STEEL ALLOY, A HOLDER OR A HOLDER DETAIL FOR A PLASTIC MOULDING TOOL, A TOUGH HARDENED BLANK FOR A HOLDER OR HOLDER DETAIL, A PROCESS FOR PRODUCING A STEEL ALLOY
A steel alloy is described that, in weight-%, includes 0.08-0.19 C, where 0.16≦C+N≦0.28, 0.1-1.5 Si, 0.1-2.0 Mn, 13.0-15.4 Cr, 0.01-1.8 Ni, 0.01-1.3 Mo, max. 0.7 V, max. 0.25 S, max. 0.01 Ca, max. 0.01 O, in order to improve the machinability of the steel, and balance iron and unavoidable impurities, wherein the steel alloy has a microstructure which, in a tough hardened condition, comprises a martensitic matrix with up to 30 vol-% ferrite.
1 . A steel alloy comprising, in weight-%:
0.08-0.19 C,
0.16≦C+N≦0.28,
0.1-1.5 Si,
0.1-2.0 Mn,
13.0-15.4 Cr,
0.01-1.8 Ni,
0.01-1.3 Mo,
max. 0.7 V,
max. 0.25 S,
max. 0.01 Ca,
max. 0.0 O, in order to improve the machinability of the steel, and
balance iron and unavoidable impurities,
wherein the steel alloy has a microstructure which, in a tough hardened condition, comprises a martensitic matrix comprising up to 30 vol-% ferrite
2 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.09<C≦0.15.
3 . (canceled)
4 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.05-0.20 N.
5 . The steel alloy according to claim 4 , wherein the steel alloy comprises more than 0.08 N and max 0.13 N.
6 - 7 . (canceled)
8 . The steel alloy according to any of claim 1 , wherein the total amount of C+N satisfies the condition 0.17<C+N≦0.25.
9 . (canceled)
10 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.6<Si≦1.2.
11 - 12 . (canceled)
13 . The steel alloy according to claim 1 , wherein the steel alloy comprises 1.30-1.65 Mn.
14 - 17 . (canceled)
18 . The steel alloy according to claim 1 , wherein the steel alloy comprises 13.5-14.5 Cr.
19 - 22 . (canceled)
23 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.20-0.50 Ni.
24 . (canceled)
25 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.15-0.25 Mo.
26 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.05-0.7 V.
27 - 30 . (canceled)
31 . The steel alloy according to claim 1 , wherein the steel alloy comprises 0.10-0.15 S.
32 . (canceled)
33 . The steel alloy according to claim 1 , comprising:
0.09<C≦0.15,
0.08<N≦0.14,
wherein 0.17≦C+N≦0.25,
0.6-1.2 Si,
0.85-1.8 Mn,
13.5-14.8 Cr,
0.10-0.40 Mo,
0.1-0.55 Ni, and
0.05<V≦0.20,
wherein the steel alloy comprises a martensitic matrix, in a tough hardened condition, which contains up to 15 vol-% ferrite.
34 . The steel alloy according to claim 1 , comprising:
0.10-0.15 C,
0.08<N≦0.13,
wherein 0.8≦C+N≦0.25,
0.75-1.20 Si,
1.30-1.65 Mn,
13.6-14.5 Cr,
0.15-0.25 Mo,
0.30-0.55 Ni, and
0.05<V<0.15,
wherein the steel alloy comprises a martensitic matrix, in a tough hardened condition, comprising up to 10 vol-% ferrite.
35 - 38 . (canceled)
39 . The steel alloy according to claim 1 , wherein the matrix comprises 0.05-6.5 vol-% ferrite.
40 . A process for producing at least one selected from a group comprising a holder base, a holder detail base, a molding tool base for a holder, a holder detail for a plastic moulding tool, and a molding tool, the process comprising:
manufacturing a steel alloy comprising, in weight-%
0.08-0.19 C,
0.16≦C+N≦0.28,
0.1-1.5 Si,
0.1-2.0 Mn,
13.0-15.4 Cr,
0.01-1.8 Ni,
0.01-1.3 Mo,
max. 0.7 V,
max. 0.25 S,
max. 0.01 Ca,
max. 0.01 O, wherein the O, S, and Ca improve the machinability of the steel, and
balance iron and unavoidable impurities,
hot working an ingot of the steel alloy at a temperature range of 1100-1300° C.,
cooling the steel alloy, thereby hardening the steel alloy,
tempering the steel alloy twice for 2 hours at a temperature of 510-650° C., thereby obtaining a tough hardened blank having a martensitic matrix containing up to 30 vol-% ferrite.
41 . A process for producing at least one selected from a group comprising a holder base, a holder detail base, a molding tool base for a holder, a holder detail for a plastic moulding tool, and a molding tool, the process comprising:
manufacturing a steel alloy with a chemical composition according to comprising, in weight-%
0.08-0.19 C.
0.16≦C+N≦0.28,
0.1-1.5 Si,
0.1-2.0 Mn,
13.0-15.4 Cr,
0.01-1.8 Ni,
0.01-1.3 Mo,
max. 0.7 V,
max. 0.25 S,
max. 0.01 Ca,
max. 0.01 O, wherein the O, S, and Ca improve the machinability of the steel, and
balance iron and unavoidable impurities,
hot working an ingot of the steel alloy at a temperature range of 1100-1300° C.,
cooling the steel alloy to an isothermal annealing temperature of 550-700° C., and
subjecting the steel alloy to the isothermal annealing at the isothermal annealing temperature for 5-10 h.
42 . The process of claim 40 , wherein the steel alloy is produced, using scrap as a raw material, by melting the scrap in a furnace.
43 - 47 . (canceled)
48 . The process of claim 41 , wherein the steel alloy is produced, using scrap as a raw material, by melting the scrap in a furnace.
49 . The process of claim 41 , further comprising:
hardening the steel alloy by austenitizing at a temperature of 900-1100° C. for 30 min, and
tempering the steel alloy twice for 2 hours at a temperature of 510-650° C.,
thereby obtaining a tough hardened blank having a martensitic matrix containing up to 30 vol-% ferrite.