CN113549814A - Chain steel of carburizing super wear-resistant slag discharging machine - Google Patents

Chain steel of carburizing super wear-resistant slag discharging machine Download PDF

Info

Publication number
CN113549814A
CN113549814A CN202110686054.8A CN202110686054A CN113549814A CN 113549814 A CN113549814 A CN 113549814A CN 202110686054 A CN202110686054 A CN 202110686054A CN 113549814 A CN113549814 A CN 113549814A
Authority
CN
China
Prior art keywords
steel
chain steel
chain
super wear
carburized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN202110686054.8A
Other languages
Chinese (zh)
Other versions
CN113549814B (en
Inventor
黄永建
孙晓明
武兴旺
丁辉
戴观文
李元
王国营
李冠军
李福勇
张士乾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Coal Zhangjiakou Coal Mining Machinery Co Ltd
Shijiazhuang Iron and Steel Co Ltd
Original Assignee
China Coal Zhangjiakou Coal Mining Machinery Co Ltd
Shijiazhuang Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Coal Zhangjiakou Coal Mining Machinery Co Ltd, Shijiazhuang Iron and Steel Co Ltd filed Critical China Coal Zhangjiakou Coal Mining Machinery Co Ltd
Priority to CN202110686054.8A priority Critical patent/CN113549814B/en
Publication of CN113549814A publication Critical patent/CN113549814A/en
Application granted granted Critical
Publication of CN113549814B publication Critical patent/CN113549814B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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
    • 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
    • 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
    • C21D1/26—Methods of annealing
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/005—Heat treatment of ferrous alloys containing Mn
    • 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
    • C21D6/00—Heat treatment of ferrous alloys
    • C21D6/008—Heat treatment of ferrous alloys containing Si
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/005—Ferrite
    • 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
    • C21D2211/00—Microstructure comprising significant phases
    • C21D2211/009—Pearlite
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

A carburization super wear-resistant slag discharging machine chain steel belongs to the technical field of metallurgy. The chain steel comprises the following chemical components in percentage by mass: c: 0.09-0.13%, Si: 0.15 to 0.35%, Mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 1.40-1.70%, Ni: 1.40-1.70%, Mo: 0.25 to 0.35%, Cu: 0.08-0.12%, Al: 0.020-0.050%, and the balance of iron and inevitable impurities. The chain steel has good welding performance, and the carburized chain processed by the chain steel has surface hardness, core hardness of more than or equal to 550HV effective hardened layer depth, breaking load and breaking elongation rate.

Description

Chain steel of carburizing super wear-resistant slag discharging machine
Technical Field
The invention belongs to the technical field of metallurgy, and relates to chain steel, in particular to carburization super-wear-resistant slag extractor chain steel.
Background
With the continuous progress of the thermal power technology in China, the generator set is increasingly developed in a large-scale direction. The problem of rapid abrasion of a chain of the slag extractor or breakage of the chain seriously influences the operation safety of the unit. The slag tapping chain is divided into two series of high strength and high hardness according to the performance characteristics of the product. The high-strength chain has the defects of low hardness, quick abrasion, high chain intercepting frequency, large overhauling workload and the like; the high-hardness chain has the characteristics of high hardness, slow abrasion, small maintenance workload and long service life. At present, the high-hardness chain has no special standard and is generally made of carburizing steel. The 23MnNiMoCr54 is used for producing high-hardness chains by the Parson chain division company (hereinafter referred to as Parson) of the coal mining machinery Limited liability company of the middlings kingdom, before 2011. Since 2011, Shijiazhuang Steel Limited liability company (hereinafter referred to as "Stone Steel") and Parssen developed 17CrNiMo6 and 15CrNi6 steels as steels for carburizing slag chain. Over the years of use, 17CrNiMo6 and 15CrNi6 have exposed the following problems during production and actual use: the surface hardness of the chain after carburization sometimes does not reach the requirement of more than or equal to 800HV, the core hardness is higher (more than or equal to 400 HV), and particularly for the chain with the diameter of more than or equal to 30mm, the core hardness is higher, so that the chain has poor plastic toughness and low breaking strength.
Disclosure of Invention
In order to solve the technical problems, the invention provides carburized super wear-resistant slag tapping machine chain steel which is good in welding performance, and the carburized chain processed by the chain steel has excellent surface hardness, core hardness, effective hardening layer depth of more than or equal to 550HV, breaking load and breaking elongation.
The technical scheme adopted by the invention is as follows:
a carburized super wear-resistant slag discharging machine chain steel comprises the following chemical components in percentage by mass: c: 0.09-0.13%, Si: 0.15 to 0.35%, Mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 1.40-1.70%, Ni: 1.40-1.70%, Mo: 0.25 to 0.35%, Cu: 0.08-0.12%, Al: 0.020-0.050%, and the balance of iron and inevitable impurities.
The chain steel is delivered in an annealed state.
The chain steel structure is a sorbite with carbide particles dispersed on a ferrite matrix.
The annealing hardness of the chain steel is 180-230 HBW, and the 180-degree cold bending test is qualified.
After the chain steel sample blank with the diameter of 15mm is quenched at 870 ℃ and tempered at 200 ℃, the mechanical property of the chain steel sample blank meets the requirements of tensile strength Rm: 1021-1117 MPa, yield strength ReL: 763-864 MPa, elongation after fracture A: 12-16.5%, reduction of area Z: 64-71%, normal-temperature impact energy KV 2: 137 to 214J.
The chain steel has the following functions of alloy elements in the components:
c: the carbon content in the steel increases and the yield strength and tensile strength increase, but the plasticity, toughness and welding performance of the steel are not influenced. In order to ensure the plasticity, toughness and weldability of the chain steel, the carbon content is not high. The carbon content of the invention is controlled to be 0.09-0.13%.
Si: silicon can increase the strength of solid solutions in steel and the degree of cold work hardening, which reduces the toughness and plasticity of steel, and an increase in the amount of silicon can reduce the weldability of steel. The Si content of the invention is controlled to be 0.15-0.35%.
Mn: is an element for improving the hardenability of steel, and the manganese has obvious effect on improving the strength of low-carbon steel and medium-carbon steel. However, when the Mn content is too high, the carbon equivalent is increased to deteriorate the weldability, and the Mn content is controlled to 0.40 to 0.60% in the present invention.
Cr: chromium can significantly improve strength, hardness and wear resistance, but simultaneously reduces plasticity and toughness; chromium also improves the oxidation resistance and corrosion resistance of the steel. The invention controls the Cr content to be 1.40-1.70%.
Ni: nickel improves the strength of the steel while maintaining good ductility and toughness. The nickel has higher corrosion resistance to acid and alkali and has antirust and heat-resisting capabilities at high temperature. The content of the organic silicon compound is controlled to be 1.40-1.70%.
Mo: molybdenum can refine the crystal grains of the steel, improve hardenability and heat strength, and maintain sufficient strength and creep resistance at high temperature. The addition of molybdenum to the structural steel can improve the mechanical properties. Mo can also suppress brittleness of the alloy steel due to quenching. However, the addition of too much will significantly increase the carbon equivalent of the material and thus adversely affect the flash welding performance of the chain steel. In addition, Mo is also a precious metal, and too high content increases cost. The content of Mo in the invention is controlled to be 0.25-0.35%.
Cu: copper improves strength and toughness, especially atmospheric corrosion performance. However, the excessively high Cu content is not favorable for the welding performance of the steel, and the copper brittleness phenomenon is easily generated to deteriorate the surface performance of the steel, and the Cu content is controlled to be 0.08-0.12%.
P: in general, P is a harmful element in steel, increases the cold brittleness of the steel, deteriorates the welding performance, reduces the plasticity, and deteriorates the cold bending performance, and the content of P is controlled to be less than or equal to 0.015 percent.
S: sulfur is also a harmful element in general. Hot shortness of the steel is generated, ductility and toughness of the steel are reduced, and cracks are generated during forging and rolling. The sulfur is also unfavorable for welding performance, the corrosion resistance is reduced, and the S content is controlled to be less than or equal to 0.015 percent.
Al: aluminum is a commonly used deoxidizer in steel. A small amount of aluminum is added into the steel, so that crystal grains can be refined, and the impact toughness is improved. The content of the invention is controlled to be 0.020-0.050%.
The invention reduces the carbon content, finely adjusts the contents of Si and Cr, puts forward the restriction requirements on the contents of Al, Cu, P and S, improves the welding performance of the chain ring through reasonable component design, reduces the core hardness, and improves the surface hardness, the breaking strength and the plastic toughness. The chain steel has excellent welding performance and stable quality index and is approved by users.
Detailed Description
The present invention will be described in further detail with reference to specific examples.
The chain steel of the carburizing super wear-resistant slag discharging machine comprises the following chemical components in percentage by mass: c: 0.09-0.13%, Si: 0.15 to 0.35%, Mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 1.40-1.70%, Ni: 1.40-1.70%, Mo: 0.25 to 0.35%, Cu: 0.08-0.12%, Al: 0.020-0.050%, and the balance of iron and inevitable impurities.
The chain steel is produced by the following method: comprises the working procedures of converter/electric furnace smelting, LF refining, vacuum degassing, continuous casting, continuous rolling and annealing. The rolling compression ratio of the continuous rolling process is more than or equal to 19.8, the initial rolling temperature is 1000-1060 ℃, and the rolled steel is cooled in a heaped mode. And the annealing process is carried out in a continuous annealing furnace, the steel stays for more than 4.8 hours in a high-temperature transition region of the continuous annealing furnace at 650-680 ℃, then is slowly cooled at a cooling speed of less than or equal to 30 ℃/h, the tapping temperature of the steel is less than or equal to 550 ℃, then is naturally cooled, and is bundled and put into storage after being straightened.
The metallographic structure of the chain steel obtained by the component design and production method is a sorbite with carbide particles dispersed on a ferrite matrix, the annealing hardness is 180-230 HBW, and the 180-degree cold bending test is qualified.
After the chain steel sample blank with the diameter of 15mm is quenched at 870 ℃ and tempered at 200 ℃, the mechanical property of the chain steel sample blank meets the requirements of tensile strength Rm: 1021-1117 MPa, yield strength ReL: 763-864 MPa, elongation after fracture A: 12-16.5%, reduction of area Z: 64-71%, normal-temperature impact energy KV 2: 137 to 214J.
The chemical components and the mass percentage of the chain steel in the examples 1 to 11 are shown in a table 1, the control of the main process parameters in the production process is shown in a table 2, and the mechanical properties are shown in a table 3.
The chain steels obtained in examples 1 to 11 were processed into a shape of a slag chain part and subjected to a carburizing heat treatment process, and the mechanical properties of the obtained carburized slag chain are shown in table 4.
TABLE 1 chemical composition and mass% of chain steel for each example
Figure DEST_PATH_IMAGE001
Table 2 Main technological parameters of the chain steel production process of each embodiment
Figure 970913DEST_PATH_IMAGE002
TABLE 3 mechanical properties of chain steels of the examples
Figure DEST_PATH_IMAGE003
TABLE 4 mechanical properties of carburized slag chain in examples
Figure 576469DEST_PATH_IMAGE004
In order to embody the technical effects of the invention, the steel grade of the invention is compared with the 17CrNiMo6 steel in terms of performance,
the chemical compositions of the two are compared and shown in Table 5. The two steels were processed into slag chain parts of the same specification and treated in the same furnace under the carburizing heat treatment process, and the comparison of the mechanical properties of the obtained carburizing slag chain is shown in table 6.
TABLE 5 chemical compositions and mass percent (%)
Figure DEST_PATH_IMAGE005
TABLE 6 comparison of mechanical properties of carburized slag-out chain of steel of the invention and 17CrNiMo6 steel
Figure 293889DEST_PATH_IMAGE006
As can be seen from Table 6, the performance index of the carburized chain of the steel grade of the invention is obviously improved compared with that of 17CrNiMo6 steel by the same furnace treatment under the carburizing heat treatment process, and the welding performance of the steel grade of the invention is better.

Claims (5)

1. The chain steel for the carburizing super wear-resistant slag discharging machine is characterized by comprising the following chemical components in percentage by mass: c: 0.09-0.13%, Si: 0.15 to 0.35%, Mn: 0.40-0.60%, P is less than or equal to 0.015%, S is less than or equal to 0.015%, Cr: 1.40-1.70%, Ni: 1.40-1.70%, Mo: 0.25 to 0.35%, Cu: 0.08-0.12%, Al: 0.020-0.050%, and the balance of iron and inevitable impurities.
2. The carburized super wear resistant mucking machine chain steel of claim 1, wherein said chain steel is delivered in an annealed state.
3. The carburized super wear resistant mucking machine chain steel of claim 2, wherein said chain steel structure is a sorbite having dispersed carbide particles on a ferritic matrix.
4. The carburized super wear-resistant slag tapping machine chain steel according to any one of claims 1 to 3, wherein the annealed hardness of the chain steel is 180-230 HBW, and the 180 DEG cold bending test is qualified.
5. The carburized super wear-resistant slag tapping machine chain steel according to claim 4, wherein mechanical properties of a sample blank of the chain steel with a diameter of 15mm after quenching at 870 ℃ and tempering at 200 ℃ meet tensile strength Rm: 1021-1117 MPa, yield strength ReL: 763-864 MPa, elongation after fracture A: 12-16.5%, reduction of area Z: 64-71%, normal-temperature impact energy KV 2: 137 to 214J.
CN202110686054.8A 2021-06-21 2021-06-21 Carburization super wear-resistant slag extractor chain steel Active CN113549814B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110686054.8A CN113549814B (en) 2021-06-21 2021-06-21 Carburization super wear-resistant slag extractor chain steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110686054.8A CN113549814B (en) 2021-06-21 2021-06-21 Carburization super wear-resistant slag extractor chain steel

Publications (2)

Publication Number Publication Date
CN113549814A true CN113549814A (en) 2021-10-26
CN113549814B CN113549814B (en) 2022-11-22

Family

ID=78130754

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110686054.8A Active CN113549814B (en) 2021-06-21 2021-06-21 Carburization super wear-resistant slag extractor chain steel

Country Status (1)

Country Link
CN (1) CN113549814B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103667953A (en) * 2013-11-28 2014-03-26 江苏亚星锚链股份有限公司 Oceanic mooring chain steel with low environmental crack sensitivity and ultrahigh obdurability and preparation method thereof
CN104532143A (en) * 2014-12-22 2015-04-22 江阴兴澄特种钢铁有限公司 Mining large-specification and high-strength chain steel and preparation method thereof
US20190185952A1 (en) * 2016-08-24 2019-06-20 Wuhan Iron And Steel Company Limited 1500 MPa GRADE PRESS HARDENING STEEL BY THIN SLAB CASTING AND DIRECT ROLLING AND METHOD FOR PRODUCING THE SAME

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103667953A (en) * 2013-11-28 2014-03-26 江苏亚星锚链股份有限公司 Oceanic mooring chain steel with low environmental crack sensitivity and ultrahigh obdurability and preparation method thereof
CN104532143A (en) * 2014-12-22 2015-04-22 江阴兴澄特种钢铁有限公司 Mining large-specification and high-strength chain steel and preparation method thereof
US20190185952A1 (en) * 2016-08-24 2019-06-20 Wuhan Iron And Steel Company Limited 1500 MPa GRADE PRESS HARDENING STEEL BY THIN SLAB CASTING AND DIRECT ROLLING AND METHOD FOR PRODUCING THE SAME

Also Published As

Publication number Publication date
CN113549814B (en) 2022-11-22

Similar Documents

Publication Publication Date Title
CN109161658B (en) Steel for main shaft bearing of wind driven generator and production method thereof
CN110983178B (en) Steel for ball screw bearing and manufacturing method thereof
CN107904492B (en) Low-silicon high-carbon chromium bearing steel and hot rolling production method thereof
CN109023119B (en) Wear-resistant steel with excellent ductility and toughness and manufacturing method thereof
CN114134411B (en) Spheroidized annealed steel for low-temperature-resistant high-strength ball screw and manufacturing method thereof
CN109763078B (en) Heat-resistant alloy carburizing steel and preparation method thereof
CN108998725A (en) Track link rail 35MnBM steel and preparation method thereof
CN107587079A (en) Nitrogenous microalloying spring steel and preparation method thereof
CN113249643B (en) Mining high-strength carburized chain steel and preparation method thereof
CN114411043B (en) Preparation method of large hot forging hot work die steel
US11959158B2 (en) Hot-work die steel with high toughness at low temperatures and high strength at high temperatures and high hardenability and preparation method thereof
CN112048668B (en) High-hardness steel for shield cutter and manufacturing method thereof
CN105779867A (en) Free-cutting wear-resisting steel plate and manufacturing method thereof
CN105154786A (en) Wear-resistant vanadium-titanium gear and preparation method thereof
CN114807773A (en) High-mechanical-property steel for wind driven generator shaft and preparation process thereof
CN114134397B (en) Steel suitable for cold extrusion of ball screw and production method thereof
CN114182179A (en) High-strength bucket tooth steel for engineering machinery and production method and heat treatment process thereof
CN106893941A (en) A kind of low-alloy wear-resistant steel and its heat treatment method
CN109930063A (en) A kind of engineering machinery crawler body wheel body steel and its production method
CN113637899A (en) Seamless steel tube containing rare earth for 950 MPa-level engineering machinery and production method thereof
CN109295392B (en) Production method of high-surface-quality ultrahigh-strength steel
CN115537655B (en) High-silicon wear-resistant steel plate and production method thereof
JP2015129335A (en) Steel for carburized shaft bearing
CN114990425B (en) Cutter for scrap steel crushing and preparation and repair methods thereof
CN113549814B (en) Carburization super wear-resistant slag extractor chain steel

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant