EN45 Spring Steel (BS 250A53 / SAE 9260)
Comparable Standards
| Designation | Standard Grade |
| BS 970:1962 250A53 | EN45 |
| SAE AISI | 9260 |
| BS 970:1962 56Si7 | Closely Related |
| BS 970:1962 55Si7 | Closely Related |
Chemical Composition (wt %)
| C | Si | Mn | P (max) | S (max) |
| 0.50–0.60 | 1.50–2.00 | 0.70–1.10 | 0.05 | 0.05 |
Mechanical Properties
| Property | Value |
| As-Rolled Hardness | 220–240 VPN (~200 HB) |
| Hardened & Tempered Hardness | 45–52 HRC |
| Yield Strength (Tempered) | 1,200–1,600 MPa |
| Elongation at Break (Tempered) | 8–12 % |
| Modulus of Elasticity | 210 GPa |
| Fatigue Limit | ~600 MPa (50% of UTS) |
Heat Treatment Guidelines
– Annealing: Heat to 680–700 °C, hold 1 h per 25 mm, furnace cool to 600 °C at ≤20 °C/h, then air cool.
– Hardening: Heat to 900–930 °C, hold 15–30 min, quench in oil at 60–80 °C.
– Tempering: Temper at 480–620 °C (soak 1 h per 25 mm), air cool. Adjust for desired hardness/ductility.
Typical Applications
– Leaf springs & coil springs (automotive, machinery)
– Knife blades & spring blades
– Saw blades & cutting tools
– Precision instrument springs (clamps, valves)
– Torsion bars & shim stock
Supply Formats & Services
– Flat bars: 6–22 mm thickness × 44–130 mm width
– Round bars: 5–100 mm Ø
– Spring wire: 0.5–20 mm Ø
– Precision cutting to drawing (bandsaw, shearing)
– Heat treatment (hardening, tempering)
– Surface grinding & shot peening
– Ultrasonic (UT) & magnetic particle (MPI) testing
– Hardness & residual stress analysis
Certifications & Quality Assurance
– EN 10204 3.1 Mill-Traceable Test Certificates
– Hardness & microstructure reports on request
– ISO 9001:2015-compliant quality system (certification in process)
Logistics & Enquiry
Same-day Dispatch for standard lengths from Kolkata
24–48 hr turnaround on cut-to-size orders
PAN-India insured delivery via leading couriers
Enquire Now: sales@ascforgings.com | +91-XX-XXXXXXX