JP6853887B2 - 加工性および表面特性が優秀なオーステナイト系ステンレス鋼およびその製造方法 - Google Patents
加工性および表面特性が優秀なオーステナイト系ステンレス鋼およびその製造方法 Download PDFInfo
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- 229910000963 austenitic stainless steel Inorganic materials 0.000 title claims description 62
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- 238000005204 segregation Methods 0.000 claims description 75
- 238000003887 surface segregation Methods 0.000 claims description 23
- 238000001816 cooling Methods 0.000 claims description 17
- 238000000137 annealing Methods 0.000 claims description 11
- 238000005098 hot rolling Methods 0.000 claims description 11
- 229910001566 austenite Inorganic materials 0.000 claims description 9
- 238000009749 continuous casting Methods 0.000 claims description 8
- 229910052804 chromium Inorganic materials 0.000 claims description 7
- 239000012535 impurity Substances 0.000 claims description 7
- 229910052759 nickel Inorganic materials 0.000 claims description 7
- 238000005097 cold rolling Methods 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 230000002950 deficient Effects 0.000 claims description 5
- 229910052748 manganese Inorganic materials 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 238000012423 maintenance Methods 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims 2
- 229910052750 molybdenum Inorganic materials 0.000 claims 2
- 238000012545 processing Methods 0.000 description 27
- 238000005482 strain hardening Methods 0.000 description 17
- 229910000831 Steel Inorganic materials 0.000 description 11
- 239000010959 steel Substances 0.000 description 11
- 230000007547 defect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000007797 corrosion Effects 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 230000000087 stabilizing effect Effects 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 229910000734 martensite Inorganic materials 0.000 description 4
- 238000003892 spreading Methods 0.000 description 4
- 230000007480 spreading Effects 0.000 description 4
- 230000009466 transformation Effects 0.000 description 4
- 230000037303 wrinkles Effects 0.000 description 4
- 239000010960 cold rolled steel Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004453 electron probe microanalysis Methods 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 230000000171 quenching effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003303 reheating Methods 0.000 description 2
- 229910000589 SAE 304 stainless steel Inorganic materials 0.000 description 1
- 239000010953 base metal Substances 0.000 description 1
- 230000001684 chronic effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/002—Stainless steels
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- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
- B22D11/225—Controlling or regulating processes or operations for cooling cast stock or mould for secondary cooling
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- 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
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
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- C21D6/00—Heat treatment of ferrous alloys
- C21D6/008—Heat treatment of ferrous alloys containing Si
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0236—Cold rolling
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- 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
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
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- 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
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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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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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
- C22C38/18—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
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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- 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
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- 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
- C21D2211/001—Austenite
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Description
ここで、CNi−Minは表面でのNiの最小濃度であり、CNi−Aveは表面でのNiの平均濃度である。
ここで、CNi−Maxは表面でのNi最大濃度であり、CNi−Avは表面でのNiの最小濃度である。
ここで、CNi−Minは表面でのNiの最小濃度であり、CNi−Aveは表面でのNiの平均濃度である。
ここで、CNi−Minは表面でのNiの最小濃度であり、CNi−Aveは表面でのNiの平均濃度である。
ここで、CNi−Maxは表面でのNi最大濃度であり、CNi−Aveは表面でのNiの最小濃度である。
下記の表1の発明例1〜9、そして比較例1〜6の成分を含むオーステナイト系ステンレス鋼スラブを連続鋳造して製造した。以降、熱間圧延および、50%総圧下率で冷間圧延を経て、冷延鋼板を製造した。
Claims (6)
- 重量%で、C:0.005〜0.15%、Si:0.1〜1.0%、Mn:0.1〜2.0%、Ni:6.0〜10.5%、Cr:16〜20%、N:0.005〜0.2%、Mo:0.01〜0.2%、Cu:0.1〜4.0%、残りはFeおよび不可避不純物からなり、
下記式(1)で定義されるNiの表面負偏析度が0.60〜0.90の範囲であり、
下記式(2)で定義されるNi表面偏析比が1.10〜1.60の範囲であることを特徴とする加工性および表面特性が優秀なオーステナイト系ステンレス鋼。
(CNi−Min)/(CNi−Ave)・・・式(1)
(C Ni−Max )/(C Ni−Min )・・・式(2)
ここで、CNi−Minは表面でのNiの最小濃度であり、CNi−Aveは表面でのNiの平均濃度であり、C Ni−Max は表面でのNi最大濃度である。 - 表面でのNiの濃度が平均濃度より大きいNi濃化領域であるNi表面偏析部は、面積分率で60%未満であり、
表面でのNiの濃度が平均濃度より小さいNi欠乏領域であるNi表面負偏析部は、面積分率で5%超過であることを特徴とする請求項1に記載の加工性および表面特性が優秀なオーステナイト系ステンレス鋼。 - 前記Ni濃化領域は表面でのNiの平均濃度より1.2倍以上のNi濃度を有し、前記Ni欠乏領域は表面でのNiの平均濃度より0.8倍以下のNi濃度を有することを特徴とする請求項2に記載の加工性および表面特性が優秀なオーステナイト系ステンレス鋼。
- 前記Ni表面負偏析部は長径が100μm以下である偏析を60%以上含むことを特徴とする請求項2に記載の加工性および表面特性が優秀なオーステナイト系ステンレス鋼。
- 60%以上の伸び率を有することを特徴とする請求項1に記載の加工性および表面特性が優秀なオーステナイト系ステンレス鋼。
- 請求項1乃至5のうちいずれか一項による加工性および表面特性が優秀なオーステナイト系ステンレス鋼の製造方法において、
重量%で、C:0.005〜0.15%、Si:0.1〜1.0%、Mn:0.1〜2.0%、Ni:6.0〜10.5%、Cr:16〜20%、N:0.005〜0.2%、Mo:0.01〜0.2%、Cu:0.1〜4.0%、残りはFeおよび不可避不純物からなるオーステナイト系ステンレス鋼を連続鋳造する段階を含み、
前記連続鋳造する段階は、
2次冷却帯において、1,150〜1,200℃である第1温度区間で鋳片を60℃/min以上の速度で冷却する段階、
900〜1,150℃である第2温度区間で鋳片を10℃/min以下の速度で冷却す
る段階、および
900℃以下である第3温度区間で鋳片を20℃/min以上の速度で冷却する段階からなる2次冷却段階を含み、
前記2次冷却段階で冷却された鋳片を熱間圧延する段階、および
前記熱間圧延された鋳片を冷間圧延する段階を含み、
前記熱間圧延時、連続鋳造されたオーステナイト系ステンレス鋼のスラブの5時間以内に再加熱し、
前記熱間圧延以降、熱延焼鈍または前記冷間圧延以降、冷延焼鈍する時は、1,000〜1,200℃の焼鈍温度にまで30秒以内に昇温させた後、維持時間は30秒以内であり、
下記式(1)で表示されるNiの表面負偏析度が0.60〜0.90の範囲を満足し、下記式(2)で表示されるNi表面偏析比が1.10〜1.60の範囲を満足することを特徴とする加工性および表面特性が優秀なオーステナイト系ステンレス鋼の製造方法。
(C Ni−Min )/(C Ni−Ave )・・・式(1)
(C Ni−Max )/(C Ni−Min )・・・式(2)
ここで、C Ni−Min は表面でのNiの最小濃度であり、C Ni−Ave は表面でのNiの平均濃度であり、C Ni−Max は表面でのNi最大濃度である。
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KR1020170176063A KR102030162B1 (ko) | 2016-12-23 | 2017-12-20 | 가공성 및 표면특성이 우수한 오스테나이트계 스테인리스강 및 이의 제조방법 |
PCT/KR2017/015227 WO2018117683A1 (ko) | 2016-12-23 | 2017-12-21 | 가공성 및 표면특성이 우수한 오스테나이트계 스테인리스강 및 이의 제조방법 |
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JPS5732325A (en) * | 1980-08-04 | 1982-02-22 | Nisshin Steel Co Ltd | Production of austenitic stainless steel plate |
JPS59229471A (ja) * | 1983-06-10 | 1984-12-22 | Nippon Yakin Kogyo Co Ltd | 熱間加工性に優れた高窒素含有オ−ステナイトステンレス鋼 |
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US11542569B2 (en) | 2023-01-03 |
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EP3561127A4 (en) | 2019-10-30 |
CN110225992A (zh) | 2019-09-10 |
KR20180074590A (ko) | 2018-07-03 |
US20200087752A1 (en) | 2020-03-19 |
CN110225992B (zh) | 2021-10-29 |
MX2019007617A (es) | 2019-11-05 |
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