CN107904497A - A kind of high life bearing steel and its manufacture method - Google Patents

A kind of high life bearing steel and its manufacture method Download PDF

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CN107904497A
CN107904497A CN201711332432.2A CN201711332432A CN107904497A CN 107904497 A CN107904497 A CN 107904497A CN 201711332432 A CN201711332432 A CN 201711332432A CN 107904497 A CN107904497 A CN 107904497A
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steel
bearing steel
temperature
high life
rolling
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CN107904497B (en
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王棣
张灵通
朱林林
信霖
李文双
王洪钦
王涛
刘菲
张刚
付鹏冲
马恒续
李富刚
杨玉国
成广超
夏应兵
张良
郭金龙
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Xi Wang Metal Technology Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Rolling Contact Bearings (AREA)
  • Heat Treatment Of Steel (AREA)
  • Treatment Of Steel In Its Molten State (AREA)

Abstract

The invention discloses one kind the present invention provides high life bearing steel, steel trade mark XWGCr15A, comprising：Carbon 0.95~1.03%, silicon 0.25~0.30%, manganese 0.30~0.40%, chromium 1.48~1.58%, aluminium 0.010~0.035%, phosphorus≤0.012%, sulphur≤0.010%, titanium≤0.0015%, oxygen≤0.0006%, nitrogen≤0.0040%, arsenic≤0.03%, lead≤0.002%, calcium≤0.001%, trace element：Nickel 0.04~0.07%, molybdenum 0.03~0.05%, copper 0.02~0.06%.The present invention ensures that high life bearing steel has more preferable, more stable performance, the service life of higher by unique composition design.

Description

A kind of high life bearing steel and its manufacture method
Technical field
The present invention relates to bearing steel manufacturing technology field, more particularly to a kind of high life bearing steel, steel trade mark XWGCr15A Composition design and manufacture method.
Background technology
Bearing is a kind of very important parts in contemporary mechanical equipment, its major function be supporting rotating shaft or its Its movable body, guiding rotation or moving movement simultaneously bear the load being transmitted to by axis or parts on shaft.Its performance, precision and Reliability plays conclusive effect to the normal work using main body.
Bearing is with a very important position in mechanical industry as important base parts and components, its manufacture.Present bearing row Industry also there are no small gap, is mainly shown as high accuracy, high technology content, high added value, Long Life Products in face of demand Ratio universal relatively low, product stability and novelty are further improved etc..
Therefore, how to design and develop and a kind of possess the new of higher cleanliness, high-performance stability and high service life Type bearing steel just becomes urgent problem to be solved.
The content of the invention
The present invention provides one kind aiming at above-mentioned defect, and the present invention provides a kind of high life bearing steel, steel The composition design and manufacture method of trade mark XWGCr15A, by redesigning, optimizing and revising the content of each element in bearing steel, adds Trace element is added to carry out microalloying, effective to ensure that bearing steel has a high cleanliness factor, high stability and antifatigue Performance, has reached the requirement of high life.
A kind of high life bearing steel and its manufacture method technical solution of the present invention is that the bearing composition of steel includes：Carbon 0.95~1.03%, silicon 0.25~0.30%, manganese 0.30~0.40%, chromium 1.48~1.58%, aluminium 0.010~0.035%, phosphorus ≤ 0.012%, sulphur≤0.010%, titanium≤0.0015%, oxygen≤0.0006%, nitrogen≤0.0040%, arsenic≤0.03%, lead≤ 0.002%, calcium≤0.001%, trace element：Nickel 0.04~0.07%, molybdenum 0.03~0.05%, copper 0.02~0.06%.This Invention ensures that high life bearing steel has more preferable, more stable performance by unique composition design.
Preferably, the bearing composition of steel includes：Carbon 0.96~0.98%, silicon 0.26~0.28%, manganese 0.34~ 0.36%, chromium 1.51~1.55%, aluminium 0.018~0.025%, phosphorus≤0.008%, sulphur≤0.006%, titanium≤0.0015%, Oxygen≤0.0006%, nitrogen≤0.0040%, arsenic≤0.012%, lead≤0.002%, calcium≤0.001%, trace element：Nickel 0.04 ~0.06%, molybdenum 0.03~0.05%, copper 0.02~0.04%.
The effect of micro- Ni：The addition of nickel can improve the intensity of steel, and keep steel good plasticity and toughness. Nickel can reduce the brittle transition temperature of steel low temperature, improve the low-temperature flexibility of steel.Nickel has acid, alkaline environment higher corrosion-resistant Ability, there is antirust and temperature capacity at high temperature.Therefore, the addition 0.04%-0.07% of nickel in steel is designed.
The effect of micro- Mo：Molybdenum can make the crystal grain refinement of steel, improve quenching degree and thermostrength, keep at high temperature Enough intensity and creep resisting ability, it is possible to increase the mechanical performance of steel, can also suppress crisp caused by the quenching of steel Property.
The effect of micro- Cu：Copper can improve the weather-resistance of steel, and be conducive to improve steel intensity, Wearability and yield tensile ratio.
Effective control carbon segregation.Composition design is by reducing the scope of carbon, compared to the requirement of national standard, upper limit drop Low 0.02%, the effective index for controlling carbon segregation.
The B classes of the bearing steel, D type impurities are controlled at≤0.5 grade；DS type impurities are controlled at≤0.5 grade, are only allowed Occur 1 time.
Banded structure≤2.0 grade of the bearing steel, liquation≤1.0 grade.
A kind of manufacture method of high life bearing steel, comprises the following steps：
S1, by just refining, refining process control Oxygen Content of Bearing Steel≤0.0006%, Ti content≤0.0015%；
S2, using primary sedimentation deoxidation mode, with reference to refining slag system and vacuum is kept and soft blow step, realizes high life axis Hold the high-cleanness, high design requirement of steel；Basicity refining slag system during refining slag system uses, basicity of slag R=4-7, according to 85 tons of tap Calculate, refining lime is incorporated 400 kilograms -800 kilograms/stove, high alkalinity high alumina 300 kilograms/stove of refining slag is public with addition of 30-50 Jin carborundum.
S3, homogenized technology (abbreviation PMO) using pulse magneto vibration solidification, significantly improves Center Equiaxial Crystal area, Equiaxial crystal ratio reaches 50~90%, and crystallite dimension is significantly refined, and strand macrostructure significantly improves, and eliminates shrinkage cavity；Drop Low carbon segregation index, high life bearing steel strand carbon segregation index are controlled in 0.93-1.06.
After S4, heating continuous casting billet, once rolling and slow cooling are carried out to continuous casting billet；Rolling requirements steel temperature control system is 1150 ℃-1220℃.After being rolled into the specification required by secondary rolling, it need to ensure that 600 DEG C -650 DEG C of blank enters to cheat slow cooling, go out to cheat temperature 150 DEG C of ＜.By a heating rolling, the presence of primary carbide, proeutectoid carbide is eliminated, coordinates high temperature heavy reduction to roll System, eliminates core tissue defects, improves the interior tissue of steel.Handled, be met by slow cooling, finishing after the completion of rolling A rolling steel billet required by follow-up secondary rolling.
After S5, a heating rolling steel billet, secondary rolling and secondary slow cooling are carried out to a rolling steel billet.Specific steps For：Blank surface is cleared up, checked after going out hole, carry out reheating after qualified to steel billet, steel billet temperature after reheating Control is at 1050 DEG C -1100 DEG C；Rolling need to regulate and control it into trip temperature when completing, i.e., cools down as early as possible after finish to gauge, make its temperature Spend prompt drop to 700 DEG C or so, then carry out it is secondary enter to cheat slow cooling, go out to cheat 100 DEG C of temperature ＜.
It is different from and once heats, reheating rolls the problems such as emphasis solves carbide three times and skin decarburization, by prolonging When rolling, control finishing temperature, optimization retarded cooling process, finishing detection etc. means, obtain final bar.
S2 is specifically, with reference to CaO-SiO2-Al2O3Ternary slag system diagram, by CaO/Al2O3Control is realized 1.2~2.0 Oxygen content≤0.0006%；Under the molten steel environment of hypoxemia, by the irregular Al in molten steel2O3Class oxidation category inclusion modification To ball-type 12CaO7Al2O3Easy to float, it is achieved thereby that the high-cleanness, high of molten steel；The vacuum retention time is 25-30min；It is soft It is 20-25min to blow the time.
PMO technologies are that pulse current is imported to the coil being wrapped on the outside of strand in S3, so as to be produced in solid liquid interface forward position Raw electromagnetic induction effect, achievees the purpose that thinning solidification structure.
Equipment is mainly made of the pulse power, PMO coils, crystallizer.Steel billet with wick-containing is worn after crystallizer disengaging PMO coils are crossed, after pulling rate stabilization, unbalanced pulse power supply carries out pulse magneto oscillation treatment.The current peak used is 102Ki A, discharge frequency are 247hi Hz, and pulse width is 34bi ms (Ki, hi, bi are related with power supply natures).
When a heating time is small no less than 9 in S4；Latter end, 1230 DEG C -1250 DEG C of soaking zone temperature are heated, wherein preceding four The more conventional product drafts of passage improves 15mm-20mm；Such as the first passage routine drafts is 115mm, then when producing the steel grade Drafts control in 120mm or so, and so on to four-pass, to ensure penetrating for roll-force.Dry in the air after ending base to 1020 Finish rolling is carried out after DEG C -1050 DEG C；Slow cooling is cold using cheating, when temperature retention time is small no less than 48.
Reheating time control is when 5.5 is small or so in S5；Heat latter end, 950 DEG C -1000 DEG C of soaking zone temperature；Eventually Roll 850 DEG C -920 DEG C of temperature；Slow cooling, which enters, cheats temperature >=400 DEG C, when temperature retention time is small no less than 60.
Beneficial effects of the present invention are：The high life bearing steel of the present invention, steel trade mark XWGCr15A, passes through the weight to component New design and micro- alloying, and every control measure in manufacturing process so that the bearing steel produced has more High cleanliness factor, more stable mechanical property, more preferable wearability, realizes the fatigue life of higher, made using the technology The high speed performance index D n values for the bearing made can reach 3.3 × 106。
Figure of description：
Fig. 1 show CaO-SiO2-Al2O3Ternary slag system diagram；
Fig. 2 show Al2O3 type impurity patterns；
Fig. 3 show 12CaO7Al2O3 type impurity patterns；
Fig. 4 show B type impurity patterns；
Fig. 5 show D type impurity patterns；
Fig. 6 show carbide strip pattern；
Fig. 7 show carbide liquid-extraction pattern.
Embodiment：
For a better understanding of the present invention, below with instantiation come the technical solution that the present invention will be described in detail, but this Invention is not limited thereto.
Embodiment 1
(1) high life bearing steel composition design and control
The high life bearing steel designed in the present embodiment, it specifically includes following component：
Carbon 0.95~1.03%, silicon 0.25~0.30%, manganese 0.30~0.40%, chromium 1.48~1.58%, aluminium 0.010~ 0.035%, phosphorus≤0.012%, sulphur≤0.010%, titanium≤0.0015%, oxygen≤0.0006%, nitrogen≤0.0040%, arsenic≤ 0.03%, lead≤0.002%, calcium≤0.001%, trace element：Nickel 0.04~0.07%, molybdenum 0.03~0.05%, copper 0.02 ~0.06%.
Therefore, the composition more than designs, and the Composition Control measured value in implementation process is shown in Table 1：
Table 1 surveys chemical Composition Control scope %
During high life bearing steel is manufactured, process capability control characteristic Cpk >=1.67 of actual control composition, reach It is horizontal to A+ grades, reach design requirement, specific heat (batch) number component of testing is shown in Table 2.
Table 2 surveys chemical Composition Control scope %
(2) manufacture method of high life bearing steel
S1, using different metal redox principle, by accurate first refining, refining operation, realizes high life bearing steel Oxygen content≤0.0006%, Ti content≤0.0015%.
Specifically, first with manufacture at first furnace initial stage high alkalinity, high oxidative, with reference to low temperature feature early period, will just refine The Ti content of stove tapping is controlled≤0.0005%；With reference to metal oxidation reduction principle, root different metal oxidation sequencing, turns Stove tapping process settles alloy at one go with steel stream, and upper line traffic control in pressing, utilizes " oxygen-enriched gesture ", [O] ＞ 200ppm, by molten steel and Titanium elements in alloy are oxidized to TiO2, and blow floating with BOTTOM ARGON BLOWING to the top of the slag.
Before LF refining starts, first carry out deslagging or take off Slag treatment, TiO will be contained2Slag once exclude；Again slag making, will Deoxidier is once added to position, avoids the later stage from adding, and keeps the Argon of whole refining process；When vacuum refining process keeps vacuum Between stablize in 25-30min, soft blow time 20-25min, it is achieved thereby that high life bearing steel Ti content≤0.0015%, oxygen contain Amount≤0.0006%.
S2, it is the refining slag system being well combined and the holding of enough vacuum and soft blow time, real with primary sedimentation deoxidation mode The high-cleanness, high design requirement of high life bearing steel is showed.
Specifically, with reference to the deoxidation mode in step S1, the one-time-reach-place amount of deoxidier Al is controlled in 0.055%- 0.065%, the later stage carries out top of the slag diffusive deoxidation using 20-30 kilograms of carborundum；With reference to CaO-SiO2-Al2O3Ternary slag system phase The deoxidation ideal zone (see Figure of description Fig. 1) of aluminum killed steel in figure, by A values (CaO/Al2O3) control 1.2~2.0, Realize oxygen content≤0.0006%.Under the molten steel environment of hypoxemia, by the irregular Al in molten steel2O3Class aoxidizes type impurity It is denatured ball-type 12CaO7Al2O3Easy to float (see Figure of description Fig. 2), it is achieved thereby that the high-cleanness, high of molten steel.
By the realization of step S1 and S2, the inclusion behavior of actual measurement high life bearing steel is shown in Table 3, specific metallographic pattern See Figure of description Fig. 3.
3 high life of table bearing steel measured value
S3, is homogenized technology (abbreviation PMO) using pulse magneto vibration solidification, significantly improves Center Equiaxial Crystal area, Equiaxial crystal ratio reaches 50~90%, and crystallite dimension is significantly refined, and strand macrostructure significantly improves, and eliminates shrinkage cavity；Drop Low carbon segregation index, high life bearing steel strand carbon segregation index are controlled in 0.93-1.06.
Pulse magneto vibration (abbreviation PMO) is that pulse current is imported to the coil being wrapped on the outside of strand, so that in solid-liquid Interface forward position produces specific electromagnetic induction effect, achievees the purpose that thinning solidification structure.Pulse current is in continuous casting billet solid-liquid circle In front along formation inductive impulse magnetic field；Magnetic field causes molten steel to be subcooled, and promotes forming core；Nucleus takes off under electromagnetic force and gravity Fall, sink, formed " crystalline rain ", so as to smash original nucleation mode, expand the area of equiax crystal, reduce carbon segregation Index.Carbon segregation value is carried out by using carbon sulphur instrument to strand to analyze, the control of high life bearing steel strand carbon segregation index In 0.93-1.06.
After S4, heating continuous casting billet, once rolling and slow cooling are carried out to continuous casting billet.
Heating rolling uses high-temperature diffusion process, i.e., when heating time is small no less than 9, heating latter end, soaking temperature 1230 DEG C -1250 DEG C, coordinate high temperature heavy reduction split rolling method, eliminate the presence of primary carbide, proeutectoid carbide, eliminate Core tissue defects, improve the interior tissue of steel.
Handled after the completion of rolling by slow cooling, finishing, a rolling steel billet being met required by follow-up secondary rolling.
After S5, a heating rolling steel billet, secondary rolling and secondary slow cooling are carried out to a rolling steel billet.It is different from once The problems such as heating, reheating rolling emphasis solves carbide three times and skin decarburization, pass through the rolling that is delayed, control finish to gauge temperature The means such as degree, optimization retarded cooling process, finishing detection, obtain final bar.
The high life bearing steel of the present invention, steel trade mark XWGCr15A, is closed by the redesign to component and trace element Every control measure in aurification, and manufacturing process so that the bearing steel produced has the cleanliness factor of higher, more stable Mechanical property, more preferable wearability realize fatigue life of higher, and the high speed performance using the bearing manufactured by the technology refers to Number Dn values can reach 3.3 × 106。

Claims (8)

1. a kind of high life bearing steel, it is characterised in that the bearing composition of steel includes：Carbon 0.95~1.03%, silicon 0.25~ 0.30%, manganese 0.30~0.40%, chromium 1.48~1.58%, aluminium 0.010~0.035%, phosphorus≤0.012%, sulphur≤ 0.010%, titanium≤0.0015%, oxygen≤0.0006%, nitrogen≤0.0040%, arsenic≤0.03%, lead≤0.002%, calcium≤ 0.001%, trace element：Nickel 0.04~0.07%, molybdenum 0.03~0.05%, copper 0.02~0.06%.
2. a kind of high life bearing steel according to claim 1, it is characterised in that the bearing composition of steel includes：Carbon 0.96~0.98%, silicon 0.26~0.28%, manganese 0.34~0.36%, chromium 1.51~1.55%, aluminium 0.018~0.025%, phosphorus ≤ 0.008%, sulphur≤0.006%, titanium≤0.0015%, oxygen≤0.0006%, nitrogen≤0.0040%, arsenic≤0.012%, lead≤ 0.002%, calcium≤0.001%, trace element：Nickel 0.04~0.06%, molybdenum 0.03~0.05%, copper 0.02~0.04%.
3. a kind of high life bearing steel according to claim 1, it is characterised in that B classes, the D classes of the bearing steel are mingled with Thing is controlled at≤0.5 grade；DS type impurities are controlled at≤0.5 grade, only allow to occur 1 time.
A kind of 4. high life bearing steel according to claim 1, it is characterised in that the banded structure of the bearing steel≤ 2.0 grades, liquation≤1.0 grade.
5. a kind of manufacture method of high life bearing steel as claimed in claim 1, it is characterised in that comprise the following steps：
S1, by just refining, refining process control Oxygen Content of Bearing Steel≤0.0006%, Ti content≤0.0015%；
S2, using primary sedimentation deoxidation mode, with reference to refining slag system and vacuum is kept and soft blow step, realizes high life bearing steel High-cleanness, high design requirement；Basicity refining slag system during the refining slag system uses, basicity of slag R=4-7；
S3, homogenized technology using pulse magneto vibration solidification, significantly improves Center Equiaxial Crystal area, equiaxial crystal ratio reaches 50 ~90%, crystallite dimension is significantly refined, and strand macrostructure significantly improves, and eliminates shrinkage cavity；Carbon segregation index is reduced, High life bearing steel strand carbon segregation index is controlled in 0.93-1.06.
After S4, heating continuous casting billet, once rolling and slow cooling are carried out to continuous casting billet；1150 DEG C -1220 DEG C of a rolled steel temperature；Rolling Into after the specification required by secondary rolling, 600 DEG C -650 DEG C of blank enters to cheat slow cooling, goes out to cheat 150 DEG C of temperature ＜；
After S5, a heating rolling steel billet, secondary rolling and secondary slow cooling are carried out to a rolling steel billet；Step is：After going out hole Blank surface is cleared up, is checked, carries out reheating after qualified to steel billet, after reheating steel billet temperature 1050 DEG C- 1100℃；Rolling need to regulate and control it into trip temperature when completing, i.e., cools down as early as possible after finish to gauge, make its temperature prompt drop to 700 DEG C Left and right, then carry out it is secondary enter to cheat slow cooling, go out to cheat 100 DEG C of temperature ＜.
A kind of 6. manufacture method of high life bearing steel according to claim 5, it is characterised in that S2 specifically, with reference to CaO-SiO2-Al2O3Ternary slag system diagram, by CaO/Al2O3Control realizes oxygen content≤0.0006% 1.2~2.0； Under the molten steel environment of hypoxemia, by the irregular Al in molten steel2O3Class oxidation category inclusion modification is to ball-type 12CaO7Al2O3Just In floating, it is achieved thereby that the high-cleanness, high of molten steel；The vacuum retention time is 25-30min；The soft blow time is 20-25min.
7. the manufacture method of a kind of high life bearing steel according to claim 5, it is characterised in that when once being heated in S4 Between no less than 9 it is small when；Heat latter end, 1230 DEG C -1250 DEG C of soaking zone temperature, end dry in the air after base to 1020 DEG C -1050 DEG C it is laggard Row finish rolling；Slow cooling is cold using cheating, when temperature retention time is small no less than 48.
8. the manufacture method of a kind of high life bearing steel according to claim 5, it is characterised in that in S5 during reheating Between control when 5.5 is small or so；Heat latter end, 950 DEG C -1000 DEG C of soaking zone temperature；850 DEG C -920 DEG C of finishing temperature；Slow cooling Enter and cheat temperature >=400 DEG C, when temperature retention time is small no less than 60.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111926255A (en) * 2020-08-11 2020-11-13 江苏联峰实业有限公司 High-carbon chromium bearing steel and production method thereof
CN113751683A (en) * 2021-09-08 2021-12-07 天津市新天钢钢铁集团有限公司 Method for improving internal quality of SWRH82B billet
CN116837288A (en) * 2023-06-29 2023-10-03 本钢板材股份有限公司 Nb-containing high-strength and high-toughness fine grain size GCr15 bearing steel material and preparation method thereof

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