METHOD OF HOT ROLLING OF HIGH-STRENGTH LOW-ALLOY SHEETS

摘要

FIELD: process engineering. ^ SUBSTANCE: invention serves to increase uniformity of mechanical properties of wide hot-rolled sheets, mainly from high-strength low-alloy steel grades with hardness of 345-390. Billet from structural steel with carbon content not exceeding 0.16 % microalloyed by carbonitride-forming elements is rolled at thick-sheet hot rolling mill at rolling end temperature of 790-850 C into 8-50 mm-thick strip. After rolling, said strip is subjected to differential water cooling. ^ EFFECT: uniform mechanical properties in wide range of thickness of 8-50 mm are reached by process parameters defined by claimed mathematical expressions. ^ 1 tbl