Patent ID: 9297051
Filing Date: 2016-03-29
CPC Classification: C21D,C22C,C23C

Claim Text:
1. A steel comprising, in mass %: C: 0.05-0.20%; Si: 0.01-0.1%; Mn: 0.3-0.6%; P: 0.03% or less, excluding 0%; S: 0.001-0.02%; Cr: 1.2-2.0%; Al: 0.01-0.1%; Ti: 0.010-0.10%; N: 0.010% or less, excluding 0%; and B: 0.0005-0.005%, with a balance comprising iron and unavoidable impurities, wherein a density of Ti-based precipitates having a circle-equivalent diameter of less than 20 nm is 10-100 pieces/μm a density of Ti-based precipitates having a circle-equivalent diameter of 20 nm or more is 1.5-10 pieces/μm a Vickers hardness is 130 HV or less.