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 effect of strengthening, coarsening rate suppression, and good structural stability

Active Publication Date: 2014-02-05
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 Applications(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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