Title:
COLD FORGING WIRE ROD AND STEEL PART HAVING IMPROVED DELAYED FRACTURE RESISTANCE, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/101487
Kind Code:
A1
Abstract:
Disclosed are: a cold forging wire rod and a steel part in which the microstructure is controlled through the alloy composition and manufacturing method, thus enabling cost reduction and enhancing delayed fracture resistance; and a method for manufacturing same. The steel part having improved delayed fracture resistance according to an embodiment of the present invention contains, in weight percent, 0.18-0.25% of C, 0.30-0.50% of Si, 0.35-0.50% of Mn, more than 0% and no more than 0.03% of P, more than 0% and no more than 0.03% of S, 0.45-0.60% of Cr, 0.015-0.03% of Ti, and 0.001-0.004% of B, with the remainder comprising Fe and inevitable impurities, and may include at least 90% by volume of auto-tempered martensite.
Inventors:
CHUN YOUNGSOO (KR)
ROH JUNGPYO (KR)
KIM DANBI (KR)
KIM YOUNGTAE (KR)
ROH JUNGPYO (KR)
KIM DANBI (KR)
KIM YOUNGTAE (KR)
Application Number:
PCT/KR2022/019409
Publication Date:
June 08, 2023
Filing Date:
December 01, 2022
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/28; B21B1/16; B21C47/02; C21D1/18; C21D9/52; C22C38/32
Foreign References:
| KR101322534B1 | 2013-10-28 | |||
| KR20210078116A | 2021-06-28 | |||
| KR101225404B1 | 2013-01-22 | |||
| KR20140123111A | 2014-10-21 | |||
| JPH11236617A | 1999-08-31 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
Download PDF:
Previous Patent: INTEGRATED ECOLOGY TOXICITY MONITORING APPARATUS
Next Patent: APPARATUS AND METHOD FOR BIOMETRIC AUTHENTICATION
Next Patent: APPARATUS AND METHOD FOR BIOMETRIC AUTHENTICATION