Patent ID: 8221899
Filing Date: 2012-07-17
Classification: B23K,C21D,C22C,Y10T

Abstract:
1. A steel material, comprising Fe and: C: 0.01 to 0.30 mass %; Si: 0.1 to 3.00 mass %; Mn: 0.1 to 3.00 mass %; P: 0 to 0.10 mass %; S: 0 to 0.05 mass %; and N: 0 to 300 ppm, wherein a ratio of an oxide present in a grain boundary and an oxide present in grains comprising Mn and Si at a total amount of 1 at % or more, as oxides present in a steel region at a depth from a steel body surface of the steel material to 20 μm, is 5% or more and less than 20% as an average area ratio occupied in the steel region,