IS 5517 (1993) 31Ni10Cr3Mo6 Round Bars
31Ni10Cr3Mo6 is a 2.5% nickel-chromium-molybdenum high hardenability, high tensile steel, generally supplied hardened and tempered in the tensile range 930 - 1080 Mpa (Condition U) Rc 28 - 36. Characterised by high strength and toughness in very large sections - similar to 40Ni10Cr3Mo6 but with lower carbon content.
Pre hardened and tempered 31Ni10Cr3Mo6 can be further surface hardened by flame or induction hardening, and by nitriding.
31Ni10Cr3Mo6 Round Bar is used extensively in most industry sectors for applications requiring higher tensile and yield strength than 4140 can provide.
Chemical Composition of 31Ni10Cr3Mo6 Round Bar :
| Element | Min. % | Max % |
| Carbon | 0.27 | 0.35 |
| Silicon | 0.10 | 0.35 |
| Manganese | 0.40 | 0.70 |
| Nickel | 2.25 | 2.75 |
| Chromium | 0.50 | 0.80 |
| Molybdenum | 0.40 | 0.70 |
| Phosphorous | 0 | 0.035 |
| Sulphur | 0 | 0.035 |
Applications of 31Ni10Cr3Mo6 :
Adapters, Axles, Connecting Rods, Die Holders, Drill Shanks, Ejector Rods, Hydraulic Clamps, Jack Shafts, Line Shafts, Motor Shafts, Nuts, Pins, Piston Rods, Pump Shafts, Rams, Spindles, Torsion Bars Winch Gears etc.