SAE 1018

SAE 1018 Grade Introduction:

There are many different categories of steel, and carbon steels are one such category that contains 0.12 to 2% carbon in them. The steel gains hardness and strength with heat treatment when the carbon percentage content increases; however its ductility is reduced.

SAE 1018 Grade Application:

  • Shafts
  • Spindles
  • Pins
  • Rods
  • Sprocket assemblies.

SAE 1018 Equivalent Grades:

Standard AISI / SAE 1018
UNS
WERKSTOFF NR. 25CrMo4, GS-25CrMo4
BS 970 708A30, CDS110
UNI 25CrMo4 (KB), 30CrMo4
JIS SCM 420, SCM 430, SCCrM1
EN name
EN # 1.7218

SAE 1018 Chemical Composition:

Element C Mn P S Fe
Carbon (%) 0.15-0.20 0.60-0.90 0.04 Max 0.05 Max Balance

Mechanical Properties:

Property Metric Imperial
Tensile strength 440 MPa 63800 psi
Yield strength 370 MPa 53700 psi
Modulus of elasticity 205 GPa 29700 ksi
Shear modulus (typical for steel) 80 GPa 11600 ksi
Poisson’s ratio 0.29 0.29

Physical Properties:

Property Metric Imperial
Density 7.87 g/cm³ 0.284 lb/in³

Thermal Properties:

Property Metric Imperial
Thermal conductivity 51.9 W/mK 360 BTU in/hr.ft².°F

Forging Properties:

Forging of SAE 1018 carbon steel can take place in the range of 996-1260°C (1825-2300°F).

Stress Relieving:

500°C – 700°C is required to relieve stress in AISI 1018 mild/low carbon steel that is later cooled down in still air.