Microstructure and Mechanical Properties of Steel Grade 14MoV6-3

Abstract

Steel grade 14MoV6-3 is a low-carbon microalloyed steel with addition of chromium and molybdenum. This medium-strength steel exhibits a ferritic-bainitic microstructure after the heat treatment. This grade is designed mainly for power industry applications, withstanding operating temperatures up to 580 °C; in Železiarne Podbrezová, this particular grade is used for production of hot rolled seamless boiler tubes. In this paper we present the basic chemical concept of 14MoV6-3 steel along with its mechanical properties after the heat treatment. Further, analysis of the final microstructure, carbide phases and precipitation of vanadium is being presented as well. For this purpose, the yield stress theory has been proposed along with predictive nomograms for selected ferritic-bainitic phases. According to the results of DTA analyses, necessary conditions for heat treatment after rolling have been proposed. Finally, CCT diagrams for required ferritic-bainitic structure are presented as well.

Numerical simulation of fatigue crack propagation: A case study of defected steam pipeline

“…Since 1970s the steel grade 14MoV6-3 has been used in thermal power plants in Serbia for the manufacturing of equipment designed to operate at elevated temperatures. Operational experiences with plant components' made of this particular grade are beyond expectation because most of the examined elements have exceeded their assessed operating life of 100,000 hours under operational conditions of steam temperature of 540 °C and steam pressure of 4.5 MPa, [1][2][3][4][5][6].…”