EN45 Spring Steel, Carbon Spring Steel

EN45 spring steel is a silicon-manganese spring steel with approximately 0.55% carbon, widely used for the manufacture of leaf springs, knives, and historical blades. It is suitable for oil hardening and tempering, providing excellent strength, wear resistance, and spring properties.

BSS supplies EN45 flat bar in full lengths or cut-to-size to meet customer requirements.

EN45 Chemical Composition

EN45

Carbon – 0.55 – 0.6%
Manganese – 0.7 – 1.0%
Silicon – 1.5 – 2.0%
Phosphorous – 0.05% max
Sulphur – 0.05% max

EN45 Equivalent Grades

BS970
250A53
56Si7
55Si7
SAE 9260

Key Features of EN45 Steel

Carbon content: 0.55–0.6%
Silicon-manganese alloy for enhanced spring properties
Oil hardening and tempering capable
Supplied in flat bars
Typical as-rolled hardness: 220–240 VPN
Can be formed and quenched/tempered to desired shapes

Typical Applications of EN45 Spring Steel

EN45 is ideal for a variety of engineering and industrial uses:

Automotive leaf springs
Knives and cutting tools
Swords and historical blades
Heavy automotive spring components
General engineering applications

Why Choose BSS for EN45 Spring Steel?

📦 UK stock for fast delivery
⚙️ Flat bars supplied full-length or cut-to-size
✅ ISO9001 certified supplier
🔍 Technical support for spring steel applications

EN45 Spring Steel - Condition Supplied

BSS supplies EN45 in:

Black rolled flat bars
Can be formed with or without heating, then quenched and tempered to final shape
As-rolled hardness: 220–240 VPN
Certificates of Conformity supplied with orders (Mill Certificates not provided)

N.B. We do not supply Mill Certificates with orders, we only supply Certificates of Conformity.

Download EN45 Data Sheet

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
1.1/4	3/8	50	5
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