CPC C21D 9/46 (2013.01) [B21B 3/02 (2013.01); B21D 22/022 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/0205 (2013.01); C21D 8/0226 (2013.01); C21D 8/0236 (2013.01); C21D 8/0247 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C21D 2211/003 (2013.01); C21D 2211/005 (2013.01)] | 18 Claims |
1. A hot-formed member, comprising:
a base member comprising C: 0.1 to 0.4%, Si: 0.5 to 2.0%, Mn: 0.01 to 4.0%, Al: 0.001 to 0.4%, P: 0.001 to 0.05%, S: 0.0001 to 0.02%, Cr: 0.5% or higher and less than 3.0%, N: 0.001 to 0.02%, and a balance of Fe and inevitable impurities by weight %,
wherein the base member satisfies equation (1) below:
1.4≤0.4*Cr+Si≤3.2 equation (1):
where each element symbol is a value of a content of each element measured by weight %; and
wherein an Si-based amorphous oxide layer having a thickness of 2 nm to 2000 nm is continuously or discontinuously formed on a surface of the base member.
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