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公开(公告)号：US20220316021A1
公开(公告)日：2022-10-06
申请号：US17596676
申请日：2020-06-11
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Shangping CHEN , Richard MOSTERT , Maxim Peter AARNTS , Stefanus Matheus Cornelis VAN BOHEMEN
Abstract: A method of a heat treating a cold rolled steel strip includes the steps of soaking a cold rolled steel strip above (Ac3−20) for a certain soaking duration thereby obtaining a cold rolled steel strip having an austenitic microstructure; cooling the soaked steel strip to below Ms; heating and heat treating the cooled strip in the temperature range of Bs-Ms; and cooling the heat treated strip to ambient temperature.
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公开(公告)号：US20220064765A1
公开(公告)日：2022-03-03
申请号：US17500253
申请日：2021-10-13
Applicant: TATA STEEL IJMUIDEN B.V.
Abstract: The invention relates to a steel strip, sheet or blank used for painted parts, wherein the steel strip, sheet or blank is optionally metallic coated. The steel is an Ultra Low Carbon (ULC) steel type having a composition of (in weight %): C: max 0.007 Mn: max 1.2 Si: max 0.5 Al: max 0.1 P: max 0.15 S: 0.003-0.045 N: max 0.01 Ti, Nb, Mo: if Ti≥0.005 and Nb≥0.005: 0.06≤4Ti+4Nb+2Mo≤0.60 otherwise 0.06≤Ti+2Nb+2Mo≤0.60 and one or more of the optional elements: Cu: max 0.10, Cr: max 0.06. Ni: max 0.08, B: max 0.0015, V: max 0.01, Ca: max 0.01, Co: max 0.01, Sn: max 0.01 resulting in a delta Waviness ΔWsa≤0.12 μm of the surface after the forming of the strip, sheet or blank.
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公开(公告)号：US20230045924A1
公开(公告)日：2023-02-16
申请号：US17786402
申请日：2020-12-18
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Rolf Arjan RIJKENBERG , Shangping CHEN , Maxim Peter AARNTS
IPC: C21D9/52 , C22C38/38 , C22C38/32 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C22C38/02 , C22C38/00 , C21D8/02 , C21D6/00
Abstract: The invention relates to a high strength steel with a careful selection of the normal alloying elements C, Mn, Si and Al, together with micro-element addition. This a steel with a high strength and high hole expansion ratio can be produced. The invention also relates to the method to manufacture this high strength steel.
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公开(公告)号：US20220316026A1
公开(公告)日：2022-10-06
申请号：US17596685
申请日：2020-06-11
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Shangping CHEN , Richard MOSTERT , Maxim Peter AARNTS , Stefanus Matheus Cornelis VAN BOHEMEN
IPC: C21D9/52 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/20 , C22C38/06 , C22C38/02 , C22C38/00 , C23C2/40 , C21D8/02 , C21D6/00
Abstract: A method of heat treating a cold rolled steel strip includes soaking a cold rolled steel strip having a specific composition above (Ac3−60)° C. for a certain duration thereby obtaining a cold rolled strip having a partially austenitic microstructure; cooling of the resulting soaked steel strip to a temperature below Ms; heating and heat treating the cooled steel strip in the temperature range of Bs-Ms; and cooling the heat treated steel strip to ambient temperature.
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公开(公告)号：US20220316025A1
公开(公告)日：2022-10-06
申请号：US17596682
申请日：2020-06-11
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Shangping CHEN , Richard MOSTERT , Maxim Peter AARNTS , Stefanus Matheus Cornelis VAN BOHEMEN
IPC: C21D9/52 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/20 , C22C38/06 , C22C38/02 , C22C38/00 , C23C2/40 , C21D8/02 , C21D6/00
Abstract: A heat treatment of a high strength cold rolled steel strip includes the steps of a) soaking a cold rolled steel strip, b) cooling the soaked steel strip c) heat treating the cooled strip; d) cooling the heat treated steel strip to ambient temperature range; such that the steel strip has a microstructure including various ferrites, retained austenite and martensite. The main components in the steel composition include carbon, manganese, silicon and aluminium in addition to iron.
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Patent Agency Ranking
公开(公告)号：US20200040424A1
公开(公告)日：2020-02-06
申请号：US16340272
申请日：2017-10-13
Applicant: TATA STEEL IJMUIDEN B.V.
Abstract: A steel strip, sheet or blank used for painted parts, wherein the steel strip, sheet or blank is optionally metallic coated.According to the invention, the steel has grains with an essentially equi-axed median grain size smaller than 11.0 micrometer, resulting in a difference in Waviness ΔWsa≤0.12 μm between the surface before and after the forming of the strip, sheet or blank.The invention also relates to a method for producing such a steel strip.
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公开(公告)号：US20220316024A1
公开(公告)日：2022-10-06
申请号：US17596673
申请日：2020-06-11
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Shangping CHEN , Richard MOSTERT , Maxim Peter AARNTS , Stefanus Matheus Cornelis VAN BOHEMEN
IPC: C21D9/52 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/20 , C22C38/06 , C22C38/02 , C22C38/00 , C23C2/40 , C21D8/02 , C21D6/00
Abstract: A method of heat treating a high strength cold rolled steel strip including a) soaking a cold rolled steel strip, b) cooling the soaked steel strip c) heat treating the cooled strip; d) cooling the heat treated steel strip to ambient temperature range; such that the steel strip has a microstructure including various ferrites, retained austenite and martensite. The main components in the steel composition includes carbon, manganese, silicon and aluminium in addition to iron.
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公开(公告)号：US20200087761A1
公开(公告)日：2020-03-19
申请号：US16340299
申请日：2017-10-13
Applicant: TATA STEEL IJMUIDEN B.V.
Abstract: A steel strip, sheet or blank used for painted parts, the steel strip, sheet or blank is optionally metallic coated.The steel is an Ultra Low Carbon (ULC) steel type having a composition of (in weight %): C: max 0.007 Mn: max 1.2 Si: max 0.5 Al: max 0.1 P: max 0.15 S: 0.003-0.045 N: max 0.01 Ti, Nb, Mo: if Ti≥0.005 and Nb≥0.005: 0.06≤4Ti+4Nb+2Mo≤0.60 otherwise 0.06≤Ti+2Nb+2Mo≤0.60 and one or more of the optional elements: Cu: max 0.10 Cr: max 0.06 Ni: max 0.08 B: max 0.0015 V: max 0.01 Ca: max 0.01 Co: max 0.01 Sn: max 0.01 resulting in a delta Waviness ΔWsa≤0.12 μm of the surface after the forming of the strip, sheet or blank.
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9.发明申请公开(公告)号：US20190352736A1
公开(公告)日：2019-11-21
申请号：US16331324
申请日：2017-09-22
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Rolf Arjan RIJKENBERG , Maxim Peter AARNTS , Paul Joseph BELLINA , Andrew Paul VASS
IPC: C21D9/52 , C21D9/46 , C21D8/02 , C21D6/00 , C22C38/12 , C22C38/04 , C22C38/02 , C22C38/00 , C22C38/06
Abstract: A method to manufacture a hot-rolled high-strength steel sheet or strip with tensile strength of 570 MPa or higher, or preferably 780 MPa or higher, or even more preferably 980 MPa or higher, with an excellent combination of tensile elongation, SFF, and PEF strength.
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10.发明申请公开(公告)号：US20180265939A1
公开(公告)日：2018-09-20
申请号：US15761322
申请日：2016-09-21
Applicant: TATA STEEL IJMUIDEN B.V.
Inventor： Rolf Arjan RIJKENBERG , Maxim Peter AARNTS
IPC: C21D8/02 , C22C38/32 , C22C38/38 , C22C38/28 , C22C38/26 , C22C38/24 , C22C38/22 , C22C38/06 , C22C38/02 , C22C38/00 , C21D9/46
Abstract: A hot-rolled high-strength steel strip or sheet with excellent roll-forming characteristics and excellent stretch-flange formability suitable for automotive chassis part or the like and, more particularly, to a high-strength steel strip or sheet with tensile strength of 780 MPa or higher, or preferably 950 MPa or higher, with an excellent combination of total elongation, stretch-flange formability and fatigue resistance and to a method of manufacturing the steel strip or sheet, and to the use of the strip or sheet in a part.
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