HOT-WORKING STEEL
The present invention relates to a hot-working steel having a chemical composition, in % by weight, of 0.30-0.50% C, 0-1.5% Si, 1-1.8% Mn, 1.5-3.5% Cr, 0.3-0.9% (Mo+W/2), 0.4-0.8% (V+N/2), <3.5% (Mo+Cr), with a remainder of iron and unavoidable impurities.
1 . A hot-working steel, comprising, in % by weight:
0.30-0.50% C
0-1.5% Si
1%<Mn<1.8%
1.5-3.5% Cr
0.3-0.9% (Mo+W/2)
0.4-0.8% (V+N/2),
<3.5% (Mo+Cr), and
the remainder being iron and unavoidable impurities.
2 . A steel according to claim 1 , wherein the content of C, in % by weight, is 0.38-0.46%.
3 . A steel according to claim 1 , wherein the content of Si, in % by weight, is 0.3-1.35%.
4 . A steel according to claim 1 , wherein the content of Mn, in % by weight, is 0.3-1.5%.
5 . A steel according to claim 1 , wherein the content of Cr, in % by weight, is 0.7-3.0%.
6 . A steel according to claim 1 , wherein the content of Mo, in % by weight, is 0.45-0.8%.
7 . A steel according to claim 1 , wherein the content of V, in % by weight, is 0.45-0.7%.
8 . A steel according to claim 1 , wherein the content of Cr in relation to the content of Mo, in % by weight, satisfies the condition Cr/Mo>3.
9 . A steel according claim 1 , wherein the content of Mo as well as the content of V are both less than 0.7% by weight.
10 . A steel according to claim 7 , wherein the content of V is 0.5-0.6% by weight.
11 . A steel according to claim 1 , further comprising not more than 0.05% by weight of Al.
12 . A steel according to claim 1 , wherein the content of Al, in % by weight, is 0.3-1.0%.
13 . (canceled)
14 . A steel according to claim 10 , having a thermal conductivity of more than 26 W/m° C. at 200° C.
15 . A steel according to claim 1 , used for the production of a tool for extrusion pressing.
16 . A steel according to claim 15 , used for the production of a tool for extrusion pressing of aluminium.
17 . A steel according to claim 2 , wherein the content of C, in % by weight, is 0.40-0.44%.
18 . A steel according to claim 3 , wherein the content of Si, in % by weight, is 0.5-1.2%.
19 . A steel according to claim 4 , wherein the content of Mn, in % by weight, is 0.5-1.35%.
20 . A steel according to claim 5 , wherein the content of Cr, in % by weight, is 2.2-2.8%.
21 . A steel according to claim 6 , wherein the content of Mo, in % by weight, is 0.5-0.7%.
22 . A steel according to claim 12 , wherein the content of Al, in % by weight, is about 0.7%.