| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
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Audited Supplier GH4220 Overview
GH4220 is an age-hardening alloy based on nickel-chromium-cobalt. More aluminum and titanium elements are added to the alloy to precipitate a large number of intermetallic compounds (the γ' phase content reaches more than 40%) for precipitation strengthening, and a large amount of tungsten and molybdenum are added. The elements are solid solution strengthened, and trace amounts of carbon, boron, and magnesium are added to strengthen the grain boundaries, so as to obtain a comprehensive strengthening effect. The alloy is a kind of high-alloying, high-performance hard-to-deform alloy, the main product is bar, suitable for making rotating parts such as aero-engine turbine blades working below 950ºC.
GH4220 technical standard
GJB 1953-1994 "Specification for hot-rolled hot-rolled bars of superalloy for rotating parts of aero-engine"
HB 5284-1984 "Technical Conditions for GH220 Alloy Hot Rolled Bars for Aviation"
GH4220 Chemical Composition
Chemical composition of GH4220:
C(%): ≤0.08
Cr(%): 9.0~12.0
Mo(%): 5.0~7.0
Ni(%): Margin
Co(%): 14.0~15.0
W(%): 5.0~6.5
Al(%): 3.9~4.8
Nb(%): -
Ti(%): 2.2~2.9
B(%): ≤0.02
Fe(%): ≤3.0
Mn(%): -
(%): V0.2~0.8Mg trace amount
GH4220 Heat Treatment System
1220ºC±10ºC, 4h, air cooling+1050ºC±10ºC, 4h, air cooling+950ºC±10ºC, 2h, air cooling.
GH4220 Melting and Casting Process
The alloy is smelted by vacuum induction plus vacuum arc remelting process or vacuum induction plus electroslag remelting process.
GH4220 application overview and special requirements
Turbine working blades made of this alloy have been tested on turbojet engines and have been put into production.
GH4220 Density ρ=8.36g/cm
GH4220 thermal processing technology
The steel ingot is directly rolled into bar by wrapping, the heating temperature is 1160-1180ºC, the final rolling temperature of the last fire is greater than 1020ºC, the last rolling pass is controlled at 2-4, and the blade die forging heating temperature is controlled at 1120 -1140ºC, the die forging process should be completed within 10s. The amount of deformation per fire is preferably 30%-40%. When the die forging blank is heated and heat treated in an air furnace, the machining allowance shall not be less than 1.5mm on each side.
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