1. Introduction of GH4742:
GH4742 is a Ni-Cr-Co-based precipitation hardening deformed superalloy with a service temperature of less than 800 degrees Celsius. The alloy has high durability and creep strength in the range of 550-800 degrees Celsius, good comprehensive properties, and has good microstructure stability and corrosion resistance.
2. GH4742 application and features:
GH4742 is used to manufacture high temperature bearing parts of engines and marine gas turbines, such as high-pressure compressor discs, turbines, discs, sealing tooth discs, bearing rings and fasteners. The alloy has good corrosion resistance.
3. Chemical composition of GH4742:
C Si Mn P S Cr
0.04-0.08 ≤0.3 ≤0.4 ≤0.015 ≤0.01 13-15
Ni Mo Co Cu Fe Nb
Remaining 4.5-5.5 9-11 - ≤1 2.4-2.8
B Ti Al La W Ce
≤0.01 2.4-2.8 2.4-2.8 ≤0.1 - ≤0.01
4. GH4742 physical properties:
Density g/cm³: 8.23
Magnetic: None
Thermal Conductivity/w/(m.k)25-900ºC: 8.5-23.6
ResistivityºC)/(Ω.mm2/m)100ºC:
Specific Heat CapacityºC)/kg/(kg.k)ºC100-900ºC:0.431-0.638
Linear Expansion Coefficient/(10-6/k)20-700ºC:14.3
Temperature 0/ºC 20 650 750
Elastic modulus E/GPa 201 180 172
5 GH4742 mechanical properties:
Variety Heat Treatment Temperature 0/°C Tensile Strength Σb\MPa Elongation A/%≥ Section Shrinkage Z/%≥
Hot Rolled Rod Aging 800 1300 18 18.3
6, GH4742 processing and welding performance:
There are no special requirements for alloy cutting.
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