WO2024143075A1 - 熱間鍛造用非調質鋼並びに熱間鍛造材及びその製造方法 - Google Patents

熱間鍛造用非調質鋼並びに熱間鍛造材及びその製造方法 Download PDF

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Publication number
WO2024143075A1
WO2024143075A1 PCT/JP2023/045559 JP2023045559W WO2024143075A1 WO 2024143075 A1 WO2024143075 A1 WO 2024143075A1 JP 2023045559 W JP2023045559 W JP 2023045559W WO 2024143075 A1 WO2024143075 A1 WO 2024143075A1
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WO
WIPO (PCT)
Prior art keywords
less
hot forging
hot
content
ferrite
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.)
Ceased
Application number
PCT/JP2023/045559
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English (en)
French (fr)
Japanese (ja)
Inventor
克行 一宮
和明 福岡
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.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
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 JFE Steel Corp filed Critical JFE Steel Corp
Priority to CN202380088113.9A priority Critical patent/CN120418465A/zh
Priority to EP23911855.7A priority patent/EP4596742A4/en
Priority to JP2024523833A priority patent/JP7552959B1/ja
Priority to KR1020257019351A priority patent/KR20250108687A/ko
Publication of WO2024143075A1 publication Critical patent/WO2024143075A1/ja
Priority to MX2025007520A priority patent/MX2025007520A/es
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/38—Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
    • 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
    • C21D1/84—Controlled slow cooling
    • 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
    • C21D7/00—Modifying the physical properties of iron or steel by deformation
    • C21D7/13—Modifying the physical properties of iron or steel by deformation by hot working
    • 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 of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment
    • C21D8/06—Modifying the physical properties of ferrous metals or ferrous alloys by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
    • 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
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
    • 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
    • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • C22C38/008—Ferrous alloys, e.g. steel alloys containing tin
    • 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
    • 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
    • C22C38/20—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium 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
    • C22C38/24—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
    • C22C38/26—Ferrous alloys, e.g. steel alloys containing chromium with niobium or tantalum
    • 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
    • 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
    • C22C38/32—Ferrous alloys, e.g. steel alloys containing chromium with boron
    • 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
    • C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel 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
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/54—Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
    • 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
    • C22C38/58—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
    • 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

Definitions

  • Patent Document 1 proposes a so-called bainite unaltered steel in which the carbon content is extremely reduced to make the structure a single phase of bainite, thereby improving both strength and toughness.
  • the bainite structure has the problem that yielding occurs at low strain and fatigue properties are poor.
  • Patent Document 2 describes how high-yield-strength non-tempered steel, suitable for parts such as connecting rods, can be manufactured without impairing machinability even when large amounts of P and S are added to increase the yield strength ratio, which is the ratio of 0.2% yield strength to tensile strength.
  • yield strength ratio which is the ratio of 0.2% yield strength to tensile strength.
  • bainitic non-tempered steel tensile strength is improved while toughness is also ensured.
  • permanent deformation begins in the low load region in tensile tests, so the yield strength in strain ranges smaller than 0.2% is lower than that of ferrite-pearlite non-tempered steel, which has lower tensile strength.
  • deformation is likely to occur when repeated stresses such as bending are applied in the low strain range. Therefore, bainitic non-tempered steel cannot be used to manufacture parts that require durability in this case.
  • the component composition is, in mass%, The non-heat treated steel for hot forging according to the above [1] or [2], further containing Sn: 0.030% or less.
  • Ni 0.03% or less Ni causes the surface of the steel to be unevenly oxidized by heating before hot forging, causing surface defects called roughness. Therefore, the Ni content is limited to 0.03% or less, and preferably 0.02% or less. The lower limit of the Ni content is not particularly limited, and the N content can be 0.00% or more.
  • the symbol of an element indicates the content (mass %) of the element.
  • Ceq is an index that correlates with the hardenability of steel. In order to obtain a predetermined strength, Ceq is set to 0.62 or more, and preferably 0.63 or more. On the other hand, if Ceq exceeds 0.72, bainite structure is generated, and toughness and fatigue strength are reduced. For this reason, Ceq is set to 0.72 or less, and preferably 0.71 or less.
  • the symbol of an element indicates the content (mass %) of the element.
  • ⁇ is an index that correlates with the yield strength at a strain of 0.05%, and if ⁇ is less than 4.4, the yield strength in the low strain range decreases, resulting in low fatigue strength. For this reason, ⁇ is set to 4.4 or more.
  • ⁇ exceeds 6.2, bainite structure is likely to be generated, which similarly reduces the yield strength and causes early deformation due to repeated stress. Therefore, ⁇ is set to 6.2 or less.
  • the composition may contain one or more elements selected from the group consisting of Cu, Mo, Nb, Ti, Sb, Pb, Ca, Mg, Bi, and Sn. Note that since these elements are optional, there is no particular lower limit for the content of each element. In other words, the content of each element may be 0% or may exceed 0%.
  • Ti 0.025% or less Ti has the effect of making the structure finer and improving the impact properties. To obtain this effect, the Ti content is preferably 0.001% or more. On the other hand, if the Ti content exceeds 0.025%, the toughness decreases and the impact properties deteriorate, so when Ti is added, the Ti content is set to 0.025% or less.
  • Pb 0.30% or less
  • Pb has the effect of improving machinability.
  • the Pb content is preferably 0.01% or more, and more preferably 0.05% or more.
  • the Pb content exceeds 0.30%, the toughness decreases and the impact properties deteriorate, so when Pb is added, the Pb content is set to 0.30% or less.
  • Ca 0.0050% or less
  • the Ca content is preferably 0.0001% or more, and more preferably 0.0005% or more.
  • the Ca content is set to 0.0050% or less.
  • Mg 0.0050% or less Mg has the effect of improving machinability.
  • the Mg content is preferably 0.0001% or more, and more preferably 0.0005% or more.
  • the Mg content exceeds 0.0050%, the toughness decreases and the impact properties deteriorate, so when Mg is added, the Mg content is set to 0.0050% or less.
  • the non-heat treated steel for hot forging and the hot forged material of the present invention are suitably used as materials for machine structural parts used in automobiles, construction machinery, and industrial machinery.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Heat Treatment Of Steel (AREA)
  • Forging (AREA)
PCT/JP2023/045559 2022-12-26 2023-12-19 熱間鍛造用非調質鋼並びに熱間鍛造材及びその製造方法 Ceased WO2024143075A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN202380088113.9A CN120418465A (zh) 2022-12-26 2023-12-19 热锻用非调质钢和热锻材及其制造方法
EP23911855.7A EP4596742A4 (en) 2022-12-26 2023-12-19 UNHARDENED STEEL FOR HOT FORGING PURPOSES, AND HOT FORGING MATERIAL AND ITS PRODUCTION PROCESS
JP2024523833A JP7552959B1 (ja) 2022-12-26 2023-12-19 熱間鍛造用非調質鋼並びに熱間鍛造材及びその製造方法
KR1020257019351A KR20250108687A (ko) 2022-12-26 2023-12-19 열간 단조용 비조질강 그리고 열간 단조재 및 그의 제조 방법
MX2025007520A MX2025007520A (es) 2022-12-26 2025-06-25 Acero no tratado termicamente para forja en caliente, y material forjado en caliente y metodo de produccion del mismo

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2022-209056 2022-12-26
JP2022209056 2022-12-26

Publications (1)

Publication Number Publication Date
WO2024143075A1 true WO2024143075A1 (ja) 2024-07-04

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PCT/JP2023/045559 Ceased WO2024143075A1 (ja) 2022-12-26 2023-12-19 熱間鍛造用非調質鋼並びに熱間鍛造材及びその製造方法

Country Status (6)

Country Link
EP (1) EP4596742A4 (https=)
JP (1) JP7552959B1 (https=)
KR (1) KR20250108687A (https=)
CN (1) CN120418465A (https=)
MX (1) MX2025007520A (https=)
WO (1) WO2024143075A1 (https=)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010242170A (ja) * 2009-04-06 2010-10-28 Nippon Steel Corp 靭性に優れた高強度熱間鍛造非調質鋼及びその製造方法
JP2010265506A (ja) * 2009-05-14 2010-11-25 Sanyo Special Steel Co Ltd 疲労強度と切削加工性に優れたフェライト−パーライト型熱間鍛造用非調質鋼および該非調質鋼からなるコモンレールシステムに使用されるレール部品
JP2010270346A (ja) * 2009-05-19 2010-12-02 Jfe Bars & Shapes Corp 曲げ疲労強度が高く、繰り返し応力による変形量の小さい熱間鍛造用非調質鋼およびその部品の製造方法
JP2016222985A (ja) * 2015-06-01 2016-12-28 新日鐵住金株式会社 高周波焼入れ用非調質鋼
JP2018035417A (ja) * 2016-09-01 2018-03-08 新日鐵住金株式会社 熱間鍛造用鋼及び熱間鍛造品

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000265245A (ja) 1999-03-15 2000-09-26 Sumitomo Metal Ind Ltd 高強度高靭性非調質鋼材
JP4784103B2 (ja) 2005-01-25 2011-10-05 大同特殊鋼株式会社 高耐力比非調質鋼
JP2006299319A (ja) * 2005-04-19 2006-11-02 Sumitomo Metal Ind Ltd 機械構造用鋼
JP5737152B2 (ja) 2011-11-21 2015-06-17 新日鐵住金株式会社 熱間鍛造用圧延棒鋼
CN113646448B (zh) * 2019-04-10 2023-08-11 日本制铁株式会社 钢轴部件

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010242170A (ja) * 2009-04-06 2010-10-28 Nippon Steel Corp 靭性に優れた高強度熱間鍛造非調質鋼及びその製造方法
JP2010265506A (ja) * 2009-05-14 2010-11-25 Sanyo Special Steel Co Ltd 疲労強度と切削加工性に優れたフェライト−パーライト型熱間鍛造用非調質鋼および該非調質鋼からなるコモンレールシステムに使用されるレール部品
JP2010270346A (ja) * 2009-05-19 2010-12-02 Jfe Bars & Shapes Corp 曲げ疲労強度が高く、繰り返し応力による変形量の小さい熱間鍛造用非調質鋼およびその部品の製造方法
JP2016222985A (ja) * 2015-06-01 2016-12-28 新日鐵住金株式会社 高周波焼入れ用非調質鋼
JP2018035417A (ja) * 2016-09-01 2018-03-08 新日鐵住金株式会社 熱間鍛造用鋼及び熱間鍛造品

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP4596742A4 *

Also Published As

Publication number Publication date
EP4596742A4 (en) 2026-01-21
MX2025007520A (es) 2025-08-01
EP4596742A1 (en) 2025-08-06
CN120418465A (zh) 2025-08-01
JP7552959B1 (ja) 2024-09-18
JPWO2024143075A1 (https=) 2024-07-04
KR20250108687A (ko) 2025-07-15

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