Steel for induction hardening roughly shaped material for induction hardening
View Patent ↗A steel for an induction hardening including, by mass %, C: more than 0.75% to 1.20%, Si: 0.002 to 3.00%, Mn: 0.20 to 2.00%, S: 0.002 to 0.100%, Al: more than 0.050% to 3.00%. P: limited to 0.050% or less, N: limited to 0.0200% or less, O: limited to: 0.0030% or less, and the balance composing of iron and unavoidable impurities, wherein an Al content and a N content satisfy, by mass %, Al−(27/14)×N>0.050%.
1. A steel for an induction hardening comprising, by mass %,
C: more than 0.75% to 1.20%,
Si: 0.002% to 3.00%,
Mn: 0.20% to 2.00%,
S: 0.002% to 0.100%,
Al: more than 0.050% to 3.00%,
P: limited to 0.050% or less,
N: limited to 0.0200% or less,
O: limited to 0.0030% or less,
B: 0% to 0.0050%,
Cr: 0% to less than 0.30%,
Mo: 0% to 1.00%,
Cu: 0% to 1.00%, and
Ni: 0% to 2.00%, and
the balance comprising iron and unavoidable impurities,
wherein an Al content and a N content, by mass %, satisfy Al−(27/14)×N>0.050%, and
a graphitization value CE, which is defined as the following equation (1), is controlled to 1.28 or less:
CE =C+Si/3−Mn/12+Al/6+Cu/9+Ni/9−Cr/9−Mo/9+B. . . , (1)
wherein the C, Si, Mn, Al, Cu, Ni, Cr, Mo, and B in the equation (1) indicate mass % of each element that is included in the steel for the induction hardening.
2. The steel for the induction hardening according to claim 1 , comprising, by mass %,
B: 0.0005% to 0.0050%.
3. The steel for the induction hardening according to claim 1 , comprising at least one of, by mass %,
Cr: 0.05% to less than 0.30%,
Mo: 0.01% to 1.00%,
Cu: 0.05% to 1.00%, or
Ni: 0.05% to 2.00%.
4. The steel for the induction hardening according to claim 1 , further comprising at least one of, by mass %,
Ca: 0.0005% to 0.0030%,
Zr: 0.0005% to 0.0030%, or
Mg: 0.0005% to 0.0030%.
5. The steel for the induction hardening according to claim 2 , comprising at least one of, by mass %,
Cr: 0.05% to less than 0.30%,
Mo: 0.01% to 1.00%,
Cu: 0.05% to 1.00%, or
Ni: 0.05% to 2.00%.
6. The steel for the induction hardening according to claim 2 , further comprising at least one of, by mass %,
Ca: 0.0005% to 0.0030%,
Zr: 0.0005% to 0.0030%, or
Mg: 0.0005% to 0.0030%.
7. The steel for the induction hardening according to claim 3 , further comprising at least one of, by mass %,
Ca: 0.0005% to 0.0030%,
Zr: 0.0005% to 0.0030%, or
Mg: 0.0005% to 0.0030%.
8. The steel for the induction hardening according to claim 5 , further comprising at least one of, by mass %,
Ca: 0.0005% to 0.0030%,
Zr: 0.0005% to 0.0030%, or
Mg: 0.0005% to 0.0030%.
9. The steel for the induction hardening according to claim 1 , comprising, by mass %,
Si: 0.002% to less than 0.50%.
10. The steel for the induction hardening according to claim 1 , comprising, by mass %,
O: 0.0001% to 0.0030%.
11. The steel for the induction hardening according to claim 9 , comprising, by mass %,
O: 0.0001% to 0.0030%.
12. The steel for the induction hardening according to claim 1 , further comprising, by mass %,
at least one of,
V: 0.005% to less than 0.20%,
Nb: 0.005% to 0.10%, or
Ti: 0.005% to 0.10%.
13. The steel for the induction hardening according to claim 12 , comprising, by mass %,
B: 0.0005% to 0.0050%.
14. The steel for the induction hardening according to claim 12 , comprising at least one of, by mass %,
Cr: 0.05% to less than 0.30%,
Mo: 0.01% to 1.00%,
Cu: 0.05% to 1.00%, or
Ni: 0.05% to 2.00%.
15. The steel for the induction hardening according to claim 12 , further comprising at least one of, by mass %,
Ca: 0.0005% to 0.0030%,
Zr: 0.0005% to 0.0030%, or
Mg: 0.0005% to 0.0030%.