ALLOY & CARBON 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, C0.35 0.45
Manganese, Mn0.500.80
Silicon, Si0.100.35
Ni-.-- -.--
Molybdenum, Mo0.20 0.40
Chromium0.90 1.50
Sulfur, S-.--0.05
Phosphorous, P-.--0.05

Physical Properties


Properties
Metric
Imperial
Density7.85 g/cm30.284 lb/in³
0.284 lb/in³1416°C2580°F

Mechanical Properties


Properties
Metric
Imperial
Tensile strength655 MPa95000 psi
Yield strength415 MPa60200 psi
Bulk modulus (typical for steel)140 GPa20300 ksi
Shear modulus (typical for steel)80 GPa11600 ksi
Elastic modulus190-210 GPa27557-30458 ksi
Poisson's ratio0.27-0.300.27-0.30
Elongation at break (in 50 mm)25.70%25.70%
Hardness, Brinell197197
Hardness, Knoop (converted from Brinell hardness)219219
Hardness, Rockwell B (converted from Brinell hardness)9292
Hardness, Rockwell C (converted from Brinell hardness. Value below normal HRC range, for comparison purposes only)1313
Hardness, Vickers (converted from Brinell hardness)207207
Machinability (based on AISI 1212 as 100 machinability)6565

Thermal Properties


Properties
Metric
Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F)12.2 µm/m°C6.78 µin/in°F
Thermal expansion co-efficient (@ 0-100°C/32-212°F)42.6 W/mK296 BTU in/hr.ft².°F

Features


Heat Treatment

Tempering

Hardening

Normalizing

Soft Annealing

Forging

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