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ASTM A437 Grade B4B: Properties of 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
Charpy impact energy	23.0 °C	14 J
Elastic modulus	23.0 °C	220 GPa	Typical for Martensitic Stainless Steel
Elongation A50	23.0 °C	13 %
Hardness, Brinell	23.0 °C	293 - 341 [-]
Hardness, Rockwell C	23.0 °C	31 - 37 [-]
Poisson's ratio	23.0 °C	0.3 [-]	Typical for Martensitic Stainless Steel
Reduction of area	23.0 °C	30 %
Shear modulus	23.0 °C	77 GPa	Typical for Martensitic Stainless Steel
Tensile strength	23.0 °C	1000 MPa
Yield strength Rp0.2	23.0 °C	720 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
Aluminium	0.05 %
Carbon	0.2 - 0.25 %
Chromium	11 - 12.5 %
Manganese	0.5 - 1 %
Molybdenum	0.9 - 1.25 %
Nickel	0.5 - 1 %
Phosphorus	0.03 %
Silicon	0.2 - 0.5 %
Sulfur	0.025 %
Tin	0.04 %
Titanium	0.05 %
Tungsten	0.9 - 1.25 %
Vanadium	0.2 - 0.3 %

ASTM A213 T91 Heat‑Tempered Alloy – Premium Grade T91 Steel ASTM A437 Grade B4C: Premium Martensitic Stainless Steel for High-Performance Applications

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