Kinetics of Austenite Transformation and Bainite Structure Formation during Strain-Heat Hardening of Low-Perlite Steel X70 (Х65) (API 5L Gr X-60, API 5L Gr X-70) Plates for Gas Pipelines  Full text 

Z. I. Nekrasov Iron & Steel Institute of National Academy of Sciences of Ukraine
1 Academician Starodubov Square, Dnipropetrovsk 49050, Ukraine

Metall. Min. Ind.,  2010, Vol. 2, No. 1, pp. 39-42

UDC 669.15-194.2:51.001.57

Abstract

The kinetics of austenite transformation and bainite structure formation during controlled rolling and strain-heat hardening of plates for Х70 (Х65) (API 5L Gr X-60, API 5L Gr X-70) steel gas pipelines was investigated. We have determined the optimum cooling rates of plates and
molibdenum concentration in low-perlite steel providing the necessary amount of bainite structure at strain-heat hardening of plate products on mill 3600.

PLATE, CONTROLLED ROLLING, STRAIN-HEAT HARDENING, BAINITE STRUCTURE, CHEMICAL COMPOSITION, MOLIBDENUM, COOLING RATE, STRUCTURE FORMATION