CN109402498A - A kind of high-temperature carburizing pinion steel and its manufacturing method - Google Patents

A kind of high-temperature carburizing pinion steel and its manufacturing method Download PDF

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CN109402498A
CN109402498A CN201810994814.XA CN201810994814A CN109402498A CN 109402498 A CN109402498 A CN 109402498A CN 201810994814 A CN201810994814 A CN 201810994814A CN 109402498 A CN109402498 A CN 109402498A
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temperature
steel
slag
carburizing
continuous casting
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CN109402498B (en
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刘年富
岳峰
包锋
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Baowu JFE Special Steel Co Ltd
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Baosteel Special Steel Shaoguan 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
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • 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
    • C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
    • 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
    • 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
    • C21C7/10—Handling in a vacuum
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium
    • 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
    • C22C38/28—Ferrous alloys, e.g. steel alloys containing chromium with titanium or zirconium
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/20—Carburising
    • C23C8/22—Carburising of ferrous surfaces
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The present invention relates to a kind of V, Ti combined microalloying high-temperature carburizing pinion steel and its manufacturing method, its chemical component by percentage to the quality are as follows: C:0.16~0.20%, Si :≤0.08%, Mn:0.90~1.10%, Cr:1.25~1.40%, V:0.02~0.04%, 0.015≤Ti < 0.020%, Al:0.008~0.015%, N:0.0080~0.0120%, P :≤0.025%, S:0.015~0.025%, O :≤0.0013%, remaining is Fe and inevitable impurity.Ensure to be formed enough V (C, N) and Ti (C, N) precipitated phase pinning crystal boundary inhibits crystal grain to grow up, autstenitic grain size is stablized at 7.0-8.0 grades, improves gear using fatigue life, production cost is effectively reduced；And the Al content in strict control steel prevents from forming a large amount of Al by Al content control in lower range2O3Brittle inclusion blocks the mouth of a river, it is ensured that and it is stable and controllable for quality, realize more furnace continuous casting productions.

Description

A kind of high-temperature carburizing pinion steel and its manufacturing method
Technical field
The invention belongs to special steel class technical fields, more particularly, to a kind of high-temperature carburizing automobile tooth of combined microalloying Wheel uses steel.
Background technique
In recent years, domestic high-temperature carburizing technology starts to apply in gear parts company.A large number of studies show that carburizing When temperature is improved by conventional 920~930 DEG C to 950 DEG C, the carburizing period can reduce by 30% or so, and carburizing temperature improve to At 1000 DEG C, the carburizing period can reduce by 55% or so.But the carburizing temperature of common pinion steel occurs when reaching 950 DEG C A small amount of coarse austenite grain, is easy to cause gear shifting quadrant texturing to greatly reduce gear service performance；And 1000 DEG C of carburizing temperature When, there are a large amount of coarse austenite grains, gear part is caused to be scrapped.
Currently, it is abnormal coarse in order to not occur gear austenite grain after high-temperature carburizing, it is mainly few by addition Nb, Ti alloy of amount, by forming Nb (C, N) and Ti (C, N) Pinning crystal boundary, to inhibit Austenite Grain Growth.Specially Sharp CN103361559A discloses a kind of Nb, Ti combined microalloying high-temperature carburizing pinion steel.Pass through addition 0.02~0.06% Ti, 0.02~0.06% Nb and 0.015~0.035% Al, formed Ti (C, N) and Nb (C, N) precipitated phase pinning crystal boundary, this Steel grade keeps the temperature 1 hour and 6 hours at 1000 DEG C, and autstenitic grain size is able to maintain at 8.0 grades or more, does not find that mixed crystal is existing As.But a large amount of Nb of addition, it is easy to cause slab cracked, and production cost is caused to increase considerably, therefore be difficult reality Existing industrialized production.
Gear high-temperature carburizing austenite grain is coarse in order to prevent, there are also using to add a large amount of Al, N alloys, by Al/N ratio Control, by forming a large amount of AlN precipitated phase, inhibits Austenite Grain Growth in an OK range.Patent CN102560255A discloses a kind of high-temperature vacuum carburized gear steel.By addition 0.033%~0.055% Al, 0.016~ 0.030% N, and by the control of Al/N ratio in 0.60~1.80 range, the pinion steel 1000 DEG C after vacuum carburization 4 hours it is brilliant Grain is maintained at 7.0~8.0 grades.But in molten steel continuous casting, a large amount of Al is formd because adding a large amount of Al2O3, not can be removed easily Tundish Nozzle Clogging During Continuous Casting is caused, causes casting difficult, cannot achieve continuous production.Meanwhile there are excessive Al in steel2O3 Field trash reduces the fatigue behaviour of gear.
Summary of the invention
To solve the above problems, the present invention provides a kind of high-temperature carburizing pinion steel and its manufacturing method, by reasonably at Sub-control system combines corresponding smelting program, reaches reduction production cost, and realize the purpose of continuous casting production.
To achieve the above object, the technical solution of the present invention is as follows:
A kind of high-temperature carburizing pinion steel, by percentage to the quality its Design of Chemical Composition are as follows: C:0.16~0.20%, Si :≤ 0.08%, Mn:0.90~1.10%, Cr:1.25~1.40%, V:0.02~0.04%, 0.015≤Ti < 0.020%, Al:0.008 ~0.015%, N:0.0080~0.0120%, P :≤0.025%, S:0.015~0.025%, O :≤0.0013%, remaining for Fe and Inevitable impurity.
In composition of steel of the present invention design, in order to solve cost problem, a small amount of V microalloy element is added in steel, takes Disappeared Nb addition and reduce Ti content, production cost is effectively reduced.
Above-mentioned high-temperature carburizing pinion steel is prepared, is included the following steps:
Step 1: converter smelting, 20% or so steel scrap is added into converter, is then blended into molten iron and is smelted, terminal tapping control Target processed: C >=0.08%, P≤0.015%, tapping process carry out slide plate pushing off the slag operation, reduce slag；It taps after starting about 90 seconds When start alloying, addition sequence are as follows: ferro-aluminum~carbon dust~alloy~lime, wherein the control of alfer additional amount 80 ± 20kg；Ensure tapping temperature >=1610 DEG C；
Step 2: LF ladle furnace refining, control basicity of slag is 2.0~3.0, while controlling Ar throughput, prevents molten steel from turning over Rolling is severe to generate slag；Take top of the slag double deoxidizer and the comprehensive deoxidation of silicon carbide diffusive deoxidation, top of the slag double deoxidizer dosage >=150kg smelts middle and later periods addition silicon carbide >=80kg, a small amount of ferrosilicon powder safeguards clinker；
Step 3: RH vacuum outgas, is vacuum-treated after 5min molten steel and ferrotianium fixed nitrogen is added, vacuum degree is in 0.266kPa or less Holding >=18min, advantageously reduces large inclusions；In order to ensure nitrogen is stably and controllable, it is vacuum-treated using whole nitrogen blowing Nitrogen pick-up mends after vacuum processing and feeds the line nitrogen pick-up of nitrogen chromium；After vacuum processing, forbids carrying out Calcium treatment, prevent from forming Ca, Al Complex inclusion blocks the mouth of a river；After vacuum processing, ladle is hung into soft blow argon station and carries out the operation of soft blow argon, keeps Argon 20min or more, to promote the floating of field trash to assemble removal, soft argon blowing rate is not to blow break face and the top of the slag slightly fluctuates and is Standard forbids molten steel exposed；
Step 4: continuous casting, continuous casting process is protected using big packet long nozzle argon envelope, the immersion of middle water-coating port, middle covering agent, crystallizer The measures such as slag carry out whole process protection casting to molten steel, and basket pouring temperature is controlled at 1533 ± 10 DEG C, carried out using permanent pulling rate Casting, while using the internal soundness of the technological measures such as M-EMS, secondary cooling water weak cold improvement slab.To prevent Slab generates micro-crack, progress high temperature slow cooling in burial pit is hung in after slab cutting, it is necessary to ensure that enter to cheat surface temperature >=610 ℃。
Step 5: taking round steel original mold to intend carburizing quenching process, technique at round steel slab heating rolling are as follows: 1010, 1020 DEG C and 1030 DEG C of temperature keep the temperature progress carburizing in 2 hours, 4 hours and 6 hours, then are quenched at 860 DEG C, 200 DEG C of progress Tempering.
In manufacturing method design of the present invention, the stopper curve of strict control continuous casting process is also answered in continuous casting working procedure, keeps pouring The stable state of casting process stopper curve controls.
The beneficial effects of the present invention are: designing using V, Ti combined microalloying, in ingredient design, ensuring to form foot The V (C, N) and Ti (C, N) precipitated phase pinning crystal boundary of amount inhibit crystal grain to grow up, and production cost is effectively reduced.
The internal oxidition degree of crystal boundary when in order to reduce gear high-temperature carburizing, by the Si content design control in steel in lower model In enclosing.
And Al is reduced in conjunction with the effective control for smelting low oxygen content by design low al content (0.008~0.015%)2O3 Brittle inclusion forming quantity；Forbid Calcium treatment after taking vacuum, and extends soft argon blowing time and large-sized inclusions floating is promoted to go It removes, greatly reduces enrichment of the field trash on the inside of the mouth of a river, realize the stable state control of casting process stopper curve, prevent stopper bent Line fluctuates suddenly is involved in large-sized inclusions, at least 6 furnace continuous castings production may be implemented, while significantly improving gear using tired The labor service life；
It takes slab high temperature to enter to cheat slow cooling, prevents slab and round steel from generating micro-crack, it is ensured that the round steel ultrasonic examination of rolling Qualification rate reaches 99.5% or more, improves Qualified Products Rate.The ingredient and technological design are taken, Gear Processing enterprise is simulated High-temperature carburizing technique, by laboratory carburizing quenching process > 1000 DEG C~1030 DEG C keep the temperature 2~6h, autstenitic grain size keep At 7.5~8.0 grades, no mixed crystal phenomenon；The gear steel product by promote Gear Processing enterprise greater than 1000 DEG C at a temperature of seep Carbon, autstenitic grain size are maintained at 7.5~8.0 grades, and the carburizing period can be greatly shortened in no mixed crystal phenomenon, improve production efficiency, Reduce production cost.
Specific embodiment
Using chemical composition ranges of the present invention, melting chemical composition (wt%) such as table of the embodiment 1,2,3 of manufacture Shown in 1；Take converter smelting, LF refining and RH refining and billet continuous casting, by a few furnace heating steel billets of smelting be rolled into 30mm~ The round steel of 60mm specification, round steel, which is taken, to be rolled rear the natural type of cooling and is cooled to room temperature, and manufacturing process situation is as shown in table 2.To circle Steel carries out offline chamfered edge, aligning and carries out ultrasonic examination, the tissue feelings of sample detection round steel by the A grade of national standard GB/T 4162 Condition, ultrasonic examination and round steel testing result are as shown in table 3, and do not detect large scale brittleness B class of the width greater than 15um and press from both sides Sundries.The round steel of rolling is subjected to simulation carburizing and quenching test, simulates carburizing quenching process are as follows: respectively at 1010 DEG C, 1020 DEG C With the progress carburizing in 2 hours, 4 hours and 6 hours of 1030 DEG C of temperature inside holdings, then quenched at 860 DEG C, 200 DEG C be tempered. Then its autstenitic grain size is evaluated according to standard GB/T 6394, the result is shown in shown in table 4.
1 V, Ti microalloying gear steel chemical composition (Wt, %) of table
Table 2 smelts continuous casting process situation
3 pinion steel hoc scenario of table
Table 4 simulates high-temperature carburizing pinion steel autstenitic grain size
Stably and controllable using pinion steel continuous casting process produced by the invention, stopper curve controlled is steady, it can be achieved that continuous 6 furnace casting There is not micro-crack in the round steel of production, slab and rolling, and round steel ultrasonic flaw detection qualification rate is very high；Non-metallic inclusion control Preferably, especially brittle B class, D type impurity rank are lower for system, and are greater than the B type impurity of 15um without width, are conducive to That improves gear uses fatigue life.Using lower V, Ti microalloying, still can ensure that use > 1000 DEG C~1030 DEG C, 2~ The high-temperature carburizing austenite grain of 6h is not grown up, and can effectively realize inexpensive mass production；The new gear steel simultaneously Applied to Gear Processing enterprise, the gear wheel carburization period can be effectively shortened under higher carburizing temperature conditions, reduce production cost.

Claims (7)

1. a kind of high-temperature carburizing pinion steel, it is characterised in that its component is by weight percentage:
C:0.16~0.20%, Si :≤0.08%, Mn:0.90~1.10%, Cr:1.25~1.40%, V:0.02~0.04%, 0.015≤Ti < 0.020%, Al:0.008~0.015%, N:0.0080~0.0120%, P :≤0.025%, S:0.015~ 0.025%, O :≤0.0013%, remaining is Fe and inevitable impurity.
2. a kind of high-temperature carburizing pinion steel as described in claim 1, it is characterised in that: the V:0.026~0.031%, Ti: 0.017%~0.018%.
3. a kind of high-temperature carburizing pinion steel as claimed in claim 1 or 2, it is characterised in that: for the B type impurity in control steel Quantity, rank and large inclusions, Al/N are controlled 1.0~1.8.
4. a kind of manufacturing method of high-temperature carburizing pinion steel as claimed in claim 1 or 2, includes the following steps:
(1) converter smelting: 20% or so steel scrap being added into converter, and tapping process carries out slide plate pushing off the slag operation, reduces slag, Start alloying when tapping after starting about 90 seconds, 80 ± 20kg alfer amount is added and carries out pre-deoxidation；
(2) LF ladle furnace refining: control basicity of slag is 2.0~3.0, while controlling Ar throughput, prevents molten steel rolling strict Evil generates slag；Take the comprehensive deoxidation of top of the slag double deoxidizer and silicon carbide diffusive deoxidation, top of the slag double deoxidizer dosage >= 150kg smelts middle and later periods addition silicon carbide >=80kg；
(3) RH vacuum outgas: molten steel is vacuum-treated after 5min, ferrotianium fixed nitrogen is added, vacuum degree is kept in 0.266kPa or less ≥18min；Whole nitrogen blowing nitrogen pick-up mends after vacuum processing and feeds the line nitrogen pick-up of nitrogen chromium；After treatment forbids Calcium treatment；It is soft Argon 20min or more promotes the floating of field trash to assemble removal；
(4) continuous casting: continuous casting process uses big packet long nozzle argon envelope, the immersion of middle water-coating port, middle covering agent, crystallizer protecting residue etc. Measure carries out whole process protection casting to molten steel, and basket pouring temperature is controlled at 1533 ± 10 DEG C, is poured using permanent pulling rate, Improve the internal soundness of slab using technological measures such as M-EMS, secondary cooling water weak colds；To prevent slab from generating Micro-crack hangs in progress high temperature slow cooling in burial pit, it is necessary to ensure that enter to cheat surface temperature >=610 DEG C after slab cutting；
(5) high-temperature carburizing is heat-treated: to continuous casting billet heating rolling at different size round steel, round steel simulation high-temperature carburizing processing is taken, Carburizing temperature is > 1000 DEG C~1030 DEG C, and soaking time is 2~6h, and the grain size number of high-temperature carburizing is 7.0~8.0 grades, nothing Mixed crystal phenomenon.
5. a kind of manufacturing method of high-temperature carburizing pinion steel as claimed in claim 4, it is characterized in that: step (4) continuous casting Process also answers the stopper curve of strict control continuous casting process, keeps the stable state control of casting process stopper curve.
6. a kind of manufacturing method of high-temperature carburizing pinion steel as claimed in claim 3, includes the following steps:
(1) converter smelting: 20% or so steel scrap being added into converter, and tapping process carries out slide plate pushing off the slag operation, reduces slag, Start alloying when tapping after starting about 90 seconds, 80 ± 20kg alfer amount is added and carries out pre-deoxidation；
(2) LF ladle furnace refining: control basicity of slag is 2.0~3.0, while controlling Ar throughput, prevents molten steel rolling strict Evil generates slag；Take the comprehensive deoxidation of top of the slag double deoxidizer and silicon carbide diffusive deoxidation, top of the slag double deoxidizer dosage >= 150kg smelts middle and later periods addition silicon carbide >=80kg；
(3) RH vacuum outgas: molten steel is vacuum-treated after 5min, ferrotianium fixed nitrogen is added, vacuum degree is kept in 0.266kPa or less ≥18min；Whole nitrogen blowing nitrogen pick-up mends after vacuum processing and feeds the line nitrogen pick-up of nitrogen chromium；After treatment forbids Calcium treatment；It is soft Argon 20min or more promotes the floating of field trash to assemble removal；
(4) continuous casting: continuous casting process uses big packet long nozzle argon envelope, the immersion of middle water-coating port, middle covering agent, crystallizer protecting residue etc. Measure carries out whole process protection casting to molten steel, and basket pouring temperature is controlled at 1533 ± 10 DEG C, is poured using permanent pulling rate, Improve the internal soundness of slab using technological measures such as M-EMS, secondary cooling water weak colds；To prevent slab from generating Micro-crack hangs in progress high temperature slow cooling in burial pit, it is necessary to ensure that enter to cheat surface temperature >=610 DEG C after slab cutting；
(5) high-temperature carburizing is heat-treated: to continuous casting billet heating rolling at different size round steel, round steel simulation high-temperature carburizing processing is taken, Carburizing temperature is > 1000 DEG C~1030 DEG C, and soaking time is 2~6h, and the grain size number of high-temperature carburizing is 7.0~8.0 grades, nothing Mixed crystal phenomenon.
7. a kind of manufacturing method of high-temperature carburizing pinion steel as claimed in claim 6, it is characterized in that: step (4) continuous casting Process also answers the stopper curve of strict control continuous casting process, keeps the stable state control of casting process stopper curve.
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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110172638A (en) * 2019-05-10 2019-08-27 武汉钢铁有限公司 A kind of high-temperature carburizing pinion steel and production method
CN110373607A (en) * 2019-07-25 2019-10-25 广东韶钢松山股份有限公司 A kind of H10Cr4Mo4Ni4V, high-temperature carburizing steel member and preparation method
CN111766257A (en) * 2020-07-08 2020-10-13 宝钢特钢韶关有限公司 Steel austenite grain boundary display method and steel austenite grain size evaluation method
CN112593036A (en) * 2020-11-30 2021-04-02 江苏联峰能源装备有限公司 Low-silicon microalloyed high-temperature carburized gear steel and manufacturing method thereof
CN115261715A (en) * 2021-04-29 2022-11-01 宝山钢铁股份有限公司 High-temperature carburized gear shaft steel and manufacturing method thereof
CN116024497A (en) * 2022-12-26 2023-04-28 首钢集团有限公司 Gear steel and preparation method thereof

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