BS 970 (3) 1991 805M20 Case Hardening Steel
805M20 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. 805M20 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) 805M20 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content. 805M20 (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
Related Specifications :
Germany W.Nr 1.6523 DIN 21NiCrMo2
Great Britain BS970: PART 3: 1991 805M20
BS970: 1955 - EN362
Japan JISG 4052 SNCM 220H
USA UNS G86200
Chemical Composition of BS 970 (3) 1991 805M20 Case Hardening Round Bars :
| Elements | Min. | Max. |
| C | 0.17 | 0.23 |
| Si | 0.10 | 0.40 |
| Mn | 0.60 | 0.95 |
| Ni | 0.35 | 0.75 |
| P | - | 0.040 |
| S | - | 0.050 |
| Cr | 0.35 | 0.65 |
| Mo | 0.15 | 0.25 |
Applications of 805M20 :
This carburising steel grade is suitable for shafts, gears, pinions, colletts. 805M20 is commonly used in the engineering and automitive industries for toolholders and other such components.
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