Stainless Steel Grade 418 (UNS S41800)

Topics Covered

Chemical Composition
Mechanical Properties
Other Designations


Stainless steel grade 418 is martensitic type of steel that has good corrosion resistance, high harness, toughness and strength.

The following datasheet provides an overview of stainless steel grade 418.

Chemical Composition

The chemical composition of grade 418 stainless steel is outlined in the following table.

Element Content (%)
Iron, Fe 82
Chromium, Cr 13
Tungsten, W 3
Nickel, Ni 2

Mechanical Properties

The mechanical properties of grade 418 stainless steel are displayed in the following table.

Properties Metric Imperial
Tensile strength 895 MPa 130000 psi
Yield strength (@strain 0.200 %) 725 MPa 105000 psi
Modulus of elasticity 190-210 GPa 27557- 30457 ksi
Poisson’s ratio 0.27-0.30 0.27-0.30
Elongation at break 15% 15%
Hardness, Rockwell C 25 25

Other Designations

Equivalent material to stainless steel grade 418 is SAE 51418.


The applications of stainless steel grade 418 are as follows:

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


  1. sai kiran sai kiran India says:

    you have to mention    "alloy 615"

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