Description
EN25 Round Bars / 31Ni10Cr3Mo6 Round Bars
EN25 Round Bars 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 EN26 but with lower carbon content. Pre hardened and tempered EN25 can be further surface hardened by flame or induction hardening, and by nitriding. EN25 is used extensively in most industry sectors for applications requiring higher tensile and yield strength than 4140 can provide.
We Textron Steel & Alloys are major Stockist & Supplier of EN25 Round Bars / IS5517:1993 31Ni10Cr3Mo6 in Various Range from 19 Dia to 350 Dia.
Applications of EN 25 Round Bars :
Typical uses are: 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.
Related Specifications :
- Australia AS 1444 – 1996 – X9931
- Germany W.Nr 1.6743 / 32NiCrMo10-4
- Great Britain BS970: Part 3: 1991 826M31
- BS970: 1955 – EN25
EN25 Chemical Compositions :
| Grade – EN25 / 31Ni10Cr3Mo6 | Elements | |
| Min. | Max. | |
| C | 0.27 | 0.35 |
| Mn | 0.40 | 0.70 |
| Si | 0.10 | 0.35 |
| Ni | 2.25 | 2.75 |
| Cr | 0.50 | 0.80 |
| Mo | 0.40 | 0.70 |
| S | – | 0.035 |
| P | – | 0.035 |
Forging of EN25 Round Bars :
Heat to 1150°C – 1200°C maximum, hold until temperature is uniform throughout the section. Do not forge below 850°C. Following forging operation the work piece should be cooled as slowly as possible in sand or dry lime etc.
Machining of EN 25 Round Bars :
EN25 in the hardened and tempered as supplied condition is still regarded as being readily machinable and operations such as turning and drilling etc. can be carried out satisfactorily using machine manufacturers, recommendations for suitable tool type – feeds and speeds.
Welding of EN25 Round Bars :
Welding of EN25 in the hardened and tempered condition (as normally supplied), is not recommended and should be avoided if at all possible, as the mechanical properties will be altered within the weld heat affected zone. It is preferred that welding be carried out on EN25 while in the annealed condition, and that the work piece, immediately on cooling to hand warm, is then stress relieved at 640°C – 660°C prior to hardening and tempering.
If welding in the hardened and tempered condition is really necessary, then the work piece, immediately on cooling to hand warm, should be stress relieved at 15°C below the original tempering temperature.
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