carbon-and-alloy-steel-4140

4140 is a 1% chromium – molybdenum medium harden capacity broadly useful in high tensile steel – for the most part supplied are hardened and tempered in the malleable scope of 850 – 1000 Mpa (condition T).4140 is presently accessible with enhanced mach inability, which greatly increases feeds and/or speeds, while also extending tool life without adversely affecting mechanical properties.

4140 is utilized broadly as a part of most industry areas for an extensive variety of utilizations, for example, Adapters, Arbors, Axle Shafts, Bolts, Crankshafts, Connection Rods, Chuck Bodies, Collets, Conveyor Pins & Rolls, Ejector Pins, Forks, Gears, Guide Rods, Hydraulic Shafts & Parts, Lathe Spindles, Logging Parts, Milling Spindles, Motor Shafts, Nuts, Pinch Bars, Pins Various, Pinions, Pump Shafts, Rams, Sockets, Spindles, Sprockets, Studs, Tool Holders, Torsion Bars, Worms etc.

Chemical Composition

Element Min Max
Carbon, C 0.35 0.45
Manganese, Mn 0.50 0.80
Silicon, Si 0.10 0.35
Molybdenum, Mo
Chromium,Cr 0.20 0.40
Ni 0.90 1.50
Sulfur, S 0.05
Phosphorous, P 0.05

PHYSICAL PROPERTIES

Properties Metric Imperial
Density 7.85 g/cm³ 0.284 lb/in³
Melting Point 1416°C 2580°F

Mechanical PROPERTIES

Properties Metric Imperial
Tensile Strength 655 MPa 95000 psi
Yield Strength 415 MPa 60200 psi
Bulk Modulus (typical for steel) 140 GPa 20300 ksi
Shear Modulus (typical for steel) 80 GPa 11600 ksi
Elastic Modulus 190–210 GPa 27557–30458 ksi
Poisson’s Ratio 0.27–0.30 0.27–0.30
Elongation at Break (in 50 mm) 25.70% 25.70%
Hardness, Brinell 197 197
Hardness, Knoop (converted from Brinell hardness) 219 219
Hardness, Rockwell B (converted from Brinell hardness) 92 92
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only) 13 13
Hardness, Vickers (converted from Brinell hardness) 207 207
Machinability (based on AISI 1212 as 100 machinability) 65 65

Thermal PROPERTIES

Properties Metric Imperial
Thermal Expansion Co-efficient (@ 0-100°C / 32-212°F) 12.2 µm/m°C 6.78 µin/in°F
Thermal Conductivity 42.6 W/mK 296 BTU in/hr·ft²·°F

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