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1. (WO2017069161) HOT-ROLLED STEEL AND STEEL PART

Pub. No.:    WO/2017/069161    International Application No.:    PCT/JP2016/080984
Publication Date: Fri Apr 28 01:59:59 CEST 2017 International Filing Date: Thu Oct 20 01:59:59 CEST 2016
IPC: C22C 38/00
C22C 38/60
C21D 8/00
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: YOSHIDA Suguru
吉田 卓
TERAMOTO Shinya
寺本 真也
SHIGA Akira
志賀 聡
KUBOTA Manabu
久保田 学
HASEGAWA Hajime
長谷川 一
MIZUKAMI Hideo
水上 英夫
Title: HOT-ROLLED STEEL AND STEEL PART
Abstract:
Hot-rolled steel according to an embodiment of the present invention has a prescribed chemical composition that includes 0.0001–0.0050 mass% of Bi; at least 90% by area of the metal structure consists of ferrite and pearlite; and the average number density of manganese sulfides, as measured at a cross-section parallel to the rolling direction, having an equivalent circle diameter of 1–5 μm and having an aspect ratio stretched along the rolling direction of more than 10 but less than or equal to 30 is 50–200/mm2.