公开(公告)号：US20240368723A1

公开(公告)日：2024-11-07

申请号：US18687274

申请日：2021-08-31

Applicant: ArcelorMittal

Inventor： Dorien DE KNIJF ,  Tom WATERSCHOOT ,  Ulrike LORENZ ,  Lode DUPREZ ,  Lieven BRACKE

IPC: C21D9/46 ,  C21D1/18 ,  C21D1/84 ,  C21D6/00 ,  C21D8/02 ,  C22C38/00 ,  C22C38/02 ,  C22C38/04 ,  C22C38/06 ,  C22C38/12 ,  C22C38/14

Abstract: A hot rolled steel sheet having a composition including of the elements, 0.02%≤Carbon≤0.2%, 3%≤Manganese≤9%, 0.2%≤Silicon≤1.2%, 0.9%≤Aluminum≤2.5%, 0%≤Phosphorus≤0.03%, 0%≤Sulfur≤0.03%, 0%≤Nitrogen≤0.025%, 0%≤Molybdenum≤0.6%, 0%≤Titanium≤0.1%, 0.0001%≤Boron≤0.01%, 0%≤Chromium≤0.5%, 0%≤Niobium≤0.1%, 0%≤Vanadium≤0.15%, 0%≤Nickel≤1%, 0%≤Copper≤1%, 0%≤Calcium≤0.005%, 0%≤Magnesium≤0.0010%, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet including in area fraction, at least 60% of tempered martensite, 15% to 40% residual austenite, 0% to 10% polygonal ferrite, 0% to 5% of bainite, 0 to 15% of fresh martensite and 0% to 5% of carbides of Niobium, Titanium, Vanadium or Iron.

公开(公告)号：US20240425956A1

公开(公告)日：2024-12-26

申请号：US18686951

申请日：2021-08-31

Applicant: ArcelorMittal

Inventor： Dorien DE KNIJF ,  Tom WATERSCHOOT ,  Ulrike LORENZ ,  Lode DUPREZ ,  Lieven BRACKE

IPC: C22C38/04 ,  C21D6/00 ,  C21D8/02 ,  C21D9/46 ,  C22C38/02 ,  C22C38/06

Abstract: A hot rolled steel sheet having a composition including, 0.02%≤Carbon≤0.2%, 3%≤Manganese≤9%, 0.2%≤Silicon≤1.2%, 0.9%≤Aluminum≤2.5%, 0%≤Phosphorus≤0.03%, 0%≤Sulfur≤0.03%, 0%≤Nitrogen≤0.025%, 0%≤Molybdenum≤0.6%, 0%≤Titanium≤0.1%, 0.0001%≤Boron≤0.01%, 0%≤Chromium≤0.5%, 0%≤Niobium≤0.1%, 0%≤Vanadium≤0.2%, 0%≤Nickel≤1%, 0%≤Copper≤1%, 0%≤Calcium≤0.005%, 0%≤Magnesium≤0.0010% the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet including in area fraction, at least 60% of tempered martensite, 15% to 40% residual austenite, 0% to 10% polygonal ferrite, 0% to 5% of bainite, 0 to 15% of fresh martensite and 0% to 5% of carbides of Niobium, Titanium, Vanadium or Iron.

公开(公告)号：US20210348245A1

公开(公告)日：2021-11-11

申请号：US17278085

申请日：2019-09-25

Applicant: ArcelorMittal

Inventor： Eva DIAZ GONZALEZ ,  Lieven BRACKE ,  Tom WATERSCHOOT ,  Joost DESTRYCKER

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

Abstract: A hot rolled steel product having a composition including in percentage by weight: 0.06%≤C≤0.18%, 0.01%≤Ni≤0.6%, 0.001%≤Cu≤2%, 0.001%≤Cr≤2%, 0.001%≤Si≤0.8%, 0%≤N≤0.008%, 0%≤P≤0.03%, 0%≤S≤0.03%, 0.001%≤Mo≤0.5%, 0.001%≤Nb≤0.1%, 0.001%≤V≤0.5%, 0.001%≤Ti≤0.1% and one or more following optional elements 0.2%≤Mn≤2%, 0.005%≤Al≤0.1%, 0%≤B≤0.003%, 0%≤Ca≤0.01%, 0%≤Mg≤0.010% the remainder composition being composed of iron and unavoidable impurities caused by processing, such product having a tertiary scale layer including, in area fraction, a total amount of at least 50% of magnetite and ferrite wherein ferrite is at least 25%, 0% to 50% of wustite, and 0% to 10% of hematite, such scale layer having a thickness between 5 microns and 40 microns.