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
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:
Element
C
Mn
P
S
Fe
Carbon(%)
0.15-0.20
0.60-0.90
0.04 Max
0.05 Max
Balance
SAE 1018 Mechanical Properties:
Properties
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
Elongation at break (in 50 mm)
15%
15%
Hardness, Brinell
126
126
Hardness, Knoop (converted from Brinell hardness)
145
145
Hardness, Rockwell B (converted from Brinell hardness)
71
71
Hardness, Vickers (converted from Brinell hardness)
131
131
Machinability (based on AISI 1212 steel. as 100 machinability)
70
70
SAE 1018 Hardness:
126
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:
Properties
Metric
Imperial
Density
7.87 g/cm3
0.284 lb/in3
SAE 1018 Thermal Properties:
Properties
Metric
Imperial
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:
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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