Extra-thick hydrogen present 15CrMoR steel plate and production method thereof

Abstract

The invention discloses an extra-thick hydrogen present 15CrMoR steel plate and a production method thereof. The steel plate comprises the following elements in percentage by weight: 0.12-0.17 percent of C, less than or equal to 0.20 percent of Si, 0.40-0.70 percent of Mn, less than or equal to 0.008 percent of P, less than or equal to 0.003 percent of S, 0.14-0.18 percent of Ni, 0.80-1.20 percent of Cr, less than or equal to 0.10 percent of Cu, 0.45-0.60 percent of Mo, 0.025-0.050 percent of Al, less than or equal to 0.016 percent of As, ess than or equal to 0.008 percent of Sn, less than or equal to 0.003 percent of Sb and Fe and unavoidable impurities in balancing weight. The production method comprises the steps of converter smelting, LF (Ladle Furnace) refining, vacuum refining, pouring, heating, rolling, cooling control, slow cooling, heat treatment and the like. According to the invention, the chemical elements of the steel plate are designed via the Cr-Mo taken as the basic alloy element, through the converter smelting, the LF refining, VD (Vacuum Degassing) furnace vacuum degasification, plate rolling, crack detection, normalization, tempering, steel plate finishing operation, performance inspection, as well as rolling control, cooling control, normalization and tempering, the particle size of steel is more than 8.0, and the elements are organized to a tempering sorbite; and through the effective implement of the measurements, the hydrogen present steel plate with a thickness of 120 mm to 150 mm and good corrosion resistance is successfully produced, and the steel plate is provided with higher intensity and good tenacity, and has favorable welding performance.

Description

technical field [0001] The invention relates to an extra-thick steel plate and a manufacturing method thereof, in particular to an extra-thick hydrogenated 15CrMoR steel plate and a manufacturing method thereof. Background technique [0002] 15CrMoR is widely used in petroleum, chemical, power station, boiler and other industries to make reactors, heat exchangers, oil and gas tanks, liquefied gas tanks, nuclear reactor pressure shells and other equipment and components. [0003] Conventional 15CrMoR generally does not require hydrogen-facing properties, and has relatively low requirements for elements such as P, Sn, As, Si, and Sn. In addition, due to the difficulty in the heat treatment process of thick steel plates, the commercialized 15CrMoR hydrogen-resistant steel plates have a narrow range of specifications. The latest national standard stipulates that the thickness limit is 150mm. The current domestic production technology equipment and process technology level, the t...

AI Technical Summary

Problems solved by technology

In addition, due to the difficulty in the heat treatment process of thick steel plates, the commercialized 15CrMoR hydrogen-resistant steel plates have a narrow range of specifications, and the latest national standard stipulates that the thickness limit is 150mm. The current domestic production technology equipment and process technology level, the thickness exceeds 120mm. It is difficult to guarantee the performance of the steel plate, unable to meet the growing demand of the thick plate market, mainly relying on imported products

Images