High-temperature solutionizing softening process for fine crystalline stainless steel pipe

A stainless steel tube, high-temperature softening technology, applied in the direction of manufacturing tools, furnaces, heat treatment equipment, etc., can solve the problems of loss, heavy workload, and many grinding steps, so as to reduce material loss, reduce follow-up processes, and improve work efficiency effect

Inactive Publication Date: 2011-11-02
JIANGSU WUJIN STAINLESS STEEL PIPE GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the high-temperature softening process in the production of finished pipes is to fully dissolve C and various alloy elements. However, because the temperature value of this process is higher than the conventional solid solution temperature, the oxide scale on the surface of the material is thicker and the loss is serious. Subsequent repairs There are many grinding steps, the workload is heavy, and the efficiency is low, which seriously affects the delivery date and yield of finished products

Method used

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  • High-temperature solutionizing softening process for fine crystalline stainless steel pipe
  • High-temperature solutionizing softening process for fine crystalline stainless steel pipe
  • High-temperature solutionizing softening process for fine crystalline stainless steel pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1 High-temperature softening process of fine-grained austenitic stainless steel pipe

[0020] When softening at high temperature, one end of the stainless steel tube is closed with a matching stainless steel cover, and the other end is filled with protective argon gas. After the inflation is completed, the other end is also closed with a matching stainless steel cover. The heat preservation temperature for high temperature softening is controlled at 1200°C-1280°C, and the heat preservation time for high temperature softening is ≥3.0min / mm (pipe wall thickness). During the heating process, there is a gap between the stainless steel tubes to ensure that they do not touch each other

Embodiment 2

[0021] Embodiment 2 compares the amount of thinning of the fine-grained austenitic stainless steel tube wall thickness prepared by different process conditions

[0022] Table 1 TP347HFG 63.5*4 prepared under different process conditions

[0023]

[0024]

[0025] Table 2 S30432 45*11 prepared under different process conditions

[0026]

[0027] Table 3 S30432 50.8*3.5 prepared under different process conditions

[0028]

[0029] The data in Table 1 and Table 2 show that when the protective gas is filled at high temperature softening, the amount of wall thickness reduction is greatly reduced, indicating that the oxidation of the inner wall of the steel pipe is reduced; controlling the heat preservation temperature can also further reduce oxidation and reduce the amount of wall thickness reduction.

[0030] Due to the reduction of oxidation, the production of steel pipes of the same specification can save raw materials. Calculated by using 350 tons of S30432 for a 6...

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PUM

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Abstract

The invention relates to a high-temperature softening process for fine crystalline stainless steel pipe for a supercritical power station unit. In the process, protective gas is filled into an inner cavity of the steel pipe in the high-temperature solutionizing process and the heat-preserving temperature and heat-preserving time are controlled; therefore, the oxidization of the internal surface of the steel pipe is reduced, the loss of materials is reduced, a subsequent process is reduced, and the work efficiency and yield rate are improved.

Description

technical field [0001] The invention relates to a high-temperature solid-solution softening process for a fine-grained stainless steel tube used in an ultra-supercritical power station unit. Background technique [0002] Thermal power generation accounts for more than 70% of my country's total power generation. The common thermal power plants currently in operation in my country have an average power generation efficiency of less than 35%, and a single coal consumption of more than 380 grams of standard coal; the power generation efficiency of subcritical units is around 38%. , The coal consumption of single electricity is about 350 grams of standard coal; the power generation efficiency of supercritical units is about 41%, and the coal consumption of single electricity is about 310 grams of standard coal; the power generation efficiency of ultra-supercritical units is about 48%, and the coal consumption of single electricity is about 265 grams of standard coal. If ultra-supe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/04C21D1/32
Inventor 宋建新章建新沈卫强
Owner JIANGSU WUJIN STAINLESS STEEL PIPE GRP
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