CN1844435A - Mn-Cr-W series air-cooled bainitic steels - Google Patents
Mn-Cr-W series air-cooled bainitic steels Download PDFInfo
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- CN1844435A CN1844435A CN 200610078770 CN200610078770A CN1844435A CN 1844435 A CN1844435 A CN 1844435A CN 200610078770 CN200610078770 CN 200610078770 CN 200610078770 A CN200610078770 A CN 200610078770A CN 1844435 A CN1844435 A CN 1844435A
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Abstract
This invention relates to manganese-chrome-tungsten system air cooling Bainitic steel, which belongs to the alloy steel technique field. This kind of steel uses manganese, silicon, chrome as the main alloy elements, and uses tungsten as the complement element, which has high strong toughness and Bainitic air cooling harden ability, it can obtain the Bainitic or Geneva compound structure under air cooling condition without quenching working procedure, which can be applied in making all kinds of axis accessory, constructional elements, springs, wear-resisting parts, precision mold and wear-resisting cast steels. And this kind of steel has well strong toughness co-operating, which can replace the modified steel with similar capability and can be made into all kinds of constructional elements after high-temperature tempering, and it can do surface quench.
Description
Technical field
The present invention relates to a kind of Mn-Cr-W series air-cooled bainitic steels, belong to the steel alloy technical field.
Background technology
The bainitic steel air cooling from hard, simplify production process, improve performance, save energy, and significantly reduce cost, thereby cause in the world and greatly pay attention to.So far, air-cooled bainitic steels has two composition series in the world: a class is to be bainitic steel with the Mo-B in fifties invention headed by Britain doctor P.B.Pickering, makes its application be subjected to very big restriction owing to the Mo element costs an arm and a leg; Another kind of is being bainitic steel (patent of invention CN8010300A and CN8010310A) in the Mn of initial stage seventies invention system and Mn-B headed by China Fang Hongsheng professor.Since the cost of material of Mn has only Mo's～1/50, its superiority is remarkable, so Mn is that bainitic steel has obtained excellent popularization and application in recent years, and has developed middle low-carbon (LC), middle carbon and medium high carbon Mn series air-cooled bainitic steels in succession, at railway, a plurality of fields such as oil, mining have obtained application.
Summary of the invention
The objective of the invention is to propose a kind of Mn-Cr-W series air-cooled bainitic steels, the air cooled hardenability of further raising bainitic steel, obdurability, temper resistance etc., to widen the Application Areas of bainitic steel, satisfy the needs of industries such as mining, building, railway, automobile, military project, oil; With Mn, Si, Cr is main alloy element, is main auxilliary added elements with W, makes this steel grade have high hardening capacity, and air cooling can obtain uniform bainite/martensite heterogeneous structure, and performance is more good, can reduce the use cost of material.
The Mn-Cr-W series air-cooled bainitic steels that the present invention proposes comprises following composition, and its weight percent is:
C 0.06～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～2.00wt.％；
Cr 0.10～2.00wt.％；
W 0.10～1.00wt.％；
Surplus is Fe.
The Mn-Cr-W series air-cooled bainitic steels that the present invention proposes is to be modified to branch to obtain on the basis of manganese series air-cooled bainitic steels.On the basis of manganese-silicon-chromium steel, add a spot of W element (0.1%～1%) by experiment showed,, just can obviously postpone high temperature transformation, and warm bainite transformation temperature in reducing.This is because W and Mn element produce compound aurification effect, has significantly improved the air cooled hardenability of steel, and its effect is far above independent interpolation Mn, Cr element or W, Cr element.Compound aurification effect just because of W, Mn, Cr makes steel of the present invention have high bainite air cooled hardenability, can obtain the bainite/martensite heterogeneous structure behind the air cooling.In the steel of the present invention, the part experimental steel be when cooling rate just can obtain bainite during greater than 0.056 ℃/s, is equivalent to thickness and is can obtain bainite or bainite/martensite heterogeneous structure, hardness value＞Hv320 behind the sheet material air cooling of 200mm.Therefore, this type of steel can be removed quenching process from, saves production cost.In addition, the adding of W can also improve the temper resistance of steel simultaneously, improves the strength and toughness of steel.(composition is that 0.20～0.30wt%C, an amount of Mn, 0.50～1.60wt.%Si, 0.50～1.00wt.%Cr) are example with the 56V steel, on its composition basis, add 0.40～0.70wt%W (W2 steel), compare (as Fig. 1, Fig. 2) with the former wolfram steel that do not contain, under the different heat treatment technology, the obdurability that contains W steel W2 generally is better than not containing W steel 56V; When tempering temperature is higher than 340 ℃, the tensile strength sigma b and the yield strength σ 0.2 that do not contain W steel 56V all occur obviously descending toughness value Akv≤20J; And contain W steel W2 after 400 ℃ of tempering, keep high intensity and toughness, its σ
b〉=1300MPa; σ
0.2〉=1100MPa; δ
5〉=15%; ψ 〉=60%; Akv 〉=50J.Therefore in steel, add W and can make steel tempering under comparatively high temps, obtain good strength and toughness and cooperate.
So Mn-Cr-W series air-cooled bainitic steels of the present invention's proposition, have high obdurability and bainite air cooled hardenability, can obtain the bainite/martensite heterogeneous structure under the air cooling condition, can exempt quenching process, be applicable to and make various axial workpieces, structural part, all kinds of spring, wear part, precision die and wear-resistant cast steel parts.The part test steel can obtain σ under the air cooling condition
b〉=1350MPa; σ
0.2〉=950MPa; δ
5〉=14%; ψ 〉=40%; a
Kv〉=65J/cm
2, can be used for substituting existing railroad frog steel and heavy rail, performance is safer reliable.This steel grade has good combination of strength and toughness behind high tempering, the quenched and tempered steel that alternative performance is close is used for making various high-strength structure spares, and can carry out hard surfacing; With the spring steel is example, σ behind average tempering
b〉=1900MPa; σ
0.2〉=1650MPa; σ
0.2/ σ
b〉=0.88, δ
5〉=7%; ψ 〉=35%; A
Ku〉=35J/cm
2σ
R0.1〉=1630MPa can replace existing spring steel and be used to make laminated spring, coil spring and tapered spring, has the distinguishing feature that reduces heating number of times, shortening Production Flow Chart, and can reduce cost significantly.
In sum, the advantage of Mn-Cr-W series air-cooled bainitic steels of the present invention is that with Mn, Si, Cr be main alloy element, is main auxilliary added elements with W, has high hardening capacity, and air cooling can obtain uniform bainite/martensite heterogeneous structure; Compare with other types organization steel, have characteristics such as obdurability is good, hardening capacity is high, technology is simple with intensity rank.
Description of drawings
Fig. 1 is that tensile strength and the yield strength under containing the W steel and not containing the different tempering temperatures of W steel compares.
Fig. 2 is that the v-notch impelling strength under containing the W steel and not containing the different tempering temperatures of W steel compares.
Embodiment
The Mn-Cr-W series air-cooled bainitic steels that the present invention proposes comprises following composition, and its weight percent is:
C 0.06～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～2.00wt.％；
Cr 0.10～2.00wt.％；
W 0.10～1.00wt.％；
Surplus is Fe.
Main alloy element in the above-mentioned Mn-Cr-W series air-cooled bainitic steels, its weight percent can also for:
C 0.06～0.29wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～2.00wt.％；
Cr 0.30～2.00wt.％；
W 0.20～1.00wt.％
Main alloy element in the above-mentioned Mn-Cr-W series air-cooled bainitic steels, its weight percent can also for:
C 0.35～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.90～2.00wt.％；
Cr 0.30～2.00wt.％；
W 0.20～1.00wt.％
Main alloy element in the above-mentioned Mn-Cr-W series air-cooled bainitic steels, its weight percent can also for:
C 0.29～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～0.90wt.％；
Cr 0.30～1.00wt.％；
W 0.30～1.00wt.％
Above-mentioned Mn-Cr-W series air-cooled bainitic steels can also comprise following one or more alloying elements, its weight percent can for:
V 0.03～0.10wt.％；
Nb 0.03～0.10wt.％；
B 0.001～0.004wt.％；
Mo 0.05～0.50wt.％；
Ni 0.20～3.00wt.％；
Ti ≤0.10wt.％；
S 0.04～0.1wt.％；
Ca 0.001～0.01wt.％
Below enumerate embodiments of the invention:
| The steel grade numbering | Chemical ingredients (wt.%) | |||||
| C | Mn | Si | Cr | W | Other | |
| 1 | 0.26 | 2.70 | 0.30 | 0.42 | 0.21 | 0.011Ti |
| 2 | 0.25 | 2.60 | 1.42 | 0.46 | 0.11 | 0.022Ti；0.002B |
| 3 | 0.07 | 2.30 | 0.70 | 0.89 | 0.61 | 0.02Ti |
| 4 | 0.29 | 2.71 | 1.51 | 0.49 | 0.48 | 0.02Ti |
| 5 | 0.11 | 2.41 | 0.68 | 1.02 | 0.58 | |
| 6 | 0.37 | 2.22 | 1.56 | 0.60 | 0.62 | |
| 7 | 0.37 | 2.25 | 0.30 | 0.67 | 0.89 | 0.002Ti |
| 8 | 0.35 | 2.19 | 1.47 | 0.89 | 0.14 | 0.25Mo |
| 9 | 0.36 | 2.45 | 1.60 | 0.01 | 0.12 | 0.22Mo |
| 10 | 0.40 | 2.10 | 1.61 | 0.02 | 0.16 | 0.033Ti；0.002B |
| 11 | 0.38 | 2.40 | 1.41 | 0.92 | 0.58 | |
| 12 | 0.44 | 2.38 | 0.30 | 1.01 | 0.65 | 0.005Ti；0.21Mo；0.30Ni |
| 13 | 0.38 | 2.25 | 1.44 | 0.56 | 0.13 | |
| 14 | 0.41 | 2.22 | 0.30 | 0.85 | 0.94 | 0.003Ti |
| 15 | 0.42 | 2.16 | 0.30 | 0.87 | 0.16 | |
| 16 | 0.55 | 2.34 | 1.72 | 0.82 | 0.17 | |
| 17 | 0.34 | 2.09 | 1.50 | 0.40 | 0.10 | 0.10V；0.21Nb；0.003B |
| 18 | 0.20 | 2.22 | 1.51 | 0.91 | 0.50 | |
| 19 | 0.45 | 2.15 | 1.52 | 0.47 | 0.11 | 0.013Ti；0.08Nb；0.30Mo；0.39Ni；0.002 |
| 20 | 0.26 | 2.28 | 1.204 | 0.879 | 0.10 | 0.589Ni；0.358Mo |
| 21 | 0.25 | 2.13 | 1.057 | 0.866 | 0.68 | 0.86Ni |
| 22 | 0.22 | 2.11 | 1.32 | 0.44 | 0.61 | |
| 23 | 0.33 | 2.23 | 1.21 | 0.872 | 0.69 | |
| 24 | 0.20 | 2.22 | 0.85 | 0.66 | 0.41 | 2.5Ni |
| 25 | 0.35 | 2.68 | 0.65 | 0.25 | 0.10 | 0.004Ti；0.05S；0.001Ca |
| 26 | 0.38 | 2.34 | 0.58 | 0.93 | 0.10 | 0.01Ti；0.001B |
| 27 | 0.39 | 2.33 | 0.61 | 0.80 | 0.55 | 0.01Ti；0.56Ni |
| 28 | 0.37 | 2.32 | 0.63 | 0.80 | 0.88 | 0.02Ti；0.52Ni |
| 29 | 0.38 | 2.34 | 0.60 | 0.91 | 0.25 | 0.009Ti；0.51Ni |
| 30 | 0.54 | 2.39 | 1.47 | 1.02 | 0.11 | |
| 31 | 0.46 | 2.43 | 0.50 | 0.89 | 0.10 | 0.008Ti；0.25Mo |
| 32 | 0.26 | 2.36 | 0.51 | 0.92 | 0.58 | 0.003Ti，0.89Ni |
| 33 | 0.44 | 2.23 | 0.55 | 0.93 | 0.97 | 0.002Ti |
| 34 | 0.53 | 2.20 | 0.64 | 0.92 | 0.12 | 0.021Ti；0.002B |
| 35 | 0.40 | 2.30 | 0.20 | 1.00 | 0.20 | 0.009S，0.002Ca |
| 35 | 0.40 | 2.30 | 0.20 | 1.00 | 0.20 | 0.009S，0.002Ca |
| 36 | 0.18 | 1.94 | 0.23 | 1.40 | 0.12 | |
| 37 | 0.19 | 2.00 | 0.20 | 1.80 | 0.10 |
The Mn-Cr-W series air-cooled bainitic steels that the present invention proposes can be used the conventional molten refining of method.Be suitable for making spring, tooth bar, sheet material, railroad frog, heavy rail, large-scale bolt, wear part, weldless steel tube, sucker rod, precision die, wear-resistant cast steel parts etc.
Claims (5)
1, a kind of Mn-Cr-W series air-cooled bainitic steels is characterized in that comprising following composition, and its weight percent is:
C 0.06～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～2.00wt.％；
Cr 0.10～2.00wt.％；
W 0.10～1.00wt.％；
Surplus is Fe.
2, air-cooled bainitic steels as claimed in claim 1 is characterized in that wherein the weight percent of main alloy element is:
C 0.06～0.29wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～2.00wt.％；
Cr 0.30～2.00wt.％；
W 0.20～1.00wt.％。
3, air-cooled bainitic steels as claimed in claim 1 is characterized in that wherein the weight percent of main alloy element is:
C 0.35～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.90～2.00wt.％；
Cr 0.30～2.00wt.％；
W 0.20～1.00wt.％。
4, air-cooled bainitic steels as claimed in claim 1 is characterized in that wherein the weight percent of main alloy element is:
C 0.29～0.55wt.％；
Mn 1.90～3.00wt.％；
Si 0.20～0.90wt.％；
Cr 0.30～1.00wt.％；
W 0.30～1.00wt.％。
5, air-cooled bainitic steels as claimed in claim 1 is characterized in that also comprising following alloying element, and its weight percent is:
V 0.03～0.10wt.％；
Nb 0.03～0.10wt.％；
B 0.001～0.004wt.％；
Mo 0.05～0.50wt.％；
Ni 0.20～3.00wt.％；
Ti ≤0.10wt.％；
S 0.04～0.1wt.％；
Ca 0.001～0.01wt.％。
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534403A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Bainite heat-treated steel rail and heat treatment method thereof |
| CN104120362A (en) * | 2014-06-27 | 2014-10-29 | 苏州市盛百威包装设备有限公司 | High-toughness spring steel and preparation method thereof |
| CN105734402A (en) * | 2016-02-19 | 2016-07-06 | 燕山大学 | Low-carbon martensite steel for railway frog and preparation method of low-carbon martensite steel |
| CN107151759A (en) * | 2017-06-02 | 2017-09-12 | 重庆大学 | It is a kind of to be used to preparing heavy-duty forging die has under the conditions of high temperature heavy load extraordinary cast steel and preparation method thereof |
| CN113094812A (en) * | 2021-04-01 | 2021-07-09 | 烟台大学 | Fire impact isolation method using variable cross-section rod structure |
-
2006
- 2006-05-12 CN CN 200610078770 patent/CN1844435A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102534403A (en) * | 2010-12-17 | 2012-07-04 | 鞍钢股份有限公司 | Bainite heat-treated steel rail and heat treatment method thereof |
| CN104120362A (en) * | 2014-06-27 | 2014-10-29 | 苏州市盛百威包装设备有限公司 | High-toughness spring steel and preparation method thereof |
| CN104120362B (en) * | 2014-06-27 | 2017-02-01 | 慈溪智江机械科技有限公司 | High-toughness spring steel and preparation method thereof |
| CN105734402A (en) * | 2016-02-19 | 2016-07-06 | 燕山大学 | Low-carbon martensite steel for railway frog and preparation method of low-carbon martensite steel |
| CN105734402B (en) * | 2016-02-19 | 2017-08-25 | 燕山大学 | Railroad frog low-carbon martensitic steels and preparation method thereof |
| CN107151759A (en) * | 2017-06-02 | 2017-09-12 | 重庆大学 | It is a kind of to be used to preparing heavy-duty forging die has under the conditions of high temperature heavy load extraordinary cast steel and preparation method thereof |
| CN113094812A (en) * | 2021-04-01 | 2021-07-09 | 烟台大学 | Fire impact isolation method using variable cross-section rod structure |
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