Alloy 718 API combines high strength with good corrosion resistance and weldability.
Alloy 718 API provides high strength while meeting the maximum hardness requirements of the NACE MR0175, MR0103 and ISO 15156-3 specifications for use in oil tools used for sour service.
| % | Ni | Cr | Mo | Mn | Cu | Si | C | S | P | Co | Cb+Ta | Pb | Se | B | Mg | Ti | Al | Fe |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 50 | 17 | 2.8 | - | - | - | - | - | - | - | 4.87 | - | - | - | - | 0.8 | 0.4 | - |
| Max | 55 | 21 | 3.3 | 0.35 | 0.23 | 0.35 | 0.045 | 0.01 | 0.01 | 1.0 | 5.2 | 1000ppm | 0.0005ppm | 50ppm | 0.0006ppm | 1.15 | 0.6 | Balance |
Alloy 718 API is widely used in the oil and gas industry. Where wells have high concentrations of hydrogen sulphide, carbon dioxide and chlorides at high pressures and temperatures, Alloy 718 API is the alloy of choice. This alloy demonstrates high resistance to chloride and sulphide stress corrosion cracking in addition to high strength and good corrosion resistance.
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| Mechanical & Physical Properties | 21°C | 93°C | 204°C | 316°C | 538°C | 649°C |
|---|---|---|---|---|---|---|
| Coefficient of Thermal Expansion µm/m⁰C | - | 13.4 | 13.5 | 13.9 | 14.6 | 15.1 |
| Thermal Conductivity /kcal/(hr.m.°C) | 9.5 | 10.7 | 12.2 | 13.8 | 16.8 | 18.3 |
| Modulus of Elasticity/ x105 MPa | 2 | 1.96 | 1.9 | 1.84 | 1.71 | 1.63 |
| Minimum | Maximum | |
|---|---|---|
| Ultimate tensile strength, ksi | 150 | - |
| 0.2% yield strength, ksi | 120 | 145 |
| Elongation, % | 20% | - |
| Reduction of area, % | 35% | - |
| Impact Strength*Min average/ min single, ft-lbs | 40/35 | - |
| Hardness, Rockwell C | 32 | 40 |
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