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1. IN4852/KOLNP/2011 - HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME

Office India
Application Number 4852/KOLNP/2011
Application Date 25.11.2011
Publication Number 4852/KOLNP/2011
Publication Date 26.08.2016
Grant Number 289350
Grant Date 10.11.2017
Publication Kind B
IPC
C22C 38/00
CCHEMISTRY; METALLURGY
22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
CALLOYS
38Ferrous alloys, e.g. steel alloys
Applicants JFE STEEL CORPORATION
Inventors KOICHI NAKAGAWA
TAKESHI YOKOTO
KAZUHIRO SETO
SATOSHI KINOSHIRO
YUJI TANAKA
KATSUMI YAMADA
TETSUYA MEGA
KETSUMI NAKAJIMA
Title
(EN) HIGH STRENGTH STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
Abstract
(EN)
Provided are a high-strength steel sheet havingexcellent stretch flangeability after working and a methodfor producing such a high-strength steel sheet. Thecomposition contains, in mass percent, 0.08% to 0.20% ofcarbon, 0.2% to 1.0% of silicon, 0.5% to 2.5% of manganese,0.04% or less of phosphorus, 0.005% or less of sulfur, 0.05%or less of aluminum, 0.07% to 0.20% of titanium, and 0.20%to 0.80% of vanadium, the balance being iron and incidentalimpurities. In addition, the structure includes 80% to 98%by volume of a ferrite phase and a second phase.Furthermore, the sum of the amounts of titanium and vanadiumcontained in precipitates having a size of less than 20 nmis 0.150% by mass or more. The difference (HVα - HVS)between the hardness of the ferrite phase (HVα) and thehardness of a second phase (HVS) is -300 to 300.