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Stainless Steel Alloy 418 | UNS# S41800

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Stainless Steel Alloy 418: forms, specifications and uses

Stainless Steel Alloy 418 (UNS S41800): Stainless Steel Alloy AISI 418, also known as Greek Ascoloy, is part of the martensitic family of stainless steels specifically formulated for forming into wrought products.

Stainless Steel product forms offered at all Titanium Industries locations include Stainless Steel Round Bar and Stainless Steel Hex Bar.

Typical uses of Stainless Steel Alloy 418 include ducts, stiffeners, exhaust struts, engine braces and turbine exhaust components.

For Stainless Steel Alloy 418, request a quote online or contact your nearest Titanium Industries location. Alloy data on this page is for reference only, not for design.

Round bar, one of the stainless steel product forms Titanium Industries stocks, for Stainless Steel Alloy 418

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Stainless Steel Alloy AISI 418, also known as Greek Ascoloy, is part of the martensitic family of stainless steels specifically formulated for forming into wrought products. Properties are appropriate for the heat treated (HT) condition, it has a fairly high base cost among wrought martensitic stainless steels, demonstrates fairly high tensile strength and a moderately high embodied energy. Alloy 418 also shows good corrosion resistance, high hardness, toughness and strength.

Stainless Steel product forms offered at all Titanium Industries’ locations:

  • Stainless Steel Round Bar
  • Stainless Steel Hex Bar

Stainless Steel Alloy 418 Applications:

  • Ducts
  • Stiffeners
  • Exhaust struts
  • Engine braces
  • Turbine exhaust components

DISCLAIMER: Alloy data sheets are for reference only, not for design purposes.

Stainless Steel Alloy 418 | UNS# S41800 — Table 1
Chemical Composition
C 0.15 - 0.20% Cr 12.0 - 14.0% W 2.50 - 3.50% Ni 1.80 - 2.20% P 0.04% Max
S 0.03% Max Si 0.50% Max Mn 0.50% Max Fe Balance
Stainless Steel Alloy 418 | UNS# S41800 — Table 2
PHYSICAL PROPERTIES
Density (lb/ft3) Electrical conductivity (% IACS) Thermal conductivity (BTU/h-ft-°F) Specific heat capacity (BTU/lb-°F) Thermal expansion (µm/m-K)
500 2.8% 15 470 10
Stainless Steel Alloy 418 | UNS# S41800 — Table 3
Mechanical Properties
Property Minimum Maximum
Yield Strength Range (Rp0.2 Offset) (ksi) - 105
Tensile Strength Range (Rm) (ksi) - 130
Elongation (AL=5 x Ø) - 15.0%
Hardness, Rockwell (C) - 25
Modulus of Elasticity (ksi) (MPa): 30457
Machineability General Index: -

Stainless Steel Alloy 418: questions and answers

What is Stainless Steel Alloy 418?

Stainless Steel Alloy AISI 418, also known as Greek Ascoloy, is part of the martensitic family of stainless steels specifically formulated for forming into wrought products.

Which stainless steel product forms does Titanium Industries offer?

Stainless Steel Round Bar and Stainless Steel Hex Bar, at all Titanium Industries locations.

What is Stainless Steel Alloy 418 used for?

Ducts, stiffeners, exhaust struts, engine braces and turbine exhaust components.