CN109468532A - A kind of transmission gear steel and its production method - Google Patents

A kind of transmission gear steel and its production method Download PDF

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Publication number
CN109468532A
CN109468532A CN201811315758.9A CN201811315758A CN109468532A CN 109468532 A CN109468532 A CN 109468532A CN 201811315758 A CN201811315758 A CN 201811315758A CN 109468532 A CN109468532 A CN 109468532A
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Prior art keywords
furnace
gear steel
steel
transmission gear
refining
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CN201811315758.9A
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CN109468532B (en
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涛雅
周彦
惠志国
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Baotou Iron and Steel Group Co Ltd
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Baotou Iron and Steel Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0006Adding metallic additives
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/06Deoxidising, e.g. killing
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04Removing impurities by adding a treating agent
    • C21C7/076Use of slags or fluxes as treating agents
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21CPROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10Handling in a vacuum
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C33/00Making ferrous alloys
    • C22C33/04Making ferrous alloys by melting
    • C22C33/06Making ferrous alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/06Ferrous alloys, e.g. steel alloys containing aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/18Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/22Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

Abstract

The present invention provides a kind of transmission gear steel and its production method, wherein the ingredient of the gear steel is by mass percentage are as follows: C:0.20~0.22%;Si:0.23~0.25%;Mn:0.84~0.86%;P:0.011~0.017%;S:0.004~0.007%;Al:0.008~0.012%;Cr:1.16~1.20%;Mo:0.41~0.44%;Remaining is Fe and inevitable impurity.The gear steel that the present invention obtains reached hardenability band within 4HRC, grain size reach 7 grades or more, and pinion steel properties stability further enhances.

Description

A kind of transmission gear steel and its production method
Technical field
The invention belongs to field of metallurgy, and in particular to a kind of transmission gear steel and its production method more particularly to one Kind speed coach transmission gear steel and its production method.
Background technique
Recently, with automotive light weight technology and environmental protection and the demand for saving the automobile industry developments such as fuel oil, setting for gear is improved Meter stress requires oneself Main way through developing as domestic and international Automobile Gear Steels of steel high intensity, and still, pinion steel makes Often occur the problems such as core harden ability is insufficient, the control of end hardenability band is wider in, will go out after a period of time use Existing gear performance is unstable, causes user's more gear changing difficult, and there may be a series of safety problems, therefore improve pinion steel The stability of performance becomes the task of top priority.
The ending quenching hardness range of automobile axle pinion steel is 33-41HRC at present, hardenability band is wanted in 8HRC, grain size It asks up to 5 grades or more.
The content of background technology part is only the technology that inventor is known, not the existing skill of natural representative this field Art.
Summary of the invention
For the prior art, there are one or more of problems, and in one aspect of the invention, the present invention provides one kind Transmission gear steel, the ingredient of the gear steel is by mass percentage are as follows: C:0.20~0.22%;Si:0.23~ 0.25%;Mn:0.84~0.86%;P:0.011~0.017%;S:0.004~0.007%;Al:0.008~0.012%; Cr:1.16~1.20%;Mo:0.41~0.44%;Remaining is Fe and inevitable impurity.
Preferably, the ingredient of said gear steel is by mass percentage are as follows: C:0.21%;Si:0.24%;Mn: 0.85%;P:0.015%;S:0.006%;Al:0.010%;Cr:1.18%;Mo:0.42%;Remaining is for Fe and unavoidably Impurity.
Preferably, said gear steel hardenability band within 4HRC, grain size reach 7 grades or more.
In another aspect of this invention, the present invention provides the production method of above-mentioned transmission gear steel, the sides Method includes:
Converter producing, the refining of LF furnace, the processing of VD furnace, continuous casting and rolling.
Preferably, ingredient of the above-mentioned converter producing with molten iron comprising following mass percentage: P≤0.13%; S≤ 0.050%;Cr:0.70-0.90%;Mo:0.25-0.35%.
Preferably, the molten steel obtained after above-mentioned converter producing includes the ingredient of following mass percentage: C:0.10- 0.13%;P:0.010-0.020%.
Preferably, above-mentioned tapping temperature are as follows: 1624-1650 DEG C.
It preferably, further include that lime 3900-4300kg, dolomite 2100-2700kg, iron is added in above-mentioned converter producing Skin 2000-3200kg slag making.
It preferably, further include that silicomanganese 1050kg is added in above-mentioned converter producing, ferrosilicon 150kg carries out deoxidation alloying.
Preferably, in above-mentioned LF furnace refining, it is 1500-1545 DEG C that the LF furnace, which refines temperature in place,;Refine temperature of offing normal It is 1630-1636 DEG C;The refining treatment time is 58-87min.
Preferably, above-mentioned LF furnace refining further includes that calcium carbide 0-80kg, fluorite 0-80kg slag making is added.
Preferably, above-mentioned LF furnace refining further includes that manganese iron 0-100kg, ferrosilicon 0-50kg, molybdenum-iron 780-900kg tune is added It saves the LF furnace and refines ingredient in place.
Preferably, after above-mentioned VD furnace processing, gas content requirement in molten steel: O≤20ppm;N≤80ppm; H≤ 2.5ppm;And/or the deep vacuum time of VD furnace processing is all larger than 13min, deep vacuum degree≤0.10Kpa, the soft blow time is 10-15min;Soft blow flow is 50-60Nl/min;Temperature of appearing on the stage is 1574-1610 DEG C.
Preferably, in above-mentioned continuous casting the degree of superheat control between 20-33 DEG C, pulling rate 0.50m/min-0.56m/min it Between.
Based on above technical scheme, the present inventor is only selected before smelting starts by reasonable narrow ingredient design It selects using Cr and Mo raw metal and specific heat treatment process, the gear steel of acquisition has reached hardenability band in 4HRC Within, grain size reach 7 grades or more, and pinion steel properties stability further enhances.
Specific embodiment
Hereinafter, certain exemplary embodiments are simply just described.As one skilled in the art will recognize that Like that, without departing from the spirit or scope of the present invention, described embodiment can be modified by various different modes. Therefore, it is described below and is considered essentially illustrative rather than limits
The object of the present invention is to provide a kind of hardenability bands within 4HRC, grain size reaches 7 grades or more of gear steel, It is realized especially by following implementation:
In the first embodiment of the present invention, the present invention provides a kind of transmission gear steel, the gear steel Ingredient is by mass percentage are as follows: C:0.20~0.22%;Si:0.23~0.25%;Mn:0.84~0.86%;P:0.011~ 0.017%;S:0.004~0.007%;Al:0.008~0.012%;Cr:1.16~1.20%;Mo:0.41~0.44%; Remaining is Fe and inevitable impurity.
According to the preferred embodiment of the present invention, the ingredient of said gear steel is by mass percentage are as follows: C:0.21%; Si:0.24%;Mn:0.85%;P:0.015%;S:0.006%;Al:0.010%;Cr:1.18%;Mo:0.42%;Remaining For Fe and inevitable impurity.
According to the preferred embodiment of the present invention, said gear steel hardenability band within 4HRC, grain size reach 7 grades More than.
In second embodiment of the present invention, the present invention provides the preparation methods of said gear steel, comprising steps of Converter producing, the refining of LF furnace, the processing of VD furnace and continuous casting.
1, converter producing
To guarantee product quality and to the accurate control of finished product ingredient, for the requirement of converter molten iron: phosphorus contains by weight percent Amount is less than or equal to 0.13%, and sulfur content is less than or equal to 0.050%;And the mass percentage of Cr and Mo in the molten iron used Respectively 0.70-0.90% and 0.25-0.35%.Lime, dolomite, fluorite, iron sheet etc. are added in converter steelmaking process to make Slag auxiliary material, according to finished product protects harden ability automatic steel component requirements in tapping process ferrosilicon, silicomanganese and aluminium silicomanganese is added and taken off Oxygen alloy.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as follows:
It is 1624-1650 DEG C of tapping temperature, 1630 DEG C average;Carbon content 0.10-0.13%, average 0.11%;Phosphorus content 0.010-0.020%, average 0.013%;
2, LF furnace refines
It is 1500-1545 DEG C of temperature in place of the refining of LF furnace, 1532 DEG C average;Refining is offed normal 1630-1636 DEG C of temperature, average 1634℃;Refining treatment time 58-87min, average 62min;And molybdenum-iron is added by standard analysis requirement in the refining later period.
3, VD furnace is handled
Molten steel through VD furnace Fruit storage, further decreases pernicious gas content in steel again, improves the cleanliness of steel, gas Body content requirement: [O]≤20ppm;[N]≤80ppm;[H]≤2.5ppm.It feeds silicon-calcium wire and carries out inclusion modification.It is required that VD The deep vacuum time that furnace is smelted is both greater than 13min, deep vacuum degree≤0.10Kpa, soft blow time 10-15min, average 13min;It is soft Wind drift amount 50-60Nl/min, average 53Nl/min;1574-1610 DEG C of temperature of appearing on the stage, it is 1576 DEG C average.
4, continuous casting
Degree of superheat control is between 20-33 DEG C in continuous casting, and pulling rate is between 0.50m/min-0.56m/min;
Hereinafter, preferred embodiments of the present invention will be described, it should be understood that preferred embodiment described herein is only used In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment
Industrial production 3 furnaces, specific process parameter control are as follows:
1) converter producing
Lime 3900-4300kg, dolomite 2100-2700kg, iron sheet 2000- is added when converter smelting according to the actual situation Silicomanganese 1050kg, ferrosilicon 150kg are added in tapping process by 3200kg.
The carbon content of converter terminal molten steel, phosphorus content (mass percent) and tapping temperature are as shown in table 1.
Table 1: the ingredient and temperature of converter tapping
2) LF furnace refines
The refining of LF furnace carries out plus auxiliary material slag making according to molten steel composition and temperature change, and adduction gold is finely adjusted and heats up behaviour Make.Calcium carbide 0-80kg, fluorite 0-80kg is added, alloy is finely adjusted manganese iron 0-100kg, ferrosilicon 0- according to ingredient in place is refined 50kg, molybdenum-iron 780-900kg feed aluminum steel 150m, and liquid steel temperature and processing time are shown in Table 2.
Table 2: refining LF furnace temperature control
3) VD furnace is handled
Molten steel further decreases pernicious gas content in steel through VD furnace Fruit storage after ladle LF refining, improves steel Cleanliness, gas content requirement: [O]≤20ppm;[N]≤90ppm;[H]≤2.5ppm feeds silicon-calcium wire 100m after refining Carry out inclusion modification.It is required that the deep vacuum time that VD furnace is smelted both greater than is equal to 13min, other technological parameters are shown in Table 3.
Table 3: refining VD furnace technology control
4) continuous casting
Degree of superheat control is between 22-33 DEG C in continuous casting, and pulling rate is between 0.50m/min-0.56m/min, molten steel Ingredient (mass percent) control it is as shown in table 4.
Table 4: finished product ingredient (%)
5) surface quality
Continuous casting billet goes out burial pit, the non-discovery table facial cleft in the continuous casting billet surface of furnace 1- furnace 3 in slow cooling 48 hours or more into burial pit The defects of line, fully meets the surface quality requirements of production hot rolled circular steel.
Rolling, which is carried out, according to the continuous casting billet that the above furnace 1, furnace 2, furnace 3 are prepared obtains the tooth that specification is ∮ 210- ∮ 270mm Wheel uses steel.Grain size is at 7 grades or more after 980 DEG C/6 hours high-temperature carburizings, by normalizing in 925 DEG C/1 hour, 925 DEG C of ends Hardenability band is respectively less than 4HRC after quenching.
Finally, it should be noted that the foregoing is only a preferred embodiment of the present invention, it is not intended to restrict the invention, Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features. All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention Within protection scope.

Claims (8)

1. a kind of transmission gear steel, which is characterized in that the ingredient of the gear steel is by mass percentage are as follows:
C:0.20~0.22%;
Si:0.23~0.25%;
Mn:0.84~0.86%;
P:0.011~0.017%;
S:0.004~0.007%;
Al:0.008~0.012%;
Cr:1.16~1.20%;
Mo:0.41~0.44%;
Remaining is Fe and inevitable impurity.
2. transmission gear steel described in claim 1, which is characterized in that the ingredient of the gear steel is by mass percentage Are as follows:
C:0.21%;
Si:0.24%;
Mn:0.85%;
P:0.015%;
S:0.006%;
Al:0.010%;
Cr:1.18%;
Mo:0.42%;
Remaining is Fe and inevitable impurity.
3. transmission gear steel of any of claims 1 or 2, which is characterized in that the gear steel hardenability band is in 4HRC Within, grain size reach 7 grades or more.
4. the production method of transmission gear steel of any of claims 1-3, which is characterized in that the method packet It includes:
Converter producing, the refining of LF furnace, the processing of VD furnace, continuous casting and rolling.
5. the production method of transmission gear steel as claimed in claim 4, which is characterized in that the converter producing ladle Ingredient containing following mass percentage: P≤0.13%;S≤0.050%;Cr:0.70-0.90%;Mo:0.25-0.35%; And/or
The molten steel obtained after the converter producing includes the ingredient of following mass percentage: C:0.10-0.13%;P:0.010- 0.020%;And/or
The tapping temperature are as follows: 1624-1650 DEG C;And/or
It further include that lime 3900-4300kg, dolomite 2100-2700kg, iron sheet 2000-3200kg is added in the converter producing Slag making;And/or
It further include that silicomanganese 1050kg is added in the converter producing, ferrosilicon 150kg carries out deoxidation alloying.
6. the production method of transmission gear steel as claimed in claim 4, which is characterized in that described in the LF furnace refining It is 1500-1545 DEG C that LF furnace, which refines temperature in place,;Refining temperature of offing normal is 1630-1636 DEG C;The refining treatment time is 58- 87min;And/or
The LF furnace refining further includes that calcium carbide 0-80kg, fluorite 0-80kg slag making is added;And/or
The LF furnace refining further includes that manganese iron 0-100kg is added, and ferrosilicon 0-50kg, molybdenum-iron 780-900kg adjust the LF furnace essence Refine ingredient in place.
7. the production method of transmission gear steel as claimed in claim 4, which is characterized in that after the VD furnace processing, molten steel Middle gas content requirement: O≤20ppm;N≤80ppm;H≤2.5ppm;And/or
The deep vacuum time of the VD furnace processing is all larger than 13min, deep vacuum degree≤0.10Kpa, and the soft blow time is 10-15min; Soft blow flow is 50-60Nl/min;Temperature of appearing on the stage is 1574-1610 DEG C.
8. the production method of transmission gear steel as claimed in claim 4, which is characterized in that the degree of superheat controls in the continuous casting Between 20-33 DEG C, pulling rate is between 0.50m/min-0.56m/min.
CN201811315758.9A 2018-11-06 2018-11-06 Steel for transmission gear and production method thereof Active CN109468532B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109972024A (en) * 2019-05-13 2019-07-05 中天钢铁集团有限公司 A kind of preparation method of pinion steel Steel Bar and preparation method thereof and rod iron
CN110747397A (en) * 2019-11-05 2020-02-04 宝钢特钢韶关有限公司 Round steel for gear and preparation method thereof, gear part and preparation method thereof

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Publication number Priority date Publication date Assignee Title
CN109972024A (en) * 2019-05-13 2019-07-05 中天钢铁集团有限公司 A kind of preparation method of pinion steel Steel Bar and preparation method thereof and rod iron
CN109972024B (en) * 2019-05-13 2020-06-05 中天钢铁集团有限公司 Steel for gear steel bar and preparation method thereof and preparation method of steel bar
CN110747397A (en) * 2019-11-05 2020-02-04 宝钢特钢韶关有限公司 Round steel for gear and preparation method thereof, gear part and preparation method thereof

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