METHOD FOR PRODUCTION OF LOW-ALLOY ROLLED PRODUCTS Russian patent published in 2023 - IPC C21D8/02 B21B1/26 C22C38/60 

FIELD: metallurgy.

SUBSTANCE: invention relates to rolling production, and can be used for the manufacture of rolled products from low-alloy pipe steels with increased corrosion resistance. The method for the production of low-alloy rolled steel includes obtaining a continuously cast billet, its austenization, rough and finish rolling, cooling with water to the temperature of winding into a coil. At the same time, a continuously cast billet is obtained from steel containing, wt.%: carbon 0.02-0.10, silicon 0.1-0.4, manganese 0.4-1.0, sulphur not more than 0.010, phosphorus not more than 0.015, chromium 0.2-0.8, nickel 0.05-0.5, copper 0.01-0.5, aluminium, not more than 0.06, niobium 0.001-0.1, titanium 0.002-0.08, vanadium 0.01-0.15, molybdenum not more than 0.3, boron not more than 0.001, nitrogen not more than 0.010, calcium not more than 0.005, tin not more than 0.005, antimony not more than 0.005, zinc not more than 0.005, lead not more than 0.005 , beryllium not more than 0.01. In this case, the austenization of the continuously cast billet is carried out at a temperature of 1150-1370°C, rough rolling is completed at a temperature not exceeding 1150°C, then the rolling is held for at least 30 s, finishing rolling is started at a temperature of 950-1100°C and finish at a temperature of 870-960°C, cooling of rolled products in water-cooled sections is carried out at an average speed of at least 15°C/s up to coiling temperature 550-660°C, after which the rolled product is wound into a roll.

EFFECT: rolled products with a thickness of 4-22 mm of high corrosion resistance while maintaining the level of strength and plastic characteristics corresponding to the strength category K52-K60.

4 cl, 1 ex, 3 tbl