Patent ID: 7935303
Filing Date: 2011-05-03
Classification: C21C,C22C

Abstract:
1. A low alloy steel, consisting of, in terms of mass %, C: 0.05 to 0.15%, Si: 0.15 to 0.70%, Mn: 1.50% or less, P: 0.020% or less, S: 0.010% or less, Cr: 0.8 to 2.5%, Mo: 0.01 to 1.00%, Nd: 0.001 to 0.100%, sol. Al: 0.02 0 % or less, N: 0.015% or less and O (oxygen): 0.0050% or less, the balance being Fe and impurities, wherein a metal structure thereof consists essentially of bainite and a ferrite ratio of 5% or less, and wherein inclusions containing Nd are formed therein in the range of from 0.1 μm to 10 μm in terms of size; and wherein the number of inclusions per 1000 μm 2 ranges from 10 to 1000.