FIELD: metallurgy.
SUBSTANCE: invention relates to metallurgy, namely, to cold-rolled coated steel sheets suitable for use in automobiles. Cold-rolled coated steel sheet has a composition including the following elements, wt.%: 0.12≤carbon≤0.2, 1.7≤manganese≤2.10, 0.1≤silicon≤0.5, 0.1≤aluminium≤0.8, 0.1≤chromium≤0.5, 0≤phosphorus≤0.09, 0≤sulphur≤0.09, 0≤nitrogen≤0.09, and optionally contains one or several of the following elements: nickel≤3, niobium≤0.1, titanium≤0.1, calcium≤0.005, copper≤2, molybdenum≤0.5, vanadium≤0.1, boron≤0.003, cerium≤0.1, magnesium≤0.010, zirconium≤0.010, the rest of the composition being iron and inevitable impurities. The microstructure of the sheet contains, in percentages area, 15 to 60% bainite, 25 to 55% ferrite, 5 to 15% residual austenite, wherein the content of carbon in the residual austenite is between 0.7 and 1%, and 5 to 18% martensite, wherein the total amount of bainite and ferrite is at least 70%.
EFFECT: sheet is characterised by high values of strength and elongation, making it suitable for moulding and rolling while providing good weldability.
29 cl, 4 tbl, 11 ex
Title |
Year |
Author |
Number |
HEAT-TREATED COLD-ROLLED STEEL SHEET AND METHOD OF MANUFACTURING THEREOF |
2020 |
|
RU2824080C1 |
COLD-ROLLED AND COATED STEEL SHEET AND METHOD FOR ITS PRODUCTION |
2020 |
- Jun, Hyun Jo
- Pottore, Narayan
- Fan, Dongwei
- Chen, Xiang
- Yakubovsky, Oleg
|
RU2795439C1 |
COLD-ROLLED STEEL SHEET WITH COATING AND METHOD OF ITS MANUFACTURING |
2020 |
- Pachon Rodriguez, Edgar, Alejandro
- Blesse, Virginie
- Serra, Doriane
|
RU2831670C1 |
COLD-ROLLED COATED STEEL SHEET AND METHOD FOR PRODUCTION THEREOF |
2019 |
|
RU2778467C1 |
HEAT-TREATED COLD-ROLLED STEEL SHEET AND METHOD OF ITS MANUFACTURING |
2020 |
- Lhoist, Vincent
- Hebert, Veronique
- Siebentritt, Matthieu
|
RU2832021C1 |
COLD-ROLLED MARTENSITIC STEEL AND METHOD FOR PRODUCING THE SPECIFIED STEEL |
2020 |
- Siebentritt, Matthieu
- Lhoist, Vincent
|
RU2802417C2 |
COLD-ROLLED AND HEAT-TREATED STEEL SHEET AND METHOD OF MANUFACTURING THEREOF |
2020 |
- Hoffmann, Etienne
- Hebert, Veronique
|
RU2829770C1 |
COLD-ROLLED MARTENSITIC STEEL AND METHOD FOR PRODUCING MARTENSITIC STEEL |
2020 |
- Zibentrit, Mate
- Luast, Vensan
- Esno, Oreli
|
RU2785760C1 |
THERMALLY TREATED COLD-ROLLED STEEL SHEET AND METHOD OF ITS MANUFACTURING |
2020 |
- Siebentritt, Matthieu
- Lamouche, Julien
- De Knijf, Dorien
|
RU2832040C1 |
COLD-ROLLED AND ANNEALED STEEL SHEET AND PRODUCTION METHOD |
2019 |
|
RU2803955C1 |