AISI 4042 Steel

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AISI 4042 Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 4000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Oil quenched. Forging temp.: 1230 °C (2250°F) max. Annealing temp.: 830°C - 925°C (max. hardness 183 HB). Normalizing temp.: 855 - 955°C (approx. hardness 235 HB). Hardening temp.: 830 - 855°C
Key Words:	alloy steels, UNS G40420, ASTM 322, ASTM A331, ASTM A519, SAE J404, SAE J412, SAE J770
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Physical Properties	Metric	English	Comments

Density	7.85 g/cc	0.284 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	179 - 229	179 - 229
Hardness, Knoop	226	226	Converted from Brinell
Hardness, Rockwell B	93	93	Converted from Brinell
Hardness, Rockwell C	14	14	Converted from Brinell hardness. Value below normal HRC range, for comparison purposes only.
Hardness, Vickers	214	214	Converted from Brinell
Modulus of Elasticity	205 GPa	29700 ksi	Typical for steel
Bulk Modulus	160 GPa	23200 ksi	Typical for steel
Poissons Ratio	0.29	0.29	Calculated
Machinability	65 %	65 %	annealed and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	80.0 GPa	11600 ksi	Typical for steel

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000245 ohm-cm	0.0000245 ohm-cm	Typical 4000 series steel

Thermal Properties	Metric	English	Comments
Specific Heat Capacity	0.475 J/g-°C	0.114 BTU/lb-°F	Typical 4000 series steel
Thermal Conductivity	44.5 W/m-K	309 BTU-in/hr-ft²-°F	Typical steel

Component Elements Properties	Metric	English	Comments
Carbon, C	0.40 - 0.45 %	0.40 - 0.45 %
Iron, Fe	97.93 - 98.55 %	97.93 - 98.55 %	As remainder
Manganese, Mn	0.70 - 0.90 %	0.70 - 0.90 %
Molybdenum, Mo	0.20 - 0.30 %	0.20 - 0.30 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	0.15 - 0.35 %	0.15 - 0.35 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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