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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

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Author(s): V. I. Spivakov | E. A. Orlov | P. L. Litvinenko | A. V. Nogovitsyn

Journal: Metallurgical and Mining Industry
ISSN 2076-0507

Volume: 2;
Issue: 1;
Start page: 39;
Date: 2010;
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Keywords: PLATE | CONTROLLED ROLLING | STRAIN-HEAT HARDENING | BAINITE STRUCTURE | CHEMICAL COMPOSITION | MOLIBDENUM | COOLING RATE | STRUCTURE FORMATION

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 andmolibdenum concentration in low-perlite steel providing the necessary amount of bainite structure at strain-heat hardening of plate products on mill 3600.
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