Steel

Abstract

According to an aspect of the present invention, there is provided a steel containing, by unit mass %, C: 0.08% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.50% to 3.00%, P: 0.040% or less, S: 0.020% or less, V: 0.010% or less, Ti: 0.010% or less, Nb: 0.005% or less, Cr: 1.00% to 2.50%, Cu: 0.01% to 0.50%, Ni: 0.75% to 1.60%, Mo: 0.10% to 0.50%, Al: 0.025% to 0.050%, N: 0.0100% to 0.0200%, Ca: 0% to 0.0100%, Zr: 0% to 0.0100%, Mg: 0% to 0.0100%, and a remainder including Fe and impurities, in which a ratio of an Al content to a N content is 2.6 or less, a ratio of a Mn content to a Ni content is 1.5 or more and 3.0 or less.

1 . A steel comprising, by unit mass %,
 C: 0.08% to 0.12%;   Si: 0.05% to 0.50%;   Mn: 1.50% to 3.00%;   P: 0.040% or less;   S: 0.020% or less;   V: 0.010% or less;   Ti: 0.010% or less;   Nb: 0.005% or less;   Cr: 1.00% to 2.50%;   Cu: 0.01% to 0.50%;   Ni: 0.75% to 1.60%;   Mo: 0.10% to 0.50%;   Al: 0.025% to 0.050%;   N: 0.0100% to 0.0200%;   Ca: 0% to 0.0100%;   Zr: 0% to 0.0100%;   Mg: 0% to 0.0100%; and   a remainder including Fe and impurities,   wherein a Y value defined by Equation (a) is 2.6 or less, and   a Z value defined by Equation (b) is 1.5 or more and 3.0 or less,
   Y=(Al)/(N)  (a)
 
   Z=(Mn)/(Ni)  (b)
 
   symbols (Al), (N), (Mn), and (Ni) in the equations represent amounts of elements relating to the respective symbols in the steel, by unit mass %.   
     
     
         2 . The steel according to  claim 1  comprising, by unit mass %, one or more selected from the group consisting of
 Ca: 0.0005% to 0.0100%; 
 Zr: 0.0005% to 0.0100%; and 
 Mg: 0.0005% to 0.0100%.