Hot press formed article having good anti-delamination, and preparation method for same
AssigneePosco
InventorHeung-Yun Kim
Life of this patent
Estimating the term…
Abstract
Provided is a hot press formed article having good anti-delamination and having a hot dip aluminized layer formed on the surface of a base steel sheet. The base steel sheet comprises 0.18-0.25 wt % of C, 0.1-0.5 wt % of Si, 0.9-1.5 wt % of Mn, 0.03 wt % or less of P, 0.01 wt % or less of S, 0.01-0.05 wt % of Al, 0.05-0.5 wt % of Cr, 0.01-0.05 wt % of Ti, 0.001-0.005 wt % of B, 0.009 wt % or less of N and the balance of Fe and other impurities. The aluminized layer comprises a single soft diffusion layer comprising α-Fe with solid-solubilized Al, and the hardness of the diffusion layer is 300-600 (Hv).
Claims5
A hot press formed (HPF) article having an improved delamination resistance, the HPF article comprising:
- a base steel sheet comprising:
- carbon (C):
- 0.18 wt % to 0.25 wt %, silicon (Si):
- 0.1 wt % to 0.5 wt %, manganese (Mn):
- 0.9 wt % to 1.5 wt %, phosphorous (P):
- 0.03 wt % or less, sulfur (S):
- 0.01 wt % or less, aluminum (Al):
- 0.01 wt % to 0.05 wt %, chromium (Cr):
- 0.05 wt % to 0.5 wt %, titanium (Ti):
- 0.01 wt % to 0.05 wt %, boron (B):
- 0.001 wt % to 0.005 wt %, nitrogen (N):
- 0.009 wt % or less, a balance of iron (Fe) and other impurities;
- and
- an aluminum plated layer formed on a surface of the base steel sheet,
- wherein the aluminum plated layer comprises:
- only a single soft diffusion layer comprising α-Fe and aluminum (Al) solid-solubilized in the α-Fe;
- and
- the single soft diffusion layer has a hardness of 300 (Hv) to 600 (Hv).
Dependencies are inferred from the claim text.