Steel and mould tool for plastic materials made of the steel
The invention concerns a steel, particularly a steel for mould tools for plastic moulding, having the following chemical composition in weight-%:0.43-0.60 C from traces to 1.5 Si from traces to 1.5 (Si+Al) 0.1-2.0 Mn 3.0-7.0 Cr 1.5-4.0 (Mo+), however max. 1.0 W 0.30-0.70 V max. 0.1 of each of Nb, Ti and Zr max. 2.0 Co max. 2.0 Ni balance essentially only iron and unavoidable impurities. After hardening and high temperature tempering at 520-560° C., the steel has a hardness of 56-68 HRC.
1. Hot worked steel for plastic molding essentially void of primary carbides, having been subjected to austenitizing at 950-1025° C. and hardening and high temperature tempering at 500-570° C., having a hardness of 54-59 HRC and an impact toughness in transverse direction greater than or equal to 80 J, comprising the following chemical composition in weight-%:
0.41-0.60 C;
from traces to 0.5 Si;
from traces to 0.5=(Si+Al);
0.1-2.0 Mn;
3.0-5.5 Cr;
1.5-3.1=(Mo+W/2), however max. 1.0 W and max. 2.6 Mo;
0.30-0.70 V;
max. 0.1 of each of Nb, Ti and Zr;
max. 2.0 Co;
max. 2.0 Ni; and
balance essentially only iron and unavoidable impurities.
2. Steel according to claim 1 , containing at least 2.1 Mo.
3. Steel according to claim 1 , containing at least 0.44 C.
4. Steel according to claim 3 , containing max. 0.55 C.
5. Steel according to claim 1 , containing at least 0.40 V.
6. Steel according to claim 5 , containing max. 0.65 V.
7. Steel according to claim 1 , containing about 0.49 C and about 0.52V.
8. Steel according to claim 1 , containing at least 0.05 and max. 0.50 Si.
9. Steel according to claim 8 , containing at least 0.1 Si.
10. Steel according to claim 9 , containing nominally 0.2 Si.
11. Steel according to claim 1 , containing max. 0.50 Al.
12. Steel according to claim 1 , containing max. 0.3 W.
13. Steel according to claim 1 , containing max. 0.7 Co.
14. Steel according to claim 13 , wherein the steel does not contain cobalt exceeding impurity level.
15. Steel according to claim 1 , containing max. 1.0 Ni.
16. Steel according to claim 15 , containing max. 0.7 Ni.
17. Steel according to claim 16 containing 0.3-0.7 Ni.
18. Steel according to claim 16 , wherein the steel does not contain nickel exceeding impurity level.
19. Steel according to claim 1 , wherein the content of each of the elements titanium, zirconium and niobium does not exceed 0.03.
20. Steel according to claim 19 , wherein the content of each of the elements titanium, zirconium and niobium does not exceed 0.01.
21. Steel according to claim 20 , wherein the content of each of the elements titanium, zirconium and niobium does not exceed 0.005.
22. Steel according to claim 1 , wherein the steel does not contain more than max. 0.035 P.
23. Steel according to claim 1 , wherein the steel contains max. 20 ppm O.
24. Steel according to claim 1 , wherein the steel contains max. 300 ppm N.
25. Steel according to claim 1 , wherein the steel is ESR remelted.
26. Mold tool manufactured of steel according to claim 1 .
27. Steel according to claim 3 , containing at least 0.46 C.
28. Steel according to claim 3 , containing max. 0.53 C.
29. Steel according to claim 27 , containing max. 0.55 C.
30. Steel according to claim 29 , containing max. 0.53 C.
31. Steel according to claim 5 , containing at least 0.45 V.
32. Steel according to claim 5 , containing max. 0.60 V.
33. Steel according to claim 31 , containing max. 0.65 V.
34. Steel according to claim 33 , containing max. 0.60 V.
35. Steel according to claim 11 , containing max. 0.3 Al.
36. Steel according to claim 35 , containing max. 0.1 Al.
37. Steel according to claim 36 , containing max. 0.03 Al.
38. Steel according to claim 12 , containing max. 0.1 W.
39. Steel according to claim 38 , wherein the steel does not contain tungsten exceeding impurity level.
40. Steel according to claim 22 , wherein the steel does not contain more than max. 0.015 P.
41. Steel according to claim 40 , wherein the steel does not contain more than max. 0.010 P.
42. Steel according to claim 23 , wherein the steel contains max. 10 ppm O.
43. Steel according to claim 24 , wherein the steel contains max. 150 ppm N.
44. Steel according to claim 43 , wherein the steel contains max. 100 ppm N.
45. Steel according to claim 1 , wherein the steel, after hardening and high temperature tempering at 520-560° C., has a hardness of 56-58 HRC.
46. Mold tool according to claim 26 , wherein the steel, after hardening and high temperature tempering at 520-560° C. has a hardness of 56-58 HRC.
47. Steel according to claim 1 , wherein the austenitizing temperature is less than 1020° C.
48. Mold tool according to claim 26 , wherein the austenitizing temperature is less than 1020° C.
49. Steel according to claim 1 , wherein the austenitizing temperature is less than 1000° C.
50. Mold tool according to claim 26 , wherein the austenitizing temperature is less than 1000° C.
51. Steel according to claim 1 , having an impact toughness in transverse direction greater than 159 J.
52. Steel according to claim 51 , having an impact toughness in transverse direction greater than 196 J.
53. Steel according to claim 52 , having an impact toughness in transverse direction greater than 216 J.
54. Steel according to claim 53 , having an impact toughness in transverse direction greater than 239 J.
55. Steel according to claim 54 , having an impact toughness in transverse direction greater than 285 J.
56. Steel according to claim 55 , having an impact toughness in transverse direction greater than 336 J.
57. Steel with a material composition, in weight-%, at an austenitizing temperature of 1020° C, comprising:
0.46-0.51 C
0.10-0.25 Si
0.40-0.60 Mn
4.85-5.15 Cr
2.20-2.40 Mo
0.47-0.57 V
0.42-0.46 dissolved C, and
balance essentially only iron and unavoidable impurities,
wherein the MC carbide content is between 0.51-0.59 volume-%, with M referring to an alloying element, and
wherein the steel, having been tempered and cooled to ambient temperature, has a hardness of 54-59 HRC and an impact toughness in transverse direction greater than or equal to 80 J.
58. Steel according to claim 57 , wherein the steel comprises:
0.49 C
0.20 Si
0.50 Mn
5.00 Cr
2.30 Mo
0.52 V
0.44 dissolved C, and
0.56 volume-% MC carbides.
59. Steel according to claim 27 , containing max. 0.51 C.
60. Steel according to claim 9 , containing max. 0.25 Si.
61. Steel according to claim 1 , containing 0.40-0.60 Mn.
62. Steel according to claim 1 , containing 4.85-5.15 Cr.
63. Steel according to claim 1 , containing 2.20-2.40 Mo.
64. Steel according to claim 1 , containing 0.47-0.57 V.
65. Steel according to claim 1 , containing 0.1-0.3 S.
66. Steel according to claim 1 , containing max. 0.03 S.
67. Steel according to claim 66 , containing max. 0.01 S.
68. Steel according to claim 67 , containing max. 0.003 S.