Hot worked steel and tool made therewith
Abstract
A hot worked matrix steel consisting of (in weight-%) 0.60-0.85 C, 0.05-0.5 Si, ≦0.5 (Si+Al), 0.1-2.0 Mn, 4.5-5.5 Cr, 1.5-2.6 Mo, ≦1.0 W, 1.5-2.6 (Mo+W/2), 0.42-0.65 V, ≦0.1 Nb, ≦0.1 Ti, ≦0.1 Zr, ≦2.0 Co, ≦2.0 Ni, ≦0.003 S, optionally, up to 30 ppm B, balance iron and unavoidable impurities. 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. The steel consists of tempered martensite. The steel contains 1.04 vol. % or less of primary precipitated vanadium carbides. The steel is void of primary carbides other than primary precipitated vanadium carbides.
Claims
exact text as granted — not AI-modified1 . 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.Join the waitlist — get patent alerts
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