EN 10270-2 Grade TDC: Oil‑Quenched & Tempered High‑Carbon Steel Wire

The round, oil hardened and tempered carbon steel wire TDC with medium fatigue strength and low tensile strength is used mainly for torsion loaded springs (tension and compression springs). It will be delivered in rings, in coils or as bars and, if not otherwise arranged, thin oiled.

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	20.0 °C	206 GPa
Poisson's ratio	23.0 °C	0.29 [-]	Typical for High Carbon Steel
Reduction of area	20.0 °C	38 - 50 %
Shear modulus	20.0 °C	79.5 - 81.5 GPa
Tensile strength	20.0 °C	1390 - 2000 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	0.6 - 0.75 %
Copper	0.1 %
Manganese	0.5 - 1.2 %
Phosphorus	0.02 %
Silicon	0.1 - 0.35 %
Sulfur	0.02 %

Technological properties

Property
Features	Spring

EN 10270-2 Grade FDC Oil Quenched & Tempered Wire – High‑Strength Spring Material EN 10270-2 Grade VDC: Premium Oil‑Quenched & Tempered Steel Wire for High‑Fatigue Torsion Springs

Metal