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Method for obtaining ferritic heat-resisting steel with the characteristic of austenite structure

A ferritic and heat-resistant steel technology, applied in the field of heat-resistant steel, can solve the problems of high alloy content and high cost, and achieve the effects of less diffusion channels, inhibition of coarsening rate, and increase of service temperature

Active Publication Date: 2015-07-01
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of austenitic heat-resistant steel is that the alloy content is higher, and the cost is therefore higher

Method used

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  • Method for obtaining ferritic heat-resisting steel with the characteristic of austenite structure
  • Method for obtaining ferritic heat-resisting steel with the characteristic of austenite structure
  • Method for obtaining ferritic heat-resisting steel with the characteristic of austenite structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The composition of the ferritic heat-resistant steel is shown in Table 1. The heat-resistant steel was immediately quenched to room temperature after being kept at 1100°C for 60 minutes. Then temper at 780°C for 3 hours and air cool to room temperature. Example 1 is a traditional heat treatment system, in order to compare with the large deformation + heat treatment process of the present invention in Examples 2 and 3.

Embodiment 2

[0026] The composition of the ferritic heat-resistant steel is shown in Table 1. The heat-resistant steel is processed into a cylindrical sample of Φ8×15mm, and the large deformation + heat treatment process experiment is carried out on the Gleeble3800 thermal simulation testing machine. The steps are: / s heating to 1100°C, holding for 90min; then, cooling at 10°C / s to 600°C, holding for 10s, with deformation rate as 1s -1 Compression deformation is carried out, and the deformation amount is 70%. After the deformation is completed, it is quenched to room temperature immediately. Then temper at 750°C for 2 hours and air cool to room temperature.

Embodiment 3

[0028] The composition of the ferritic heat-resistant steel is shown in Table 1. The heat-resistant steel is processed into a cylindrical sample of Φ8×15mm, and the large deformation + heat treatment process experiment is carried out on the Gleeble3800 thermal simulation testing machine. The steps are: / s heating to 1150°C, holding for 40min; then, cooling at 10°C / s to 700°C, holding for 5s, with deformation rate as 1s -1 Compression deformation is carried out, and the deformation amount is 80%. After the deformation is completed, it is quenched to room temperature immediately. Then temper at 700°C for 4 hours and air cool to room temperature.

[0029] What embodiment 1 used is the traditional heat treatment process, as a comparison with the large deformation + heat treatment process of the present invention. What embodiment 2 and 3 used is the large deformation+heat treatment process of the present invention. The sample after the above heat treatment was analyzed by SEM and...

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Abstract

The invention relates to a method for obtaining ferritic heat-resisting steel with the characteristics of an austenite structure, and belongs to the technical field of heat-resisting steels. A large deformation+heat treatment process is adopted, and the technical parameters controlled in process steps are as follows: heating 9%-12% Cr steel to 1100-1200 DEG C at 20 DEG C / s, and keeping temperature for 30-120 minutes; then cooling to 500-800 DEG C at 10 DEG C / s, keeping the temperature for 3-15 seconds, deforming at the deformation rate of 1s<-1> and the deformation amount of 70%-90%, immediately quenching to room temperature after the deformation is completed; then tempering at 650-800 DEG C for 1-5 hours, and air-cooling to room temperature. The method disclosed by the invention is used for preparing the 9%-12% Cr steel and a large-caliber boiler pipe thereof. According to the invention, the initial size of a precipitated phase is obviously thinner than the initial size of a precipitated phase treated through the traditional heat treatment mechanism, a ferrite structure has characteristics similar to the characteristics of the austenite structure, belongs to an equilibrium state and is small in interface quantity and less in diffusion channel; a base body has good structure stability in a long-time service process.

Description

technical field [0001] The invention belongs to the technical field of heat-resistant steel, and in particular provides a method for obtaining ferritic heat-resistant steel with austenite structure characteristics, which can be used for the preparation of 9-12% Cr steel and large-diameter boiler tubes thereof. Background technique [0002] In recent years, the demand for construction of ultra-supercritical thermal power plants has increased rapidly. With the increase of steam temperature and pressure, ultra-supercritical thermal power units have put forward higher requirements for the performance of heat-resistant materials, mainly in the following aspects: (1) Higher high temperature durability and creep strength; (2) excellent structural stability; (3) good cold and hot processing performance; (4) good oxidation resistance and corrosion resistance; (5) good welding performance, etc. . [0003] 9-12%Cr steel has low alloy content and great cost advantages. At the same time...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D8/00C21D1/18
Inventor 刘正东严鹏包汉生杨钢翁宇庆干勇
Owner CENT IRON & STEEL RES INST
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