Extra-thick steel plate for high-pressure heater and manufacturing method thereof

Abstract

The invention discloses an extra-thick steel plate for high pressure heaters and a manufacturing method thereof. The steel plate includes 0.15-0.23% of C, 0.15-0.35% of Si, 0.50-0.90% of Mn, P which is less than or equal to 0.010%, S which is less than or equal to 0.050%, 0.60-0.90% of Mo, 0.03-0.06% of Nb, and 0.015-0.040% of Als, with the balance being Fe and inevitable impurities; and the performance indexes of the manufactured extra-thick steel plate with a thickness specification of 100-180 mm are as follows: Rel is greater than or equal to 437 MPa, Rm is greater than or equal to 582 MPa,a yield-strength ratio is less than or equal to 0.75, (400 DEG C)Rp0.2 is greater than or equal to 337 MPa, and (-20 DEG C)Kv2 / J is greater than or equal to 133 J.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting and rolling, and in particular relates to a steel plate for a high-pressure heater and a manufacturing method thereof. Background technique [0002] The high-pressure heater is the key equipment in the thermal power station. It consists of two parts: the shell and the piping system. The steam condensing section is set on the upper part of the inner cavity of the shell, the drain cooling section is set on the lower part, and the water inlet and outlet are set on the top of the inlet and outlet pipes. . When the superheated steam enters the casing from the inlet, it can heat the feed water in the upper main coil, and after the steam condenses into water, the condensed hot water can heat part of the feed water in the lower cooling coil, and the condensed water after being used is passed through The hydrophobic outlet is drained out of the body. The main function is to improve the ef...

AI Technical Summary

Problems solved by technology

With the increase of installed capacity, power generation equipment also tends to be large-scale and modularized. The original low-grade steel grades such as 345Mpa grade can no longer meet the design and use requirements. For safety reasons, new higher-grade steel grades are required to replace them. , the use thickness is required to be more than 100mm, and the steel plate is required to have high room temperature strength, medium and high temperature strength, low yield ratio, low temperature impact toughness and excellent performance after forming

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