公开(公告)号：US12054802B2

公开(公告)日：2024-08-06

申请号：US18195578

申请日：2023-05-10

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Sebastien Cremel ,  Anirban Chakraborty ,  Damon Panahi ,  Olga Girina ,  Hassan Ghassemi-Armaki ,  Pavan Challa Venkata Surya ,  Yacine Benlatreche

IPC: C21D9/50 ,  B23K11/11 ,  B23K11/16 ,  B23K31/12 ,  B23K37/04 ,  C21D1/76 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/38 ,  C23C2/02 ,  C23C2/26 ,  C23C2/40 ,  C23F17/00 ,  C25D5/36 ,  B23K101/00 ,  B23K103/04 ,  C23C2/06 ,  C25D3/22

CPC classification number: C21D9/50 ,  B23K11/115 ,  B23K11/163 ,  B23K31/125 ,  B23K37/0408 ,  C21D1/76 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0247 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/38 ,  C23C2/02 ,  C23C2/0222 ,  C23C2/0224 ,  C23C2/024 ,  C23C2/26 ,  C23C2/40 ,  C23F17/00 ,  C25D5/36 ,  B23K2101/006 ,  B23K2103/04 ,  C21D2211/001 ,  C21D2211/008 ,  C23C2/06 ,  C25D3/22

Abstract: A method for producing a zinc or zinc-alloy coated steel sheet with a tensile strength higher than 900 MPa, for the fabrication of resistance spot welds containing in average not more than two Liquid Metal Embrittlement cracks per weld having a depth of 100 μm or more, with steps of providing a cold-rolled steel sheet, heating cold-rolled steel sheet up to a temperature T1 between 550° C. and Ac1+50° C. in a furnace zone with an atmosphere (A1) containing from 2 to 15% hydrogen by volume, so that the iron is not oxidized, then adding in the furnace atmosphere, water steam or oxygen with an injection flow rate Q higher than (0.07%/h×α), α being equal to 1 if said element is water steam or equal to 0.52 if said element is oxygen, at a temperature T≥T1, so to obtain an atmosphere (A2) with a dew point DP2 between −15° C. and the temperature Te of the iron/iron oxide equilibrium dew point, then heating the sheet from temperature T1 up to a temperature T2 between 720° C. and 1000° C. in a furnace zone under an atmosphere (A2) of nitrogen containing from 2 to 15% hydrogen and more than 0.1% CO by volume, with an oxygen partial pressure higher than 10−21 atm., wherein the duration to of heating of the sheet from temperature T1 up to the end of soaking at temperature T2 is between 100 and 500 s, soaking the sheet at T2, then cooling the sheet at a rate between 10 and 400° C./s, then coating the sheet with zinc or zinc-alloy coating.

公开(公告)号：US12065724B2

公开(公告)日：2024-08-20

申请号：US16467371

申请日：2017-12-19

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Marc Olivier Thenot

IPC: C22C38/04 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/06 ,  C23C2/28

CPC classification number: C22C38/04 ,  C21D8/0226 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C23C2/02 ,  C23C2/0224 ,  C23C2/06 ,  C23C2/28 ,  C23C2/29 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A tempered and coated steel sheet having a composition containing the following elements, expressed in percentage by weight: 0.17%≤carbon≤0.25%, 1.8%≤manganese≤2.3%, 0.5%≤silicon≤2.0%, 0.03%≤aluminum≤1.2%, sulphur≤0.03%, phosphorus≤0.03%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet containing in area fraction, 3 to 20% residual austenite, at least 15% of ferrite, 40 to 85% tempered bainite and a minimum of 5% of tempered martensite, wherein cumulated amounts of tempered martensite and residual austenite is between 10 and 30%. The composition may also contain one or more of the following elements chromium≤0.4%, molybdenum≤0.3%, niobium≤0.04%, titanium≤0.1%. Methods of manufacturing and use of the tempered and coated steel sheets are also described.

公开(公告)号：US11655516B2

公开(公告)日：2023-05-23

申请号：US16467643

申请日：2017-12-15

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Marc Olivier Thenot

IPC: C21D9/46 ,  C21D1/20 ,  C21D1/22 ,  C21D8/02 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/012 ,  C21D1/20 ,  C21D1/22 ,  C21D8/0263 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/22 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C23C2/06 ,  C23C2/40 ,  B32B2605/08 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008 ,  C22C2204/00

Abstract: A tempered and coated steel sheet having a composition containing the following elements, expressed in percentage by weight:



0.17%≤carbon≤0.25%,
1.8%≤manganese≤2.3%,
0.5%≤silicon≤2.0%,
0.03%≤aluminum≤1.2%,
sulphur≤0.03%,
phosphorus≤0.03%,

the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of said steel sheet containing in area fraction, 4 to 20% residual austenite, 0 to 15% of ferrite, 40 to 85% tempered bainite and a minimum of 5% of tempered martensite, wherein the cumulated amounts of tempered martensite and residual austenite is between 10 and 30%. The composition may also contain one or more of the following elements: chromium≤0.4%, molybdenum≤0.3%, niobium≤0.04%, titanium≤0.1%. Manufacturing methods and use of tempered and coated steel sheet for making vehicle parts are also described.

公开(公告)号：US11920207B2

公开(公告)日：2024-03-05

申请号：US16761417

申请日：2018-11-05

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Artem Arlazarov

IPC: C21D9/46 ,  B21B3/02 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

CPC classification number: C21D9/46 ,  B21B3/02 ,  C21D6/004 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0247 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/008

Abstract: A cold rolled heat treated steel sheet having a composition with the following elements, expressed in percentage by weight 0.1%≤Carbon≤0.5%, 1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.03%≤Aluminum≤1.5%, 0%≤Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, 0%≤Nitrogen≤0.01% and can contain one or more of the following optional elements 0.05%≤Chromium≤1%, 0.001%≤Molybdenum≤0.5%, 0.001%≤Niobium≤0.1%, 0.001%≤Titanium≤0.1%, 0.01%≤Copper≤2%, 0.01%≤Nickel≤3%, 0.0001%≤Calcium≤0.005%, 0%≤Vanadium≤0.1%, 0%≤Boron≤0.003%, 0%≤Cerium≤0.1%, 0%≤Magnesium≤0.010%, 0%≤Zirconium≤0.010%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet having in area fraction, 10 to 30% Residual Austenite, 50 to 85% Bainite, 1 to 20% Quenched Martensite, and less than 30% Tempered Martensite.

公开(公告)号：US11365468B2

公开(公告)日：2022-06-21

申请号：US16761086

申请日：2018-11-05

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Artem Arlazarov

IPC: C22C38/00 ,  C22C38/58 ,  C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54

Abstract: A cold rolled and heat treated steel sheet having a composition with the following elements, expressed in percentage by weight 0.10%≤Carbon≤0.5%, 1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.03%≤Aluminum≤1.5%, Sulfur≤0.003%, 0.002%≤Phosphorus≤0.02%, Nitrogen≤0.01% and can contain one or more of the following optional elements 0.05%≤Chromium≤1%, 0.001%≤Molybdenum≤0.5%, 0.001%≤Niobium≤0.1%, 0.001%≤Titanium≤0.1%, 0.01%≤Copper≤2%, 0.01%≤Nickel≤3%, 0.0001%≤Calcium≤0.005%, Vanadium≤0.1%, Boron≤0.003%, Ceriums≤0.1%, Magnesiums≤0.010%, Zirconiums≤0.010% the remainder composition being composed of iron and the unavoidable impurities caused by processing, and a microstructure of the said rolled steel sheet having by area fraction, 10 to 30% Residual Austenite, 5 to 50% Annealed Bainite, 10 to 40% of Bainite, 1% to 20% Quenched Martensite, and less than 30% Tempered Martensite where the combined presence of Bainite and Residual Austenite shall be 30% or more.

公开(公告)号：US11795519B2

公开(公告)日：2023-10-24

申请号：US16761450

申请日：2018-11-05

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard

IPC: C21D9/46 ,  C21D8/02 ,  C21D6/00 ,  C22C38/38 ,  C22C38/28 ,  C22C38/26 ,  C22C38/24 ,  C22C38/06 ,  C22C38/02 ,  C22C38/00 ,  B32B15/01

CPC classification number: C21D9/46 ,  B32B15/013 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0226 ,  C21D8/0236 ,  C21D8/0263 ,  C22C38/001 ,  C22C38/002 ,  C22C38/02 ,  C22C38/06 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28 ,  C22C38/38 ,  C21D2211/001 ,  C21D2211/002 ,  C21D2211/005 ,  C21D2211/008

Abstract: A cold rolled and heat treated steel sheet, the steel having a composition with, in weight percentage,



0.18%≤carbon≤0.24%,
1.5%≤manganese≤2.5%,
1.2%≤silicon≤2%,
0.01%≤aluminum≤0.06%,
0.2%≤chromium≤0.5%,
phosphorus≤0.02%,
sulfur≤0.03%,
and optionally one or more of the following elements
niobium≤0.06%,
titanium≤0.08%,
vanadium≤0.1%,
calcium≤0.005%
and the balance including iron and unavoidable impurities, the steel sheet having a microstructure having 0% to 15% of tempered martensite, 10% to 15% of residual austenite and optionally up to 30% of ferrite in area fractions, the balance being made of bainite, bainite content being at least 55% and having an internal oxide layer of 3 microns or less on both surfaces of the steel sheet. A manufacturing method and with use of such grade for making vehicle parts is also provided.

公开(公告)号：US11572599B2

公开(公告)日：2023-02-07

申请号：US16761319

申请日：2018-11-05

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Artem Arlazarov

IPC: C21D9/46 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/06 ,  C22C38/42 ,  C22C38/44 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C22C38/54 ,  C22C38/58

Abstract: A cold rolled and heat treated steel sheet having a composition with the following elements, expressed in percentage by weight: 0.10%≤Carbon≤0.5%,1%≤Manganese≤3.4%, 0.5%≤Silicon≤2.5%, 0.03%≤Aluminum≤1.5%, 0%≤Sulfur≤0.003% 0.002%≤Phosphorus≤0.02%, 0%≤Nitrogen≤0.01% and can contain one or more of the following optional elements 0.05%≤Chromium≤1%, 0.001%≤Molybdenum≤0.5%, 0.001%≤Niobium≤0.1%, 0.001%≤Titanium≤0.1%, 0.01%≤Copper≤2%, 0.01%≤Nickel≤3%, 0.0001%≤Calcium≤0.005%, 0%≤Vanadium≤0.1%, 0%≤Boron≤0.003%, 0%≤Cerium≤0.1%, 0%≤Magnesium≤0.010%, 0%≤Zirconium≤0.010% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet having in area fraction, 10 to 30% Residual Austenite, 10 to 40% Bainite, 5% to 50% Annealed Martensite, 1% to 20% Quenched Martensite and less than 30% Tempered Martensite, wherein the cumulated amounts of Bainite and Residual Austenite is more than or equal to 25%.

公开(公告)号：US11649522B2

公开(公告)日：2023-05-16

申请号：US16614734

申请日：2018-06-13

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Sebastien Cremel ,  Anirban Chakraborty ,  Damon Panahi ,  Olga Girina ,  Hassan Ghassemi-Armaki ,  Pavan Challa Venkata Surya ,  Yacine Benlatreche

IPC: C21D9/50 ,  C21D8/02 ,  C21D6/00 ,  C22C38/38 ,  C22C38/22 ,  C22C38/06 ,  C22C38/02 ,  C21D9/46 ,  C21D1/76 ,  C23C2/02 ,  C23C2/40 ,  C25D5/36 ,  C23F17/00 ,  B23K11/11 ,  B23K31/12 ,  B23K11/16 ,  B23K37/04 ,  B23K103/04 ,  B23K101/00 ,  C23C2/06 ,  C25D3/22

CPC classification number: C21D9/50 ,  B23K11/115 ,  B23K11/163 ,  B23K31/125 ,  B23K37/0408 ,  C21D1/76 ,  C21D6/002 ,  C21D6/005 ,  C21D6/008 ,  C21D8/0205 ,  C21D8/0236 ,  C21D8/0247 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/38 ,  C23C2/02 ,  C23C2/40 ,  C23F17/00 ,  C25D5/36 ,  B23K2101/006 ,  B23K2103/04 ,  C21D2211/001 ,  C21D2211/008 ,  C23C2/06 ,  C25D3/22

Abstract: A method for producing a zinc or zinc-alloy coated steel sheet with a tensile strength higher than 900 MPa, for the fabrication of resistance spot welds containing in average not more than two Liquid Metal Embrittlement cracks per weld having a depth of 100 μm or more, with steps of providing a cold-rolled steel sheet, heating cold-rolled steel sheet up to a temperature T1 between 550° C. and Ac1+50° C. in a furnace zone with an atmosphere (A1) containing from 2 to 15% hydrogen by volume, so that the iron is not oxidized, then adding in the furnace atmosphere, water steam or oxygen with an injection flow rate Q higher than (0.07%/h×α), α being equal to 1 if said element is water steam or equal to 0.52 if said element is oxygen, at a temperature T≥T1, so to obtain an atmosphere (A2) with a dew point DP2 between −15° C. and the temperature Te of the iron/iron oxide equilibrium dew point, then heating the sheet from temperature T1 up to a temperature T2 between 720° C. and 1000° C. in a furnace zone under an atmosphere (A2) of nitrogen containing from 2 to 15% hydrogen and more than 0.1% CO by volume, with an oxygen partial pressure higher than 10−21 atm., wherein the duration tD of heating of the sheet from temperature T1 up to the end of soaking at temperature T2 is between 100 and 500 s., soaking the sheet at T2, then cooling the sheet at a rate between 10 and 400° C./s, then coating the sheet with zinc or zinc-alloy coating.

公开(公告)号：US11279984B2

公开(公告)日：2022-03-22

申请号：US16470728

申请日：2017-12-19

Applicant: ArcelorMittal

Inventor： Jean-Marc Pipard ,  Marc Olivier Thenot ,  Pierre Targy

IPC: C21D8/02 ,  C22C38/00 ,  C22C38/06 ,  C22C38/34 ,  C22C38/38 ,  C21D1/19 ,  C22C38/24 ,  C22C38/26 ,  C22C38/28

Abstract: A cold rolled steel sheet, the steel containing, in weight percentage, 0.19%≤carbon≤0.24%, 1.9%≤manganese≤2.2%, 1.4%≤silicon≤1.6%, 0.01%≤aluminum≤0.06%, 0.2%≤chromium≤0.5%, phosphorus≤0.02%, sulfur≤0.003%, the balance including iron and unavoidable impurities, the steel sheet having a microstructure containing 5% to 15% of tempered martensite, 10% to 15% of residual austenite, the balance containing bainite, bainite content being at least 70%, is described. Also described is a manufacturing method and with use of such grade for making vehicle parts.