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Alloy 718 API

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.


Product form Size from Size to
Alloy 718 API round bar 12.7 mm 228.6 mm

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    Round Bar

Chemical Analysis

% 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


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Perfect for applications in the Thermal Processing industry

Alloy 718 API can be used in a variety of applications including:

  • Valves
  • Wellhead completion equipment
  • Fasteners
  • Blowout preventers (BOPs)
  • Tubing hangers
  • Mandrels

About Alloy 718 API

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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8.221 g/cm³
Melting range:


UNS Number:
Werkstoff Number:
NACE MR0175 / ISO 15156 -3
Download the Alloy 718 API Data Sheet Download

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