Thank you. The site above shows a modulus of elasticity of about 29,000 psi,
which is usual for steels.
I thought the tensile strength might be quite a bit more than for more "ordinary
steels" (pardon the non-scientific terminology).
Aside: I got exactly one Google hit for "alloy 4027" and it wasn't the link
above. I did a lot of other searches but came up empty-handed.
[Yield strength varies with temper. Here is the annealed version]
Subcategory: AISI 4000 Series Steel; Low Alloy Steel; Low Carbon
Key Words: UNS G40270, ASTM A322, ASTM A331, ASTM A519, SAE J404, SAE
J412, SAE J770, alloy steels
Component Wt. %
C 0.25 - 0.3
Fe 98.08 - 98.7
Mn 0.7 - 0.9
Mo 0.2 - 0.3
P Max 0.035
S Max 0.04
Si 0.15 - 0.35
Annealed (heated to 865°C (1590°F), furnace cooled 11°C/hr to 425°C,
air cooled). Normalizing temp.: 905°C. Carburizing temp.: 900 - 925°C.
Physical Properties Metric English Comments
Density 7.85 g/cc 0.284 lb/in³
Hardness, Brinell 143 143
Hardness, Knoop 163 163 Converted from Brinell hardness.
Hardness, Rockwell B 78 78 Converted from Brinell hardness.
Hardness, Vickers 149 149 Converted from Brinell hardness.
Tensile Strength, Ultimate 515 MPa 74700 psi
Tensile Strength, Yield 325 MPa 47100 psi
Elongation at Break 30 % 30 % in 50 mm
Reduction of Area 52.9 % 52.9 %
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 Calculated
Machinability 70 % 70 % annealed and cold drawn. Based on 100%
machinability for AISI 1212 steel.
Shear Modulus 80 GPa 11600 ksi Typical for steel
Electrical Resistivity 2.45e-005 ohm-cm 2.45e-005 ohm-cm This value
is an average of known electrical resistivities of 4000 series steels
and is expected to be within 10% of the experimental value
Heat Capacity 0.475 J/g-°C 0.114 BTU/lb-°F Average heat capacity for
4000 series steels; expected to be within 10% of the experimental
Thermal Conductivity 44.5 W/m-K 309 BTU-in/hr-ft²-°F Typical for