Title:
穴拡げ性に優れた高強度熱延鋼板及びその製造方法
Document Type and Number:
Japanese Patent JP7216356
Kind Code:
B2
Abstract:
A high strength hot-rolled steel sheet having an excellent hole expansion ratio according to an aspect of the present invention comprises, by weight %, 0.12% or more and less than 0.30% of carbon (C), 0.1-2.5% of manganese (Mn), 0.5% or less of silicon (Si) (not including 0%), 0.0005-0.005% of boron (B), 0.02% or less of phosphorus (P), 0.01% or less of sulfur (S), and the balance being iron (Fe) and unavoidable impurities, and comprises 95 volume% or more of martensite as a microstructure. And the product of the tensile strength (TS) and hole expansion ratio (HER) can be 30,000MPa% or greater.
Inventors:
Park, Kyung-su
Application Number:
JP2021534941A
Publication Date:
February 01, 2023
Filing Date:
December 18, 2019
Export Citation:
Assignee:
POSCO Holdings Inc.
International Classes:
C22C38/00; C22C38/38
Domestic Patent References:
| JP2017057472A | ||||
| JP2003105446A | ||||
| JP2018518596A |
Foreign References:
| KR1020130110646A | ||||
| KR1020150014736A | ||||
| WO2018117552A1 |
Attorney, Agent or Firm:
Hidekazu Miyoshi
Masakazu Ito
Yuko Hara
Masakazu Ito
Yuko Hara