Primary material for molds adapted to mold plastics
A mold material having a material hardness higher than 340 HB and a fine-grain structure. The mold material having a composition in weight percent that includes: C=0.25-0.35 Si=0.04-0.20 Mn=1.00-2.00 Cr=1.00-2.00 Ni=0.30-less than 0.90 Mo=0.30-0.80 V=less than/equal to 0.20 Al=0.01-0.03 N=0.0025-0.0150 S=less than 0.15 a remainder of Fe and impurities.
1. A primary material adapted for use in a mold for molding plastics, the material comprising, in a tempered state, a composition having a material hardness of higher than 340 HB and the composition consisting essentially of, in weight percent:
C=0.25 to 0.35
Si=0.04 to 0.20
Mn=1.00 to 2.00
Cr=1.00 to 2.00
Ni=0.30 to less than 0.90
Mo=0.30 to 0.80
V=less than/equal to 0.20
Al=0.01 to 0.03
N=0.0025 to 0.0150
S=less than 0.15
a remainder of Fe and impurities.
2. The primary material of claim 1 , wherein the material hardness is between 355 HB and 410 HB.
3. The primary material of claim 1 , wherein C is between 0.30 and 0.34 weight percent.
4. The primary material of claim 1 , wherein Ni is between 0.38 and 0.90 weight percent.
5. The primary material of claim 1 , wherein the composition satisfies the formula D=Mn+2Ni and has a value between 2.20 and 3.50.
6. The primary material of claim 1 , wherein Mo is between 0.40 and 0.70 weight percent.
7. The primary material of claim 1 , wherein V is between 0.015 and 0.18 weight percent.
8. The primary material of claim 1 , wherein N is between 0.005 and 0.01 weight percent.
9. The primary material of claim 1 , wherein S is than 0.01 weight percent.
10. The primary material of claim 1 , wherein the impurities are manufacturing-specific impurities.
11. A mold material adapted for molding plastics, the material comprising, in a tempered state, a composition having a material hardness of between 355 HB and 410 HB and the composition includes, in weight percent:
C=0.25 to 0.35
Si=0.04 to 0.20
Mn=1.00 to 2.00
Cr=1.00 to 2.00
Ni=0.30 to less than 0.90
Mo=0.30 to 0.80
V=less than/equal to 0.20
Al=0.01 to 0.03
N=0.0025 to 0.0150
S=less than 0.15
a remainder of Fe and impurities.
12. The material of claim 11 , wherein C is between 0.30 and 0.34 weight percent.
13. The material of claim 11 , wherein Ni is between 0.38 and 0.90 weight percent.
14. The material of claim 11 , wherein the composition satisfies the formula D=Mn+2Ni and has a value between 2.20 and 3.50.
15. The material of claim 11 , wherein Mo is between 0.40 and 0.70 weight percent.
16. The material of claim 11 , wherein V is between 0.015 and 0.18 weight percent.
17. The material of claim 11 , wherein N is between 0.005 and 0.01 weight percent.
18. The material of claim 11 , wherein S is than 0.01 weight percent.
19. A method making a mold adapted for molding plastics, the method comprising forming a material comprising, in a tempered state, a material hardness of between 355 HB and 410 HB and a composition including consisting essentially of, in weight percent:
C=0.25 to 0.35
Si=0.04 to 0.20
Mn=1.00 to 2.00
Cr=1.00 to 2.00
Ni=0.30 to less than 0.90
Mo=0.30 to 0.80
V=less than/equal to 0.20
Al=0.01 to 0.03
N=0.0025 to 0.0150
S=less than 0.15
a remainder of Fe and impurities.
20. A primary material adapted for use in a mold for molding plastics, the material comprising, in a tempered state, a material hardness of between 355 HB and 410 HB and a composition consisting essentially of, in weight percent:
C=0.25 to 0.35
Si=0.04 to 0.20
Mn=1.00 to 2.00
Cr=1.00 to 2.00
Ni=0.30 to less than 0.90
Mo=0.30 to 0.80
V=less than/equal to 0.20
Al=0.01 to 0.03
N=0.0025 to 0.0150
S=less than 0.15
a remainder of Fe and impurities.