12Cr2Mo1R heavy plate under critical hydrogen and heat treatment process thereof

Abstract

The invention discloses a 12Cr2Mo1R heavy plate under critical hydrogen, which comprises, by weight, 0.12 to 0.15 percent of C, equal to less than 0.10 percent of Si, 0.50 to 0.60 percent of Mn, equal to or less than 0.008 percent of P, equal to or less than 0.005 percent of S, 2.35 to 2.50 percent of Cr, 0.95 to 1.05 percent of Mo, 0.020 to 0.045 percent of Al, 0.013 to 0.020 percent of Nb, equal to or less than 0.15 percent of Cu, equal to or less than 0.003 percent of Sb, equal to or less than 0.015 percent of Sn, equal to or less than 0.016 percent of As, equal to or less than 0.002 percent of O, equal to or less than 0.008 percent of N, equal to or less than 0.0002 percent of H, and the balance Fe as well as unavoidable impurities. The standard of 12Cr2Mo1R heavy plate under critical hydrogen defined by national standard GB 713-2008 has been improved. Constituent elements of 12Cr2Mo1R heavy plate under critical hydrogen and the proportion of the elements have also been optimized. The thickness of the obtained 12Cr2Mo1R heavy plate under critical hydrogen is within 155-170 mm, thereby increasing the thickness of the plate while ensuring the mechanical properties of the plate to be compatible with the standards for plates with a thickness of less than 150 mm defined by national standard 713-2008.

Description

technical field [0001] The invention relates to a large-thickness hydrogen-facing 12Cr2Mo1R steel plate and a heat treatment process thereof, belonging to the technical field of iron and steel. Background technique [0002] The hydrogen 12Cr2Mo1R steel plate is formulated according to the national standard GB713-2008, but the maximum thickness of the hydrogen 12Cr2Mo1R steel plate in the national standard is 150mm. However, with the development of economy and technology, the market also has a great demand for thicker hydrogen-facing 12Cr2Mo1R steel plates, especially large-thickness hydrogen-facing steel plates greater than 150mm. However, when the steel plate develops in the direction of large thickness, it often encounters the problem of performance degradation in various aspects. If the thickness of the steel plate is directly increased on the basis of maintaining the existing ratio and process, the obtained large thickness steel plate cannot reach The performance parame...

AI Technical Summary

Problems solved by technology

However, when the steel plate develops in the direction of large thickness, it often encounters the problem of performance degradation in various aspects. If the thickness of the steel plate is directly increased on the basis of maintaining the existing ratio and process, the obtained large thickness steel plate cannot reach The performance parameters formulated by the national standard GB713-2008, so the current priority is to optimize the element ratio of the steel plate and improve the heat treatment process of the steel plate