AISI 9255 Steel, annealed at 845°C (1550°F)

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AISI 9255 Steel, annealed at 845°C (1550°F)
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 9000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Key Words:	AFNOR 55 S 7, UNI 55 Si 8, SS14 2085 (Sweden), B.S. 250 A 53, UNS G92550, ASTM A322, ASTM A519, SAE J404, SAE J412, SAE J770, DIN 1.0904
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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	229	229
Hardness, Knoop	252	252	Converted from Brinell
Hardness, Rockwell B	96	96	Converted from Brinell
Hardness, Rockwell C	19	19	Converted from Brinell hardness. Value below normal HRC range, for comparison only.
Hardness, Vickers	241	241	Converted from Brinell hardness value.
Tensile Strength, Ultimate	770 MPa	112000 psi
Tensile Strength, Yield	490 MPa	71100 psi
Elongation at Break	21.7 %	21.7 %	in 50 mm
Modulus of Elasticity	200 GPa	29000 ksi	Typical for steel
Bulk Modulus	160 GPa	23200 ksi	Typical for steel
Poissons Ratio	0.29	0.29	Calculated
Machinability	40 %	40 %	hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	80.0 GPa	11600 ksi	Typical for steel
Izod Impact	9.00 J	6.64 ft-lb

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000174 ohm-cm	0.0000174 ohm-cm	Estimated

Thermal Properties	Metric	English	Comments
CTE, linear	11.5 µm/m-°C @Temperature 20.0 °C	6.39 µin/in-°F @Temperature 68.0 °F	Estimated
	12.2 µm/m-°C @Temperature 250 °C	6.78 µin/in-°F @Temperature 482 °F	Estimated
	13.9 µm/m-°C @Temperature 500 °C	7.72 µin/in-°F @Temperature 932 °F	Estimated
	14.7 µm/m-°C @Temperature 1000 °C	8.17 µin/in-°F @Temperature 1830 °F	Estimated
Specific Heat Capacity	0.472 J/g-°C	0.113 BTU/lb-°F	Estimated
Thermal Conductivity	51.9 W/m-K	360 BTU-in/hr-ft²-°F	Typical steel

Component Elements Properties	Metric	English	Comments
Carbon, C	0.51 - 0.59 %	0.51 - 0.59 %
Iron, Fe	96.185 - 96.99 %	96.185 - 96.99 %	As remainder
Manganese, Mn	0.70 - 0.95 %	0.70 - 0.95 %
Phosphorus, P	<= 0.035 %	<= 0.035 %
Silicon, Si	1.8 - 2.2 %	1.8 - 2.2 %
Sulfur, S	<= 0.040 %	<= 0.040 %

References for this datasheet.

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M925AB / 8629

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