Invention Grant
- Patent Title: Hot press formed parts having excellent powdering resistance during hot press forming
-
Application No.: US15250120Application Date: 2016-08-29
-
Publication No.: US09963758B2Publication Date: 2018-05-08
- Inventor: Il-Ryoung Sohn , Dae-Chul Bae , Heung-Yun Kim
- Applicant: POSCO
- Applicant Address: KR Pohang-si
- Assignee: POSCO
- Current Assignee: POSCO
- Current Assignee Address: KR Pohang-si
- Agency: Cantor Colburn LLP
- Priority: KR10-2014-0189096 20141224
- Main IPC: C23C2/40
- IPC: C23C2/40 ; C23C2/28 ; C23C2/12 ; C22C38/32 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C22C38/28 ; B32B15/01 ; C21D9/46 ; C21D8/02 ; C22F1/043

Abstract:
Provided is a hot press-formed (HPF) member with excellent powdering resistance at the time of press forming. The HPF member includes a hot-dip coating layer containing Al on a surface of a base steel sheet. The base steel sheet includes, based on wt %, 0.18-0.25% of C, 0.1-1.0% of Si, 0.9-1.5% of Mn, 0.03% or less of P, 0.01% or less of S, 0.01-0.05% of Al, 0.05-0.5% of Cr, 0.01-0.05% of Ti, 0.001-0.005% of B, 0.009% or less of N, the balance Fe, and the other impurities. The hot-dip coating layer comprises a soft diffusion layer and a hard alloy layer. The alloy layer has a Tau phase in the range of 10-30%, in terms of area percent.
Public/Granted literature
Information query
IPC分类: