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ASTM A268 Grade S40800 Reheated – Premium Martensitic Stainless Steel

Properties

General

Property	Temperature	Value	Comment
Density	23.0 °C	7.6 - 7.7 g/cm³	Typical for Martensitic Stainless Steel

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	23.0 °C	220 GPa	Typical for Martensitic Stainless Steel
Elongation A50	23.0 °C	20 %
Hardness, Brinell	23.0 °C	207 [-]
Hardness, Rockwell B	23.0 °C	95 [-]
Poisson's ratio	23.0 °C	0.3 [-]	Typical for Martensitic Stainless Steel
Shear modulus	23.0 °C	77 GPa	Typical for Martensitic Stainless Steel
Tensile strength	23.0 °C	380 MPa
Yield strength	23.0 °C	205 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1E-5 - 1.5E-5 1/K	Typical for Martensitic Stainless Steel
Melting point		1370 - 1530 °C	Typical for Martensitic Stainless Steel
Specific heat capacity	23.0 °C	460 J/(kg·K)	Typical for Martensitic Stainless Steel
Thermal conductivity	23.0 °C	14 - 31 W/(m·K)	Typical for Martensitic Stainless Steel

Electrical

Property	Temperature	Value	Comment
Electrical resistivity	23.0 °C	6E-7 Ω·m	Typical for Martensitic Stainless Steel

Chemical properties

Property	Value
Carbon	0.08 %
Chromium	11.5 - 13 %
Manganese	1 %
Nickel	0.8 %
Phosphorus	0.05 %
Silicon	1 %
Sulfur	0.045 %
Titanium	1.1 %

ASTM A249 Grade TPXM‑15 – Heat‑Treated Austenitic Stainless Steel ASTM A268 Grade S40977 Reheated: Key Properties & Specifications

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