EN25 is a 2.5% nickel–chromium–molybdenum high hardenability and high tensile steel, generally supplied in the hardened and tempered condition with a tensile range of 930 – 1080 MPa (Condition U), Rc 28 – 36.
This grade is also commonly searched as 31Ni10Cr3Mo6 round bars and 826M31 round bars, which are equivalent designations under different international standards. It is characterised by high strength and toughness in very large sections—similar to EN26 but with lower carbon content. Pre-hardened and tempered EN25 can be further surface hardened by flame or induction hardening, as well as by nitriding.
EN25 is widely used across industries for applications requiring higher tensile and yield strength than 4140, including 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, and winch gears.
| Element | Min. % | Max % |
|---|---|---|
| Carbon | 0.27 | 0.35 |
| Silicon | 0.10 | 0.40 |
| Manganese | 0.45 | 0.70 |
| Nickel | 2.30 | 2.80 |
| Chromium | 0.50 | 0.80 |
| Molybdenum | 0.45 | 0.65 |
| Phosphorous | 0 | 0.04 |
| Sulphur | 0 | 0.04 |
With an extensive experience of more than 20 years, Nilesh Steel Company has been serving as suppliers and stock holders of off-grade steel. With the untiring efforts of our founder and CEO Mr. Nilesh V Sanghvi, we have evolved into a brand name that has been trusted even by suppliers for industrial products, we have created a niche for ourselves in the industry. We are now one among the first choices for all sorts of off-grade steel solutions for industrial products.
