Sealing surfacing layer in steam turbine valve and structure thereof

A technology of steam turbine and surfacing layer, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems such as cracking, and achieve the effects of strong field operability, convenient workshop production, and good weldability

Inactive Publication Date: 2019-09-03
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned problems in the prior art, the purpose of the present invention is to find a kind of sealing surfacing layer and its structure in the steam turbine valve, which is used to solve the problem of hard alloy parts in the steam turbine valve in the prior art running for a period of time. problem with cracking after time

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sealing surfacing layer in steam turbine valve and structure thereof
  • Sealing surfacing layer in steam turbine valve and structure thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The surfacing materials provided in the present invention are selected, and the corresponding contents of each element component in the surfacing materials are shown in Table 1. The selected surfacing material was surfacing on the 9-12% CrMoV steel base metal to form the surfacing layer sample 1# to test its manufacturability and weldability. The anti-wear, anti-corrosion, and oxidation performance tests were carried out on the surfacing layer sample 1#, and the corresponding index data were obtained. Comparing the performance index data of the surfacing layer sample 1# with the existing Stellite No. 21 material surfacing welding to form the performance index data of the surfacing layer sample 1*, it can be seen that the surfacing material in the present invention can effectively replace the existing surfacing material. The specific performance index data are shown in Table 2.

[0043] Table 1

[0044] element name Chemical Composition (Wt%) C ≤0.10 ...

Embodiment 2

[0049] According to the product requirements, the welding process evaluation of the surfacing layer material prepared in the present invention is carried out according to the ASMEⅨ standard. According to the standard requirements, the test plate is first welded, the welding material is the surfacing layer sample 1# in Example 1, and the base material is 9-12% CrMoV steel. Preheat to 150-250°C before welding, and perform post-weld heat treatment at 650-700°C after welding. Appearance and penetration non-destructive inspections were carried out on the test panels, and the inspection results were qualified. The destructive inspection of the test plate includes macroscopic inspection, hardness inspection and chemical composition inspection. No defects such as lack of fusion and pores were found in the macroscopic inspection, and the fusion with the base metal was good. The hardness and chemical composition were tested at the thickness of the surfacing layer, that is, 3-10mm. The...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
hardnessaaaaaaaaaa
hardnessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to view more

Abstract

The invention provides a sealing surfacing layer in a steam turbine valve. The sealing surfacing layer is composed of the following elements of, in percentage by mass, 0.008%-1.20% of Mn, 0.40%-7.50%of Fe, 45.00%-80.00% of Ni, 10.00%-30.00% of Cr, 2.00%-5.50% of Nb, and 4.00%-13.00% of Mo. The invention further provides a surfacing method of the sealing surfacing layer in the steam turbine valveand a structure of the sealing surfacing layer. According to the sealing surfacing layer in the steam turbine valve and the structure thereof provided by the invention, the problem that parts with surfacing hard alloy in the steam turbine valve are cracked after being operated for a period of time can be effectively solved, the process of surfacing is reduced, and the field operability is high.

Description

technical field [0001] The invention belongs to the technical field of welding technology, and relates to a steam turbine valve internal sealing surfacing layer and its structure. Background technique [0002] The surface of important parts in steam turbine valves is usually surfacing with hard alloy surfacing layer to effectively improve the surface's wear resistance, oxidation resistance, and solid particle erosion resistance. At present, in the manufacturing process of the steam turbine, there are many different methods for the surfacing welding materials of the parts with sealing requirements in the valve. For example, the base material of these parts of ultra-supercritical thermal power units is 9-12% Cr steel, and the material of the surfacing layer according to the application is Stellite No. 6 cemented carbide and Stellite No. 21 cemented carbide. [0003] According to decades of operating experience of multiple units, it is found that the probability of defects in ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K33/00
CPCB23K33/00B23K35/304
Inventor 刘霞李玉艳丁玉明赵海兴崔金鹏全威
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap