CN1477226A - Medium-low carbon manganese system self-hardening bainite steel - Google Patents
Medium-low carbon manganese system self-hardening bainite steel Download PDFInfo
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- CN1477226A CN1477226A CNA031500927A CN03150092A CN1477226A CN 1477226 A CN1477226 A CN 1477226A CN A031500927 A CNA031500927 A CN A031500927A CN 03150092 A CN03150092 A CN 03150092A CN 1477226 A CN1477226 A CN 1477226A
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Abstract
The present invention belongs to the field of alloy steel, relates to medium-low carbon air-cooled bainite steel, using C, Mn and Si as main alloy elements, and air cooling can obtain non-typical bainite or bainite/martensite heterogeneous structure. Its composition includes (wt%) C 0.15-0.34 wt%, Mn 1.80-3.00 wt%, Si 0.20-2.50 wt%, Cr 0-2.00 wt% and the rest is Fe. The steel can be used for making high-strength bolt, track, railroad switch, various shafts, and other various high-strength structure components, etc.
Description
Technical field the invention belongs to field of alloy steel, relate to a class novel in low-carbon air-cooled bainitic steel.This steel has high bainite air cooled hardenability, can exempt and quenching or the tempering of quenching, and has good combination of strength and toughness and unique economical characteristics.
Directly use after the background technology hot-work or only through the air-cooled bainitic steels of simple thermal treatment, be applied and replaced the tempered martensite steel in increasing occasion, this trend is the inevitable outcome that high-performance and economic benefit are pursued in modern steel industry.In recent years Mn-B be air-colled bainite owing to superior performance, cost is lower and technology is simply developed on an unprecedented scale, develop successively be applicable to varying strength rank and service requirements in low-carbon air-cooled bainitic steel, and obtaining many new progresses aspect the research of bainitic steel microstructure and property.
Patent publication No. is that the air-cooled bainitic steels patent of CN1042950A has overcome CN8010300A and the insufficient shortcoming of CN8010310A patent hardening capacity by the approach that improves Mn content and add strong hardening capacity element Hf, B, but the adding of Mn too high levels and Hf, B makes the alloying cost increase, also strengthen simultaneously the difficulty that smelting technology is controlled on the one hand; Processing performance is caused to a certain degree weakening.
Summary of the invention the objective of the invention is for solving the weak point of prior art, proposes a kind of in the low Carbon Manganese series air-cooled bainitic steels, by C, Mn, Si etc. mainly the reasonable combination of alloy element make it have high bainite air cooled hardenability and hardenability.Air cooling can obtain following type heterogeneous structure after the hot rolling: granular bainite/granular structure, lower bainite/martensite or carbide-free Bainite/martensite heterogeneous structure has good combination of strength and toughness.
The present invention proposes a kind of middle low Carbon Manganese series air-cooled bainitic steels, it is characterized in that, this steel grade is main alloy element with C, Mn, Si, and air cooling obtains atypia bainite or bainite/martensite heterogeneous structure, and its composition weight percent is: C:0.15～0.34wt.%; Mn:1.80～3.00wt.%; Si:0.20～2.50wt.%; Cr:0～2.00wt.%; Surplus is Fe.
This steel grade is applicable to following field respectively according to the difference of composition, tissue, tempering process and performance:
1. this steel grade has overcome the insufficient shortcoming of delayed fracture drag of Hi-Stren steel, makes the invention steel can obtain carbide-free Bainite/martensite heterogeneous structure under the air cooling condition by control Si content.When tissue was able to remarkable refinement, stable membranaceous residual austenite can be used as toughness phase and irreversible hydrogen trap again, effectively improved delayed fracture property, fatigue property and the toughness of steel, and its preferable chemical ingredients scope is C:0.15～0.34wt.%; Mn:1.80～3.00wt.%; Si:0.90～2.20wt.%; Air cooling is after its mechanical property of low-temperaturetempering is as follows: σ
b〉=1400MPa, σ
0.2〉=1200MPa, a
KU〉=90J/cm
2, K
ISCC〉=50MPam
1/2, σ
-1＞700MPa, can be used for making high strength bolt, rail, road fork, various axial workpiece and other important engineering structure part, alleviate the weight of engineering component and equipment significantly, simplifying technology, save energy and reduce material and the technology cost, is the ideal replacement kind of high-strength steel and ultrahigh-strength steel.
2. can obtain granular bainite and lower bainite/martensite heterogeneous structure behind this steel grade air cooling, the optimal components ratio of its main alloy element is C:0.15～0.34wt.%; Mn:1.80～2.70wt.%; Si:0.2～0.90wt.%; Its toughness and tenacity is as follows behind average tempering: σ
b〉=900MPa, σ
0.2〉=750MPa, δ
5〉=16%, ψ 〉=45%, α
KU〉=110J/cm
2Its toughness and tenacity is as follows behind the high tempering: σ
b〉=850MPa, σ
0.2〉=650MPa, δ
5〉=16%, ψ 〉=50%, α
KU〉=150J/cm
2, be suitable for making sucker rod, anchor chain, all kinds of axle, high intensity standard part and various non-hardened and tempered steel part.
3. this steel grade has advantages of good casting and high air cooled hardenability, and hardness can reach more than the HRc45 behind the air cooling, and the non-notch impact toughness is greater than 70J/cm
2, be applicable to and, also can use the various wearing pieces and the various high strength part of usefulness such as making metal mine, cement, power plant, colliery at forging rolling thermoforming state as tooth plate, teeth, tup, wear-resisting centrifugal cast tube etc.Its preferable composition range is C:0.20～0.34wt.%; Mn:2.00～2.70wt.%; Si:0.9～2.00wt.%; Can replace traditional low-alloy wear-resistant steel and High Manganese Steel Casting, overcome High Manganese Steel Casting not attrition resistant shortcoming under the effect of non-intense impact load, and low-alloy wear-resistant steel hardening capacity is low, material cost and the technology cost is higher, the unfavorable factor of technology relative complex, can significantly improve intensity, improve wear resisting property, weight reduction and economical with materials and raising life-span.
Embodiment
The multinomial embodiment of this steel grade sees the following form:
| Numbering | ?C | ?Mn | ?Si | ?Cr | ?Ca | ?Mo | ?Ni | ?Ti | ?Nb | ?V | ?Cu | ?Re、B |
| №.1 | ?0.15 | ?2.34 | ?1.78 | ?0.59 | ?- | ?0.40 | ?0.60 | ?0.30 | ||||
| №.2 | ?0.16 | ?2.33 | ?1.44 | ?0.65 | ?- | ?0.55 | ?- | ?- | ||||
| №.3 | ?0.20 | ?2.25 | ?1.82 | ?0.86 | ?0.38 | ?0.90 | ?0.12 | |||||
| №.4 | ?0.24 | ?2.31 | ?1.88 | ?- | ?- | ?- | ||||||
| №.5 | ?0.27 | ?2.26 | ?1.65 | ?0.77 | ?- | ?- | ?0.40 | ?- | ||||
| №.6 | ?0.29 | ?2.32 | ?1.59 | ?0.78 | ?- | |||||||
| №.7 | ?0.34 | ?2.40 | ?1.60 | ?0.70 | ?0.20 | ?0.30 | ?0.03 | |||||
| №.8 | ?0.16 | ?2.29 | ?0.74 | ?0.66 | ?0.006 | ?0.10 | ?0.38 | ?0.002B | ||||
| №.9 | ?0.18 | ?2.35 | ?0.50 | ?0.68 | ?0.008 | |||||||
| №.10 | ?0.19 | ?2.24 | ?0.80 | ?1.05 | ?- | ?0.10 | ?0.003B | |||||
| №.11 | ?0.23 | ?2.34 | ?0.72 | ?0.46 | ?0.03 | ?0.0 | ||||||
| №.12 | ?0.25 | ?2.15 | ?0.83 | ?0.30 | ||||||||
| №.13 | ?0.29 | ?2.33 | ?0.66 | ?0.52 | ||||||||
| №.14 | ?0.32 | ?2.36 | ?0.47 | ?0.89 | ||||||||
| №.15 | ?0.33 | ?2.31 | ?0.60 | ?0.79 | ||||||||
| №.16 | ?0.34 | ?2.35 | ?0.61 | ?1.02 | ?0.39 | |||||||
| №.17 | ?0.21 | ?2.23 | ?0.96 | ?0.87 | ?0.05 | |||||||
| №.18 | ?0.23 | ?2.16 | ?1.11 | ?0.0 | ?0.04Re | |||||||
| №.19 | ?0.27 | ?2.34 | ?0.92 | ?0.82 | ||||||||
| №.20 | ?0.29 | ?2.09 | ?1.50 | ?0.70 | ?0.08 | ?0.05Re | ||||||
| №.21 | ?0.30 | ?2.06 | ?1.58 | ?0.92 | ?0.26 | ?0.52 | ?0.04Re | |||||
| №.22 | ?0.31 | ?2.15 | ?1.52 | ?0.87 | ?0.12 | |||||||
| №.23 | ?0.32 | ?2.30 | ?1.30 | ?0.30 | ?0.30 | ?0.20 | ?0.05 | ?0.002B | ||||
| №.24 | ?0.34 | ?2.25 | ?0.97 | ?1.00 | ?- | ?- | ?- |
The Application Areas that every embodiment is fit to is as follows:
Share in making having of high strength bolt and structural part: No.1-No.7
Be suitable for making having of various axles, standardized component and non-hardened and tempered steel part: No.8-No.16
Be suitable for making having of various wear resistance castingses: No.17-No.24
Claims (5)
1. low Carbon Manganese series air-cooled bainitic steels in a kind is characterized in that this steel grade is main alloy element with C, Mn, Si, and air cooling obtains atypia bainite or bainite/martensite heterogeneous structure, and its composition weight percent is: C:0.15～0.34wt.%; Mn:1.80～3.00wt.%; Si:0.20～2.50wt.%; Cr:0～2.00wt.%; Surplus is Fe.
By claim 1 described in low-carbon air-cooled bainite/martensite multi-phase steel, it is characterized in that its main alloy element composition weight percent is:
C：0.15～0.34wt.％；Mn：1.80～3.00wt.％；Si：0.90～2.20wt.％；
By claim 1 described in low-carbon air-cooled bainite/martensite multi-phase steel, it is characterized in that its main alloy element composition weight percent is
C：0.15～0.34wt.％；Mn：1.80～2.70wt.％；Si：0.2～0.90wt.％；
By claim 1 described in low-carbon air-cooled bainite/martensite multi-phase steel, it is characterized in that its main alloy element composition weight percent is
C：0.20～0.34wt.％；Mn：2.00～2.70wt.％；Si：0.9～2.00wt.％；
By claim 1 described in low-carbon air-cooled bainite/martensite multi-phase steel, it is characterized in that on the claim 1 composition basis adding one or more of following trace element:
V：0～0.12wt.％；Nb：0～0.12wt.％；Cu：0～0.5wt.％；
Mo：0～0.50wt.％；Ni：0～1.00?wt.％；Ti：0～0.12wt.％；
B：0～0.0040wt％：Ca：0～0.10wt％，Re?0～0.50?wt％。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150092 CN1210430C (en) | 2003-08-01 | 2003-08-01 | Medium-low carbon manganese system self-hardening bainite steel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03150092 CN1210430C (en) | 2003-08-01 | 2003-08-01 | Medium-low carbon manganese system self-hardening bainite steel |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1477226A true CN1477226A (en) | 2004-02-25 |
| CN1210430C CN1210430C (en) | 2005-07-13 |
Family
ID=34156426
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03150092 Expired - Fee Related CN1210430C (en) | 2003-08-01 | 2003-08-01 | Medium-low carbon manganese system self-hardening bainite steel |
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| EP1780293A2 (en) | 2005-10-28 | 2007-05-02 | Saarstahl AG | Procedure for manufacturing of steel starting material by warm deforming |
| CN100395366C (en) * | 2004-12-31 | 2008-06-18 | 马鞍山钢铁股份有限公司 | Bainite steel for railroad carriage wheel |
| CN100408712C (en) * | 2005-04-18 | 2008-08-06 | 河南省强力机械有限公司 | Quasi bainitic steel |
| EP2103704A1 (en) | 2008-03-10 | 2009-09-23 | Swiss Steel AG | Hot-rolled long product and method for its manufacture |
| CN101880826A (en) * | 2010-07-08 | 2010-11-10 | 安徽工业大学 | Non-hardened bainite cold heading steel for fastener and manufacturing method thereof |
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2003
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