SAE 8620 Case Hardening Steel

 

8620 is a low nickel – chromium – molybdenum medium hardenability, case hardening (carburizing) steel, generally supplied in the as rolled condition with a maximum brinell hardness of 280 (Rc30).Characterised by good core strength and toughness in small to medium sections with case hardness up to Rc62 when carburized, hardened and tempered.8620 can also be used (uncarburised) as a high tensile steel, which when suitably hardened and tempered can be utilized for various applications requiring good tensile strength and reasonable toughness.Pre hardened and tempered (uncarburized) 8620 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content.8620 (carburized) is used extensively by all industry sectors for light to medium stressed components and shafts requiring high surface wear resistance with reasonable core strength and impact properties.Typical uses are: Arbors, Bearings, Bushings, Cam Shafts, Differential Pinions, Guide Pins, King Pins, Pistons Pins, Splined Shafts, Ratchets, Sleeves etc
Colour Code Stocked Sizes
Yellow (Bar End) Rounds 10 mm to 260 mm Diameter
Bar Finish
Peeled, Turned or Hot Rolled
Related Specifications
Australia AS 1444-1996-8620/8620H
Germany W.Nr 1.6523 DIN 21NiCrMo2
Great Britain BS970: PART 3: 1991 805 M20
BS970: 1955 – EN362
Japan JISG 4052 SNCM 220H
USA SAE 8620 AISI 8620
ASTM A29/A29M 1991 8620
UNS G86200
Chemical Composition
Min. % Max. %
Carbon 0.17 0.23
Silicon 0.10 0.40
Manganese 0.60 0.95
Nickel 0.35 0.75
Chromium 0.35 0.75
Molybdenum 0.15 0.25
Phosphorous 0 0.04
Sulphur 0 0.04
Typical Mechanical Properties For Core – Carburised and Oil Quenched at 840 oC
Section Size 11 mm 30 mm 63 mm
Tensile Strength Mpa Min 980 780 690
Max 1270 1080 930
Yield Strength Mpa Min 785 590 490
Elongation 5.65√S0 % Min 9 10 11
Charpy Impact J Min 41 41
Hardness HB Min 290 235 205
Max 375 320 275
Hardness RC Min 31 23 16
Max 41 35 29
Typical Mechanical Properties – As Rolled
Tensile Strength Mpa 820
Yield Strength Mpa 590
Elongation on 5.65√S0% 22
Hardness HB 240
Rc 24

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