Steel for induction hardening

Abstract

This steel for induction hardening includes: in terms of mass %, C: 0.40% or more to 0.75% or less; Si: 0.002% or more to 3.0% or less; Mn: 0.20% or more to 2.0% or less; S: 0.002% or more to 0.1% or less; Al: more than 0.10% to 3.0% or less; P: 0.030% or less; and N: 0.035% or less, with the remainder being Fe and inevitable impurities.

1 . A steel for induction hardening comprising: in terms of mass %,
 C: 0.40% or more to 0.75% or less;   Si: 0.002% or more to 3.0% or less;   Mn: 0.20% or more to 2.0% or less;   S: 0.002% or more to 0.1% or less;   Al: more than 0.10% to 3.0% or less;   P: 0.030% or less; and   N: 0.035% or less,   with the remainder being Fe and inevitable impurities.   
     
     
         2 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, B: 0.0004% or more to 0.005% or less. 
     
     
         3 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, Ti: 0.004% or more to 0.10% or less. 
     
     
         4 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, either one or both of:
 Cr: 0.05% or more to 1.50% or less; and   Mo: 0.05% or more to 0.6% or less.   
     
     
         5 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, either one or both of:
 Nb: 0.005% or more to 0.2% or less; and   V: 0.01% or more to 1.0% or less.   
     
     
         6 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, one or more elements selected from the group consisting of:
 Sb: 0.0005% or more to 0.0150% or less;   Sn: 0.005% or more to 2.0% or less;   Zn: 0.0005% or more to 0.5% or less;   Te: 0.0003% or more to 0.2% or less;   Bi: 0.005% or more to 0.5% or less; and   Pb: 0.005% or more to 0.5% or less.   
     
     
         7 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, one or two or more elements selected from the group consisting of:
 Mg: 0.0002% or more to 0.003% or less;   Ca: 0.0003% or more to 0.003% or less;   Zr: 0.0003% or more to 0.005% or less; and   REM: 0.0003% or more to 0.005% or less.   
     
     
         8 . The steel for induction hardening according to  claim 1 , which further comprises, in terms of mass %, either one or both of:
 Ni: 0.05% or more to 2.0% or less; and   Cu: 0.01% or more to 2.0% or less.