FIELD: metallurgy.
SUBSTANCE: it is implemented steel making, containing, wt %: 0.04-0.09 carbon; not more than 0.30 silicon; 0.41-0.70 manganese; 0.04-0.12 phosphorus; 0.01-0.08 aluminium; not more than 0.009 nitrogen, iron and unavoidable admixtures - the rest, slab pouring, hot rolling of slab into strips with finishing temperature 800-890°C, cooling by water, winding of strips into coils at temperature 500-610°C and strips etching. Steel additionally contains, wt %: 0.01-0.03 titanium; 0.0008-0.0030 boron.
EFFECT: increasing of steel strength properties and holding of formability.
3 cl, 2 tbl
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RU2361933C1 |
