Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2022/186270
Kind Code:
A1
Abstract:
A hot-rolled steel sheet which: comprises a steel sheet and a scale layer formed on the surface of the steel sheet, the steel sheet having a chemical composition comprising, by mass%, 0.05 to 0.20% of C, 0.005 to 0.30% of Si, 0.05 to 1.20% of Mn, 0.001 to 0.010% of P, 0.010% or less of S, 0.05 to 0.25% of Sn, 0.001 to 0.010% of N, 0.001 to 0.040% of Al, 0 to 0.30% of Cu, 0 to 0.15% of Ni, 0 to 0.30% of W, 0 to 0.30% of Mo, 0 to 0.20% of Cr, 0 to 0.020% of V, 0 to 0.020% of Ti, 0 to 0.025% of Nb, and the balance Fe and impurities; satisfies [0.50 < 4.6 x C + 1.5 x Si - 1.2 x Sn + 0.5 x (Cu + Ni + W + Mo) - 0.2 x (Cr + V + Ti + Nb) < 1.10]; has a magnetite volume fraction of 60% or more in the scale layer; and has an Sn-concentrated layer having an Sn content of 0.01 to 0.85% in the scale layer on the interface side with the steel sheet.
More Like This:
Inventors:
SUGAE KIYONOBU (JP)
OOHARA KAZUMI (JP)
OOHARA KAZUMI (JP)
Application Number:
PCT/JP2022/008845
Publication Date:
September 09, 2022
Filing Date:
March 02, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/50; C21D9/46
Domestic Patent References:
| WO2017183133A1 | 2017-10-26 |
Foreign References:
| JP2019157207A | 2019-09-19 | |||
| JP2016199778A | 2016-12-01 | |||
| JPH07138702A | 1995-05-30 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
Download PDF: