JP2020534438A - 高強度q&p鋼熱延コイルの軟化方法 - Google Patents
高強度q&p鋼熱延コイルの軟化方法 Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 78
- 239000010959 steel Substances 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 claims abstract description 34
- 238000005096 rolling process Methods 0.000 claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 18
- 238000001816 cooling Methods 0.000 claims abstract description 14
- 238000004804 winding Methods 0.000 claims abstract description 11
- 238000005098 hot rolling Methods 0.000 claims description 10
- 238000002791 soaking Methods 0.000 claims description 10
- 230000009467 reduction Effects 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 20
- 238000004519 manufacturing process Methods 0.000 abstract description 13
- 238000000137 annealing Methods 0.000 abstract description 8
- 238000005097 cold rolling Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229910000734 martensite Inorganic materials 0.000 description 7
- 238000010583 slow cooling Methods 0.000 description 6
- 238000005275 alloying Methods 0.000 description 4
- 229910001566 austenite Inorganic materials 0.000 description 4
- 238000009413 insulation Methods 0.000 description 4
- 229910001563 bainite Inorganic materials 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000010791 quenching Methods 0.000 description 3
- 238000005496 tempering Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910001567 cementite Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000000171 quenching effect Effects 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
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- 238000005482 strain hardening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
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- 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
- C21D9/02—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for springs
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/22—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length
- B21B1/24—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process
- B21B1/26—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling plates, strips, bands or sheets of indefinite length in a continuous or semi-continuous process by hot-rolling, e.g. Steckel hot mill
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- 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
- C21D1/19—Hardening; Quenching with or without subsequent tempering by interrupted quenching
- C21D1/22—Martempering
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- 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 by deformation combined with, or followed by, heat treatment
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- 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 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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- 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 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
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- 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
- C21D9/0006—Details, accessories not peculiar to any of the following furnaces
- C21D9/0025—Supports; Baskets; Containers; Covers
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- 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
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
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- Organic Chemistry (AREA)
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Abstract
Description
本発明は、3代目の自動車用先進高強度鋼の生産技術分野に属し、具体的には、高強度Q&P鋼熱延コイルの軟化方法に関する。
自動車業界で軽量化と衝突安全性に対する要求が高まるにつれて、ホワイトボディにおける先進高強度鋼の使用割合は増加する傾向にある。自動車用鋼の総合的力学特性である強伸度積UT(引張強度×伸び)指標によって分けると:
1代目の高強度鋼のUTは15±10GPa%で、軽量化と安全性指標は低い;
2代目の高強度鋼のUTは60±10GPa%で、強度も可塑性も望ましいが、プロセスが複雑で、合金含有量が高く、生産コストが高止まりしており、市販化は困難である;
3代目の高強度鋼のUTは30±10GPa%で、軽量化と安全性指標は1代目の高強度鋼よりも優れたが、生産コストは2代目の高強度鋼よりも顕著に低く、自動車及び冶金業界で広く注目を集める。
一つの種類は、例えば中国特許公告番号CN105177415A、CN105441814A、CN103215516A、CN103805851A、CN104532126A、CN103233161A、CN103805869A、CN102226248A等で開示された、製錬、熱間圧延により生産される熱延Q&P鋼であり、それは、プロセスが短く、生産コストが低いことを特徴とするが、熱間圧延層流冷却の制御がとても高く要求され、産業上で実現しにくく、且つ製品の表面品質が保証しにくい。
本発明の目的は、新規で、低コストで、効率的な高強度Q&P鋼熱延コイルの軟化方法を提供し、且つ自己焼戻軟化によって冷延Q&P鋼生産過程における中間焼鈍工程を置き換えることにある。
本発明にかかるQ&P鋼は、熱間圧延、焼入、巻取りを経ってから、インラインで速やかに独立で密閉な保温カバー装置を被せることで、鋼コイルに制御冷却を行い、巻取り残留熱を利用して効率的な自己焼戻軟化処理を行い、インラインでQ&P鋼熱延コイルの微細組織構造を調整し、マルテンサイトを分解させ、鋼コイル強度を低下させる目的を果たす。
好ましくは、鋼コイルの保温カバー内での保温時間は1〜24時間である。
ビレットの加熱温度が1200℃を下回ると、合金元素の均一化に不利である;温度が1300℃を上回ると、製造コストが上がるだけでなく、加熱品質の低下にも繋がる。よって、ビレットの加熱温度は通常、1200〜1300℃に適切に制御される。
(1)本発明は合理的な圧延プロセス設計により、革新的な熱延巻取り後の「モノコイル式」保温徐冷プロセスも併せて、インラインで、低コストで、効率的にQ&P鋼熱延コイルに制御冷却を行い、且つその微細組織構造を調整することができる。
以下、実施例および図面に基づいて本発明をさらに説明する。
Claims (7)
- Q&P鋼ビレットを加熱してから、粗圧延、仕上圧延、層流冷却及び巻取りを経って熱延コイルを得、巻出した後、インラインで保温カバーを被せて、輸送チェインに沿って鋼コイル倉庫へ移動し、保温時間に達したら、保温カバーから取り出して室温まで空冷することを特徴とする、高強度Q&P鋼熱延コイルの軟化方法;
ただし、巻取り温度は400〜600℃であり、前記のインラインで保温カバーを被せるのは、各熱延コイルをそれぞれ巻出した後、60分間以内に独立で密閉な保温カバー装置を被せると意味する;前記鋼コイルの保温カバー内での保温時間は≧60分間である。 - 前記ビレットの加熱温度は≧1150℃であり、均熱時間は≧60分間であることを特徴とする、請求項1に記載の高強度Q&P鋼熱延コイルの軟化方法。
- 前記ビレットの加熱温度は1200〜1300℃であり、均熱時間は1〜3時間であることを特徴とする、請求項1に記載の高強度Q&P鋼熱延コイルの軟化方法。
- 前記粗圧延及び仕上圧延は、完全オーステナイト化温度領域で行われ、全体的な熱間圧延圧下率は≧90%であり、仕上圧延温度は800〜1000℃であることを特徴とする、請求項1に記載の高強度Q&P鋼熱延コイルの軟化方法。
- 前記熱延コイルを巻出した後、20分間以内に独立で保温カバーを被せることを特徴とする、請求項1に記載の高強度Q&P鋼熱延コイルの軟化方法。
- 前記鋼コイルの保温カバー内での冷却速度は≦15℃/時間であることを特徴とする、請求項1に記載の高強度Q&P鋼熱延コイルの軟化方法。
- 前記鋼コイルの保温カバー内での保温時間は1〜24時間であることを特徴とする、請求項1に記載の高強度Q&P鋼熱延コイルの軟化方法。
Applications Claiming Priority (5)
Application Number | Priority Date | Filing Date | Title |
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CN201710853613.3 | 2017-09-20 | ||
CN201710853613.3A CN107470377A (zh) | 2017-09-20 | 2017-09-20 | 钢带制造流水线在线保温缓冷装置 |
CN201810631922.0 | 2018-06-19 | ||
CN201810631922.0A CN110616302B (zh) | 2018-06-19 | 2018-06-19 | 一种高强度q&p钢热轧卷的软化方法 |
PCT/CN2018/106703 WO2019057114A1 (zh) | 2017-09-20 | 2018-09-20 | 一种高强度q&p钢热轧卷的软化方法 |
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JP2020534438A true JP2020534438A (ja) | 2020-11-26 |
JPWO2019057114A5 JPWO2019057114A5 (ja) | 2023-01-11 |
JP7320512B2 JP7320512B2 (ja) | 2023-08-03 |
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US (1) | US11981972B2 (ja) |
EP (1) | EP3686296A4 (ja) |
JP (1) | JP7320512B2 (ja) |
KR (1) | KR102452598B1 (ja) |
WO (1) | WO2019057114A1 (ja) |
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CN112553437B (zh) * | 2020-12-07 | 2022-11-15 | 邯郸钢铁集团有限责任公司 | 控制420MPa级热镀锌高强钢屈服强度波动的方法 |
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- 2018-09-20 US US16/648,781 patent/US11981972B2/en active Active
- 2018-09-20 EP EP18857665.6A patent/EP3686296A4/en active Pending
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JP2001071019A (ja) * | 1999-09-09 | 2001-03-21 | Nkk Corp | スケール密着性に優れた高炭素熱延鋼板の製造方法 |
JP2010090475A (ja) * | 2008-09-10 | 2010-04-22 | Jfe Steel Corp | 高強度鋼板およびその製造方法 |
JP2013060657A (ja) * | 2011-08-19 | 2013-04-04 | Jfe Steel Corp | 伸びおよび伸びフランジ性に優れる高強度冷延鋼板ならびにその製造方法 |
JP2015175004A (ja) * | 2014-03-13 | 2015-10-05 | Jfeスチール株式会社 | 成形性に優れた高強度鋼板の製造方法 |
JP2016130334A (ja) * | 2015-01-13 | 2016-07-21 | Jfeスチール株式会社 | 熱延鋼帯、冷延鋼帯及び熱延鋼帯の製造方法 |
JP2016141848A (ja) * | 2015-02-03 | 2016-08-08 | Jfeスチール株式会社 | 成形性に優れた高強度鋼板の製造方法 |
CN104988391A (zh) * | 2015-07-07 | 2015-10-21 | 河北钢铁股份有限公司 | 一种1200MPa级冷轧Q&P钢及其制造方法 |
JP2019504202A (ja) * | 2015-12-23 | 2019-02-14 | ポスコPosco | 延性に優れた超高強度熱延鋼板及びその製造方法 |
CN105648317A (zh) * | 2016-01-28 | 2016-06-08 | 河北钢铁股份有限公司邯郸分公司 | 一种高强度高塑性中锰q&p钢冷轧退火板及其制备工艺 |
CN105734213A (zh) * | 2016-05-08 | 2016-07-06 | 东北大学 | 一种q&p钢板及其两次配分制备方法 |
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KR20200063163A (ko) | 2020-06-04 |
KR102452598B1 (ko) | 2022-10-07 |
US11981972B2 (en) | 2024-05-14 |
EP3686296A1 (en) | 2020-07-29 |
JP7320512B2 (ja) | 2023-08-03 |
US20200270714A1 (en) | 2020-08-27 |
WO2019057114A1 (zh) | 2019-03-28 |
EP3686296A4 (en) | 2020-07-29 |
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