EN 10277-3 Grade 46SPb20 – Quenched, Tempered & Cold Drawn (QT+C) – Premium Free‑Cutting High‑Strength Steel

The free cutting case hardening steel 46SPb20 is used for bulk parts of higher strength, especially for lower ductility demands in transversal direction compared to other C-steels (e.g. C45). Machinability enhancement is achieved by Pb-content. Application in car industry, apparatus, equipment and machine engineering (e.g. screws, nuts, small-size parts). As a bright steel product it is used in the form of bars, bright, straight, in various conditions (see DIN EN 10277 : 1999-10).

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	8 - 11 %
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	650 - 1000 MPa
Yield strength Rp0.2	20.0 °C	455 - 680 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	0.4 %
Sulfur	0.15 - 0.25 %

EN 10277-3 Grade 46SPb20 Cold Drawn Steel – High Strength, Low Ductility, Pb‑Enhanced Machinability EN 1564 Grade GJS-1000-5 Austempered Cast Iron – Superior Strength & Ductility

Metal