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AssigneeHitachi Metals, Ltd.
InventorsYukio Abe, Hideshi Nakatsu, Yasushi Tamura, Yoshihiro Kada
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There are provided a high-hardness prehardened steel for cold working having excellent machinability containing, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, and 0.08 to 0.25% S, a die for cold working which is fabricated by cutting this prehardened steel at a cutting speed not less than 50 m/min. This steel is hardened and tempered to have a hardness not less than 50 HRC. Preferably, this steel consists, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, 0.1 to 2.0% Mn, 0.08 to 0.25% S, 0.5 to 15.0% Cr, at least one selected from the group consisting of W and Mo an amount of which one is not more than 3.5% in total in terms of (Mo+1/2W), not more than 4.0% V, not more than 0.15% N, and the balance Fe and incidental impurities.
A high-hardness prehardened steel for cold working having excellent machinability, containing, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, and 0.08 to 0.25% S, said steel for cold working being hardened and tempered to have a hardness more than 50 HRC.
A high-hardness prehardened steel for cold working having excellent machinability, consisting, by mass, of not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, 0.1 to 2.0% Mn, 0.08 to 0.25% S, 0.5 to 15.0% Cr, at least one selected from the group consisting of W and Mo an amount of which at least one is not more than 3.5% in total in terms of (Mo+1/2W), not more than 4.0% V, not more than 0.15% N, and the balance Fe and incidental impurities, said steel for cold working being hardened and tempered to have a hardness more than 50 HRC.
A high-hardness prehardened steel for cold working having excellent machinability, consisting, by mass, of not less than 0.3% to 0.45% C, 0.8 to 2.0% Si, 0.1 to 2.0% Mn, 0.08 to 0.25% S, 4.0 to 6.0% Cr, at least one selected from the group consisting of W and Mo an amount of which at least one is not more than 2.0% in total in terms of (Mo+1/2W), not more than 1.0% V, not less than 0.01% but not more than 0.15% N, and the balance Fe and incidental impurities, said steel for cold working being hardened and tempered to have a hardness more than 50 HRC.
A high-hardness prehardened steel for cold working having excellent machinability, consisting, by mass, of:
A high-hardness prehardened steel for cold working having excellent machinability, consisting, by mass, of:
A die for cold working, said die being made of a high-hardness prehardened steel for cold working having excellent machinability, said steel containing, by mass, not less than 0.3% but less than 0.5% C, 0.7 to 2.0% Si, and 0.08 to 0.25% S, said steel being hardened and tempered to have a hardness more than 50 HRC, and said steel being then subjected to cutting working.
A die for cold working, said die being made of a high-hardness prehardened steel for cold working having excellent machinability, said steel consisting, by mass, of:
A die for cold working, said die being made of high-hardness prehardened steel for cold working having excellent machinability, said steel consisting, by mass, of:
A die for cold working, said die being made of a high-hardness prehardened steel for cold working having excellent machinability, said steel consisting, by mass, of:
A method of working a high-hardness prehardened steel having excellent machinability, comprising the steps of:
A method of working a high-hardness prehardened steel having excellent machinability, comprising the steps of:
A method of working a high-hardness prehardened steel having excellent machinability, comprising the steps of:
A method of working a high-hardness prehardened steel having excellent machinability, comprising the steps of:
Dependencies are inferred from the claim text.