PRODUCTION METHOD OF ROLLED METAL FROM LOW-ALLOY STEEL FOR MANUFACTURE OF STRUCTURAL MEMBERS OF OIL AND GAS LINES Russian patent published in 2013 - IPC C21D8/02 C22C38/28 B21B1/26 

FIELD: metallurgy.

SUBSTANCE: continuous cast steel billets of certain chemical composition are produced; their austenisation is performed at the temperature of 1180-1210°C; then, roughing-down is performed at the temperature of 940-1180°C with reduction of cross-sectional areas per pass of not less than 12%, air cooling of deformed billet to the temperature of 720-780°C is performed, finish rolling is performed at the temperature interval of 750-790°C with total reduction of cross-sectional area of 50-60% and accelerated cooling of a finished rolled metal is performed at temperature interval of 730-770°C to 580-620°C with cooling rate of 15-20°C/sec.

EFFECT: development of a 60-90 mm thick rolled metal production technology with guaranteed yield point of not less than 275 MPa and increased impact strength.

2 tbl, 1 ex