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公开(公告)号：WO2021084302A1
公开(公告)日：2021-05-06
申请号：PCT/IB2019/059285
申请日：2019-10-30
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a steel sheet coated with a pre-coating being directly topped by a hydrogen barrier pre-coating, B. the batch annealing of the pre-coated steel sheet to obtain a pre-alloyed steel sheet, the cooling after the batch annealing being performed at a speed of 29.0 °C.h-1 or less, C. the cutting of the pre-alloyed steel sheet to obtain blank, D. the thermal treatment of the blank to obtain a fully austenitic microstructure in the steel, E. the transfer of the blank into a press tool, F. the hot-forming of the blank to obtain a part, G. the cooling of the part obtained at step F) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75wt.% of equiaxed ferrite, from 5 to 20wt.% of martensite and bainite in amount less than or equal to 10wt.%.
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公开(公告)号：WO2021084305A1
公开(公告)日：2021-05-06
申请号：PCT/IB2019/059288
申请日：2019-10-30
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00 , C23C2/02 , C23C2/06 , C23C2/26 , C23C14/58 , C23C16/54 , C23C28/02 , C21D9/46 , C22C38/00
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a steel sheet being optionally coated with an anticorrosion pre-coating, B. the flexible rolling of the steel sheet so as to obtain a steel sheet having a variable thickness, C. the cutting of the rolled steel sheet to obtain a tailored rolled blank, D. the deposition of a hydrogen barrier pre-coating, E. the thermal treatment of the tailored rolled blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the tailored rolled blank into a press tool, G. the hot-forming of the tailored rolled blank to obtain a part having a variable thickness, H. the cooling of the part having a variable thickness obtained at step G) in order to obtain a microstructure in steel being martensitic or martensito- bainitic or made of at least 75wt.% of equiaxed ferrite, from 5 to 20wt.% of martensite and bainite in amount less than or equal to 10wt.%.
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公开(公告)号：WO2021084304A1
公开(公告)日：2021-05-06
申请号：PCT/IB2019/059287
申请日：2019-10-30
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00 , C23C2/02 , C23C2/06 , C23C2/26 , C23C14/58 , C23C16/54 , C23C28/02 , C21D9/46 , C22C38/00
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a steel sheet coated with a barrier pre-coating comprising chromium and not comprising nickel, B. the cutting of the coated steel sheet to obtain a blank, C. the thermal treatment of the blank in an atmosphere having an oxidizing power equal or higher than that of an atmosphere consisting of 1% by volume of oxygen and equal or smaller than that of an atmosphere consisting of 50% by volume of oxygen, such atmosphere having a dew point between -30 and +30°C, D. the transfer of the blank into a press tool, E. the hot-forming of the blank to obtain a part, F. the cooling of the part obtained at step E) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75wt.% of equiaxed ferrite, from 5 to 20wt.% of martensite and bainite in amount less than or equal to 10wt.%.
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公开(公告)号：WO2021084303A1
公开(公告)日：2021-05-06
申请号：PCT/IB2019/059286
申请日：2019-10-30
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a steel sheet coated with a pre-coating being directly topped by a hydrogen barrier pre-coating, B. the batch annealing of the pre-coated steel sheet in an inert atmosphere to obtain a pre-alloyed steel sheet, C. the cutting of the pre-alloyed steel sheet to obtain blank, D. the thermal treatment of the blank to obtain a fully austenitic microstructure in the steel, E. the transfer of the blank into a press tool, F. the hot-forming of the blank to obtain a part, G. the cooling of the part obtained at step F) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75wt.% of equiaxed ferrite, from 5 to 20wt.% of martensite and bainite in amount less than or equal to 10wt.%.
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公开(公告)号：WO2021084379A1
公开(公告)日：2021-05-06
申请号：PCT/IB2020/059842
申请日：2020-10-20
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00 , C23C2/02 , C23C2/06 , C23C2/26 , C23C14/58 , C23C16/54 , C23C28/02 , C21D9/46 , C22C38/00
摘要： The present invention relates a press hardening method comprising the following steps: A. the provision of a steel sheet for heat treatment being optionally coated with a zinc- or aluminum-based pre-coating, B. the flexible rolling of the steel sheet in the rolling direction so as to obtain a steel sheet having a variable thickness, C. the cutting of the rolled steel sheet to obtain a tailored rolled blank, D. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, E. the heat treatment of the tailored rolled blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the tailored rolled blank into a press tool, G. the hot-forming of the tailored rolled blank to obtain a part having a variable thickness, H. the cooling of the part having a variable thickness obtained at step G) to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75% in terms of volume fraction of equiaxed ferrite, from 5 to 20% in volume of martensite and of bainite in amount less than or equal to 10% in volume.
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公开(公告)号：WO2021084378A1
公开(公告)日：2021-05-06
申请号：PCT/IB2020/059841
申请日：2020-10-20
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00 , C23C2/02 , C23C2/06 , C23C2/26 , C23C14/58 , C23C16/54 , C23C28/02 , C21D9/46 , C22C38/00
摘要： The present invention relates a press hardening method comprising the following steps: A. the provision of a steel sheet for heat treatment, being optionally precoated with a zinc- or aluminum-based pre-coating, B. The deposition of a hydrogen barrier pre-coating comprising chromium and not comprising nickel over a thickness from 10 to 550 nm, C. the cutting of the precoated steel sheet to obtain a blank, D. the heat treatment of the blank at a furnace temperature from 800 to 970°C, during a dwell time from 1 to 12 minutes, in an atmosphere having an oxidizing power equal or higher than that of an atmosphere consisting of 1 % by volume of oxygen and equal or smaller than that of an atmosphere consisting of 50% by volume of oxygen, such atmosphere having a dew point between -30 and +30°C, E. the transfer of the blank into a press tool, F. the hot-forming of the blank at a temperature from 600 to 830°C to obtain a part, G. the cooling of the part obtained at step E) to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75 % in terms of volume fraction of equiaxed ferrite, from 5 to 20 % in volume of martensite and bainite in amount less than or equal to 10 % in volume.
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公开(公告)号：WO2021084377A1
公开(公告)日：2021-05-06
申请号：PCT/IB2020/059838
申请日：2020-10-20
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a steel sheet for heat treatment, precoated with a zinc- or aluminum-based pre-coating for anti-corrosion purpose, B. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, C. the batch annealing of the precoated steel sheet in an inert atmosphere to obtain a pre-alloyed steel sheet, D. the cutting of the pre-alloyed steel sheet to obtain blank, E. the thermal treatment of the blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the blank into a press tool, G. the hot-forming of the blank to obtain a part, H. the cooling of the part obtained at step G) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75 % in terms of volume fraction of equiaxed ferrite, from 5 to 20 % in volume of martensite and bainite in amount less than or equal to 10 % in volume.
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公开(公告)号：WO2021084376A1
公开(公告)日：2021-05-06
申请号：PCT/IB2020/059837
申请日：2020-10-20
申请人： ARCELORMITTAL
IPC分类号： C21D8/04 , B32B15/00 , C21D8/02 , C21D9/48 , C23C2/00 , C23C2/04 , C23C2/12 , C21D1/74 , C23C2/28 , C23C2/40 , C23C28/00
摘要： The present invention relates a press hardening method comprises the following steps: A. The provision of a steel sheet for heat-treatment, precoated with a zinc- or aluminum-based pre-coating, B. the deposition of a hydrogen barrier pre-coating over a thickness from 10 to 550 nm, and comprising at least one element chosen from among: nickel, chromium, magnesium, aluminum and yttrium, C. the batch annealing of the precoated steel sheet to obtain a pre-alloyed steel sheet, the cooling after the batch annealing being performed at a speed of 29.0 °C.h-1 or less, D. the cutting of the pre-alloyed steel sheet to obtain blank, E. the thermal treatment of the blank to obtain a fully austenitic microstructure in the steel, F. the transfer of the blank into a press tool, G. the hot-forming of the blank to obtain a part, H. the cooling of the part obtained at step G) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75% in terms of volume fraction of equiaxed ferrite, from 5 to 20% in volume of martensite and of bainite in amount less than or equal to 10% in volume.
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公开(公告)号：WO2020070575A1
公开(公告)日：2020-04-09
申请号：PCT/IB2019/057970
申请日：2019-09-20
申请人： ARCELORMITTAL
发明人： DRILLET, Pascal , GRIGORIEVA, Raisa , STUREL, Thierry , GEORGES, Cédric , NABI, Brahim , DUMINICA, Florin
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a carbon steel sheet coated with a barrier pre-coating comprising nickel and chromium wherein the weight ratio Ni/Cr is between 1.5 and 9, B. the cutting of the coated carbon steel sheet to obtain a blank, G. the thermal treatment of the blank in an atmosphere having an oxidizing power equal or higher than that of an atmosphere consisting of 1% by volume of oxygen and equal or smaller than that of an atmosphere consisting of 50% by volume of oxygen, such atmosphere having a dew point between -30 and +30°C, C. the transfer of the blank into a press tool, D. the hot-forming of the blank to obtain a part, E. the cooling of the part obtained at step E) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75wt.% of equiaxed ferrite, from 5 to 20wt.% of martensite and bainite in amount less than or equal to 10wt.%.
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公开(公告)号：WO2020070545A1
公开(公告)日：2020-04-09
申请号：PCT/IB2018/057719
申请日：2018-10-04
申请人： ARCELORMITTAL
发明人： DRILLET, Pascal , GRIGORIEVA, Raisa , STUREL, Thierry , GEORGES, Cédric , NABI, Brahim , DUMINICA, Florin
摘要： The present invention relates a press hardening method comprises the following steps: A. the provision of a carbon steel sheet coated with a barrier pre-coating comprising nickel and chromium wherein the weight ratio Ni/Cr is between 1.5 and 9, B. the cutting of the coated carbon steel sheet to obtain a blank, G. the thermal treatment of the blank in an atmosphere having an oxidizing power equal or higher than that of an atmosphere consisting of 1% by volume of oxygen and equal or smaller than that of an atmosphere consisting of 50% by volume of oxygen, such atmosphere having a dew point between -30 and +30°C, C. the transfer of the blank into a press tool, D. the hot-forming of the blank to obtain a part, E. the cooling of the part obtained at step E) in order to obtain a microstructure in steel being martensitic or martensito-bainitic or made of at least 75wt.% of equiaxed ferrite, from 5 to 20wt.% of martensite and bainite in amount less than or equal to 10wt.%.
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