CN103589957A - CrMnTi series gear steel production method - Google Patents
CrMnTi series gear steel production method Download PDFInfo
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Abstract
The invention relates to a CrMnTi series gear steel, which comprises the following components by weight percentage: 0.17%-0.22% of C, 0.18%-0.30% of Si, 0.80%-1.10% of Mn, 1.00%-1.20% of Cr, less than or equal to 0.030% of S, less than or equal to 0.030% of P, 0.04-0.08% of Ti, less than or equal to 0.20% of Cu, less than or equal to 0.20% of Ni, less than or equal to 0.05% of Mo, less than or equal to 20*10<-6> of O, less than or equal to 2*10<-6> of H and less than or equal to 70*10<-6> of N, Fe is a main component, the preparation method is characterized in that Fe is smelt through a converter, then is carried out with LR refine treatment, and is performed with vacuum treatment through a RH furnace, then is carried out with continuous casting again and rolling to prepare the CrMnTi series gear steel. The produce CrMnTi series gear steel has long life characteristic, and the full uniformization of molten steel component and hardenability stabilization of end part of the gear steel can be ensured, thereby the quality stabilization of the gear steel product can be ensured.
Description
Technical field
The invention belongs to special steel manufacturing technology field, the CrMnTi that is specifically related to use for wheel box, gear, the bridge drive assembly of vehicle manufacture, engineering machinery etc. is Pinion Steel method for manufacturing.
Background technology
Pinion Steel is just towards future developments such as low oxygen content long lifetime, low cost, easy processing, and long lifetime, low cost are its main features.Along with the development of Domestic Automotive Industry, Automobile Gear Steels demand constantly increases, simultaneously to requiring also more and more higher its work-ing life.At present, both at home and abroad the oxygen level of Pinion Steel is required to be controlled at 20 * 10
-6below, more domestic advanced levels are controlled at 15 * 10
-6below, international most advanced level is 12 * 10
-6below.
Publication number CN1O1O96742, the patent of invention of " high-strength pinion steel for vehicles " by name, by adding micro-Nb, V, improve Pinion Steel grain fineness number, hardening capacity and bandwidth thereof, added the Mo of the Nb of 0.015-0.080%, the V of 0.03-0.09% and 0.15-0.55%, owing to having added a certain proportion of Nb, V, Mo precious metal, manufacturing cost is relatively high.
Publication number CN 102011057 A, the patent of invention of by name " a kind of CrMnTi is Pinion Steel and complete processing thereof ", mainly adopts special formula and complete processing production cost is low, operation is simplified, hardening capacity is stable, production efficiency is high, product mechanical property is good, easily processing and long-life Pinion Steel.In this patent composition proportioning, Mn, Cr content control higher, and wherein the working control of Mn content is at 0.97-1.03%, and the working control of Cr content is at 1.13-1.18%, and adopt cooling controlling and rolling controlling process and roll rear retarded cooling process.This patent is not mentioned Control for Oxygen Content situation.
Publication number CN 101633974A, by name " a kind of smelting process of ultra low oxygen steel ", main Shi testing laboratory adopts crucible to smelt, by Control for Oxygen Content below 20ppm.
Publication number CN 1676621A, by name " suboxide steel production method ", for the low-carbon (LC)s such as auto sheet, Ultra-low carbon aluminium killed steel sheet material, by converter, RH refining by Control for Oxygen Content below 25ppm.Publication number is CN 102634628A, and by name " a kind of optimization method of producing low-oxygen steel by converter " produced for GCr15 bearing steel converter smelting, by Control for Oxygen Content 10 * 10
-6below.
Publication number CN103146883A, " smelting process of sulfur-bearing hypoxemia Pinion Steel " by name, its principal character is that by adopting, electrosmelting, LF refining, VD Fruit storage are controlled at more than 0.030% by the S content in Pinion Steel simultaneously, O content is controlled at 10 * 10
-6below.This patent not mentioned for the Pinion Steel of which kind of series, also not mentioned alloying constituent is controlled situation.
The production method of the low oxygen content steel more than providing is all unfavorable for low oxygen content and lower-cost control simultaneously.The present invention is directed to the requirement of the deficiencies in the prior art and Pinion Steel development, Development and Production a kind of hypoxemia long lifetime, stable performance and the lower CrMnTi of production cost be Pinion Steel.
Summary of the invention
In order to overcome the above-mentioned shortcoming of prior art
,the invention provides a kind of stable performance, easily processing, prolongation in work-ing life, and the lower CrMnTi of production cost is Pinion Steel method for manufacturing.
The technical solution adopted for the present invention to solve the technical problems is: a kind of CrMnTi is Pinion Steel, its component and weight percent thereof are: C:0.17%-0.22%, Si:0.18%-0.30%, Mn:0.80%-1.10%, Cr:1.00%-1.20%, S≤0.030%, P≤0.030%, Ti:0.04%-0.08%, Cu≤0.20%, Ni≤0.20%, Mo≤0.05%, O≤20 * 10
-6, H≤2 * 10
-6, N≤70 * 10
-6, Fe is main body composition.Its manufacture method is as follows:
The first step: converter smelting; The strict terminal C that controls controls >=0.08%, the lower slag of the terminal of controlling well tapping;
Second step: LR refining treatment, the ladle that the first step is prepared carries out thermometric, sampling, and add in batches the slag making materials of adjusting mobility, and progressively add composite deoxidant to carry out top of the slag diffusive deoxidation, the refining middle and later periods adds reductor to protect slag according to the situation of slag, refining process is controlled the basicity of refining slag well within the scope of 2.5mmol/L～5.0 mmol/L, in the process of refining, be constantly blown into argon gas and fully stir, promote slag-metal reaction to make deoxidation products floating, refining process is progressively finely tuned and is comprised C, Si, Mn, each element of Cr, departures composition is adjusted to and approached target component, guarantee that the good and slag look of slag fluidity bleaches, the Ar Pressure of simultaneously controlling well prevents the severe volume that produces of molten steel rolling,
The 3rd step: RH stove vacuum-treat; The RH stove of molten steel being put into vacuum pressure 266Pa carries out Fruit storage, treatment time >=15min, by the Control for Oxygen Content in steel below 20ppm, thereby lengthen the high vacuum time gets rid of the gas in steel as far as possible to greatest extent; Vacuum starts rear several minutes sampling, determines oxygen, complete as early as possible trimming, according to remaining Ti situation, after starting 3min, vacuum cycle adds fast ferrotianium, adjust Ti composition, after vacuum breaker, hello Ca line and Fe line carry out inclusion conditioning processing, Ca drops into carbonization rice husk insulation immediately after processing, and carries out the processing of soft blow argon, treatment time >=12min;
The 4th step: continuous casting; Adopt the low overheat of 15 ℃～40 ℃, the horizontal pulling rate of 0.55 ± 0.02m/min, in casting process, wrap temperature fluctuation ± 5 ℃ constant temperature, whole process protection casting, middle bag adds carbonized rice husks insulating covering agent, crystallizer adds mould flux, in control, water-coating port depth of penetration is stabilized in 110 ± 10mm, adopt M-EMS, two cold weak cold controls, guarantee strand straightening temperature >=850 ℃, control the structure organization of continuously cast bloom well, produce the high-quality continuously cast bloom of free of surface defects, casting blank stacking surpass 28h or >=500 ℃ redly send processing;
The 5th step: rolling; Strand or the red steel billet that send after slow cooling is processed heat, and Heating temperature is 1110-1240 ℃.Start rolling temperature is controlled as >=1100 ℃, and finishing temperature is controlled as >=850 ℃, and finally making CrMnTi is Pinion Steel.
The invention has the beneficial effects as follows: by above various measures; to smelting the omnidistance CrMnTi of control, it is the oxygen level in Pinion Steel; converter tapping carries out pre-deoxidation; refining process carries out strong deoxidation; casting process whole process protection is cast and is reduced secondary oxidation of steel, finally the oxygen level in steel can be stablized and is controlled at 15 * 10
-6below, the Pinion Steel of production has long-life feature;
By controlling external refining time, the soft argon blowing time of ladle, and adopt low overheat, induction stirring, constant temperature constant speed casting process, reduce the segregation of C, Mn etc., guaranteed end hardening capacity stable of full and uniformization of molten steel composition and Pinion Steel, thereby guaranteed Pinion Steel constant product quality.
Accompanying drawing explanation
Fig. 1 is that three groups of embodiment 20CrMnTiH Pinion Steels are smelted roll control schematic diagram;
Fig. 2 is three groups of embodiment 20CrMnTiH Pinion Steel embodiment chemical composition schematic diagram;
Fig. 3 is the schematic diagram of three groups of embodiment Microstructure and properties of 20CrMnTiH Pinion Steel.
Embodiment
Be a Pinion Steel, its component and weight percent thereof are: C:0.17%-0.22%, Si:0.18%-0.30%, Mn:0.80-1.10%, Cr:1.00%-1.20%, S≤0.030%, P≤0.030%, Ti:0.04%-0.08%, Cu≤0.20%, Ni≤0.20%, Mo≤0.05%, O≤20 * 10
-6, H≤2 * 10
-6, N≤70 * 10
-6, Fe is main body composition.
Its manufacture method is as follows:
The first step: converter smelting; The strict terminal C that controls controls >=0.08%, the lower slag of the terminal of controlling well tapping;
Second step: LR refining treatment, the ladle that the first step is prepared carries out thermometric, sampling, and add in batches the slag making materials of adjusting mobility, and progressively add composite deoxidant to carry out top of the slag diffusive deoxidation, the refining middle and later periods adds reductor to protect slag according to the situation of slag, refining process is controlled the basicity of refining slag well within the scope of 2.5mmol/L～5.0 mmol/L, in the process of refining, be constantly blown into argon gas and fully stir, promote slag-metal reaction to make deoxidation products floating, refining process is progressively finely tuned and is comprised C, Si, Mn, each element of Cr, departures composition is adjusted to and approached target component, guarantee that the good and slag look of slag fluidity bleaches, the Ar Pressure of simultaneously controlling well prevents the severe volume that produces of molten steel rolling,
The 3rd step: RH stove vacuum-treat, the RH stove of molten steel being put into vacuum pressure 266Pa carries out Fruit storage, treatment time >=15min, hydrogen richness in steel is controlled at below 20ppm, thereby lengthening the high vacuum time gets rid of the gas in steel to greatest extent as far as possible, vacuum starts rear several minutes sampling, determine oxygen, complete as early as possible trimming, according to remaining Ti situation, after starting 3min, vacuum cycle adds fast ferrotianium, adjust Ti composition, after vacuum breaker, hello Ca line and Fe line carry out inclusion conditioning processing, Ca drops into carbonization rice husk insulation immediately after processing, and carry out the processing of soft blow argon, treatment time >=12min,
The 4th step: continuous casting; Adopt the low overheat of 15 ℃～40 ℃, the horizontal pulling rate of 0.55 ± 0.02m/min, in casting process, wrap temperature fluctuation ± 5 ℃ constant temperature, whole process protection casting, middle bag adds carbonized rice husks insulating covering agent, crystallizer adds mould flux, in control, water-coating port depth of penetration is stabilized in 110 ± 10mm, adopt M-EMS, two cold weak cold controls, guarantee strand straightening temperature >=850 ℃, control the structure organization of continuously cast bloom well, produce the high-quality continuously cast bloom of free of surface defects, casting blank stacking surpass 28h or >=500 ℃ redly send processing;
The 5th step: rolling; Strand or the red steel billet that send after slow cooling is processed heat, and Heating temperature is 1110-1240 ℃.Start rolling temperature is controlled as >=1100 ℃, and finishing temperature is controlled as >=850 ℃, and finally making CrMnTi is Pinion Steel.
Embodiment 1: referring to Fig. 1～Fig. 3, a kind of CrMnTi is Pinion Steel, and its component and weight percent thereof are: C:0.20%, Si:0.26%, Mn:0.85%, Cr:1.05%, S:0.001%, P:0.013%, Ti:0.058%, Cu≤0.20%, Ni≤0.20%, Mo≤0.05%, O:12ppm, H≤2 * 10
-6, N≤70 * 10
-6, Fe is main body composition, and first carries out converter smelting, strictly controls terminal C and controls>=0.08%, the lower slag of terminal tapping is controlled good, terminal P≤0.017%, then the ladle the first step being prepared carries out thermometric, sampling, and add in batches the slag making materials of adjusting mobility, and progressively add composite deoxidant to carry out top of the slag diffusive deoxidation, the refining middle and later periods adds reductor to protect slag according to the situation of slag, refining process is controlled the basicity of refining slag well at 4.2mmol/L, in the process of refining, be constantly blown into argon gas and fully stir, promote slag-metal reaction to make deoxidation products floating, refining process is progressively finely tuned and is comprised C, Si, Mn, each element of Cr, departures composition is adjusted to and approached target component, guarantee that the good and slag look of slag fluidity bleaches, the Ar Pressure of simultaneously controlling well prevents the severe volume that produces of molten steel rolling, the RH stove of again molten steel being put into vacuum pressure 123Pa carries out Fruit storage, treatment time is 22min, by the Control for Oxygen Content in steel below 20ppm, thereby lengthening the high vacuum time gets rid of the gas in steel to greatest extent as far as possible, vacuum starts rear several minutes sampling, determine oxygen, complete as early as possible trimming, according to remaining Ti situation, after starting 3min, vacuum cycle adds fast ferrotianium, adjust Ti composition, after vacuum breaker, hello Ca line and Fe line carry out inclusion conditioning processing, Ca drops into carbonization rice husk insulation immediately after processing, and carry out the processing of soft blow argon, treatment time>=12min, adopt again the low overheat of 27 ℃～42 ℃, the horizontal pulling rate of 0.55 ± 0.02m/min, in casting process, wrap temperature fluctuation ± 5 ℃ constant temperature, whole process protection casting, middle bag adds carbonized rice husks insulating covering agent, crystallizer adds mould flux, in control, water-coating port depth of penetration is stabilized in 110 ± 10mm, adopt M-EMS, two cold weak cold controls, guarantee strand straightening temperature>=850 ℃, control the structure organization of continuously cast bloom well, produce the high-quality continuously cast bloom of free of surface defects, casting blank stacking surpass 28h or>=500 ℃ redly send processing, strand or the red steel billet that send after finally slow cooling being processed heat, and Heating temperature is 1170 ℃～1208 ℃, heating 322min, and it is 1144 ℃ that start rolling temperature is controlled, and it is 924 ℃ that finishing temperature is controlled, and finally making CrMnTi is Pinion Steel.
Embodiment 2: referring to Fig. 1～Fig. 3, a kind of CrMnTi is Pinion Steel, and its component and weight percent thereof are: C:0.19%, Si:0.27%, Mn:0.84%, Cr:1.05%, S:0.001%, P:0.013%, Ti:0.058%, Cu≤0.20%, Ni≤0.20%, Mo≤0.05%, O:8ppm, H≤2 * 10
-6, N≤70 * 10
-6, Fe is main body composition, and first carries out converter smelting, strictly controls terminal C and controls>=0.08%, the lower slag of terminal tapping is controlled good, terminal P≤0.017%, then the ladle the first step being prepared carries out thermometric, sampling, and add in batches the slag making materials of adjusting mobility, and progressively add composite deoxidant to carry out top of the slag diffusive deoxidation, the refining middle and later periods adds reductor to protect slag according to the situation of slag, refining process is controlled the basicity of refining slag well at 3.5mmol/L, in the process of refining, be constantly blown into argon gas and fully stir, promote slag-metal reaction to make deoxidation products floating, refining process is progressively finely tuned and is comprised C, Si, Mn, each element of Cr, departures composition is adjusted to and approached target component, guarantee that the good and slag look of slag fluidity bleaches, the Ar Pressure of simultaneously controlling well prevents the severe volume that produces of molten steel rolling, the RH stove of again molten steel being put into vacuum pressure 141Pa carries out Fruit storage, treatment time is 21min, by the Control for Oxygen Content in steel below 20ppm, thereby lengthening the high vacuum time gets rid of the gas in steel to greatest extent as far as possible, vacuum starts rear several minutes sampling, determines oxygen, completes as early as possible trimming, according to remaining Ti situation, after starting 3min, vacuum cycle adds fast ferrotianium, adjust Ti composition, after vacuum breaker, hello Ca line and Fe line carry out inclusion conditioning processing, and Ca drops into carbonization rice husk insulation immediately after processing, and carry out the processing of soft blow argon, treatment time>=12min, adopt again the low overheat of 27 ℃～42 ℃, the horizontal pulling rate of 0.55 ± 0.02m/min, in casting process, wrap temperature fluctuation ± 5 ℃ constant temperature, whole process protection casting, middle bag adds carbonized rice husks insulating covering agent, crystallizer adds mould flux, in control, water-coating port depth of penetration is stabilized in 110 ± 10mm, adopt M-EMS, two cold weak cold controls, guarantee strand straightening temperature>=850 ℃, control the structure organization of continuously cast bloom well, produce the high-quality continuously cast bloom of free of surface defects, casting blank stacking surpass 28h or>=500 ℃ redly send processing, strand or the red steel billet that send after finally slow cooling being processed heat, and Heating temperature is 1164 ℃～1194 ℃, heating 310min, and it is 1135 ℃ that start rolling temperature is controlled, and it is 932 ℃ that finishing temperature is controlled, and finally making CrMnTi is Pinion Steel.
Embodiment 3: referring to Fig. 1～Fig. 3, a kind of CrMnTi is Pinion Steel, and its component and weight percent thereof are: C:0.20%, Si:0.25%, Mn:0.85%, Cr:1.05%, S:0.004%, P:0.08%, Ti:0.055%, Cu≤0.20%, Ni≤0.20%, Mo≤0.05%, O:9ppm, H≤2 * 10
-6, N≤70 * 10
-6, Fe is main body composition, and first carries out converter smelting, strictly controls terminal C and controls>=0.08%, the lower slag of terminal tapping is controlled good, terminal P≤0.017%, then the ladle the first step being prepared carries out thermometric, sampling, and add in batches the slag making materials of adjusting mobility, and progressively add composite deoxidant to carry out top of the slag diffusive deoxidation, the refining middle and later periods adds reductor to protect slag according to the situation of slag, refining process is controlled the basicity of refining slag well at 3.1mmol/L, in the process of refining, be constantly blown into argon gas and fully stir, promote slag-metal reaction to make deoxidation products floating, refining process is progressively finely tuned and is comprised C, Si, Mn, each element of Cr, departures composition is adjusted to and approached target component, guarantee that the good and slag look of slag fluidity bleaches, the Ar Pressure of simultaneously controlling well prevents the severe volume that produces of molten steel rolling, the RH stove of again molten steel being put into vacuum pressure 95Pa carries out Fruit storage, treatment time is 25min, by the Control for Oxygen Content in steel below 20ppm, thereby lengthening the high vacuum time gets rid of the gas in steel to greatest extent as far as possible, vacuum starts rear several minutes sampling, determines oxygen, completes as early as possible trimming, according to remaining Ti situation, after starting 3min, vacuum cycle adds fast ferrotianium, adjust Ti composition, after vacuum breaker, hello Ca line and Fe line carry out inclusion conditioning processing, and Ca drops into carbonization rice husk insulation immediately after processing, and carry out the processing of soft blow argon, treatment time>=12min, adopt again the low overheat of 27 ℃～42 ℃, the horizontal pulling rate of 0.55 ± 0.02m/min, in casting process, wrap temperature fluctuation ± 5 ℃ constant temperature, whole process protection casting, middle bag adds carbonized rice husks insulating covering agent, crystallizer adds mould flux, in control, water-coating port depth of penetration is stabilized in 110 ± 10mm, adopt M-EMS, two cold weak cold controls, guarantee strand straightening temperature>=850 ℃, control the structure organization of continuously cast bloom well, produce the high-quality continuously cast bloom of free of surface defects, casting blank stacking surpass 28h or>=500 ℃ redly send processing, strand or the red steel billet that send after finally slow cooling being processed heat, and Heating temperature is 1174 ℃～1196 ℃, heating 305min, and it is 1141 ℃ that start rolling temperature is controlled, and it is 936 ℃ that finishing temperature is controlled, and finally making CrMnTi is Pinion Steel.
Referring to table 1, three groups of embodiment chemical compositions, Microstructure and properties results show, the Control for Oxygen Content of 20CrMnTiH Pinion Steel product of the present invention is lower, reaches≤12ppm, has reached advanced international level, has long-life feature; The present invention is controlled at Mn, Cr alloying element the lower limit of standard, has reduced production cost; The Microstructure and properties index of round steel of the present invention is good, constant product quality.
By above various measures; to smelting the omnidistance CrMnTi of control, be the oxygen level in Pinion Steel, converter tapping carries out pre-deoxidation, and refining process carries out strong deoxidation; casting process whole process protection is cast and is reduced secondary oxidation of steel, finally the oxygen level in steel can be stablized and is controlled at 15 * 10
-6below, the Pinion Steel of production has long-life feature.
By controlling external refining time, the soft argon blowing time of ladle, and adopt low overheat, induction stirring, constant temperature constant speed casting process, reduce the segregation of C, Mn etc., guaranteed end hardening capacity stable of full and uniformization of molten steel composition and Pinion Steel, thereby guaranteed Pinion Steel constant product quality.
Claims (2)
1. a CrMnTi is Pinion Steel, it is characterized in that component and weight percent thereof are: C:0.17%-0.22%, Si:0.18%-0.30%, Mn:0.80%-1.10%, Cr:1.00%-1.20%, S≤0.030%, P≤0.030%, Ti:0.04%-0.08%, Cu≤0.20%, Ni≤0.20%, Mo≤0.05%, O≤20 * 10
-6, H≤2 * 10
-6, N≤70 * 10
-6, Fe is main body composition.
2. preparing CrMnTi is as claimed in claim 1 Pinion Steel, it is characterized in that manufacture method is as follows:
The first step: converter smelting; The strict terminal C that controls controls >=0.08%, the lower slag of the terminal of controlling well tapping;
Second step: LR refining treatment, the ladle that the first step is prepared carries out thermometric, sampling, and add in batches the slag making materials of adjusting mobility, and progressively add composite deoxidant to carry out top of the slag diffusive deoxidation, the refining middle and later periods adds reductor to protect slag according to the situation of slag, refining process is controlled the basicity of refining slag well within the scope of 2.5mmol/L～5.0 mmol/L, in the process of refining, be constantly blown into argon gas and fully stir, promote slag-metal reaction to make deoxidation products floating, refining process is progressively finely tuned and is comprised C, Si, Mn, each element of Cr, departures composition is adjusted to and approached target component, guarantee that the good and slag look of slag fluidity bleaches, the Ar Pressure of simultaneously controlling well prevents the severe volume that produces of molten steel rolling,
The 3rd step: RH stove vacuum-treat; The RH stove of molten steel being put into vacuum pressure 266Pa carries out Fruit storage, treatment time >=15min, by the Control for Oxygen Content in steel below 20ppm, thereby lengthen the high vacuum time gets rid of the gas in steel as far as possible to greatest extent; Vacuum starts rear several minutes sampling, determines oxygen, complete as early as possible trimming, according to remaining Ti situation, after starting 3min, vacuum cycle adds fast ferrotianium, adjust Ti composition, after vacuum breaker, hello Ca line and Fe line carry out inclusion conditioning processing, Ca drops into carbonization rice husk insulation immediately after processing, and carries out the processing of soft blow argon, treatment time >=12min;
The 4th step: continuous casting; Adopt the low overheat of 15 ℃～40 ℃, the horizontal pulling rate of 0.55 ± 0.02m/min, in casting process, wrap temperature fluctuation ± 5 ℃ constant temperature, whole process protection casting, middle bag adds carbonized rice husks insulating covering agent, crystallizer adds mould flux, in control, water-coating port depth of penetration is stabilized in 110 ± 10mm, adopt M-EMS, two cold weak cold controls, guarantee strand straightening temperature >=850 ℃, control the structure organization of continuously cast bloom well, produce the high-quality continuously cast bloom of free of surface defects, casting blank stacking surpass 28h or >=500 ℃ redly send processing;
The 5th step: rolling; Strand or the red steel billet that send after slow cooling is processed heat, and Heating temperature is 1110-1240 ℃, and start rolling temperature is controlled as >=1100 ℃, and finishing temperature is controlled as >=850 ℃, and finally making CrMnTi is Pinion Steel.
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| CN103643158A (en) * | 2013-11-28 | 2014-03-19 | 广东韶钢松山股份有限公司 | Low-cost CrMnTi series gear steel and production method thereof |
| CN104212934A (en) * | 2014-09-10 | 2014-12-17 | 广东韶钢松山股份有限公司 | Control method for titanium nitride inclusion of gear steel bar material |
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| CN107502817A (en) * | 2017-08-07 | 2017-12-22 | 河钢股份有限公司邯郸分公司 | High grain size number pinion steel 20CrMnTiH and its production technology |
| CN109402498A (en) * | 2018-08-29 | 2019-03-01 | 宝钢特钢韶关有限公司 | A kind of high-temperature carburizing pinion steel and its manufacturing method |
| CN110230006A (en) * | 2019-05-31 | 2019-09-13 | 邯郸钢铁集团有限责任公司 | A kind of production method of the low-phosphorous pinion steel of automobile gearbox |
| CN112063928A (en) * | 2020-09-17 | 2020-12-11 | 山东钢铁股份有限公司 | High-hardenability and high-carburization rare earth CrMnTi gear steel and preparation method thereof |
| CN112725564A (en) * | 2020-11-17 | 2021-04-30 | 邯郸钢铁集团有限责任公司 | Production method of high-toughness nickel-containing gear steel for heavy-duty transmission |
| CN114196872A (en) * | 2020-09-17 | 2022-03-18 | 宝山钢铁股份有限公司 | High-strength and high-toughness narrow-hardenability 20CrMnTiH gear steel, bar and manufacturing method thereof |
| CN114657469A (en) * | 2022-03-23 | 2022-06-24 | 承德建龙特殊钢有限公司 | CrMnTi gear steel and preparation method and application thereof |
| CN114855062A (en) * | 2022-07-05 | 2022-08-05 | 北京科技大学 | 20CrMnTiH gear steel and preparation method thereof |
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