1. Overview of GH3128
GH3128 is a nickel-based alloy with tungsten and molybdenum solid solution strengthening and grain boundary strengthening with boron, cerium and zirconium.
It has high plasticity, high lasting creep strength, good oxidation resistance, stamping, welding and other properties.
Its comprehensive performance is superior to similar nickel-based solid solution alloys such as GH3044 and GH3536.
It is suitable for manufacturing the combustion chamber flame tube, afterburner shell, regulating plate and other high-temperature parts and components of aero-engines that work at 950ºC for a long time.
The main products are cold-rolled sheets, and hot-rolled sheets and bars can also be supplied , forgings, wire and pipe.
Chemical composition
C Cr Ni W Mo Al Ti
≤0.05 19.0~22.0 margin 7.5~9.0 7.5~9.0 0.40~0.80 0.4~0.80
Fe B Zr Ce Mn Si P S
≤ ≤ ≤ ≤ ≤ ≤ ≤ ≤
0.2 0.005 0.06 0.05 0.50 0.80 0.013 0.013
GH3128 process performance:
Relative density g/cm3 (8.81)
Melting point °C (1340)
Thermal conductivity λ/(W/m•ºC)(11.3(100ºC))
Specific heat J/kg·ºC(--)
Elastic Die GPa (208)
Shear modulus GPa (---)
Resistance μΩ·m (1.37)
Poisson's ratio(--)
Thermal expansion coefficient a/10-6ºC-1 (11.25(20~100ºC)).
Heat treatment process method (aging treatment)
Compressive strength σb/MPa (735)
Tensile strength σp0.2/MPa (--)
Tensile strength σ5/% (40)
Tensile strength HBS (--)
GH3128 Standard Specification for Materials
GJB1952-1994 "Specification for high temperature alloy cold-rolled sheet for aviation"
GJB2612-1996 "Specification for high temperature alloy cold drawing wire for welding"
GJB2612-1996 "Specification for high temperature alloy hot-rolled sheet for aviation"
GH3128 Ingredients
The main purpose of GH3128 (GH128)
·Aircraft engine combustion chamber flame tube, afterburner cover, regulating plate
·Parts of gas turbine combustor
· Turbine engine combustion chamber parts
·Afterburner parts
GH3128 alloy composition structure
The alloy has a single-phase austenitic structure in the heat-tempered condition, with a small amount of finely distributed TiN and M6C.
Process performance and regulations
1. The furnace temperature should not be higher than 700ºC during ingot forging, and the final forging temperature should exceed 900ºC.
2. The average grain size of the alloy is closely related to the deformation degree of the forging and the final forging temperature.
3. The alloy can be welded by argon arc welding machine, welding, seam welding and other methods.
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