahl GmbH | Method for producing a hot rolled strip and hot rolled strip produced from ferritic steel |
| WO2011036351A1 (en) | 2009-09-24 | 2011-03-31 | Arcelormittal Investigación Y Desarrollo Sl | Ferritic stainless steel having high drawability properties |
| CN102191366A (en) * | 2010-03-18 | 2011-09-21 | 宝山钢铁股份有限公司 | Manufacture method capable of improving patterns of common-type ferrite stainless steel plate |
| CN102140574B (en) * | 2011-05-11 | 2012-09-05 | 北京冶金正源科技有限公司 | Annealing process for improving deep drawability of 430 ferrite stainless steel |
| EP3283608B1 (en) * | 2015-04-17 | 2020-09-16 | The Curators of the University of Missouri | Grain refinement in iron-based materials |
| RU2615426C1 (en) * | 2015-12-03 | 2017-04-04 | Федеральное Государственное Унитарное Предприятие "Центральный научно-исследовательский институт черной металлургии им. И.П. Бардина" (ФГУП "ЦНИИчермет им. И.П. Бардина") | Method of producing hot-rolled high-strength corrosion-resistant steel |
| CN106834607B (en) * | 2017-01-19 | 2019-01-15 | 北京科技大学 | A kind of fining process improving ferrite stainless steel continuous casting billet proportion of equiaxed grain |
| CN112941399B (en) * | 2021-01-27 | 2022-06-21 | 浦项(张家港)不锈钢股份有限公司 | 409L stainless steel and preparation method thereof |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56123356A (en) * | 1980-03-01 | 1981-09-28 | Nippon Steel Corp | Ferritic stainless steel with superior formability |
| JPS5776127A (en) * | 1980-10-30 | 1982-05-13 | Nippon Steel Corp | Manufacture of ti containing ferrite system stainless steel sheet |
| EP0247264B1 (en) * | 1986-05-24 | 1992-07-22 | Nippon Steel Corporation | Method for producing a thin casting of cr-series stainless steel |
| US4834808A (en) * | 1987-09-08 | 1989-05-30 | Allegheny Ludlum Corporation | Producing a weldable, ferritic stainless steel strip |
| JPH06220545A (en) * | 1993-01-28 | 1994-08-09 | Nippon Steel Corp | Production of cr-series stainless steel thin strip excellent in toughness |
| JP3484805B2 (en) * | 1995-03-14 | 2004-01-06 | Ｊｆｅスチール株式会社 | Method for producing ferritic stainless steel strip with low in-plane anisotropy and excellent strength-elongation balance |
| JPH08296000A (en) * | 1995-04-24 | 1996-11-12 | Nippon Steel Corp | Ferritic stainless steel excellent in workability and corrosion resistance and its production |
| JPH08311543A (en) * | 1995-05-12 | 1996-11-26 | Nippon Steel Corp | Production of ferritic stainless steel having good glossiness and excellent in ridging resistance and formability |
| JP3357226B2 (en) * | 1995-08-14 | 2002-12-16 | 川崎製鉄株式会社 | Fe-Cr alloy with excellent ridging resistance and surface properties |
| US5851316A (en) * | 1995-09-26 | 1998-12-22 | Kawasaki Steel Corporation | Ferrite stainless steel sheet having less planar anisotropy and excellent anti-ridging characteristics and process for producing same |
| JP3446449B2 (en) * | 1996-02-20 | 2003-09-16 | Ｊｆｅスチール株式会社 | Ferritic stainless steel sheet with excellent ridging resistance |
| JP3684650B2 (en) * | 1996-02-29 | 2005-08-17 | Ｊｆｅスチール株式会社 | Method for producing Ti-containing ferritic stainless steel with excellent formability |
-
1998
- 1998-10-27 TW TW087117755A patent/TW496903B/en not_active IP Right Cessation
- 1998-11-27 CA CA2254564A patent/CA2254564C/en not_active Expired - Lifetime
- 1998-12-16 BR BR9805348-5A patent/BR9805348A/en not_active IP Right Cessation
- 1998-12-18 AR ARP980106516A patent/AR017437A1/en not_active Application Discontinuation
- 1998-12-18 CN CN98125446A patent/CN1088122C/en not_active Expired - Lifetime
- 1998-12-18 DK DK98124277T patent/DK0924313T3/en active
- 1998-12-18 ES ES98124277T patent/ES2222549T3/en not_active Expired - Lifetime
- 1998-12-18 DE DE69824131T patent/DE69824131T2/en not_active Expired - Lifetime
- 1998-12-18 AT AT98124277T patent/ATE267886T1/en not_active IP Right Cessation
- 1998-12-18 EP EP98124277A patent/EP0924313B1/en not_active Expired - Lifetime
- 1998-12-18 JP JP36090698A patent/JP4388613B2/en not_active Expired - Lifetime
- 1998-12-21 RU RU98123163/02A patent/RU2227172C2/en active
Also Published As
| Publication number | Publication date |
|---|---|
| TW496903B (en) | 2002-08-01 |
| EP0924313A1 (en) | 1999-06-23 |
| BR9805348A (en) | 1999-11-30 |
| DE69824131D1 (en) | 2004-07-01 |
| EP0924313B1 (en) | 2004-05-26 |
| ATE267886T1 (en) | 2004-06-15 |
| CN1224070A (en) | 1999-07-28 |
| DE69824131T2 (en) | 2005-06-02 |
| DK0924313T3 (en) | 2004-08-09 |
| RU2227172C2 (en) | 2004-04-20 |
| JPH11246944A (en) | 1999-09-14 |
| CN1088122C (en) | 2002-07-24 |
| AR017437A1 (en) | 2001-09-05 |
| JP4388613B2 (en) | 2009-12-24 |
| ES2222549T3 (en) | 2005-02-01 |
| CA2254564C (en) | 2012-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20181127 |