CN109402512A - The heat treatment method of 25Cr3NiMoW material forging intensity can be improved - Google Patents

The heat treatment method of 25Cr3NiMoW material forging intensity can be improved Download PDF

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Publication number
CN109402512A
CN109402512A CN201811434094.8A CN201811434094A CN109402512A CN 109402512 A CN109402512 A CN 109402512A CN 201811434094 A CN201811434094 A CN 201811434094A CN 109402512 A CN109402512 A CN 109402512A
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25cr3nimow
material forging
heat treatment
heat
forging
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CN109402512B (en
Inventor
黄永强
汤晶晶
张承峰
熊武
刘国平
周预平
罗波
马晓兵
邹泉
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Wuhan Heavy Industry Casting and Forging Co Ltd
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Wuhan Heavy Industry Casting and Forging 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
    • 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
    • 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
    • C22C38/18—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
    • 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
    • C22C38/48—Ferrous alloys, e.g. steel alloys containing chromium with nickel with niobium or tantalum

Abstract

The present invention relates to a kind of heat treatment methods that can improve 25Cr3NiMoW material forging intensity, using annealing, quenching, the heat treatment mode of lonneal.Annealing, is first to heat to 650~670 DEG C of insulation annealings, stove air is cold out；Quenching, is first to heat to 610~650 DEG C of heat preservations, then keep the temperature after being warming up to 900~920 DEG C of sammings, furnace oil is cold out；Lonneal, after being heated to 200~220 DEG C of heat preservations, stove air is cold out.The present invention can be heat-treated the 25Cr3NiMoW material forging that effective cross-section is φ 100mm~φ 800mm.The 25Cr3NiMoW material forging being heat-treated through the present invention can reach Rm >=1650MPa, the superhigh intensity of Rp0.2 >=1260MPa, AKThe high tenacity of U2 >=55J can meet the technical requirements of high-tech product forging, production process strong operability comprehensively.

Description

The heat treatment method of 25Cr3NiMoW material forging intensity can be improved
Technical field
The present invention relates to a kind of high alloy-structural steel forging production technical fields, relate generally to a kind of energy raising The heat treatment method of 25Cr3NiMoW material forging intensity.
Background technique
The material of domestic common high alloy-structural steel forging includes 25Cr3NiMoW, 25Cr2Ni4MoV, 18Cr2Ni4W Deng, but Rp >=835MPa that the intensity rank of this kind of high alloy-structural steel forging only up to reach, Rm >=1180MPa.It is high The heat treatment method of alloy structure steel forgings is specifically to be heated to 880~900 DEG C using the method for quenching+high tempering and quenched Fire, soaking time are calculated by 0.9h/100mm.Tempering: keeping the temperature after being heated to 550~660 DEG C of sammings, and soaking time presses 2..5h/ 100mm calculate, output trolley come out of the stove it is air-cooled.After tested, this kind of high alloy-structural steel forging needs to reach the above intensity rank institute It is required that material forging, can be only achieved after need to also comprehensively considering in terms of chemical component, and be heat-treated section and be greater than The material forging of φ 500mm is different surely to be reached.
As the project that high-tech is invented is more and more extensive, high-tech product is also more and more, is especially in many fields The technical requirements (Rp0.2 >=1260MPa, Rm >=1650MPa, A that reach superhigh intensity are needed under specific environmentKU2 >=55J) come Meet specific environmental demand, this just needs that unconventional heat treatment mode is taken to meet the needs of market.
Summary of the invention
The purpose of the present invention is be directed to above-mentioned status, it is desirable to provide a kind of that 25Cr3NiMoW material forging can be made to have superelevation The heat treatment method of intensity and high impact toughness.
The object of the invention implementation is that can improve the heat treatment method of 25Cr3NiMoW material forging intensity, The chemical component % of 25Cr3NiMoW material forging, wt, heat analysis are as follows: C:0.25%~0.27%, Si:1.15%~ 1.5%, Mn:0.50%~0.80%, P:0.008%~0.010%, S:0.004%~0.005%, Cr:3.15%~ 3.50%, Ni:0.70%~1.10%, Mo:0.32%~0.58%, W:0.35%~0.55%, Nb:0.02%~ 0.05%, remaining element is met the requirements；
Specific step is as follows for heat treatment:
1) 25Cr3NiMoW material forging is first heated to 650~670 DEG C, is kept the temperature after samming, soaking time is pressed 1.0h/100mm calculating, air is cold after coming out of the stove；
The 100mm refers to the effective cross-section of material forging heat treatment；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 610~650 DEG C, heat preservation 2 is small When, then kept the temperature after being warming up to 900~920 DEG C of sammings, soaking time is calculated by 1.0h/100mm；It comes out of the stove quenching；
The 100mm refers to the effective cross-section of material forging heat treatment；
The quenching mode is that oil is cold, and oily cool time is calculated by 13s/mm；
The mm refers to the effective cross-section unit of material forging heat treatment；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 200~220 DEG C of sammings； Soaking time is calculated by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging；
The 100mm refers to the effective cross-section of material forging heat treatment.
Heat treatment method of the invention is first to anneal, and annealing can discharge stress, refines crystal grain, improves tissue, is done for quenching Good tissue prepares；It quenching again, phase change transition temperature AC3 is calculated according to chemical component in hardening heat, and 836 DEG C of AC3 ≈, forging Hardening heat range determine at 900~920 DEG C, after keeping the temperature at such a temperature, using the cold quenching mode of coming out of the stove of oil, can improve The intensity of 25Cr3NiMoW material forging；Lonneal immediately after quenching obtains high-intensitive and high tenacity material forging.
The present invention efficiently solves high-tech product to the technology of the materials demand of superhigh intensity and high tenacity comprehensive performance Problem.
The present invention can be heat-treated the material forging that effective cross-section is φ 100mm~φ 800mm.It is heat-treated through the present invention 25Cr3NiMoW material forging can reach Rm >=1650MPa, the superhigh intensity of Rp0.2 >=1260MPa, AKThe high-ductility of U2 >=55J Property, the technical requirements of high-tech product forging, production process strong operability can be met comprehensively.
Specific embodiment
The chemical component % of 25Cr3NiMoW material forging used in the present invention, wt, heat analysis are as follows: C:0.25%~ 0.27%, Si:1.15%~1.5%, Mn:0.50%~0.80%, P:0.008%~0.010%, S:0.004%~ 0.005%, Cr:3.15%~3.50%, Ni:0.70%~1.10%, Mo:0.32%~0.58%, W:0.35%~ 0.55%, Nb:0.02%~0.05%, remaining element are met the requirements.
Forging heat treatment of the invention uses annealing+quenching+lonneal heat treatment mode.Annealing, is first to heat to 650 ~670 DEG C of insulation annealings, stove air is cold out；Quenching, is first to heat to 610~650 DEG C of heat preservations, then be warming up to 900~920 DEG C of sammings After keep the temperature, furnace oil is cold out；Lonneal, after being heated to 200~220 DEG C of heat preservations, stove air is cold out.
For the applicant to after present invention heat treatment, effective cross-section is the 25Cr3NiMoW material of φ 100mm~φ 800mm Material forging made Mechanics Performance Testing, the sample position of mechanical property are as follows: sample center line away from surface 1/3R locate, sample direction be Laterally.Mechanical experimental results can reach: Rp0.2 >=1260MPa, Rm >=1700MPa, A >=8%, Z >=40%, AKU2≥ 55J。
The present invention is described in detail with specific embodiment below.
Embodiment 1:
Being heat-treated 25Cr3NiMoW material forging heat treatment effective cross-section is φ 100mm, chemical component (%, wt, melting Analysis) as follows: C:0.25%, Si:1.15%, Mn:0.50%, P:0.008%, S:0.005%, Cr:3.3%, Ni:0.7%, Mo:0.35%, W:0.35%, Nb:0.02%, remaining element are met the requirements.
Specific step is as follows for heat treatment:
1) 25Cr3NiMoW material forging is first heated to 650 DEG C, is kept the temperature after samming, soaking time presses 1.0h/ 100mm is calculated as 1h, and air is cold after coming out of the stove；
The 100mm refers to the effective cross-section of material forging heat treatment；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 610 DEG C, keeps the temperature 2 hours, then It is kept the temperature after being warming up to 900 DEG C of sammings, soaking time is calculated as 1h by 1.0h/100mm；It comes out of the stove quenching；
The 100mm refers to the effective cross-section of material forging heat treatment；
The quenching mode is that oil is cold, and oily cool time is calculated about 22 minutes by 13s/mm；
The mm refers to the effective cross-section unit of material forging heat treatment；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 200 DEG C of sammings；Heat preservation Time is calculated as 2.5h by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging.
The mechanical performance of the 25Cr3NiMoW material forging of the present embodiment heat treatment: Rp0.2:1350MPa；Rm: 1801MPa；A:13%；Z:51%；Three impact average value AKU2:64J.
Embodiment 2: with embodiment 1, the difference is that,
Being heat-treated 25Cr3NiMoW material forging heat treatment effective cross-section is φ 300mm, chemical component (%, wt, melting Analysis) as follows: C:0.26%, Si:1.4%, Mn:0.60%, P:0.010%, S:0.004%, Cr:3.15%, Ni:1.0%, Mo:0.32%, W:0.45%, Nb:0.02%, remaining element are met the requirements.
Specific step is as follows for heat treatment:
1) 25Cr3NiMoW material forging is first heated to 650 DEG C, is kept the temperature after samming, soaking time presses 1.0h/ 100mm is calculated as 3h, and air is cold after coming out of the stove；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 610 DEG C, keeps the temperature 2 hours, then It is kept the temperature after being warming up to 910 DEG C of sammings, soaking time is calculated as 3h by 1.0h/100mm；It comes out of the stove quenching；
The quenching mode is that oil is cold, and oily cool time is calculated as 65 minutes by 13s/mm；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 210 DEG C of sammings；Heat preservation Time calculates 7.5h by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging.
The mechanical performance of the 25Cr3NiMoW material forging of the present embodiment heat treatment: Rp0.2:1310MPa；Rm: 1770MPa；A:11%；Z:47%；Three impact average value AKU2:60J.
Embodiment 3: with embodiment 1, the difference is that,
Being heat-treated 25Cr3NiMoW material forging heat treatment effective cross-section is φ 500mm, chemical component (%, wt, melting Analysis) as follows: C:0.27%, Si:1.45%, Mn:0.70%, P:0.008%, S:0.005%, Cr:3.4%, Ni:1.0%, Mo:0.55%, W:0.50%, Nb:0.03%, remaining element are met the requirements.
Specific step is as follows for heat treatment:
The quenching mode is that oil is cold；Oily cool time is calculated about 108 minutes by 13s/mm.
1) 25Cr3NiMoW material forging is first heated to 660 DEG C, is kept the temperature after samming, soaking time presses 1.0h/ 100mm is calculated as 5h, and air is cold after coming out of the stove；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 630 DEG C, keeps the temperature 2 hours, then It is kept the temperature after being warming up to 920 DEG C of sammings, soaking time is calculated as 5h by 1.0h/100mm；It comes out of the stove quenching；
The quenching mode is that oil is cold, and oily cool time is calculated about 108 minutes by 13s/mm；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 220 DEG C of sammings；Heat preservation Time calculates 12.5h by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging.
The mechanical performance of the 25Cr3NiMoW material forging of the present embodiment heat treatment: Rp0.2:1290MPa；Rm: 1755MPa；A:9%；Z:44%；Three impact average value AKU2:59J.
Embodiment 4: with embodiment 1, the difference is that,
Being heat-treated 25Cr3NiMoW material forging heat treatment effective cross-section is φ 700mm, chemical component (%, wt, melting Analysis) as follows: C:0.27%, Si:1.45%, Mn:0.80%, P:0.009%, S:0.005%, Cr:3.3%, Ni:1.1%, Mo:0.58%, W:0.55%, Nb:0.04%, remaining element are met the requirements.
Specific step is as follows for heat treatment:
1) 25Cr3NiMoW material forging is first heated to 670 DEG C, is kept the temperature after samming, soaking time presses 1.0h/ 100mm is calculated as 7h, and air is cold after coming out of the stove；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 650 DEG C, keeps the temperature 2 hours, then It is kept the temperature after being warming up to 920 DEG C of sammings, soaking time is calculated as 7h by 1.0h/100mm；It comes out of the stove quenching；
The quenching mode is that oil is cold, and oily cool time is calculated about 152 minutes by 13s/mm；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 220 DEG C of sammings；Heat preservation Time calculates 20h by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging.
The mechanical performance of the 25Cr3NiMoW material forging of the present embodiment heat treatment:
Rp0.2:1285MPa；Rm:1736MPa；A:8%；Z:42%；Three impact average value AKU2:58J.
Embodiment 5: with embodiment 1, the difference is that,
Being heat-treated 25Cr3NiMoW material forging heat treatment effective cross-section is φ 800mm, chemical component (%, wt, melting Analysis) as follows: C:0.26%, Si:1.50%, Mn:0.80%, P:0.008%, S:0.005%, Cr:3.5%, Ni:1.1%, Mo:0.57%, W:0.54%, Nb:0.05%, remaining element are met the requirements.
Specific step is as follows for heat treatment:
1) 25Cr3NiMoW material forging is first heated to 670 DEG C, is kept the temperature after samming, soaking time presses 1.0h/ 100mm is calculated as 8h, and air is cold after coming out of the stove；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 650 DEG C, keeps the temperature 2 hours, then It is kept the temperature after being warming up to 920 DEG C of sammings, soaking time is calculated as 8h by 1.0h/100mm；It comes out of the stove quenching；
The quenching mode is that oil is cold, and oily cool time is calculated about 173 minutes by 13s/mm；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 220 DEG C of sammings；Heat preservation Time calculates 20h by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging.
The mechanical performance of the 25Cr3NiMoW material forging of the present embodiment heat treatment: Rp0.2:1260MPa；Rm: 1700MPa；A:8%；Z:40%；Three impact average value AKU2:55J.
The applicant is heat-treated the 25Cr3NiMoW material forging of embodiment 1-5 using conventional quenching+high tempering Technique heat treatment specially " is heated to 880~900 DEG C of quenchings, soaking time is calculated by 0.9h/100mm.Tempering: it is heated to Kept the temperature after 550~660 DEG C of sammings, soaking time by 2..5h/100mm calculate, output trolley come out of the stove it is air-cooled " comparative experiments 1- 5.That is comparative experiments 1-5 is not used " to be kept the temperature, soaking time is based on 1.0h/100mm after being heated to 650~670 DEG C of sammings Calculate, air is cold after coming out of the stove " step 1)；900~920 DEG C of hardening heat of step 2) are not used；Not using " low temperature returns Fire, be heated to 200~220 DEG C heat preservation after, stove air is cold out " step 3).
And Mechanics Performance Testing has been made to comparative example 1-5 by the same mechanic property test method with embodiment 1-5, it tests As a result as follows:
The 25Cr3NiMoW material forging horizontal mechanical performance value that comparative example 1 is heat-treated are as follows: Rp0.2:901MPa, Rm: 1315MPa, A:10%, Z:53%, three impact average value AKU2:61J.
The 25Cr3NiMoW material forging horizontal mechanical performance value that comparative example 2 is heat-treated are as follows: Rp0.2:875MPa, Rm: 1276MPa, A:8%, Z:51%, three impact average value AKU2:54J.
The 25Cr3NiMoW material forging horizontal mechanical performance value that comparative example 3 is heat-treated are as follows: Rp0.2:824MPa, Rm: 1154MPa, A:8%, Z:49%, three impact average value AKU2:47J.
The 25Cr3NiMoW material forging horizontal mechanical performance value that comparative example 4 is heat-treated are as follows: Rp0.2:810MPa, Rm: 1104MPa, A:7%, Z:40%, three impact average value AKU2:41J.
The 25Cr3NiMoW material forging horizontal mechanical performance value that comparative example 5 is heat-treated are as follows: Rp0.2:807MPa, Rm: 1095MPa, A:6%, Z:40%, three impact average value AKU2:40J.
From the result of embodiment 1-5 and the Comparative result of comparative example 1-5: impacting (AKU2) average value is little, but bends It takes intensity (Rp0.2) and tensile strength (Rm) to improve very much, absolutely proving can make using heat treatment method of the invention The tensile strength of 25Cr3NiMoW material forging reaches the technical requirements of superhigh intensity, meets the needs of specific environment.

Claims (2)

1. the heat treatment method of 25Cr3NiMoW material forging intensity can be improved, it is characterised in that: 25Cr3NiMoW material forging Chemical component %, wt, heat analysis is as follows: C:0.25%~0.27%, Si:1.15%~1.5%, Mn:0.50%~ 0.80%, P:0.008%~0.010%, S:0.004%~0.005%, Cr:3.15%~3.50%, Ni:0.70%~ 1.10%, Mo:0.32%~0.58%, W:0.35%~0.55%, Nb:0.02%~0.05%, remaining element are met the requirements；
Specific step is as follows for heat treatment:
1) 25Cr3NiMoW material forging is first heated to 650~670 DEG C, is kept the temperature after samming, soaking time presses 1.0h/ 100mm is calculated, and air is cold after coming out of the stove；
The 100mm refers to the effective cross-section of material forging heat treatment；
2) the 25Cr3NiMoW material forging being cooled to room temperature through step 1) is first to heat to 610~650 DEG C, keeps the temperature 2 hours, then It is kept the temperature after being warming up to 900~920 DEG C of sammings, soaking time is calculated by 1.0h/100mm；It comes out of the stove quenching；
The 100mm refers to the effective cross-section of material forging heat treatment；
The quenching mode is that oil is cold, and oily cool time is calculated by 13s/mm；
The mm refers to the effective cross-section unit of material forging heat treatment；
3) it will be kept the temperature after the quenched 25Cr3NiMoW material forging of step 2) is heated to 200~220 DEG C of sammings；Heat preservation Time is calculated by 2.5h/100mm, and stove air is cold out, obtains high-intensitive 25Cr3NiMoW material forging；
The 100mm refers to the effective cross-section of material forging heat treatment.
2. the heat treatment method according to claim 1 that 25Cr3NiMoW material forging intensity can be improved, it is characterised in that: Effective cross-section 100~φ of φ 800mm of 25Cr3NiMoW material forging heat treatment.
CN201811434094.8A 2018-11-28 2018-11-28 Heat treatment method capable of improving strength of 25Cr3NiMoW material forged piece Active CN109402512B (en)

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CN102560244A (en) * 2011-12-30 2012-07-11 中信重工机械股份有限公司 Microalloying and heat treatment method for 20MnMo steel
CN103436803A (en) * 2013-08-13 2013-12-11 武汉重工铸锻有限责任公司 Processing method for pump head body of five-cylinder plunger pump
US20150259771A1 (en) * 2013-11-15 2015-09-17 Gregory Vartanov High Strength Low Alloy Steel and Method of Manufacturing
JP2015188927A (en) * 2014-03-28 2015-11-02 大同特殊鋼株式会社 Production method of forged member

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