SAE 1018

Equivalent grades:

AISI / SAE 1018



25CrMo4, GS-25CrMo4

BS 970

708A30, CDS110


25CrMo4 (KB), 30CrMo4


SCM 420, SCM 430, SCCrM1

EN name

EN #


Addition to other grades:

MS, EN1A, EN3B, EN8, EN8D, EN9, EN24, EN31, EN32B, EN36C, EN41B, EN43B, EN47, EN353, IS2062, 42Crmo4, HCHCR, D2, D3, H-11, H-13, CW-1, OHNS M2, M35, M42, DIN-1.2714, P20, P20+S, P20+Ni, SCM420, ASTMSA-36, ASTM SA-105 , SAE1018, SAE1010, SAE4140, SAE8620, 16MNCR5, 20MNCR5, C20, C45, C50, C60, CK45, 20C8, 40C8, 45C8, 55C8, C55MN75, SAE52100, S40C, S355J2G3.


SAE 1018 Chemical composition:

The following table shows the chemical composition of SAE 1018 steel:









0.04 Max

0.05 Max


SAE 1018 Mechanical Properties:




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



Elongation at break (in 50 mm)



Hardness, Brinell



Hardness, Knoop (converted from Brinell hardness)



Hardness, Rockwell B (converted from Brinell hardness)



Hardness, Vickers (converted from Brinell hardness)



Machinability (based on AISI 1212 steel. as 100 machinability)



SAE 1018 Hardness:


SAE 1018 Heat treatment:

SAE 1018 carbon steel can be case hardened to Rc 42, but only in thin sections. In case of thicker sections of over 4 in., Rc 28-30 can be obtained.


SAE 1018 Physical Properties:





7.87 g/cm3

0.284 lb/in3


SAE 1018 Thermal Properties:





Thermal conductivity

51.9 W/mK

360 BTU in/hr.ft2.°F

SAE 1018 Forging Properties:

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


SAE 1018 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.

SAE 1018 Normalizing:

AISI 1018 mild/low carbon steel should be heated at 890°C – 940°C and then cooled in still air.

SAE 1018 Annealing:

Complete annealing of this alloy can be achieved by soaking at 899°C (1650°F) followed by furnace cooling. Process annealing can be done at 649°C (1200°F).

SAE 1018 Density:


7.87 g/cm3

0.284 lb/in3

SAE 1018 Machinability:

SAE 1018 carbon steel is rated at 62% of AISI 1112 carbon steel. Machining provides this alloy with a fine finish, with continuous and hard chips. It is possible to machine this alloy in all conditions.

SAE 1018 Welding:

SAE 1018 carbon steel can be welded using most of the conventional methods such as gas, oxyacetylene, resistance, and submerged melt welding.


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