Molybdenum alloy steel plate for pressure container and production method thereof

Abstract

The invention discloses a molybdenum alloy steel plate for pressure container and a production method thereof. The steel plate consists of the following components in percentage by weight: 0.22 to 0.26 percent of C, 0.35 to 0.45 percent of Si, 0.70 to 0.98 percent of Mn, less than or equal to 0.006 percent of P, less than or equal to 0.005 percent of S, 0.41 to 0.64 percent of Mo, 0.30 to 0.35 percent of Cr, 0.30 to 0.40 percent of Ni, 0.10 to 0.22 percent of Cu, less than or equal to 0.050 percent of V, less than or equal to 0.040 percent of Nb, less than or equal to 0.050 percent of Ti and the balance of Fe and unavoidable impurities. The production method comprises the processes of smelting, performing die casting, performing steel rolling and performing heat treatment. The steel plateprovided by the invention has high normal-temperature stretching, high-temperature stretching and low-temperature impact properties and excellent comprehensive property and completely meets design andmanufacturing of the steel plate for the pressure container with special requirements.

Description

technical field [0001] The invention relates to a molybdenum alloy steel plate for pressure vessels and a production method thereof, belonging to the technical field of iron and steel metallurgy. Background technique [0002] In order to meet the needs of petrochemical and coal chemical industry market, technology and production development, boilers and pressure vessels are becoming larger, heavier and more complex, and the requirements for their safety are becoming increasingly stringent. In order to cater to this development trend, the Design Institute put forward higher and more stringent technical requirements for the steel plate of the pressure vessel base material, some requirements such as J coefficient, X coefficient, Ceq carbon equivalent, negative temperature impact toughness and 550 ℃ high temperature tensile The performance is even close to or reach the limit level of steel plate. In order to meet the above stringent requirements, steel mills have to increase th...

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Problems solved by technology

In order to meet the above stringent requirements, steel mills have to increase the content of alloying elements on the basis of the original technical requirements, and this move will inevitably lead to an increase in production costs. How not to increase production costs, especially alloy costs, rolling and heat treatment costs, so that Obtaining steel plates with better intrinsic properties has become a major problem that steel mills urgently need to solve

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