| abstract |
Provided is a steel material for a component that is subjected to a carburizing process to obtain excellent fatigue strength even when a component is manufactured by welding before the carburizing process. The steel material of the present disclosure is, by mass%, C: 0.09 to 0.16%, Si: 0.01 to 0.50%, Mn: 0.40 to 0.60%, P: 0.030% or less. , S: 0.025% or less, Cr: 0.90-2.00%, Mo: 0.10-0.40%, Al: 0.005-0.030%, Ti: 0.010-0. Less than 050%, Nb: 0.010-0.030%, N: 0.0080% or less, O: 0.0030% or less, B: 0.0003-0.0030%, Ca: 0.0005-0. 0050% and the balance: Fe and impurities, having a chemical composition satisfying the formulas (1) to (3) described in the specification. In a cross section parallel to the axial direction of the steel material, Mn sulfide is 70.0 / mm 2 or less and oxide is 25.0 / mm 2 or less. |