817M40 Engineering Steel
817M40 also known as EN24 comes treated as 817M40T to 850/1000 N/mm2 we can offer 817M40 in plate from 10mm thick up to 300mm, diameters from 10mm up to 950mm, squares from 20mm to 300mm and flats 20 x 10 up to 3000 x 300mm from stock. 817M40 is a popular through-hardening steel with good machinability in the "T" condition. 817M40T is used in gears, shafts, studs and bolts. 817M40T can be further surface-hardened to create components with enhanced wear resistance by induction or nitriding processing.
We stock 817M40 and 817M40T for rapid local and national delivery, also available for export, call for details.
For popular 817M40 stock please see our EN24 stock page.
| BS 970 1991 | BS 970 1955 EN | AISI/SAE | Werkstoff |
| 817M40 | EN24 | 4340 | 1.6565 |
EN24T properties, composition and equivalents here.
817M40T is renown for its wear resistance properties and also were high strength properties are required.
Typical chemical composition of 817M40.
C |
SI |
MN |
S |
P |
Cr |
Mo |
Ni |
|---|---|---|---|---|---|---|---|
0.36/0.44 |
0.10/0.35 |
0.45/0.70 |
0.040 MAX |
0.035 MAX |
1.00/1.40 |
0.20/0.35 |
1.30/1.70 |
A range of popular 817M40 size ranges can be found on the EN24 stock page, other sizes available upon request.
As we cut all our 817M40 flats & squares from plate we can cut other sizes more suitable for you.
817M40 Steel is equivalent to AISI 4340 steel or Werkstoff 1.6565 and EN24