Japan, March 5 -- NIPPON STEEL CORP has got intellectual property rights for 'STEEL MATERIAL.' Other related details are as follows:
Application Number: JP,2022-135423
Category (FI): C21D9/30@A,C22C38/00,301@M,C22C38/00,301@A,C21C7/10@A,C21C7/06,C22C38/06,C22C38/60,C21D8/06@A
Stage: PROBLEM TO BE SOLVED: To provide a steel material excellent in machinability, capable of preventing a fusion crack at high frequency induction hardening, and having an excellent fatigue strength when used as a component for machine structure.SOLUTION: A steel material includes, by mass%, over 0.30 to 0.60% C, 0.01 to 0.55% Si, 0.50 to 1.65% Mn, 0.050% or less P, 0.010 to 0.200% S, 0.0001 to 0.0050% Bi, 0.0001 to 0.0050% Ca, 0.001 to 0.005% Al, 0.0030 to 0.0250% N, and 0.0030% or less O, and satisfies an expression (1) in a specification. In the steel material, a number density of fine sulfide is 20/mm2 or more, a number density of coarse Bi particles is 2.00/mm2, and a number density of a specific oxide is 0.1/mm2 or more.SELECTED DRAWING: Figure 3 (Grant)
Filing Date: Aug. 26, 2022
Publication Date: March 7, 2024
The original document can be viewed at: https://www.j-platpat.inpit.go.jp/p0100
Disclaimer: Curated by HT Syndication.
