Composite manufacturing method for improving high-temperature oxidation resistance of valve rod of steam turbine
A technology of anti-high temperature oxidation and manufacturing method, applied in the direction of superimposed layer plating, ion implantation plating, coating, etc., can solve the problems of oxide skin shedding, accelerated high temperature oxidation of valve stem, valve jamming, etc., and achieve high performance Improves and improves antioxidant properties
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0036] (1) A plasma-based alloy powder is used to form a cobalt-based alloy powder, and a 1.0 mm thick cobalt-based pile of welding layer, a plasma-reducing process is formed on the surface of 12% CR martensite stainless heat-resistant steel valve stem. Technical parameters are current 140a, pulse welding time 700ms & residence time 300ms, welding speed 200 mm / min, overlink rate of 50%, feed powder 8g / mim; cobalt-based alloy is based on mass split, composed, carbon 0.40 %, 25.5% of chromium, 1.0%, manganese, 1.0%, nickel 10.0%, silicon 0.36%, tungsten 8.5%, margin is cobalt;
[0037] (2) 12% CR martensite stainless heat-resistant steel valve stem after step (1), 560 ° C, high temperature, pressure tempering treatment, heat insulation for 6 h, eliminates part of the heterogeneous metal fusion internal stress, the original The thickness is 1.6mm, and the remaining effective thickness is 1.0mm after approximately 0.6 mm, ensuring the machining to the valve stem final size + 0.08m...
Embodiment 2
[0041] (1) The plasma-binder is used, with a cobalt-based alloy powder, a 0.8 mm thick cobalt-based pile of welding layer formed in the GH901 alloy material valve stem surface, the technical parameter of the plasma surfacing process is current 130a, pulsed welding Time 700ms & stay time 300ms, welding speed 200 mm / min, overlink rate of 50%, powder distribution 7g / mim; cobalt-based alloy by mass fraction, composed of the following components, carbon 0.40%, chromium 25.5%, iron 1.0 %, Manganese 0.5%, molybdenum 1.0%, nickel, 0.36% silicon, 8.5% tungsten, margin is cobalt;
[0042](2) After the step (1), the GH901 alloy material valve stem is taken at 660 ° C for high temperature depletion, heat-insulation 6 h, eliminates part of the heterogeneous metal fusion internal stress, the original thickness of 1.4mm after the solder welding, the motor After the processing is about 0.6 mm, the remaining effective thickness is 0.8mm to ensure turning processing to the valve stem final size...
Embodiment 3
[0046] (1) A plasma-stained fabrication is equipped with a cobalt-based alloy powder, and a 1.2 mm thick cobalt-based stacuk layer, a plasma surfracting process is formed on the surface of 12% Cr martensite stainless heat-resistant steel valve stem. The technical parameters are current 145a, pulse welding time 700ms & residence time 200ms, welding speed 200 mm / min, overlink rate of 50%, powder distribution amount 9g / mim; cobalt-based alloy is based on mass fraction, composed of the following components, carbon 0.5%, chromium 24%, iron 1.3%, manganese, molybdenum 1.2%, nickel 9.5%, silicon 0.4%, tungsten, tungsten, tungsten, tungsten 7%, margin is cobalt;
[0047] (2) 12% CR martensite stainless heat-resistant steel material after step (1), 520 ° C, high temperature, rectification, heat-insulation 8 h, eliminate partial heterogeneous metal fusion internal stress, depiculation The original thickness is about 1.8mm, and the remaining effective thickness is 1.2mm after approximate...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Hardness | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More