Steel material for hardening
View Patent ↗The present invention provides a steel material for hardening, including chemical components, by mass %, of: C: 0.15 to 0.60%; Si: 0.01 to 1.5%; Mn: 0.05 to 2.5%; P: 0.005 to 0.20%; S: 0.001 to 0.35%; Al: over 0.06 to 0.3%; and total N: 0.006 to 0.03%, with a balance including Fe and inevitable impurities including B of not more than 0.0004%, in which a hardness R at a position 5 mm away from a quenching end measured through a Jominy-type end-quenching method specified in JIS G 0561, and a calculation hardness H at a position 4.763 mm away from the quenching end satisfy the following Equation (1). H ×0.948≦ R≦H ×1.05 Equation (1)
1. A steel material for hardening, including chemical components, by mass %, of:
C: 0.15 to 0.60%;
Si: 0.01 to 1.5%;
Mn: 0.05 to 2.5%;
P: 0.005 to 0.20%;
S: 0.001 to 0.35%;
Al: over 0.06 to 0.3%; and
total N: 0.006 to 0.03%,
with a balance including Fe and inevitable impurities including B of not more than 0.0004%, wherein
R and H satisfy following Equation (1), where the R is a hardness at a position 5 mm away from a quenching end measured through a Jominy end-quenching method specified in JIS G 0561, and the H is a calculation hardness at a position 4.763 mm away from the quenching end
H× 0.948≦R≦H×1.05 Equation (1).
2. The steel material for hardening according to claim 1 , wherein the chemical components further include, in mass %, one or more of:
Cr: 0.1 to 3.0%;
Mo: 0.01 to 1.5%;
Cu: 0.1 to 2.0%;
Ni: 0.1 to 5.0%;
Ca: 0.0002 to 0.005%;
Zr: 0.0003 to 0.005%;
Mg: 0.0003 to 0.005%;
REM: 0.0001 to 0.015%;
Nb: 0.01 to 0.1%;
V: 0.03 to 1.0%;
W: 0.01 to 1.0%;
Sb: 0.0005 to 0.0150%;
Sn: 0.005 to 2.0%;
Zn: 0.0005 to 0.5%;
Te: 0.0003 to 0.2%;
Bi: 0.005 to 0.5%; and
Pb: 0.005 to 0.5%.
3. The steel material for hardening according to claim 1 , wherein the chemical components further include, in mass %, Ti: 0.001 to 0.05%, wherein [total N] and [Ti] satisfy following Equation (2), where [total N] is total amount (%) of N, and [Ti] is amount (%) of Ti
0.006+[Ti]×(14/48)≦[total N]≦0.03 Equation (2)
4. The steel material for hardening according to claim 3 , wherein the chemical components further include, in mass %, one or more of:
Cr: 0.1 to 3.0%;
Mo: 0.01 to 1.5%;
Cu: 0.1 to 2.0%;
Ni: 0.1 to 5.0%;
Ca: 0.0002 to 0.005%;
Zr: 0.0003 to 0.005%;
Mg: 0.0003 to 0.005%;
REM: 0.0001 to 0.015%;
Nb: 0.01 to 0.1%;
V: 0.03 to 1.0%;
W: 0.01 to 1.0%;
Sb: 0.0005 to 0.0150%;
Sn: 0.005 to 2.0%;
Zn: 0.0005 to 0.5%;
Te: 0.0003 to 0.2%;
Bi: 0.005 to 0.5%; and
Pb: 0.005 to 0.5%.
5. A power-transmitting part obtained by subjecting the steel material for hardening according to any one of claims 1 to 4 to a machine work and hardening.