SAE 4140 Equivalent grades:
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 4140 Chemical composition:
The following table shows the chemical composition of SAE4140 steel:
SAE 4140 Mechanical Properties:
Bulk modulus (typical for steel)
Shear modulus (typical for steel)
Elongation at break (in 50 mm)
Hardness, Knoop (converted from Brinell hardness)
Hardness, Rockwell B (converted from Brinell hardness)
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)
Hardness, Vickers (converted from Brinell hardness)
Machinability (based on AISI 1212 as 100 machinability)
SAE 4140 Hardness:
SAE 4140 Heat treatment:
Heat treatment is carried out after hot working to render the steel suitable for machining and to meet the mechanical property ranges specified for the steel’s particular applications.
SAE 4140 Hardening:
SAE 4140 alloy steel bar, plate, and square can be hardened by cold working, or heating and quenching.
SAE 4140 alloy steel is usually supplied with ready heat treated to hardness in 18-22 HRC. If further heat treatment is required, then heat to 840 ℃ – 875 ℃, hold until temperature is uniform throughout the section, soak for 10 – 15 minutes per 25 mm section, and quench in oil, water, or polymer as required.
SAE 4140 Tempering:
Re-heat SAE4140 grade steel to 550℃ – 700 ℃ as required, hold until temperature is uniform throughout the section, soak for 1 hour per 25 mm of the section, and cool in still air.
SAE 4140 Physical Properties:
The physical properties of SAE 4140 alloy steel are highlighted in the following table.
SAE 4140 Thermal Properties:
SAE 4140 Annealing:
SAE 4140 alloy steel is annealed at 872°C (1600°F) followed by slowly cooling in the furnace.
SAE 4140 Density:
SAE 4140 Machinability:
SAE 4140 alloy steel has good machinability in the annealed condition.
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