CN1078269A - Air-cooled bainite steel with high toughness and high quenching performance - Google Patents
Air-cooled bainite steel with high toughness and high quenching performance Download PDFInfo
- Publication number
- CN1078269A CN1078269A CN 93106429 CN93106429A CN1078269A CN 1078269 A CN1078269 A CN 1078269A CN 93106429 CN93106429 CN 93106429 CN 93106429 A CN93106429 A CN 93106429A CN 1078269 A CN1078269 A CN 1078269A
- Authority
- CN
- China
- Prior art keywords
- steel
- bainite
- air
- toughness
- composition
- 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
Landscapes
- Heat Treatment Of Steel (AREA)
Abstract
The invention provides a kind of high toughness high hardenability air-colled bainite structural alloy steel, belong to field of alloy steel.The composition of steel is (%wt): C0.05-0.50, Si1.00-3.00, Mn2.00-4.00, Mo0.31-0.49, B0.0005-0.005.
Steel of the present invention has high bainite hardening capacity, when it promptly obtains bainite structure behind high temperature austenite state air cooling, has good high-strong toughness.Steel of the present invention is suitable for being used to make the large-sized heavy parts that need the high-strong toughness energy with forging rolling thermoforming state or casting state, also is suitable for making the high tough parts of common size.Steel of the present invention does not need quenching heat treatment, thereby heat processing technique is simplified energy saving, equipment saving, productivity raising.
Description
The invention provides a kind of high toughness high hardenability air-colled bainite structural alloy steel, belong to field of alloy steel.
Progress to bainite showed in recent years, atypia bainites such as granular bainite have shown the mechanical property comparatively more superior than tempered martensite: under equal strength, have higher impelling strength and fracture toughness property, long fatigue lifetime, higher hardenability value, higher even reduction of area and higher uniform elongation, higher cracking patten nucleus power and crack expansion power, equal fatigue strength.Its shortcoming is lower yield strength and yield tensile ratio.Therefore reach a conclusion: the comprehensive mechanical property of atypia bainites such as granular bainite is good, has wide application prospect.So, on using, having risen this new steel grade of air-cooled bainitic steels in recent years, new steel grade has saved common quenching heat treatment, not only exempt quenching defect, the more important thing is and saved the energy and equipment, simplified production process, thereby improved productivity, reduced cost.In existing air-cooled bainitic steels, though the grade of steel 15SiMn3Mo among the YB6-71 is original design not to be air-cooled bainitic steels, but feature with air-cooled bainitic steels, though this steel is an alloying element with inexpensive Si, Mn, but used Mo up to 0.5-0.6%, this just makes steel have the cost under being in not, thereby fails to apply always.The Si-Mn-Mo steel that Chinese patent CN1036231A is provided, because Mo content less (0.2-0.3%), and do not contain B, thereby bainite hardening capacity seems not enough, can not make the heavy parts of large size behind forging rolling, stably obtain atypia bainite structures such as desired particulate bainite during air cooling, cause the toughness deficiency.
The air-cooled bainitic steels that the purpose of this invention is to provide a kind of high toughness high hardenability, requirement when satisfying the heavy parts of important large size to steel high-strong toughness and high-hardenability, and the requirement of satisfying important common size high-strong toughness energy parts, and make cost lower.
The chemical ingredients scope of steel provided by the present invention is (%wt.):
C Si Mn Mo B
0.05 1.00 2.00 0.31 0.0005
-0.50 -3.00 -4.00 -0.49 -0.005
Surplus is Fe.
Also contain element Re 0.001-0.3(%wt. in the steel).
Except that above-mentioned described composition, can also contain one or more following column element (%wt.) in the steel:
Ca Mg Ga Be Cu Ti V
0.001 0.001 0.001 0.001 0.01 0.001 0.001
-0.1 -0.1 -0.1 -0.5 -0.5 -0.05 -0.5
C in the steel, Si, Mn content for selecting for use, to adapt to different needs, are treated as and are divided into (%wt.) in the scope of broad:
(1) C0.05-0.15, Si+Mn4-6, the desirable critical bainite through hardening diameter of the no perlite of steel is 110-190mm, tensile strength is 750-1000MPa.
(2) C0.15-0.25, Si+Mn4-6, the desirable critical bainite through hardening diameter of the no perlite of steel is 170-240mm, tensile strength is 950-1200MPa.
(3) C0.25-0.35, Si+Mn4-6, the desirable critical bainite through hardening diameter of the no perlite of steel is 220-270mm, tensile strength is 1150-1450MPa.
(4) C0.35-0.50, Si+Mn4-6, the desirable critical bainite through hardening diameter of the no perlite of steel is 250-290mm, tensile strength is 1350-1700MPa.
Its thermal process parameter of steel provided by the present invention is: 1500-1650 ℃ of casting and pouring temperature.1250-550 ℃ of forging rolling hot-forming temperature.After casting or the forging rolling thermoforming between 900-300 ℃ with the speed air cooling of average cooling rate＞1 ℃/min, again in 250-500 ℃ of tempering, can use and need not to carry out again Q-tempering thermal treatment.But this steel also adapts to the various conventional thermal treatment of carrying out structural alloy steel, for example annealing, normalizing, quenching, tempering, carburizing, nitriding etc.
The Mn element that the present invention adopts capacity to improve hardening capacity strongly carries out alloying, cooperates alloying collaborative mutually with Mo-B that can the most effective acquisition bainite hardening capacity, makes steel not only have high hardening capacity, and can guarantee the desirable bainite structure of acquisition.Adopted medium Mo content, both guaranteed to obtain bainite, do not made cost too high again.Because the matrix of atypia bainites such as granular bainite is the not high ferrite of saturation ratio, for guaranteeing enough obdurabilities, the Si element that must add q.s obtains granular bainite with assurance, and makes the ferrite matrix highly malleablized.Trace B plays an important role to obtaining high bainite hardening capacity, with micro-B alloying the time, decide nitrogen as long as accomplish deoxidation during steel-making before adding B, and protects B with Re, and the technology that adds B is to grasp easily, and China has the experience of 35 years production boron steels.When using the B alloying, cooperate simultaneously and add rare earth element Re, can improve the hardening capacity and the toughness of steel very effectively.Trace elements of Ca, Mg, Ga, Be all can effectively improve the toughness of steel.Ti and V make the crystalline grain of steel refinement, so that still have thin crystal particle scale during the air cooling of elevated temperature heat processing back, thus further guaranteed the high-strong toughness behind the air cooling.Element Cu can improve the resistance to atmospheric corrosion of steel, and the ferrite matrix obdurability is further improved.The development of column crystal when element B, Re, Ca, Mg etc. can suppress casting solidification effectively, this is for improving ingot structure, and to improve the heavy parts of rotary casting thick-walled tube all be very beneficial.
Steel provided by the present invention can use at forging rolling thermoforming state, also can use at the casting state.Because this steel has high-strong toughness, high-hardenability, air cooling obtains bainite three big characteristics, just make this steel be suitable for especially as making the heavy parts of the important large size that requires high-strong toughness, thick-walled long-tube heavy machine member (drill collar for example, extra-weight drillpipe, drilling rod, autoclave, axle, generator rotor shaft, steam turbine rotor shaft etc.), mould etc., and be used to make the important common size parts that require high-strong toughness, automobile for example, tractor, rolling stock, boats and ships, mine and boring mechanic, engineering machinery, the axle of engine etc., bent axle, connecting rod, gear, fastening piece, wheel, rim, heavy-duty spring, stamping parts, and be used to make armour and ballistic-resistant article etc.
Steel provided by the present invention has following advantage:
1, high-strong toughness, the drill collar made from this steel air cooling and tempering after rotation precision fork moulding for example, tensile strength mean value is σ
b1076MPa, sharpy gap impelling strength merit mean value is AKV106.4J.This high-strong toughness even the 4145H steel reach through the drill collar of Q-tempering thermal treatment manufacturing also difficulty.This just makes this steel can be applied to the important parts that require high-strong toughness.
2, high-hardenability, it does not have pearlitic bainite hardening capacity index and reaches ideal critical diameter 110-290mm, and this just can make steel be applied to large-sized heavy parts.
3, thermal treatment such as need not quench, air cooling can obtain bainite structure and have high obdurability after the forging rolling thermoforming or behind the casting, as long as the air cooling cooling rate guarantees the average cooling rate＞1 ℃/min between 900-300 ℃, defectives such as quenching strain and crackle have been exempted simultaneously.
4, save the energy, save the investment of Equipment for Heating Processing.
5, heat processing technique is simple, and productivity improves, and yield rate improves.
Non-limiting examples of the present invention:
Steel of the present invention is used to make drill collar than the low carbon content person, air cooling and tempering after the moulding of rotation precision fork; Performance is tensile strength mean value σ
b=1076MPa, scattered band is 99.7% σ
b〉=933MPa; Sharpy gap impelling strength merit mean value AKV=106.4J, scattered band is AKV 〉=69.8J of 99.7%.
The medium carbon content person of steel of the present invention is used to make the high-powered engine bent axle, air cooling and tempering after the hot closed-die forging moulding, and performance is a tensile strength sigma
b〉=1270MPa, σ
0.2〉=850MPa, δ 〉=13%, ψ 〉=48%, σ
-1〉=480MPa, AKV 〉=40J.
Steel higher carbon content person of the present invention is used to make heavy-duty spring, air cooling and tempering after the thermoforming, tensile strength sigma
b〉=1350MPa.
Steel higher carbon content person of the present invention is used to make injection mold, air cooling and tempering after the forge hot, C level Rockwell hardness HRC 〉=43.
No C Si Mn Mo B Re
1 0.09 1.15 2.41 0.40 0.002 0.11
2 0.13 1.50 3.12 0.34 0.001 0.08
3 0.14 1.36 2.90 0.32 0.002 0.14
4 0.16 1.55 3.03 0.35 0.002 0.10
5 0.21 1.41 3.01 0.37 0.002 0.13
6 0.25 1.14 3.16 0.42 0.001 0.05
7 0.29 1.23 2.93 0.33 0.002 0.06
8 0.34 1.33 2.86 0.41 0.001 0.10
9 0.38 1.98 2.99 0.36 0.002 0.13
10 0.44 1.82 2.86 0.38 0.002 0.07
11 0.49 2.10 2.93 0.40 0.001 0.05
Claims (10)
1, a kind of high toughness high hardenability air-colled bainite structural alloy steel, it is characterized in that: with Si, Mn, Mo, B, C is main alloy element, the chemical ingredients scope is (%wt.):
C Si Mn Mo B
0.05 1.00 2.00 0.31 0.0005
-0.50 -3.00 -4.00 -0.49 -0.005
Surplus is Fe.
2, steel according to claim 1 is characterized in that: the main alloy element in the steel also has Re 0.001-0.3(%wt.).
3, steel according to claim 1 and 2 is characterized in that: the following column element (%wt.) that can also contain one or more in the steel:
Ca Mg Ca Be Cu Ti V
0.001 0.001 0.001 0.001 0.01 0.001 0.001
-0.1 -0.1 -0.1 -0.5 -0.5 -0.05 -0.5
4, steel according to claim 1 and 2 is characterized in that: the composition of steel is C0.05-0.15, Si+Mn4-6.
5, steel according to claim 1 and 2 is characterized in that: the composition of steel is C0.15-0.25, Si+Mn4-6.
6, steel according to claim 3 is characterized in that: the composition of steel is C0.15-0.25, Si+Mn4-6.
7, steel according to claim 1 and 2 is characterized in that: the composition of steel is C0.25-0.35, Si+Mn4-6.
8, steel according to claim 3 is characterized in that: the composition of steel is C0.25-0.35, Si+Mn4-6.
9, steel according to claim 1 and 2 is characterized in that: the composition of steel is C0.35-0.50, Si+Mn4-6.
10, according to claim 1 or 2 steel that provided, its technology is: 1500-1650 ℃ of casting and pouring temperature, and to forge and prick 1250-550 ℃ of hot-forming temperature, air cooling after casting or the forging rolling thermoforming is again in 250-500 ℃ of tempering.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93106429A CN1034287C (en) | 1993-05-29 | 1993-05-29 | Air-cooled bainite steel with high toughness and high quenching performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN93106429A CN1034287C (en) | 1993-05-29 | 1993-05-29 | Air-cooled bainite steel with high toughness and high quenching performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1078269A true CN1078269A (en) | 1993-11-10 |
| CN1034287C CN1034287C (en) | 1997-03-19 |
Family
ID=4986228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN93106429A Expired - Fee Related CN1034287C (en) | 1993-05-29 | 1993-05-29 | Air-cooled bainite steel with high toughness and high quenching performance |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1034287C (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387746C (en) * | 2005-04-18 | 2008-05-14 | 河南省强力机械有限公司 | Quasi bainitic steel and its application in rail way industry |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| CN102453786A (en) * | 2010-10-29 | 2012-05-16 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting steel for drill rod joint by using rotating furnace, and steel for drill rod joint |
| CN103695767A (en) * | 2013-12-18 | 2014-04-02 | 宁夏维尔铸造有限责任公司 | Bainite steel |
| CN116200668A (en) * | 2023-04-17 | 2023-06-02 | 宁波晴力紧固件有限公司 | Heat-resistant high-strength fastener material and preparation method thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100368582C (en) * | 2003-01-28 | 2008-02-13 | 鞍钢股份有限公司 | Ultra-low-carbon bainite steel and producing method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN86103008B (en) * | 1986-04-30 | 1987-06-24 | 清华大学 | Medium carbon air-cooled mn/b bainitic steel |
-
1993
- 1993-05-29 CN CN93106429A patent/CN1034287C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100387746C (en) * | 2005-04-18 | 2008-05-14 | 河南省强力机械有限公司 | Quasi bainitic steel and its application in rail way industry |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| CN102453786A (en) * | 2010-10-29 | 2012-05-16 | 攀钢集团钢铁钒钛股份有限公司 | Method for smelting steel for drill rod joint by using rotating furnace, and steel for drill rod joint |
| CN103695767A (en) * | 2013-12-18 | 2014-04-02 | 宁夏维尔铸造有限责任公司 | Bainite steel |
| CN116200668A (en) * | 2023-04-17 | 2023-06-02 | 宁波晴力紧固件有限公司 | Heat-resistant high-strength fastener material and preparation method thereof |
| CN116200668B (en) * | 2023-04-17 | 2023-11-14 | 宁波晴力紧固件有限公司 | Heat-resistant high-strength fastener material and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1034287C (en) | 1997-03-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN1210430C (en) | Medium-low carbon manganese system self-hardening bainite steel | |
| EP1384794B1 (en) | Spheroidal cast iron particulary for piston rings and method for its production | |
| CN102277581B (en) | Heat treatment process of low-carbon alloy material | |
| CN102296167A (en) | Cryogenic treatment process for 9SiCr die steel used for railway freight cars | |
| US4838956A (en) | Method of producing a spheroidal graphite cast iron | |
| CN1142308C (en) | High-strength high-impact toughness bearing steel and its heat treatment process | |
| CN1092243C (en) | Economic high speed steel | |
| CN105316590A (en) | High-tenacity boron-containing high-speed steel and preparation method thereof | |
| CN109321739A (en) | A kind of heat-treatment processing process of big infiltration layer heavy-duty gear | |
| CN1212417C (en) | Manufacturing method for nodular cast iron | |
| CN101638791A (en) | Heat treatment process for driving and driven bevel gear of drive axle | |
| CN1078269A (en) | Air-cooled bainite steel with high toughness and high quenching performance | |
| JPH0217606B2 (en) | ||
| CN112048668B (en) | High-hardness steel for shield cutter and manufacturing method thereof | |
| WO2006022494A1 (en) | Method for manufacturing a brake disk for vehicles | |
| US4052230A (en) | Deep hardening machinable aluminum killed high sulfur tool steel | |
| CN1107736C (en) | Stentor cemented steel for gear and thermal working technology | |
| CN1207420C (en) | Alloy steel, holders and holder details for plastic moulding tools, and tough hardened blanks for holders and holder details | |
| JPS582243B2 (en) | Manufacturing method for non-thermal forged parts for automobiles | |
| US4019930A (en) | Deep hardening machinable aluminum killed high sulfur tool steel | |
| CN107217211A (en) | A kind of flange disk-like accessory and its manufacture method | |
| CN113718163A (en) | Relieving and preparation method thereof | |
| CN112795722A (en) | Austempering technology for austempered ductile iron | |
| JPH0559427A (en) | Production of wear resistant steel | |
| CN1158362A (en) | Multicomponent alloyed cast and forged wearing, corrosion resistant and high toughness grinding balls and its prodn. method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |