M50-NiL High Performance Carburizing Bearing and Gear Steel

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M50-NiL High Performance Carburizing Bearing and Gear Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Carbon Steel; High Carbon Steel
Material Notes:	A carburizing bearing and gear steel designed for service temperatures up to 600°F. The chemistry is engineered such that when suitably carburized and heat treated the case will have a microstructure of fine tempered martensite with an even distribution of fine carbides. Improved over conventional through hardening M50 is the relatively high fracture toughness properties of the core. Because the alloy can be carburized, surface stresses can be controlled to provide excellent rolling contact fatigue characteristics. Information provided by Latrobe and the reference(s).
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Physical Properties	Metric	English	Comments

Density	7.86 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Modulus of Elasticity	203 GPa	29500 ksi
Fracture Toughness	31.9 - 36.3 MPa-m½	29.0 - 33.0 ksi-in½	cracks originating in case; case depth 0.30 to 0.35 in.
	41.8 - 49.4 MPa-m½	38.0 - 45.0 ksi-in½	cracks originating in core
Charpy Impact	30.0 - 50.0 J @Temperature -17.8 °C	22.1 - 36.9 ft-lb @Temperature 0.000 °F

Thermal Properties	Metric	English	Comments
CTE, linear	11.2 µm/m-°C @Temperature 21.0 - 204 °C	6.22 µin/in-°F @Temperature 69.8 - 399 °F
	12.0 µm/m-°C @Temperature 21.0 - 427 °C	6.67 µin/in-°F @Temperature 69.8 - 801 °F
Maximum Service Temperature, Air	316 °C	600 °F
Transformation Temperature	215 °C	419 °F	Martensitic Finish
	332 °C	630 °F	Martensitic Start

Processing Properties	Metric	English	Comments
Processing Temperature	738 °C	1360 °F	Critical Temperature Core Ac1
	960 °C	1760 °F	Critical Temperature Core Ac3

Component Elements Properties	Metric	English	Comments
Carbon, C	0.13 %	0.13 %
Chromium, Cr	4.2 %	4.2 %
Iron, Fe	86.37 %	86.37 %
Manganese, Mn	0.25 %	0.25 %
Molybdenum, Mo	4.25 %	4.25 %
Nickel, Ni	3.4 %	3.4 %
Silicon, Si	0.20 %	0.20 %
Vanadium, V	1.2 %	1.2 %

References for this datasheet.

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