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ASTM A678 Grade B Quenched & Tempered Steel – High-Performance Low‑Carbon Alloy

Properties

General

Property	Temperature	Value	Comment
Density	23.0 °C	7.8 - 7.9 g/cm³	Typical for Low Carbon Steel

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	23.0 °C	200 - 215 GPa	Typical for Low Carbon Steel
Elongation A50	23.0 °C	22 %
Poisson's ratio	23.0 °C	0.29 [-]	Typical for Low Carbon Steel
Shear modulus	23.0 °C	82 GPa	Typical for Low Carbon Steel
Tensile strength	23.0 °C	550 - 690 MPa
Yield strength	23.0 °C	415 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.32E-5 - 1.38E-5 1/K	Typical for Low Carbon Steel
Max service temperature		500 °C	Typical for Carbon Steel
Melting point		1480 - 1526 °C	Typical for Low Carbon Steel
Specific heat capacity	23.0 °C	465 J/(kg·K)	Typical for Low Carbon Steel
Thermal conductivity	23.0 °C	25 - 93 W/(m·K)	Typical for Low Carbon Steel

Electrical

Property	Temperature	Value	Comment
Electrical resistivity	23.0 °C	1.43E-7 - 1.74E-7 Ω·m	Typical for Carbon Steel

Magnetic

Property	Value	Comment
Curie temperature	770 °C	Typical for Low Carbon Steel

Chemical properties

Property	Value
Carbon	0.2 %
Chromium	0.25 %
Copper	0.2 - 0.35 %
Manganese	0.7 - 1.36 %
Molybdenum	0.08 %
Nickel	0.25 %
Phosphorus	0.04 %
Silicon	0.15 - 0.5 %
Sulfur	0.04 %

ASTM A524 Grade II – Hot Finished or Cold Drawn Steel Specifications ASTM A958 SC1025 65/35 Heat‑Treated Low Carbon Steel – High Strength

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