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EN 10277-2: ZSt70-2 Steel – High-Strength, Wear-Resistant Turned Components

ZSt 70-2 is a bright drawn steel grade for wear and strength loaded parts (bolts, shafts, spindles, springs).

Properties

General

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

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	23.0 °C	200 - 215 GPa	Typical for High Carbon Steel
Elongation	20.0 °C	8 - 9 %
Poisson's ratio	23.0 °C	0.29 [-]	Typical for High Carbon Steel
Shear modulus	23.0 °C	81 GPa	Typical for High Carbon Steel
Tensile strength	20.0 °C	670 - 830 MPa
Yield strength	20.0 °C	305 - 325 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	23.0 °C	1.32E-5 1/K	Typical for High Carbon Steel
Max service temperature		500 °C	Typical for Carbon Steel
Melting point		1289 - 1478 °C	Typical for High Carbon Steel
Specific heat capacity	23.0 °C	486 J/(kg·K)	Typical for High Carbon Steel
Thermal conductivity	23.0 °C	36 W/(m·K)	Typical for High Carbon Steel

Electrical

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

Chemical properties

Property	Value
Carbon	0.5 %
Phosphorus	0.05 %
Sulfur	0.05 %

EN 10277-2 Grade ZSt70-2: High-Performance Cold-Drawn & Normalized Steel for Wear-Resistant Applications EN 10132-4 Grade C100S Cold Rolled Steel (+CR) – Premium Springs & Precision Applications

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