Heat treatment process for high-hardenability Martensitic stainless steel for moving blades

A martensitic stainless steel, high hardenability technology, applied in the heat treatment process of high hardenability martensitic stainless steel, the field of heat treatment process of martensitic stainless steel, can solve the problem of low product qualification rate, to reduce tissue stress , reduce volume expansion, and reduce tissue stress

Active Publication Date: 2012-04-18
沈阳科金特种材料有限公司
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  • Abstract
  • Description
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Problems solved by technology

The invention adopts a staged quenching process for the moving blades to solve the problem that the high-hardenability martensitic stainless steel used for the steam turbine moving blades is too low in the heat treatment process

Method used

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  • Heat treatment process for high-hardenability Martensitic stainless steel for moving blades
  • Heat treatment process for high-hardenability Martensitic stainless steel for moving blades
  • Heat treatment process for high-hardenability Martensitic stainless steel for moving blades

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Embodiment Construction

[0016] The present invention is further described in detail by means of examples.

[0017] attached figure 1 The specific technological process for the heat treatment of the high-hardenability martensitic stainless steel for moving blades according to the present invention has the following steps.

[0018] (1) After forging, the workpiece is air-cooled to 50-90°C and installed in a furnace, and then heated to 1120-1160°C (furnace temperature lower than 400°C) after 1-2 hours of uniform temperature for quenching treatment.

[0019] (2) After 8-10 hours of heat preservation, the first water quenching time is 30-60S, the effluent residence time is 35-70S, the second water quenching time is 20-50S, the effluent residence time is 50-100S, and the third The secondary water quenching time is 20-50S, and air-cooled after the water is discharged.

[0020] (3) Use a blower to blow the workpiece, and the workpiece rotates at the same time. After 30 to 50 minutes, the workpiece is coole...

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Abstract

A heat treatment process for high-hardenability Martensitic stainless steel for moving blades includes the following steps: (1) a forged workpiece is cooled to 50 DEG C to 90 DEG C by the air and loaded into a furnace, and the temperature is increased to 1120 DEG C to 1160 DEG C after 1 to 2 hours of constant temperature; (2) after the temperature is preserved for 8 to 10 hours, three times of water quenching are carried out; (3) the workpiece is blown by a fan, rotated and cooled to 250 DEG C to 280 DEG C, and cooling under cover is started; (4) the workpiece is cooled under cover to 100 DEGC, loaded into a furnace and tempered to remove stress, and the tempering temperature is between 650 DEG C and 680 DEG C; (6) the workpiece is taken out of the furnace, recooled to 200 DEG C by waterand then cooled to the room temperature by the air. The heat treatment process effectively meets the technical requirements of moving blades, also effectively controls the content of residual austenite, and guarantees the dimension stability of the moving blade workpiece, and more importantly, the heat treatment process solves the problems of deformation and cracks in heat treatment.

Description

technical field [0001] The invention relates to a heat treatment process of martensitic stainless steel, in particular to a heat treatment process of high hardenability martensitic stainless steel for moving blades, and belongs to the technical field of heat treatment of martensitic stainless steel for moving blades. Background technique [0002] At present, the materials of high hardenability martensitic stainless steel for steam turbine blades at home and abroad require very high strength and hardness indicators. During the heat treatment process, the quenching temperature is very high. After direct water cooling or oil cooling and tempering, Although the performance of some products can meet the performance requirements required by the product, many quenching cracks appear on the surface of the product after the above-mentioned heat treatment, and some cracks run through the entire product. There are also many hairlines on the surface of many products, resulting in a low p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D11/00C21D1/18
CPCY02P10/20
Inventor 李爱民赵忠刚萨仁格日乐李宁刘智勇岳景东刘莹刘晓书
Owner 沈阳科金特种材料有限公司
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