AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper, 100 mm (4 in.) round

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AISI 9255 Steel, oil quenched from 885°C (1625°F), 540°C (1000°F) temper, 100 mm (4 in.) round
Categories:	Metal; Ferrous Metal; Alloy Steel; AISI 9000 Series Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	Post oil quenched hardness 35.5 HRC surface, 31.5 HRC half-radius, 27.5 HRC center
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	Original Value	Comments

Density	7.85 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	293
Hardness, Knoop	319	Converted from Brinell
Hardness, Rockwell B	99	Converted from Brinell
Hardness, Rockwell C	31	Converted from Brinell hardness value.
Hardness, Vickers	309	Converted from Brinell hardness value.
Tensile Strength, Ultimate	1025 MPa
Tensile Strength, Yield	650 MPa
Elongation at Break	19.2 %	in 50 mm
Modulus of Elasticity	200 GPa	Typical for steel
Bulk Modulus	160 GPa	Typical for steel
Poissons Ratio	0.29	Calculated
Machinability	40 %	hot rolled and cold drawn. Based on 100% machinability for AISI 1212 steel.
Shear Modulus	80.0 GPa	Typical for steel

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000174 ohm-cm	Estimated

Thermal Properties	Original Value	Comments
CTE, linear	11.5 µm/m-°C @Temperature 20.0 °C	Estimated
	12.2 µm/m-°C @Temperature 250 °C	Estimated
	13.9 µm/m-°C @Temperature 500 °C	Estimated
	14.7 µm/m-°C @Temperature 1000 °C	Estimated
Specific Heat Capacity	0.472 J/g-°C	Estimated
Thermal Conductivity	51.9 W/m-K	Typical steel

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

References for this datasheet.

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M925AK / 8638

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