UNS N07718
As a leading supplier and manufacturer in China, GNEE Steel provides cost-effective nickel-based alloy products.
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UNS N07718 is a nickel-chromium alloy being precipitation hardenable and having high creep-rupture strength at high temperatures to about 1300 °F (700 °C). The poor age-hardening response of alloy 718 permits annealing and welding without spontaneous hardening during heating and cooling. This alloy has excellent weldability compared to the nickel-base super alloys hardened by Aluminum and Titanium.
| Chemical Composition | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Ni 52.5% | Cr 19.0% | Mo 3.05% | C | Nb 5.035% | |||||
| Mn | Si | P | S | Cu | |||||
| Co | |||||||||
| PHYSICAL PROPERTIES | |||||||
|---|---|---|---|---|---|---|---|
| Density | Electrical conductivity (% IACS) | Thermal conductivity (BTU-in/hr-ft²-°F) | Specific heat (BTU/lb-°F) | Thermal expansion (1/°F) | Thermal expansion | Melting Point (°F) | |
| 0.296 | 1.38 | 77 | 0.104 | 7.22E-06 | – | 2300 | |
| Mechanical Properties | ||
|---|---|---|
| Property | Minimum | Maximum |
| Yield Strength Range (Rp0.2 Offset) (ksi) | 80 | 150 |
| Tensile Strength Range (Rm) (ksi) | 14 | 220 |
| Elongation (AL=5 x Ø) | 18% | 27% |
| Brinell Hardness (H) | 102 | 331 |
| Modulus of Elasticity (ksi) (E): 29600 | ||
| Machineability General Index: 12% | ||
Corrosion Resistance:
UNS N07718 heat resistant alloy has excellent corrosion resistance to many media. This corrosion resistance is similar to that of other nickel-chromium alloys and is a function of its composition. Nickel contributes to corrosion resistance in many inorganic and organic compounds (except strongly oxidizing compounds) over a wide range of pH values.
It also contributes to resistance to chloride ion stress corrosion cracking. Chromium gives it resistance to attack by oxidizing media and sulfur-containing compounds. Molybdenum is known to contribute to resistance to pitting corrosion in many media.
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