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ASTM A479 Grade XM-18 Annealed: Key Properties of High-Strength Austenitic Stainless Steel

Properties

General

Property	Temperature	Value	Comment
Density	23.0 °C	7.9 - 8.2 g/cm³	Typical for Austenitic Stainless Steel

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	23.0 °C	195 GPa	Typical for Austenitic Stainless Steel
Elongation A50	23.0 °C	40 %
Hardness, Brinell	23.0 °C	212 [-]
Poisson's ratio	23.0 °C	0.3 [-]	Typical for Austenitic Stainless Steel
Reduction of area	23.0 °C	50 %
Shear modulus	23.0 °C	77 GPa	Typical for Austenitic Stainless Steel
Tensile strength	23.0 °C	620 MPa
Yield strength Rp0.2	23.0 °C	345 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.7E-5 - 1.9E-5 1/K	Typical for Austenitic Stainless Steel
Melting point		1230 - 1480 °C	Typical for Austenitic Stainless Steel
Specific heat capacity	23.0 °C	440 J/(kg·K)	Typical for Austenitic Stainless Steel
Thermal conductivity	23.0 °C	11 - 21 W/(m·K)	Typical for Austenitic Stainless Steel

Electrical

Property	Temperature	Value	Comment
Electrical resistivity	23.0 °C	8.5E-7 Ω·m	Typical for Austenitic Stainless Steel

Chemical properties

Property	Value
Carbon	0.03 %
Chromium	17.5 - 20.5 %
Manganese	7.5 - 9 %
Molybdenum	2 - 3 %
Nickel	5 - 7 %
Nitrogen	0.25 - 0.5 %
Phosphorus	0.05 %
Silicon	1 %
Sulfur	0.03 %

ASTM A469 Grade 6 – Quenched, Tempered & Stress‑Relieved Stainless Steel ASTM A469 Grade 7 Quenched & Tempered, Stress‑Relieved Martensitic Stainless Steel – Key Properties

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