Description
EN26 Round Bars / 40Ni10Cr3Mo6 Round Bars
EN26 Round Bars is a 2.5% Nickel-Chromium-Molybdenum high hardenability, high tensile steel, generally supplied hardened and tempered in the tensile range 1000 – 1150 Mpa (Condition V) Rc 31 – 38.
Characterised by high strength and toughness in very large sections – similar to EN25 but with higher carbon content, particularly suitable where high surface pressure exists. Pre hardened and tempered EN26 can be further surface hardened by flame or induction hardening, and by nitriding.EN26 is used extensively in most industry sectors for applications requiring higher tensile and yield strength than 4140, 4340 or EN25 can provide.
We Textron Steel & Alloys are major Stockist & Supplier of EN26 Round Bars / IS5517:1993 40Ni10Cr3Mo6 in Various Range from 19 Dia to 350 Dia.
Applications of EN26 Round Bars :
Typical uses are: Axles, Connecting Rods, Die Holders, Hydraulic Shafts, Spindles, Motor Shafts, Pins, Rams, Rolls, Sockets, Tool Holders, Torsion Bars etc.
Related Specifications :
- Australia AS 1444-1996-X9940
- Germany W.Nr 1.6745 / 40NiMoCr10-4
- Great Britain BS970: PART 3: 1991 826M40
- BS970: 1955 – EN26
EN26 Chemical Compositions :
| Grade – EN26 / 40Ni10Cr3Mo6 | Elements | |
| Min. | Max. | |
| C | 0.36 | 0.44 |
| 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 EN26 Round Bars :
Heat to 1150°C – 1200°C maximum, hold until temperature is uniform throughout the section, and commence forging immediately. 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 EN26 Round Bars :
EN26 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 EN26 Round Bars :
Welding of EN26 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 EN26 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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