EN45 / 251A58 Steel Properties
EN45 is a silico-manganese spring steel widely used for the manufacture of leaf springs and knives. EN45 is a silicon manganese spring steel (approx. 0.55% carbon), suitable for oil hardening and tempering.
Whilst it has been manufactured as both strip and bar in the past, the development of more sophisticated strip steels mean it is no longer generally available in strip form.
EN45 is suitable for the manufacture of springs and blades, widely used for making automotive leaf springs and much favoured in the manufacture of historical blades. Closely related or equivalent grades include 250A53, 250A57 and 55SiMn7.
BSS supply EN45 in flat and round bar, with a typical as-rolled hardness of 220/240vpn.
Related steel grades include BS970 250A53, 56Si7, 55Si7 and SAE 9260
Composition
Carbon – 0.55 – 0.6%
Manganese – 0.7 – 1.0%
Silicon – 1.5 – 2.0%
Phosphorous – 0.05% max
Sulphur – 0.05% max
BS970
250A53
56Si7
55Si7
SAE 9260
Applications
Typical applications for EN45 bar include:
– Automotive leaf springs
– Knives and swords
– General engineering usage
– Automotive heavy spring parts
If you have any questions about the suitability of this material, please call our friendly team on 0114 244 0527.
Our range of EN45
BSS can supply a range of sizes in EN45 flat bar. The bars are available in full lengths or can be cut to your exact requirements.
| Imperial Sizes available (ins) | Metric sizes available (mm) | ||
| 1.1/2 | 3/16 | 40 | 4 |
| 1.1/2 | 1/4 | 60 | 6 |
| 1.1/2 | 3/8 | 70 | 6 |
| 1.3/4 | 1/4 | 70 | 7 |
| 2 | 1/4 | 75 | 6 |
| 2 | 5/16 | 70 | 8 |
| 2.1/2 | 3/16 | 60 | 9 |
| 2.1/4 | 1/4 | 60 | 10 |
| 3 | 5/16 | 80 | 10 |
| 4 | 1/2 | 90 | 12.7 |
| 5 | 3/4 | 80 | 15 |
We do not supply Mill Certificates with orders, we only supply Certificates of Conformity.
