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Heat treatment method capable of improving room-temperature impact toughness of austenitic heat-resistant steel after aging

A technology of austenitic heat-resistant steel and heat treatment method, which is applied in the field of heat treatment to improve the room temperature impact toughness of austenitic heat-resistant steel after aging, and can solve the problem of the reduction of the impact toughness at room temperature of the material, shortening the service life of unit components, and affecting the safe operation of the unit. and other problems, to achieve the effect of improving impact toughness, improving impact toughness drop, and improving room temperature impact toughness performance.

Active Publication Date: 2017-08-18
HUANENG POWER INTERNATIONAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After long-term aging in many austenitic heat-resistant steels, the grain boundary carbides grow rapidly and form a network distribution, which will reduce the bonding force of the grain boundaries and greatly reduce the room temperature impact toughness of the material.
This phenomenon will seriously affect the safe operation of the unit and shorten the service life of the unit components

Method used

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  • Heat treatment method capable of improving room-temperature impact toughness of austenitic heat-resistant steel after aging
  • Heat treatment method capable of improving room-temperature impact toughness of austenitic heat-resistant steel after aging
  • Heat treatment method capable of improving room-temperature impact toughness of austenitic heat-resistant steel after aging

Examples

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example 1

[0039] The present invention is a heat treatment method for improving the room temperature impact toughness of austenitic heat-resistant steel after aging, comprising the following steps,

[0040] Step 1, heating the austenitic heat-resistant steel to 1230°C;

[0041] Step 2, keeping the heated austenitic heat-resistant steel at 1230°C for 20 minutes;

[0042] Step 3, cooling the heat-preserved austenitic heat-resistant steel to 1080°C at a cooling rate of 4°C / min;

[0043] Step 4, cooling the austenitic heat-resistant steel down to 1080°C in water to room temperature.

[0044] Among them, the chemical composition of the austenitic heat-resistant steel in this example is shown in Table 2.

[0045] Table 2 The chemical composition of the austenitic heat-resistant steel in Example 1 (mass%, the balance is Fe).

[0046] Ni Cr Nb Si N C B Zr P co V Ce 19 24 0.6 0.3 0.18 0.1 0.002 0.002 0.02 4.6 0.1 0.005

[0047] The sample in this e...

example 2

[0054] The present invention is a heat treatment method for improving the room temperature impact toughness of austenitic heat-resistant steel after aging, comprising the following steps,

[0055] Step 1, heating the austenitic heat-resistant steel to 1220°C;

[0056] Step 2, keeping the heated austenitic heat-resistant steel at 1220°C for 25 minutes;

[0057] Step 3, cooling the heat-preserved austenitic heat-resistant steel to 1100°C at a cooling rate of 5°C / min;

[0058] Step 4, cooling the austenitic heat-resistant steel down to 1100°C in water to room temperature.

[0059] Among them, the chemical composition of the austenitic heat-resistant steel in this example is shown in Table 2.

[0060] Table 2 The chemical composition of the austenitic heat-resistant steel in Example 1 (mass%, the balance is Fe).

[0061] Ni Cr mn Nb Si N C B Zr P co V Ce 17 25 2.0 0.6 0.75 0.15 0.04 0.002 0.002 0.03 4.6 0.1 0.005

example 3

[0063] The present invention is a heat treatment method for improving the room temperature impact toughness of austenitic heat-resistant steel after aging, comprising the following steps,

[0064] Step 1, heating the austenitic heat-resistant steel to 1240°C;

[0065] Step 2, keeping the heated austenitic heat-resistant steel at 1240°C for 15 minutes;

[0066] Step 3, cooling the heat-preserved austenitic heat-resistant steel to 1060°C at a cooling rate of 3°C / min;

[0067] Step 4, cooling the austenitic heat-resistant steel down to 1060°C in water to room temperature.

[0068] Among them, the chemical composition of the austenitic heat-resistant steel in this example is shown in Table 2.

[0069] Table 2 The chemical composition of the austenitic heat-resistant steel in Example 1 (mass%, the balance is Fe).

[0070] Ni Cr mn Nb Si N C B Zr P co V Ce 23 26 1.0 0.2 0.1 0.35 0.07 0.002 0.002 0.01 4.6 0.1 0.005

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Abstract

The invention provides a heat treatment method capable of improving the room-temperature impact toughness of austenitic heat-resistant steel after aging. The heat treatment method is capable of effectively reducing the declining amplitude of the impact toughness after the aging, improving the impact toughness of the heat-resistant steel after the aging, and providing guarantee on the safe running of a power plant unit. The heat treatment method comprises the following steps: step 1, heating the austenitic heat-resistant steel to 1220-1240 DEG C; step 2, insulating the heat of the heated austenitic heat-resistant steel for 15-25min at 1220-1240 DEG C; step 3, cooling the heat-insulated austenitic heat-resistant steel to 1060-1100 DEG C at a cooling speed of 3-5 DEG C / min; and step 4, water-cooling the austenitic heat-resistant steel cooled to 1060-1100 DEG C to room temperature. The heat treatment method provided by the invention achieves the purposes of separating out a second phase and generating a certain amount of serrated grain boundaries through controlling a heat treatment temperature, a heat-insulation time and a cooling speed, so that performance optimization is realized.

Description

technical field [0001] The invention relates to the technical field of heat treatment of austenitic heat-resistant steel, in particular to a heat treatment method for improving impact toughness at room temperature of austenitic heat-resistant steel after aging. Background technique [0002] Due to my country's rich coal resources, thermal power has long occupied a dominant position in my country's energy structure. Studies have shown that thermal power will still maintain a relatively high proportion in the next 20 years. In the field of coal-fired power generation, increasing the temperature and pressure of steam at the same time is the key to improving the thermal efficiency of generating units, which can effectively save coal consumption, reduce harmful gas emissions, and achieve the goal of environmental friendliness. [0003] In 600°C ultra-supercritical thermal power units, and even higher-parameter units, high-Cr austenitic heat-resistant steels are widely used in the...

Claims

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Application Information

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IPC IPC(8): C21D6/00
CPCC21D6/004C21D6/005C21D6/007C21D6/008C21D2201/00C21D2211/001
Inventor 朱传志袁勇尹宏飞党莹樱赵新宝严靖博杨珍鲁金涛周永莉黄锦阳
Owner HUANENG POWER INTERNATIONAL
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