Component    Wt. % 


C 0.31 - 0.38 
Fe 98.63 - 99.09 
Mn 0.6 - 0.9 
P Max 0.04 
S Max 0.05 


Material Notes:
Water-hardening steels suitable for small parts of moderate strength. Used in levers, bolts, nuts, studs, and similar parts which are headed, upset, or extruded.


Physical Properties Metric English Comments


Density 7.85 g/cc 0.284 lb/in³ 

Mechanical Properties


Hardness, Brinell 183 183 
Hardness, Knoop 204 204  Converted from Brinell hardness.
Hardness, Rockwell B 89 89  Converted from Brinell hardness.
Hardness, Vickers 192 192  Converted from Brinell hardness.
Tensile Strength, Ultimate 585 MPa 84800 psi 
Tensile Strength, Yield 370 MPa 53700 psi 
Elongation at Break 30 % 30 %  In 50 mm
Reduction of Area 53 % 53 % 
Modulus of Elasticity 205 GPa 29700 ksi  Typical for steel
Bulk Modulus 140 GPa 20300 ksi  Typical for steel
Poisson's Ratio 0.29 0.29  Typical For Steel
Machinability 65 % 65 %  Based on AISI 1212 steel. as 100% machinability
Shear Modulus 80 GPa 11600 ksi  Typical for steel

Electrical Properties


Electrical Resistivity 1.63e-005 ohm-cm 1.63e-005 ohm-cm  annealed specimen; 0°C (32°F)
Electrical Resistivity at Elevated Temperature 2.17e-005 ohm-cm 2.17e-005 ohm-cm  annealed specimen; 100°C (212°F)

Thermal Properties


CTE, linear 20°C 11 µm/m-°C 6.11 µin/in-°F 
CTE, linear 250°C 12.6 µm/m-°C 7 µin/in-°F 
CTE, linear 500°C 13.9 µm/m-°C 7.72 µin/in-°F 
Specific Heat Capacity 0.486 J/g-°C 0.116 BTU/lb-°F  annealed; 50-100°C (122-212°F)
Specific Heat Capacity at Elevated Temperature 0.519 J/g-°C 0.124 BTU/lb-°F  annealed; 150-200°C (302-392°F)
Specific Heat Capacity at Elevated Temperature 0.586 J/g-°C 0.14 BTU/lb-°F  annealed; 350-400°C (662-752°F)
Thermal Conductivity 51.9 W/m-K 360 BTU-in/hr-ft²-°F