Description
17CrNiMo6 Round Bars Case Hardening Steel
DIN 1.6587 / X4317 / 18CrNiMo7-6 / 18NCD6
17CrNiMo6 Round Bars is one of the most contemporary grades in the alloy bar market. It is characterised by high case hardness and depth combined with excellent core strength. Recently the grade has been developed further by slightly increasing Carbon and Manganese content and this led to the new designation 18CrNiMo7-6, which is the current official designation for this steel under Euronorm EN 10084, which supersedes DIN17210.
Normally supplied in the annealed condition with hardness max 229 HB, with typical hardness being in the range 170-200 HB.
It is also known as Case Hardening Alloy Steel DIN 1.6587.
17CrNiMo6 is a 1.8% chromium – nickel – molybdenum high hardenability, case hardening (carburizing) steel, generally supplied in the annealed condition with a maximum brinell hardness of 229 (Rc22).
Characterised by high core strength and toughness in medium to large sections with case hardness up to Rc62 when carburized, hardened and tempered.
17CrNiMo6 Round 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 toughness.
Pre hardened and tempered (uncarburized) 4317 can be further surface hardened by nitriding but will not respond satisfactorily to flame or induction hardening due to its low carbon content.
17CrNiMo6 (carburized) is used extensively by all industry sectors for components and shafts requiring high surface wear resistance, high core strength and impact properties.
Chemical Composition of 17CrNiMo7-6 :
| Elements | Min. % | Max. % |
| Carbon | 0.15 | 0.21 |
| Silicon | – | 0.40 |
| Manganese | 0.50 | 0.90 |
| Nickel | 1.40 | 1.70 |
| Chromium | 1.50 | 1.80 |
| Molybdenum | 0.25 | 0.35 |
| Phosphorous | – | 0.035 |
| Sulphur | – | 0.035 |
Related Specifications :
| Australia | AS1444 – 1996 4317/4317H |
| Germany | W.Nr 1.6587 |
| DIN 17210 17CrNiMo6 18CrNiMo 7-6 | |
| Great Britain | BS970: PART 3: 1991 820M17/822M17 |
| BS970: 1955 – EN354/EN355 | |
| USA | SAE 4317 |
| AISI 4317 | |
| France | ANFOR 18NCD6 |
| AS X4317 |
Mechanical Property Requirements :
Annealed Condition – Brinell Hardness 229 Maximum
Applications of 17CrNiMo6 Round Bars :
Heavy Duty Bushings and Bearings, Cam Followers, Clutch Dogs, Compressor Bolts, Extractors, Fan Shafts, Heavy Duty Gears, Pump Shafts, Sprockets, Tappets, Wear Pins, Wire Guides etc. .
DIN 1.6587 | 17CrNiMo6 |18CrNiMo7-6 steel for the parts which require core tensile strength and high hardness. Susceptible to the large seized parts with high wearing resistance and loading such as: Heavy Duty Bushings and Bearings, Cam Followers, Clutch Dogs, Compressor Bolts, Extractors, Fan Shafts, Heavy Duty Gears, Pump Shafts, Sprockets, Tappets, Wear Pins, Wire Guides etc..
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