Hot worked steel and tool made therewith

1. A hot worked matrix steel consisting of (in weight-%):

C 0.60-0.85

Si 0.05-0.5

(Si+Al) ≦0.5

Mn 0.1-2.0

Cr 4.5-5.5

Mo 1.5-2.6

W ≦1.0

(Mo+W/2) 1.5-2.6

V 0.42-0.65

Nb ≦0.1

Ti ≦0.1

Zr ≦0.1

Co ≦2.0

Ni ≦2.0

S ≦0.003

optionally, up to 30 ppm B,

balance iron and unavoidable impurities,

wherein the steel after hardening and tempering at 520-600° C. (2×2 h) has a hardness of 57-63 HRC and an un-notched impact energy in the transverse direction of 20-100 J,

wherein the steel consists of tempered martensite,

wherein the steel contains 1.04 vol. % or less of primary precipitated vanadium carbides, and

wherein the steel is void of primary carbides other than primary precipitated vanadium carbides.

2. The hot worked matrix steel according to claim 1 , wherein the steel consists of at least 0.63 C.

3. The hot worked matrix steel according to claim 2 , wherein the steel consists of max. 0.8 C.

4. The hot worked matrix steel according to claim 2 , wherein the steel consists of max. 0.78 C.

5. A tool made from the hot worked steel according to claim 4 , wherein the tool after hardening and high temperature tempering at 520-560° C., has a hardness of 60-62 HRC.

6. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 0.60 V.

7. The hot worked matrix steel according to claim 1 , wherein the steel consists of about 0.72 C and about 0.50 V.

8. The hot worked matrix steel according to claim 1 , wherein the steel consists of at least 0.1 Si.

9. The hot worked matrix steel according to claim 1 , wherein the steel consists of at least 1.8 Mo.

10. The hot worked matrix steel according to claim 9 , wherein the steel consists of at least 2.1 Mo.

11. The hot worked matrix steel according to claim 9 , wherein the steel consists of max. 0.1 W.

12. The hot worked matrix steel according to claim 9 , wherein the steel consists of max. 0.3 W.

13. The hot worked matrix steel according to claim 12 , wherein the steel consists of tungsten not exceeding impurity level.

14. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 0.7 Co.

15. The hot worked matrix steel according to claim 14 , wherein the steel consists of cobalt not exceeding impurity level.

16. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 1.0 Ni.

17. The hot worked matrix steel according to claim 16 , wherein the steel consists of max. 0.7 Ni.

18. The hot worked matrix steel according to claim 17 , wherein the steel consists of nickel not exceeding impurity level.

19. The hot worked matrix steel according to claim 1 , wherein the content of each of the elements titanium, zirconium, and niobium does not exceed 0.03.

20. The hot worked matrix steel according to claim 19 , wherein the content of each of titanium, zirconium, and niobium does not exceed 0.01.

21. The hot worked matrix steel according to claim 19 , wherein the content of each of the elements titanium, zirconium and niobium does not exceed 0.005.

22. The hot worked matrix steel according to claim 1 , wherein the steel consists of not more than max. 0.035 P.

23. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 20 ppm O.

24. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 300 ppm N.

25. The hot worked matrix steel according to claim 1 , wherein the steel has a hardness of 60-62 HRC.

26. A tool manufactured of the hot worked matrix steel according to claim 1 .

27. The tool according to claim 26 , wherein the tool has a hardness of 60-62 HRC.

28. The hot worked matrix steel according to claim 1 , wherein the steel consists of at least 0.68 C.

29. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 0.55 V.

30. The hot worked matrix steel according to claim 1 , wherein the steel consists of at least 0.2 Si.

31. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 0.3 Al.

32. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 0.03 Al.

33. The hot worked matrix steel according to claim 1 , wherein the steel consists of not more than max. 0.015 P.

34. The hot worked matrix steel according to claim 1 , wherein the steel consists of not more than max. 0.010 P.

35. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 10 ppm O.

36. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 150 ppm N.

37. The hot worked matrix steel according to claim 1 , wherein the steel consists of max. 100 ppm N.

38. The hot worked matrix steel according to claim 1 , wherein the steel after hardening and high temperature tempering at 520-560° C., has a hardness of 60-62 HRC.

39. The hot worked matrix steel according to claim 1 , wherein the steel has the un-notched impact energy in the transverse direction is greater than 30 J.

40. The hot worked matrix steel according to claim 1 , wherein the steel has the un-notched impact energy in the transverse direction is greater than 40 J.

41. A hot worked matrix steel consisting of (in weight-%):

C 0.60-0.85

Si 0.05-0.5

(Si+Al) ≦0.5

Mn 0.1-2.0

Cr 4.5-5.5

Mo 1.5-2.6

W ≦1.0

(Mo+W/2) 1.5-2.6

V 0.42-0.65

Nb ≦0.1

Ti ≦0.1

Zr ≦0.1

Co ≦2.0

Ni ≦2.0

S ≦0.003

5-75 ppm Ca and 50-100 ppm O

optionally, up to 30 ppm B,

balance iron and unavoidable impurities,

wherein the steel after hardening and tempering at 520-600° C. (2×2 h) has a hardness of 57-63 HRC and an un-notched impact energy in the transverse direction of 20-100 J,

wherein the steel consists of tempered martensite,

wherein the steel contains 1.04 vol. % or less of primary precipitated vanadium carbides, and

wherein the steel is void of primary carbides other than primary precipitated vanadium carbides.

42. The hot worked matrix steel according to claim 41 , wherein the steel consists of 5-50 ppm Ca and 60-90 ppm O.