Dispersed precipitated phase strengthened austenitic stainless steel with high Cr and high Ni and thermal processing method

A technology of austenitic stainless steel and dispersion precipitation, which is applied in the field of materials to achieve the effect of improving anti-irradiation swelling performance, increasing high temperature strength and improving performance

Inactive Publication Date: 2013-06-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Dispersed precipitated phase strengthened austenitic stainless steel with high Cr and high Ni and thermal processing method

Examples

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Embodiment 1

[0020] Example 1: Austenitic steel containing Mn and Ti, W, V and Zr

[0021] The designed composition system is: Fe-22Cr-21Ni+0.6Ti+0.6Zr+0.5W+0.5V+1.5Mn+0.8Si+0.10C (wt.%). The raw material is a commercially pure alloy, which is smelted and poured according to the above method. Then it is forged into a rectangular parallelepiped at a high temperature of 950-1200°C, which is convenient for processing and testing. Using a forging ratio of 3:1, the sample size after forging is: 200mm×140mm×30mm. Then the forged steel samples were subjected to high-temperature rolling, the starting rolling temperature was 1190 °C, the final rolling temperature was above 1030 °C, and rolled in four passes. The total reduction rate of hot rolling was 80%. The samples processed by heat deformation were solution treated at 1150°C and held for 50 minutes; then quenched immediately; followed by high-temperature annealing at 1050°C, held for 3 hours, and then cooled in the furnace or air to room te...

Embodiment 2

[0023] Example 2 : Austenitic steel containing Mo and Ti, W, V and Zr

[0024] The designed composition system is: Fe-28Cr-18Ni+0.4Ti+0.4Zr+0.3Mo+0.3V+0.5Si+0.08C (wt.%). The raw material and smelting method are similar to the above method. The initial forging temperature is slightly higher than that of Example 1, and the sample size after forging is: 200mm×140mm×30mm. Then the forged steel samples were subjected to high-temperature rolling, the rolling temperature was 1200°C, the final rolling temperature was above 1030°C, rolled in four passes, the total reduction rate of hot rolling was 80%, and the rolling was directly quenched and quickly cooled. The samples processed by heat deformation were solution treated at 1180°C and held for 40 minutes; then quenched immediately; followed by high-temperature annealing at 1050°C, held for 3.5 hours, and then cooled in the furnace or air to room temperature. Compared with the commercial steel, the strength of the obtained sample ...

Embodiment 3

[0026] Example 3 : Austenitic steel containing Mn and a small amount of Ti, W, V and Zr

[0027] The raw materials and the smelting process are as described above. The designed composition system is: Fe-25Cr-20Ni+0.2Ti+0.2Zr+0.1W+0.15V+1.2Mn+0.6Si+0.1C (wt.%). Take about 1 / 3 of the above steel ingots for forging. The initial temperature of forging is 1180°C, the end temperature is 900°C, and the forging ratio is 3:1. The sample size after forging is: 200mm×140mm×35mm. Then the forged steel samples were subjected to high-temperature rolling, the rolling temperature was 1200°C, the final rolling temperature was above 1030°C, rolled in four passes, the total reduction rate of hot rolling was 80%, and the rolling was directly quenched and quickly cooled. The samples processed by heat deformation were solution treated at 1160°C and held for 60 minutes; then quenched immediately; followed by high-temperature annealing at 1050°C, held for 3.5 hours, and then cooled in the furnac...

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Abstract

The invention relates to dispersed precipitated phase strengthened austenitic stainless steel with high Cr and high Ni and a thermal processing method. The stainless steel component comprises the components in percentage by weight as follows: 0.2-0.8% of Si, not greater than 2% of Mn, 20-28% of Cr, 16-25% of Ni, not greater than 3% of Mo, 0-1% of Ti, 0-1% of W, 0-1% of Zr, 0-1% of V and the balance of Fe. The method comprises the following steps of: weighing according to the component proportion, refining and moulding; thermally forging, wherein the thermal rolling process is that rolling in four gates at 1180-1230 DEG C with the final rolling temperature over 1030 DEG C, wherein deformation is not less than 40% every time, and quenching and cooling; insulating for 20min to 1 hour at 1120-1200 DEG C; immediately quenching; performing high temperature annealing treatment at 950-1050 DEG C, insulating for 1.5-4 hours, then, furnace cooling or air cooling to room temperature, and directly quenching and quickly cooling. According to the invention, MC phase is separated out in the high temperature deformation process by comprehensively adding Ti, W, V, Zr and C elements. After thermal forming, relative materials are separated out through fine dispersion. Dimension of a second precipitated phase is controlled by the cooling rate through controlling subsequent thermal deformation processing parameters and the thermal treatment system.

Description

technical field [0001] The invention is suitable for materials under extreme service conditions, especially structural materials for fourth-generation supercritical water reactors; it is also suitable for the design and development of materials for ultra-supercritical coal-fired power generation systems. In particular, it provides an effective optimized way to improve the high-temperature performance of austenitic stainless steel materials. [0002] Background technique [0003] With the rapid development of the world economy and industry, high-performance materials are playing an increasingly important role, and austenitic stainless steel is one of the most popular materials. However, with the development of industry, the application of stainless steel is also facing challenges. Most of the new-generation nuclear energy systems represented by the fourth-generation reactors have the characteristics of high temperature and high pressure, strong radiation field and strong co...

Claims

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Application Information

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IPC IPC(8): C22C38/58C22C38/50C22C38/44C22C38/46C21D8/00
Inventor 周张健孙红英邹雷王曼
Owner UNIV OF SCI & TECH BEIJING
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