| Application: | Industrial |
|---|---|
| Standard: | GB, ASTM |
| Purity: | >99.5% |
| Alloy: | Alloy |
| Powder: | Not Powder |
| Transport Package: | Wooden |
| Customization: |
|---|
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Audited Supplier GH44 is a solid-solution strengthened nickel-based anti-oxidation alloy with high plasticity and moderate thermal strength below 900°C, and excellent anti-oxidation.
GH44 material grade
GH44 (GH3044)
GH44 similar grades
ЗИ686, ХН60ВТ, ВЖ90 (Russia).
1.3 Technical standards for GH44 materials
GJB 2612-1996 "Specification for high temperature alloy cold drawing wire for welding"
GJB 1952-1994 "Specification for cold-rolled sheet of superalloy superalloy for aviation"
GJB 3020-1997 "Specification for superalloy ring blanks for aviation"
GJB 3165-1998 "Specification for hot-rolled and forged bars of superalloys for aerospace load-bearing parts"
GJB 3317-1998 "Specification for hot-rolled sheet of superalloy for aviation"
GJB 3318-1998 "Specification for hot-rolled strip of superalloy for aviation"
1.4 The chemical composition of GH44 is shown in Table 1-1
Table 1-1
C Cr Ni W Mo Al Ti
≤0.10 23.5~26.5 Margin 13.0~16.0 ≤1.50 ≤0.50 0.30~0.70
Fe M Si P S
not greater than not greater than not greater than not greater than not greater than
4.0 0.50 08.0 0.013 0.013
1.5 GH44 Heat Treatment System
The solution treatment temperature of hot-rolled and cold-rolled sheets and strips in the supply state is 1120~1160°C, air-cooled, and the material properties are tested in the supply state.
1.6 GH44 Variety Specifications and Status
We can supply δ4~14mm hot rolled sheet, δ0.5~4mm cold rolled sheet, δ0.1~0.8mm strip, diameter d0.3~10mm, d20~300mm bar and various diameter rings. Plates and strips are supplied after solution, pickling and trimming; wires are supplied in cold drawing, co-prosperity pickling or semi-hard state, and bars and forgings are supplied without heat treatment.
1.7 GH44 Melting and Casting Process
The alloy is smelted by electric arc furnace, non-vacuum induction furnace or vacuum induction furnace + electroslag remelting or vacuum arc remelting process.
1.8 GH44 application overview and special requirements
Alloys are used to make sheet metal stamping and welding structural parts for aero-engine combustion chambers and afterburners, as well as components such as mounting edges, ducts and guide vanes.
GH44 Physical and Chemical Properties
2.1 GH44 Thermal Properties
2.1.1 GH44 melting temperature range 1352~1375ºC
2.1.2 Thermal conductivity of GH44 See Table 2-1
Table 2-1
θ/°C 100 200 300 400 500 600 700 800 900 950
λ/(W/(m·C)) 11.7 13.0 14.2 15.9 17.2 18.4 19.7 21.8 24.7 25.1
2.1.3 Specific heat capacity of GH44 See Table 2-2
Table 2-2
θ/°C 100 200 300 400 500 600 700 800 900 1000
c/(J/(kg·C)) 440 461 482 503 524 545 545 566 587 629
2.1.4 GH44 Linear Expansion Coefficient See Table 2-3
Table 2-3
θ/°C 20~100 20~200 20~300 20~400 20~500 20~600 20~700 20~800 20~900 20~1000
α/10-6C-1 12.5 12.35 12.85 13.10 13.31 13.50 14.30 14.90 15.60 16.28
2.2 GH44 Density ρ=8.89g/cm3
2.3 GH44 electrical properties
2.4 GH44 Magnetic Energy Type
Alloy non-magnetic
2.5 GH44 chemical properties
The oxidation rate and intergranular oxidation depth of GH44 after 100h test in air medium are shown in Table 2-4
Table 2-4
θ/°C 900 1000 1100 1200
Oxidation rate/(g/m h) 0.0971 0.2050 0.4320 0.7880
Intergranular oxidation depth/mm 0.016 0.080 0.110 ---
3 GH44 Organizational Structure
After solid solution at 1200ºC, it is basically single-phase austenite and a small amount of MC and M23C6 carbides. After long-term aging at 700~900ºC. MC does not change much, and M23C6 is distributed in the grain boundary in a chain shape. With the increase of aging time, the amount of precipitation increases and the particles grow; at the same time, there is WCr solid solution in the grain and grain boundary to supplement the precipitation, which is granular and increases with aging time. Prolonged, the number gradually increased, and the size continued to grow.
Relevant technical standards stipulate that the grain size of the cold-rolled sheet in the supply state should be in the range of 4 to 8 grades.
4GH44 Process performance and requirements
4.1 Formability of GH44
4.1.1 The heating temperature of GH44 ingot forging shall be 1170ºC±10ºC, and the terminal temperature shall not be lower than 900ºC. The heating temperature of slab rolling is 1190±10ºC, the heating temperature of sheet hot rolling is 1130ºC±10ºC, and the final rolling temperature is not lower than 800ºC; the total reduction rate of sheet cold rolling is about 30%.
4.12 GH44 sheet has good stamping process performance. The limit deep drawing coefficient of the cold rolled sheet supply state is K limit = 2.06.
4.2 Heat treatment process of GH44 parts
The intermediate heat treatment temperature is 1140°C ± 10°C, heat preservation for 3~5min, and air cooling. The final heat treatment temperature is determined according to the working conditions of the parts. For parts that require good thermal fatigue properties, solid solution at 1150 °C, heat preservation for 3~5min, and air cooling; Air-cooled.
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