WO2001011096A1 - Improved bainitic steel - Google Patents
Improved bainitic steel Download PDFInfo
- Publication number
- WO2001011096A1 WO2001011096A1 PCT/GB2000/002914 GB0002914W WO0111096A1 WO 2001011096 A1 WO2001011096 A1 WO 2001011096A1 GB 0002914 W GB0002914 W GB 0002914W WO 0111096 A1 WO0111096 A1 WO 0111096A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- steel
- temperature
- microstructure
- carbon
- bainite
- Prior art date
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
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
-
- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/20—Isothermal quenching, e.g. bainitic hardening
-
- 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
- C21D1/78—Combined heat-treatments not provided for above
-
- 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
- C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
-
- 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
- C22C38/34—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium 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
- C21D2211/00—Microstructure comprising significant phases
- C21D2211/002—Bainite
-
- 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
Definitions
- the invention relates to a high carbon steel having good properties of strength hardness, and resistance to heat treatments. It also relates to a method of producing such steels.
- the inventors have determined a steel composition which has high hardness, high strength and high ductility and have further devised a method to produce such a steel.
- the invention comprised a steel having a composition by weight of carbon 0.6 to 1.1%, silicon 1.5 to 2.0%, manganese 1.8 to 4.0%>, nickel 0 to 3%, chromium 1.2 to 1.4%, molybdenum 0.2 to 0.5%, vanadium 0.1-0.2 %, balance iron save for incidental impurities.
- the steel may have incidental impurities which are not deliberate additions.
- the steel has the following composition in weight percent; carbon 0.7 to 0.9%; silicon 1.5 to 1.7%; manganese 1.9 to 2.2%; chromium 1.25 to 1.4%; nickel 0 to 0.05%; molybdenum 0.25 to 0.35%; vanadium 0.1 to 0.15%, balance iron save for incidental impurities.
- the steel is of mainly bainitic microstructure improving hardness, yield stress and ultimate tensile strength.
- Mainly bainitic microstructure is defined as at least 50%) of bainitic structure, preferably 65% and even more preferably 85% although 95%o is achievable.
- the rest of the structure comprises retained austenite.
- Figure 1 shows the microstructure showing a mixture martensite and austenite only, following a homogenisation heat treatment at 1200°C for two days.
- Figure 2 shows a microstructure of a steel according to the invention having a bainitic structure.
- Figure 3 shows hardness against three regimes of heat treatment.
- FIG. 4 shows a time - temperature - transformation (TTT) diagram of a steel according to the invention.
- Figures 5 and 6 show compression and tension curves for microstructure of the steel formed following isothermal transformation at 190°C for two weeks.
- Figure 7 shows the microstructure formed at 190°C for two weeks from as-cast material.
- Figure 1 shows the microstructure showing a mixture martensite and austenite only, following a homogenisation heat treatment at 1200°C for two days.
- Table 1 lists all the temperatures holding times and hardness values of the micro structures obtained after isothermal decomposition of austenite Temperature/ Time Hv (kgf/mm2) Temperature/ Time Hv (kgf/mm2) (weeks) (weeks)
- Figure 2 shows microstructure of the steel formed at 190°C for two weeks and shows a mixture of bainitic ferrite and carbon-enriched retained austenite.
- Figure 3 shows a plot of hardness against isothermal transformation temperature.
- the increase in hardness detected at 350°C after two weeks of isothermal treatment suggests that the start bainite temperature should be at this level.
- the microstructures formed at 150°, 350° and 400° are different from those obtained between 190°C and 300°C for two weeks and tempering at 400°C for an hour has shown that the 150°C and 400°C microstructures are martensite whereas the 190-300°C microstructures were bainite.
- a reduction the hardness after low temperature tempering usually confirms the presence of martensite instead of bainite in a microstructure.
- the microstructures formed at 450°C and 500°C are mixture of pearlite and retained austenite.
- the carbon composition of austenite after bainite transformation is much lower than expected from equilibrium and there is not significant enrichment of the residual austenite. This is because the carbide particles precipitate inside the plates of ferrite and lower bainite is formed instead of upper bainite.
- the carbides in the lower bainite should be extremely fine.
- the fine microstructure of lower bainite is expected to be much tougher than upper bainite in spite of fact that it should be stronger.
- the lower bainite structure is formed when isothermal transformation temperatures of up to around 350°C are used.
- the upper bainite structure is formed when isothermal transformation temperatures of over around 350°C are used.
- Figure 4 shows a schematic representation of the TTT diagram of the steel.
- Figures 5 and 6 show results of testing the compression and tension curves of samples which have been isothermally transformed at 190°C for two weeks to produce bainite.
- the material has very high strength under both compression and tension. Charpy tests in this cast and heat treated condition gave absorbed energy values of only 5+/- 1 J.
- FIG. 7 shows the microstructure obtained at 190°C for two weeks from fresh material; segregation is clear in the sample and the volume fraction of austenite appears to be higher. This microstructure was tested under compression and no significant difference from the yield strength estimated with homogenised sample was found. None the less toughness may be poorer because of the blocky austenite present in the dendrite microstructure.
- Samples are homogenised at 1200°C for two days and then isothermally transformed to pearlite or bainite before cooling to room temperature. Then reheated to 1000°C to refme austenite grain size and then transformed again to bainite.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Heat Treatment Of Articles (AREA)
- Heat Treatment Of Steel (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00949724A EP1200638B1 (en) | 1999-08-04 | 2000-08-02 | Method for producing an improved bainitic steel |
DE60028979T DE60028979T2 (en) | 1999-08-04 | 2000-08-02 | METHOD FOR PRODUCING AN IMPROVED BAINITIC STEEL |
US10/048,619 US6884306B1 (en) | 1999-08-04 | 2000-08-02 | Baintic steel |
JP2001515341A JP3751250B2 (en) | 1999-08-04 | 2000-08-02 | Improved bainite steel |
AU62999/00A AU6299900A (en) | 1999-08-04 | 2000-08-02 | Improved bainitic steel |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9918240A GB2352726A (en) | 1999-08-04 | 1999-08-04 | A steel and a heat treatment for steels |
GB9918240.4 | 1999-08-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001011096A1 true WO2001011096A1 (en) | 2001-02-15 |
Family
ID=10858469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB2000/002914 WO2001011096A1 (en) | 1999-08-04 | 2000-08-02 | Improved bainitic steel |
Country Status (8)
Country | Link |
---|---|
US (1) | US6884306B1 (en) |
EP (1) | EP1200638B1 (en) |
JP (1) | JP3751250B2 (en) |
AT (1) | ATE331051T1 (en) |
AU (1) | AU6299900A (en) |
DE (1) | DE60028979T2 (en) |
GB (1) | GB2352726A (en) |
WO (1) | WO2001011096A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010013054A2 (en) | 2008-07-31 | 2010-02-04 | The Secretary Of State For Defence | Bainite steel and methods of manufacture thereof |
WO2013117953A1 (en) * | 2012-02-10 | 2013-08-15 | Ascometal | Process for making a steel part, and steel part so obtained |
CN111566246A (en) * | 2018-01-11 | 2020-08-21 | 罗伯特·博世有限公司 | Component for contact with hydrogen |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5463662B2 (en) * | 2008-03-10 | 2014-04-09 | Jfeスチール株式会社 | Bearing steel excellent in rolling fatigue characteristics and manufacturing method thereof |
EP2268841A1 (en) | 2008-03-25 | 2011-01-05 | Aktiebolaget SKF | A bearing component |
US8066828B2 (en) * | 2008-06-18 | 2011-11-29 | Tata Consultancy Services, Ltd. | Method for efficient heat treatment of steel |
JP5463675B2 (en) * | 2009-01-30 | 2014-04-09 | Jfeスチール株式会社 | Bearing steel and manufacturing method thereof |
WO2011023988A2 (en) * | 2009-08-24 | 2011-03-03 | The Secretary Of State For Defence | Armour |
WO2012031771A1 (en) | 2010-09-09 | 2012-03-15 | Tata Steel Uk Limited | Super bainite steel and method for manufacturing it |
EP2834378B1 (en) * | 2012-04-04 | 2016-02-24 | Aktiebolaget SKF | Steel alloy |
CN103160667B (en) * | 2013-03-15 | 2014-04-02 | 武汉科技大学 | High-strength intermediate-carbon ultrafine bainitic steel and preparation method thereof |
CN103468906A (en) * | 2013-09-17 | 2013-12-25 | 北京科技大学 | Process for preparing 2000 MPa nano-scale bainitic steel through low temperature rolling |
PL228168B1 (en) | 2014-08-18 | 2018-02-28 | Politechnika Warszawska | Method for producing nanocrystalline structure in the bearing steel |
GB201604910D0 (en) * | 2016-03-23 | 2016-05-04 | Rolls Royce Plc | Nanocrystalline bainitic steels, shafts, gas turbine engines, and methods of manufacturing nanocrystalline bainitic steels |
SE544951C2 (en) * | 2021-06-29 | 2023-02-07 | Sandvik Materials Tech Emea Ab | A new super bainite steel, method for manufacturing an object of said steel and an object manufactured by the method |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3519497A (en) * | 1965-04-28 | 1970-07-07 | Lorraine Escaut Sa | Method for the thermal treatment of steel rails |
JPH0257637A (en) * | 1988-08-23 | 1990-02-27 | Nippon Steel Corp | Manufacture of spring with high fatigue strength and steel wire for spring for use therein |
JPH03215623A (en) * | 1990-01-19 | 1991-09-20 | Nisshin Steel Co Ltd | Production of tough high strength steel |
EP0849368A1 (en) * | 1996-12-19 | 1998-06-24 | Voest-Alpine Schienen GmbH | Shaped rolled product and method of making the same |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB399643A (en) * | 1931-09-30 | 1933-10-12 | Electro Metallurg Co | Improvements in alloy steel springs and spring blanks |
GB517118A (en) * | 1938-07-13 | 1940-01-22 | Ver Oberschlesische Huttenwerk | Improvements in and relating to improved steels and the application thereof |
US4957702A (en) * | 1988-04-30 | 1990-09-18 | Qinghua University | Air-cooling duplex bainite-martensite steels |
AU633737B2 (en) * | 1990-06-19 | 1993-02-04 | Nisshin Steel Company, Ltd. | Method of making steel for springs |
JPH04301031A (en) | 1991-03-29 | 1992-10-23 | Mazda Motor Corp | Steel member excellent in wear resistance and its production |
JPH05320749A (en) | 1992-05-20 | 1993-12-03 | Nisshin Steel Co Ltd | Production of ultrahigh strength steel |
JPH06228734A (en) * | 1993-02-02 | 1994-08-16 | Nisshin Steel Co Ltd | Production of steel for clutch diaphragm spring |
JPH06271930A (en) * | 1993-03-18 | 1994-09-27 | Nisshin Steel Co Ltd | Production of high strength and high toughness steel excellent in fatigue property |
JP3580938B2 (en) | 1996-03-05 | 2004-10-27 | アイシン・エィ・ダブリュ株式会社 | Heated bainite treatment method |
-
1999
- 1999-08-04 GB GB9918240A patent/GB2352726A/en not_active Withdrawn
-
2000
- 2000-08-02 AT AT00949724T patent/ATE331051T1/en not_active IP Right Cessation
- 2000-08-02 EP EP00949724A patent/EP1200638B1/en not_active Expired - Lifetime
- 2000-08-02 DE DE60028979T patent/DE60028979T2/en not_active Expired - Lifetime
- 2000-08-02 AU AU62999/00A patent/AU6299900A/en not_active Abandoned
- 2000-08-02 US US10/048,619 patent/US6884306B1/en not_active Expired - Fee Related
- 2000-08-02 WO PCT/GB2000/002914 patent/WO2001011096A1/en active IP Right Grant
- 2000-08-02 JP JP2001515341A patent/JP3751250B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3519497A (en) * | 1965-04-28 | 1970-07-07 | Lorraine Escaut Sa | Method for the thermal treatment of steel rails |
JPH0257637A (en) * | 1988-08-23 | 1990-02-27 | Nippon Steel Corp | Manufacture of spring with high fatigue strength and steel wire for spring for use therein |
JPH03215623A (en) * | 1990-01-19 | 1991-09-20 | Nisshin Steel Co Ltd | Production of tough high strength steel |
EP0849368A1 (en) * | 1996-12-19 | 1998-06-24 | Voest-Alpine Schienen GmbH | Shaped rolled product and method of making the same |
Non-Patent Citations (4)
Title |
---|
BULL. OSAKA PREFECT. UNIV., SER. A (1997), 46(2), 125-131, 1997 * |
CHEMICAL ABSTRACTS, vol. 132, no. 16, 17 April 2000, Columbus, Ohio, US; abstract no. 210668, TOMITA, YOSHIYUKI ET AL: "Modified austempering effects on Fe-0.6C-1.5Si-0.8Mn steel" XP002153889 * |
PATENT ABSTRACTS OF JAPAN vol. 014, no. 232 (C - 0719) 17 May 1990 (1990-05-17) * |
PATENT ABSTRACTS OF JAPAN vol. 015, no. 496 (C - 0894) 16 December 1991 (1991-12-16) * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010013054A2 (en) | 2008-07-31 | 2010-02-04 | The Secretary Of State For Defence | Bainite steel and methods of manufacture thereof |
EP2410070A1 (en) | 2008-07-31 | 2012-01-25 | The Secretary Of State For Defence | Bainite steel and methods of manufacture thereof |
US8956470B2 (en) | 2008-07-31 | 2015-02-17 | The Secretary Of State For Defence In Her Britannic Majesty's Government Of The United Kingdom Of Great Britain And Northern Ireland | Bainite steel and methods of manufacture thereof |
WO2013117953A1 (en) * | 2012-02-10 | 2013-08-15 | Ascometal | Process for making a steel part, and steel part so obtained |
CN111566246A (en) * | 2018-01-11 | 2020-08-21 | 罗伯特·博世有限公司 | Component for contact with hydrogen |
Also Published As
Publication number | Publication date |
---|---|
GB9918240D0 (en) | 1999-10-06 |
DE60028979D1 (en) | 2006-08-03 |
JP2003506572A (en) | 2003-02-18 |
ATE331051T1 (en) | 2006-07-15 |
EP1200638B1 (en) | 2006-06-21 |
US6884306B1 (en) | 2005-04-26 |
DE60028979T2 (en) | 2007-01-04 |
JP3751250B2 (en) | 2006-03-01 |
EP1200638A1 (en) | 2002-05-02 |
AU6299900A (en) | 2001-03-05 |
GB2352726A (en) | 2001-02-07 |
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