Process for the production of hardened parts of steel
AssigneeSKF GmbH
InventorFrank Hengerer
Life of this patent
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Abstract
A method for producing hardened parts of steel from an air-hardening steel comprising the steps of heating the steel is heated to a temperature above 1,100° C., hot-working the steel parts until they reach the A1 emperature, cooling the steel parts in air to about 280° C. under simultaneous thermo-mechanical sizing treatment, then cooling the steel parts in air to room temperature, stress relief treating the steel parts at 150-250° C., and hard-machining the steel parts.
Claims3
A method for producing hardened parts of steel comprising the steps in the sequence of:
- heating steel parts to a temperature of about 1,100° C.;
- hot-working the steel parts to about the A1 temperature;
- cooling the steel parts in air to about 280° C.;
- while simultaneously sizing the steel parts with a thermo-mechanical process at a temperature between said A1 temperature and the martensite temperature;
- then cooling the steel parts to room temperature in an air hardening process;
- annealing the steel parts at between about 150°-250° C. to a hardness greater than 60 HRC;
- and
- machining the steel parts to dimensional accuracy.
A method for producing hardened parts of steel having a chemical composition comprising 0.5-0.9% carbon (C), 0-1.0% manganese (Mn), 0-2.0% silicon (Si), 0-2.0% nickel (Ni), 0-0.7% molybdenum (Mo), 0-2.0% chromium (Cr), 0-0.3% vanadium, and the remainder iron and the normal impurities and processed in a manner to produce parts having hard surfaces for repeated cycles of rolling contact comprising the steps in the sequence of:
- heating steel parts to a temperature of about 1,100° C.;
- hot-working the steel parts to about the A1 temperature;
- cooling the steel parts in air to about 280° C.;
- while simultaneously sizing the steel parts with a thermo-mechanical process at a temperature between said A1 temperature and the martensite temperature;
- then cooling the steel parts to room temperature in an air hardening process;
- annealing the steel parts at between about 150°-250° C. to a hardness greater than 60 HRC;
- and
- machining the hardened steel parts to dimensional accuracy.
A method for producing hardened parts of steel having a chemical composition comprising 0.5-0.9% carbon (C), 0-1.0% manganese (Mn), 0-2.0% silicon (Si), 0-2.0% nickel (Ni), 0-0.7% molybdenum (Mo), 0-2.0% chromium (Cr), 0-0.3% vanadium, and the remainder iron and the normal impurities and processed in a manner to produce parts having hard surfaces for repeated cycles of rolling contact comprising the steps in the sequence of:
- heating steel parts to a temperature of about 1,100° C.;
- hot-working the steel parts to about the A1 temperature;
- cooling the steel parts in air to about 280° C.;
- while simultaneously sizing the steel parts with a thermo-mechanical process at a constant temperature between said A1 temperature and the martensite temperature;
- then cooling the steel parts to room temperature in an air hardening process;
- annealing the steel parts at between about 150°-250° C. to a hardness greater than 60 HRC;
- and
- machining the hardened steel parts to dimensional accuracy.
Dependencies are inferred from the claim text.