817M40 Engineering Steel
817M40 also known as EN24/EN24T comes treated as 817M40T to 850/1000 N/mm2 we can offer 817M40T 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 EN24T 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 EN24T 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 EN24T
Click here for Steel hardness conversion charts and heat treatment hardness tables
Engineering Steel
- EN3B - 080A15 070M20 Mild steel
- EN1A - 220M07 230M07
- EN1A LD - 220M07 PB 230M07 PB
- EN8 - 080A42 080M40
- EN9 - 070M55
- EN14 - 150M19
- EN16 - 605M36 606M36
- EN19 - 708M40 709M40
- EN24/EN24T - 817M40
- EN36 - 655M13
- S690QL
- Alloy24™
- 4130 - 708A25
- 4140 - 708M40
- 4140 Plate
- Chrome Plated Steel Bar
Useful tools
