post-welding heat treatment method of Cr-Mo steel pipe with strong gas flow in the pipe

Abstract

The invention provides a Cr-A Mo steel pipeline post-weld heat treatment method belong to that technical field of post-weld heat treatment, and comprises a post-weld heat treatment parameter determination module, a maximum heat treatment temperature deviation distance Delta S calculation module from the heat center, and a post-weld heat treatment implementation module; It can be used to guide theflow of Cr. In long pipe under the condition of high ambient wind speed or large pressure difference between two ends of pipe. Mo steel pipe post-weld heat treatment, to ensure that the whole weld andenough base metal are in the allowable heat treatment temperature window range, so as to ensure the quality of post-weld heat treatment and ensure Cr-Mo steel pipe components are used safely for a long time.

Description

technical field [0001] The invention belongs to the technical field of post-weld heat treatment, and provides a method for post-weld heat treatment of Cr-Mo steel pipes under the condition of strong air flow in the pipe, which can be used to guide the environment caused by high wind speed or large pressure difference at both ends of long pipes. The post-weld heat treatment of Cr-Mo steel pipes under the condition of strong air flow in the pipe ensures the quality of post-weld heat treatment. Background technique [0002] Cr-Mo steel is currently the most widely used type of heat-strength steel, and is widely used in chemical industry, electric power and other equipment that need to serve in harsh environments such as high temperature, high pressure and high corrosion. Cr-Mo steel needs post-weld heat treatment after welding to improve joint performance and relax welding residual stress. During the on-site post-weld heat treatment, but limited by the construction conditions,...

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Problems solved by technology

If the maximum temperature of heat treatment deviates from the center of the heater, the maximum heating temperature of heat treatment may exceed the upper limit of the allowable heat treatment temperature, so that austenite transformation occurs in these parts during heat treatment, and hard and brittle quenched martensite is formed after cooling, which seriously reduces the performance of joints

At present, there is no relevant report on the post-weld heat treatment method of Cr-Mo steel pipe under the condition of strong air flow in the pipe

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