DIN 1651 Grade 45SPb20 Cold Drawn, Quenched & Tempered Steel for High‑Strength Applications

The fully killed machining steel 45 SPb 20 is used for mass parts of higher 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	10 - 14 %
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	620 - 840 MPa
Yield strength	20.0 °C	375 - 480 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	100.0 °C	490 J/(kg·K)
	200.0 °C	530 J/(kg·K)
	400.0 °C	600 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	0.42 - 0.5 %
Lead	0.15 - 0.35 %
Manganese	0.7 - 1.1 %
Phosphorus	0.06 %
Silicon	0.1 - 0.3 %
Sulfur	0.18 - 0.25 %

DIN 1651 Grade 35SPb20 Cold Drawn Steel – High Machinability & Reliability DIN 1651 Grade 45SPb20 Steel: Turned, Quenched, and Tempered – Optimal for High-Strength Automotive Components

Metal