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Heat treatment method for improving flaw detection sensitivity of 2Cr11Mo1VNbN stainless steel

A 2cr11mo1vnbn, flaw detection sensitivity technology, applied in the field of heat treatment, can solve the problem of low ultrasonic flaw detection sensitivity, and achieve the effect of improving sensitivity, avoiding precipitation, and eliminating cooling stress

Active Publication Date: 2014-01-01
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is: how to solve the problem of low sensitivity of ultrasonic flaw detection after conventional annealing treatment of 2Cr11Mo1VNbN stainless steel

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0007] The test steel type is 2Cr11Mo1VNbN ingot type, 3 tons of electroslag ingot (round ingot, average diameter of steel ingot: 500 rounds), forging equipment is 1800 tons of radial forging machine, and the forging specification is 152 round forgings. Immediately after forging, it is put into an annealing furnace for heat treatment. The specific implementation process method: the annealing furnace is heated to 600 °C in advance, and the forging material is hoisted into the heat treatment furnace with a spreader immediately after forging, and the 152 round forging material is directly loaded into the annealing furnace, and the heat treatment process is automatically input, and the temperature is kept at 850 °C with the furnace After 3 hours, hang out the water to cool for 20 seconds and then temper. The tempering process is as follows: heat up the furnace to 300 ° C for 5 hours, leave the furnace and air cool. After the above normalizing and tempering, the flaw detection sen...

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Abstract

The invention belongs to the field of heat treatment, in particular to a heat treatment method for improving the flaw detection sensitivity of 2Cr11Mo1VNbN stainless steel. The method comprises the following steps: after the completion of forging of a 2Cr11Mo1VNbN stainless steel forging, loading the forging into an annealing furnace, heating to 850 DEG C, performing heart preservation for 3 hours, and then performing water cooling; then performing tempering process processing, wherein the tempering process is that the temperature is raised to 300 DEG C, heat preservation is carried out for 5 hours, and then the temperature is reduced below 50 DEG C through air cooling. Due to the adoption of the heat treatment process, the supersonic flow detecting sensitivity is improved; moreover, precipitation of residue austenite phase is avoided, and the cooling stress is eliminated.

Description

technical field [0001] The invention belongs to the field of heat treatment, in particular to a heat treatment method for improving the flaw detection sensitivity of 2Cr11Mo1VNbN stainless steel. Background technique [0002] 2Cr11Mo1VNbN belongs to sinking martensitic stainless steel. This variety can be used as steam turbine blades. The internal quality of the finished product is strictly required. Ultrasonic flaw detection must be used. Less than ￠3.2. In fact, after the forging is completed, the peeling flaw detection after the conventional annealing process is normally used. When the ultrasonic flaw detection is used, there are too many grass-like waves, and the defect cannot be judged. Contents of the invention [0003] The technical problem to be solved by the invention is: how to solve the problem of low sensitivity of ultrasonic flaw detection after conventional annealing treatment of 2Cr11Mo1VNbN stainless steel. [0004] The technical solution adopted in the p...

Claims

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Application Information

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IPC IPC(8): C21D8/00
Inventor 乔小梅许立伟史普辑卫争艳李军
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD