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.