US2009191086A1PendingUtilityA1

Hot-working steel

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Assignee: UDDEHOLM TOOLING ABPriority: Apr 6, 2006Filed: Mar 30, 2007Published: Jul 30, 2009
Est. expiryApr 6, 2026(expired)· nominal 20-yr term from priority
Inventors:Odd SandbergBengtt Klarenfjord
C22C 38/24C22C 38/22C21D 9/0068C22C 38/04C21D 8/02C22C 38/002C22C 38/02C22C 38/06C22C 38/38
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Claims

Abstract

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.

Claims

exact text as granted — not AI-modified
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%.

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