STRIP ROLLED PRODUCTS FROM BORON-CONTAINING MANGANESE STEEL Russian patent published in 2012 - IPC C22C38/54 C22C38/32 

FIELD: metallurgy.

SUBSTANCE: steel contains carbon, silica, manganese, sulphur, phosphorus, chrome, nickel, copper, molybdenum, titanium, aluminium, calcium, boron and iron at the following component ratio, wt %: carbon 0.33 -0.45, manganese 0.90 - 1.30, silica 0.15 - 0.37, phosphorus not more than 0.030, sulphur from more than 0.01 to 0.040, chrome 0.15 - 0.25, nickel not more than 0.30, copper not more than 0.30, molybdenum 0.02 - 0.04, titanium 0.01 - 0.045, aluminium 0.02 - 0.05, boron 0.0010 - 0.0030, calcium 0.0001 - 0.005, ferrum the rest. For steel components the following ratio is satisfied [S] / [Al]+[Ti]+[Ca] = 0.3 - 0.5.

EFFECT: increase of rolled products application properties and yield ratio at steel casting, provision of specified degree of hardness penetration.

1 ex