Title:
高強度鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP7096337
Kind Code:
B2
Abstract:
A high strength steel sheet according to an aspect of the present invention comprises, by weight %, 0.05-0.20% of C, 0.15-0.55% of Si, 0.9-1.75% of Mn, 0.001-0.05% of Al, 0.03 % or less of P, 0.03% or less of S, 0.05-0.3% of Cr, 0.05-0.6% of Ni, 0.005-0.35% of Cu, 0.05-0.2% of Mo, 0.005-0.07% of V, 0.005-0.04% of Nb, 0.0005-0.005% of Ca, 0.005-0.025% of Ti, 0.002-0.006% of N, less than 0.0005% of B, the balance of Fe and inevitable impurities, with the proviso of satisfying the relation that Cu + Ni + Cr + Mo: 1.5% or less; Cr + Mo: 0.4% or less; V + Nb: 0.1% or less; and Ca/S: 1.0 or higher and may include a combined structure of tempered martensite and tempered bainite as a microstructure.
Inventors:
Hong, Sun Tech
Application Number:
JP2020535011A
Publication Date:
July 05, 2022
Filing Date:
November 28, 2018
Export Citation:
Assignee:
POSCO
International Classes:
C22C38/00; C21D8/02; C22C38/58
Domestic Patent References:
| JP2015124435A |
Foreign References:
| WO2016152172A1 | ||||
| WO2014041802A1 | ||||
| WO2010074473A2 |
Attorney, Agent or Firm:
Kyosei International Patent Office