Title:
NON-QUENCHED AND TEMPERED STEEL WIRE ROD WITH IMPROVED MACHINABILITY AND TOUGHNESS, AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/234700
Kind Code:
A1
Abstract:
The present invention pertains to a non-quenched and tempered steel wire rod with improved machinability and toughness, and a method for manufacturing same. This non-quenched and tempered steel wire rod contains, in mass%, 0.3-0.5% of C, 0.4-0.9% of Si, 0.5-1.2% of Mn, 0.02% or less of P, 0.01-0.05% of S, 0.015-0.05% of sol. Al, 0.1%-0.3% of Cr, and 0.007%-0.02% of N, with the remainder comprising Fe and inevitable impurities, has a microstructure in which the average thickness of the pearlite layer in the L cross section, which is the cross section parallel to the rolling direction, is 30 μm or less and the average grain size of ferrite is 20 μm or less, and satisfies the following expressions: [Expression 1] 20 ≤ Mn/S ≤ 70; [Expression 2] 1.4 ≤ Al/N ≤ 7; [Expression 3] 0.7 ≤ Mn + Cr ≤ 1.4; [Expression 4] 0.2 ≤ C/Mn ≤ 0.7; and [Expression 5] 0 ≤ Mnc/Mnf ≤ 3.
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Inventors:
LIM NAMSUK (KR)
MUN DONGJUN (KR)
KIM HANHWI (KR)
MUN DONGJUN (KR)
KIM HANHWI (KR)
Application Number:
PCT/KR2023/007440
Publication Date:
December 07, 2023
Filing Date:
May 31, 2023
Export Citation:
Assignee:
POSCO CO LTD (KR)
International Classes:
C22C38/18; B21B1/16; C21D8/06; C21D9/52; C22C38/00
Foreign References:
| KR20210077530A | 2021-06-25 | |||
| KR20200062439A | 2020-06-04 | |||
| KR102175586B1 | 2020-11-06 | |||
| JP2004137542A | 2004-05-13 | |||
| KR102178711B1 | 2020-11-13 |
Attorney, Agent or Firm:
SELIM INTELLECTUAL PROPERTY LAW FIRM (KR)
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