AISI 1065 Carbon Steel (UNS G10650)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Steels containing carbon as the major alloying element are called carbon steels. They may also contain up to 1.2% manganese and 0.4% silicon. Residual elements such as copper, molybdenum, aluminium, chromium and nickel are also present in these steels.

AISI 1065 carbon steel is a high-carbon steel, which has high tensile strength and heat treatable.

The following sections will give an overview of AISI 1065 carbon steel in detail.

Chemical Composition

The chemical composition of AISI 1065 carbon steel is outlined in the following table.

Element Content (%)
Iron, Fe 98.31 - 98.8
Manganese, Mn 0.60 - 0.90
Carbon, C 0.60 - 0.70
Sulfur, S 0.05
Phosphorous, P 0.04

Physical Properties

The physical properties of AISI 1065 carbon steel are tabulated below.

Properties Metric Imperial
Density 7.85 g/cm3 0.284 lb/in³

Mechanical Properties

The following table shows mechanical properties of cold drawn AISI 1065 carbon steel.

Properties Metric Imperial
Tensile strength, ultimate 635 MPa 92100 psi
Tensile strength, yield 490 MPa 71100 psi
Modulus of elasticity 200
Bulk modulus (typical for steel) 140 GPa 20300 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poissons ratio (typical for steel) 0.27-0.30 0.27-0.30
Elongation at break (in 50 mm) 10% 10%
Reduction of area 45% 45%
Hardness, Brinell 187 187
Hardness, Knoop (converted from Brinell hardness) 209 209
Hardness, Rockwell B (converted from Brinell hardness) 90 90
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 10 10
Hardness, Vickers (converted from Brinell hardness) 196 196
Machinability (based on AISI 1212 steel. as 100 machinability) 60 60

Thermal Properties

The thermal properties of AISI 1065 carbon steel are given in the following table.

Properties Metric Imperial
Thermal conductivity 49.8 W/mK 346 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to AISI 1065 carbon steel include the following:

  • ASTM A29 (1065)
  • ASTM A510 (1065)
  • ASTM A682 (1065)
  • ASTM A713 (1065)
  • MIL S-46049 (1065)
  • MIL S-46409 (1065)
  • QQ S700 (C1065)
  • SAE J1397 (1065)
  • SAE J403 (1065)
  • SAE J412 (1065)
  • SAE J414
  • DIN 1.1230

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