DIN 1651 Grade 35SPb20: Cold‑Drawn, Quenched & Tempered Steel for Precision Machining

The fully killed machining steel 35 SPb 20 is used for mass parts of mean strength, especially for lower toughness demands cross-sectional. Its better machinable because of the Pb addition. Application in the automotive engineering, toolbuilding, apparatus engineering (screws, nuts, smal parts).

Properties

General

Property	Temperature	Value
Density	20.0 °C	7.85 g/cm³

Mechanical

Property	Temperature	Value	Comment
Elastic modulus	20.0 °C	210 GPa
	200.0 °C	193 GPa
	300.0 °C	185 GPa
	400.0 °C	175 GPa

Elongation	20.0 °C	13 - 17 %
Poisson's ratio	23.0 °C	0.29 [-]	Typical for Medium Carbon Steel
Shear modulus	20.0 °C	81 GPa
Tensile strength	20.0 °C	540 - 760 MPa
Yield strength	20.0 °C	325 - 420 MPa

Thermal

Property	Temperature	Value	Comment
Coefficient of thermal expansion	100.0 °C	1.1E-5 1/K
	200.0 °C	1.18E-5 1/K
	400.0 °C	1.32E-5 1/K

Max service temperature		500 °C	Typical for Carbon Steel
Melting point		1380 - 1514 °C	Typical for Medium Carbon Steel
Specific heat capacity	20.0 °C	420 J/(kg·K)
	100.0 °C	490 J/(kg·K)
	200.0 °C	530 J/(kg·K)
	400.0 °C	610 J/(kg·K)

Thermal conductivity	20.0 °C	49 W/(m·K)

Electrical

Property	Temperature	Value
Electrical resistivity	20.0 °C	1.2E-7 Ω·m

Chemical properties

Property	Value
Carbon	0.32 - 0.39 %
Lead	0.15 - 0.35 %
Manganese	0.7 - 1.1 %
Phosphorus	0.06 %
Silicon	0.1 - 0.3 %
Sulfur	0.18 - 0.25 %

DIN 17245: GS-22Mo4 Quenched & Tempered Steel for High-Performance Turbine Parts DIN 1651 Grade 35SPb20: Turned, Quenched, and Tempered Steel for High-Performance Applications

Metal