8620 VS 4140 – 8620 steel and 4140 steel are both widely used steel in the industry. Let’s compare the differences between 8620 steel and 4140 steel.

What is AISI 8620 & AISI 4140 steel :

8620: AISI 8000 Series Steel; Ferrous Metal; Low Alloy Steel; Low Carbon Steel; Typical uses are: Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Splined Shafts, Ratchets, Sleeves, etc.

4140: AISI 4140 alloy steel is chromium, molybdenum, manganese containing low alloy steel. It has high fatigue strength, abrasion and impact resistance, toughness, and torsional strength.

8620 VS 4140 – Chemical of 4140 & 8620:
Item C(%) Si(%) Mn(%) P(%) S(%) Cr(%) Mo(%) Ni(%)
8620 0.18-0.23 0.15-0.35 0.70-0.90 ≤0.035 ≤0.04 0.40-0.60 0.15-0.25 0.40-0.70
AISI 4140 0.38~0.43 0.15~0.35 0.75~1.00 0.035 0.04 0.80~1.10 0.15~0.25 /

 

8620 VS 4140 – MECHANICAL PROPERTIES

8620 MECHANICAL PROPERTIES:Typical Mechanical Properties – Water Quenched at 830oC and Tempered as Indicated

Tempering Temperature oC
Tensile Strength Mpa 205 425 650
Yield Strength Mpa 1050 930 700
Elongation on 5.65√So % 765 800 556
Izod Impact J 18 20 30
Hardness 80 110 140
HB 311 275 207
Rc 34 29 16

 

4140 MECHANICAL PROPERTIES – The following values are average and may be considered as representative of this grade:

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 machinabilities) 65 65

 

8620 VS 4140 – Application :

4140 :Applications for 4140 include drill collars, kelly bars, bolts, subs, couplings, reamer bodies, rotary table shafting, valves, zinc-die casting dies, hydraulic machinery shafts, precision lead screws and winch shafts, among others.

8620 VS 4140

8620 :this material is ideal for a wide variety of applications. Gears, pinions, oil pump piston rods and liners, spline shafts, piston pins, cams, jigs, plastic molds, oil tool slips, jaws, gauges,etc

8620-application

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