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2cr12niw1mo1v material steam turbine nozzle boronizing method

A steam turbine and boronizing technology, which is applied in the boronizing field of steam turbine nozzles made of 2Cr12NiW1Mo1V, can solve the problems of matrix toughness and strength decline, achieve the effects of eliminating internal stress and lattice distortion, inhibiting grain coarsening, and reducing growth speed

Active Publication Date: 2022-08-09
北京国能龙威发电技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the above-mentioned problems in the prior art, the present invention provides a boronizing method for steam turbine nozzles made of 2Cr12NiW1Mo1V. By designing an appropriate heat treatment process in the boronizing process, the coarsening of matrix austenite grains in the boronizing process can be controlled. In order to achieve the purpose of boronizing and strengthening the nozzle surface, and solve the problems of matrix toughness and strength reduction caused by the coarsening of matrix structure grains during high-temperature boriding

Method used

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Examples

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Embodiment 1

[0080] A steam turbine nozzle group, the material is 2Cr12NiMo1W1V stainless steel, in a quenched and tempered state, the content of silicon in the material is ≤ 0.35wt%, and the external dimensions are Φ1375XΦ810X175. according to Figure 4 , Figure 5 The process requires boronizing and tempering.

Embodiment 2

[0082] A set of 2Cr12NiMo1W1V test blocks (10*cm10cm*50cm), in a quenched and tempered state, the content of silicon in the material is ≤0.35wt%, the test blocks are placed in a boronizing box for boronizing treatment, the basic process of boronizing refers to the above process, but the specific Process parameters according to Image 6 and Figure 7 requirements.

[0083] After the boronizing is completed in Example 1 and Example 2, the detection conditions are as follows:

[0084] 1) The mechanical properties of the matrix are shown in Table 1.

[0085] 2) See Table 2 for the depth, hardness and microstructure of the boronized layer.

[0086] 3) The quality of the boronizing layer: There are no looseness and holes in the infiltrating layer in Example 1 and Example 2; there is no ferrite soft band between the infiltrating layer and the substrate. The boronizing layer of Example 1 was corroded with nitric acid alcohol, the depth of the infiltrating layer was 0.06mm, and the...

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Abstract

The invention relates to a method for boronizing a nozzle of a steam turbine made of 2Cr12NiW1Mo1V material, comprising: S1: installing a nozzle group on a boronizing tooling base plate, and filling the steam passage of the nozzle group with a boronizing agent; S2: placing the nozzle group together with the tooling as a whole for heat treatment Furnace, carry out boronizing heat treatment, in the boronizing heat treatment, the following operations are included: S21: the nozzle group is heated to 600-650 ℃ and then kept for 2-6h for the first preheating; S22: 180-230 ℃ / h Heat to 750‑800℃ at a speed of 1‑4h, and then perform the second preheating; S23: Heat to 1000‑1040℃ at a speed of 180‑230℃ / h, hold for 1‑2h, and then furnace cool to 965‑ 980 ℃, and then keep the temperature for 6-10h, and then carry out the formal boronizing; S3: Cooling: After the boronizing heat treatment of the nozzle group is completed, the furnace is cooled; S4: Tempering: The internal stress is eliminated by the tempering treatment, and the boronizing of the 2Cr12NiW1Mo1V material steam turbine nozzle is completed. The invention solves the problem of coarsening of crystal grains of the nozzle base under high temperature conditions while realizing the high-quality boronized layer obtained by the nozzle group, and achieves the goal of strengthening the surface and improving the microstructure and performance of the base.

Description

technical field [0001] The invention relates to the field of steam turbine manufacturing, in particular to a method for boronizing a 2Cr12NiW1Mo1V material steam turbine nozzle. Background technique [0002] Domestic 300MW and 600MW steam turbine units have gradually become the main domestic units. This part of the nozzle group is generally made of 2Cr12NiW1Mo1V material (heat-resistant stainless steel). Solid particle erosion is one of the main problems faced by this type of steam turbine. Due to the high steam parameters of this type of unit, the thermal system produces more solid particles, and the high-temperature flow-through part of the steam turbine, such as the nozzle group of the high-pressure regulating stage, is easily damaged by the impact of solid particles, resulting in a reduction in the flow-through efficiency of the steam turbine, a decrease in power, and a shortened time period. The overhaul cycle of the steam turbine increases the maintenance cost. Most f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C8/70C21D1/18C21D9/00
CPCC23C8/70C21D1/18C21D9/0068C21D9/0062
Inventor 冀冰峰杨存陈永杰马振全赵丽华薛飞
Owner 北京国能龙威发电技术有限公司
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