Hot-rolled steel with very high elasticity limit and mechanical resistance usable in particular for auto parts production
AssigneeUsinor
InventorsXavier Bano, Jacques Devroc
Life of this patent
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Abstract
Hot-rolled steel with very high elasticity limit and mechanical resistance usable in particular for auto parts production, characterized by the following composition by weight: 0.08%<carbon<0.16% 1%<manganese<2% 0.02%<aluminum<0.1% silicon<0.5% phosphorus<0.03% sulfur<0.01% vanadium<0.3% chromium<1% nitrogen<0.015% molybdenum<0.6%.
Claims7
A hot-rolled steel with very high maximum elasticity and mechanical resistance usable in particular for producing auto parts, said steel comprising an entirely bainitic structure and the following composition by weight:
- 0.08%<carbon<0.2%
- 1%<manganese<2%
- 0.02%<aluminum<0.1%
- silicon<0.5%
- phosphorus<0.03%
- sulfur<0.01%
- 0.1%<vanadium<0.3%
- chromium<1%
- nitrogen<0.015%
- molybdenum<0.6%
- the rest being of steel and impurities inherent in processing, wherein said steel does not comprise niobium.
A process for producing a hot-rolled steel sheet strip with very high resistance usable to produce auto parts, wherein the steel comprises an entirely bainitic structure and the following composition by weight:
- 0.08%<carbon<0.16%
- 1%<manganese<2%
- 0.02%<aluminum<0.1%
- silicon<0.5%
- phosphorus<0.03%
- sulfur<0.01%
- 0.1%<vanadium<0.3%
- chromium<1%
- nitrogen<0.015%
- molybdenum<0.6%
- the rest being of iron and impurities inherent in processing, wherein the steel does not comprise niobium and is subjected to:
- rolling at a temperature below 950° C.,
- cooling carried out at a rate of more than 20° C. per second up to a temperature ranging from 400° C. to 600° C.
Dependencies are inferred from the claim text.