GH4738 Alloy Bar
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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GH4738 is a Ni-Cr-Co precipitation hardening deformation high temperature alloy with a service temperature below 815℃. Cobalt, chromium and molybdenum are added to the alloy for solid solution strengthening, aluminum and titanium are added to form v phase, and boron and zirconium are added to purify and strengthen the grain boundaries. The alloy has high yield strength and fatigue resistance at 760℃~870℃; it has high oxidation resistance and corrosion resistance in gas turbine atmosphere below 870℃; it is suitable for making turbine disks, working blades, high temperature fasteners, flame tubes, shafts and turbine casings and other parts.
Chemical composition(mass fraction)(wt.%) of the GH4738
| Elements | Min.(≥) | Max.(≤) | Similar | Remarks |
|---|---|---|---|---|
| C | 0.03 | 0.10 | ||
| Cr | 18.0 | 21.0 | ||
| Mo | 3.5 | 5.0 | ||
| Ni | - | Remainder | ||
| Co | 12.0 | 15.0 | ||
| Al | 1.2 | 1.6 | ||
| Ti | 2.75 | 3.25 | ||
| B | 0.003 | 0.01 | ||
| Fe | - | 2.0 | ||
| Zr | 0.02 | 0.08 |
Mechanical properties of grade GH4738
| Yield Rp0.2 (MPa) |
Tensile Rm (MPa) |
Impact KV (J) |
Elongation A (%) |
Reduction in cross section on fracture Z (%) |
As-Heat-Treated Condition | HBW |
|---|---|---|---|---|---|---|
| 742 (≥) | 837 (≥) | 23 | 12 | 41 | Solution and Aging, Annealing, Ausaging, Q+T,etc | 312 |
Physical properties of grade GH4738
| Property | Density kg/dm3 |
Temperature T °C/F |
Specific heat J / kgK |
Thermal conductivity W/mK |
Electric resistance µΩ·cm |
|---|---|---|---|---|---|
| 684 (≥) | 868 (≥) | 14 | 24 | 11 | Solution and Aging, Annealing, Ausaging, Q+T,etc |
| Temp. °C/°F |
Creep strain limit (10000h) (Rp1,0) N/mm2 |
Creep rupture strength (10000h) (Rp1,0) N/mm2 |
- | - | - |
| 897 | 371 | 222 | - | - | - |
GH4738 Process Performance and Requirements
Mechanical properties: GH4738 has excellent mechanical properties, including tensile strength, yield strength and elongation. It can maintain high strength and good toughness at high temperatures.
Application fields: GH4738 is widely used in engineering fields under high temperature environments such as aviation, aerospace, energy, and chemical industry. For example, it can be used to manufacture high-temperature blades and gas turbines for aircraft engines.
Implementation standards: The implementation standards of GH4738 may vary according to the needs and application fields of different regions. Common implementation standards include AMS 5387, UNS N07718, etc.
Corrosion resistance: GH4738 has good corrosion resistance and can withstand erosion by a variety of corrosive media, including oxidizing and reducing media.
Typical engineering applications: GH4738 is often used in various engineering manufacturing fields under high temperature conditions, such as blades, turbine disks, combustion chamber components of aircraft engines, as well as petrochemical equipment, nuclear power plant equipment, etc.
Density: GH4738 has a density of approximately 8.2 g/cm³, which gives it a good strength-to-weight ratio and is suitable for applications that require high strength but not too heavy.
Physical properties: GH4738 has good thermal expansion, thermal conductivity and thermal stability at high temperatures, allowing it to maintain stable performance under extreme temperature conditions.
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