Stanmor 550 Very High Hardness Armour (VHH) Ballistic Steel Plate Manufacturer & Supplier
Stanmor 550 is very high hardness armour (vhh) — nominally 550 Brinell (530-590 HB) — roller quenched and tempered for ballistic protection. Certified against NIJ Level III and IV, STANAG 4569 Level I and II, and EN 1522 FB6/FB7. Supplied shot blasted and primed, ready to cut and weld without further heat treatment.
UNS: 530-590 HB | Category: Armor & Ballistic Steel Plate
Size Range
Outer Diameter: Thickness 3-80 mm · Width 1250-3000 mm · Length 4000-12000 mm
Wall Thickness: 3 - 80 mm
Chemical Composition (%)
| C | Mn | S | Si | Cr | Ni | Mo | CE |
|---|---|---|---|---|---|---|---|
| 0.32 max | 1.20 max | 0.010 max | 0.70 max | 1.80 max | 1.80 max | 0.70 max | 0.70 (C + Mn/6 + (Cr+Mo+V)/5 + (Cu+Ni)/15) |
Mechanical Properties
- Nominal Thickness
- 6.0 - 25.0 mm
- Hardness
- 480-540 HBW
- Yield Strength
- ≥ 1250 MPa
- Tensile Strength
- ≥ 1450 MPa
- Elongation (GL 50 mm)
- ≥ 8%
- Charpy V-notch @ -40 °C
- ≥ 25 J (average; single value min 70% of specified average)
Physical Properties
- Density
- 7.85 g/cm3
- Modulus of Elasticity
- 210 GPa
- Thermal Conductivity
- 40 W/m-K (20 C)
- Specific Heat
- 460 J/kg-K
- Coeff. of Thermal Expansion
- 12 um/m-C (20-200 C)
- Magnetic
- Ferromagnetic
Applicable Standards
- EN 10029:2010
- EN 10029 Class N:2010 (flatness)
- EN 10163-2 Class B Sub Class 3 (surface)
- EN 10160 S1E1 (ultrasonic, every plate)
- DIN EN ISO 6506-1 (hardness)
- NIJ 0108 Level III & IV
- STANAG 4569 Level I & II
- EN 1522 FB6 & FB7
Applications
- Armoured personnel carriers & military vehicles
- Cash-in-transit & security vans
- Bank counters, vaults & strong rooms
- Bullet resistant doors, window frames & walls
- Money exchange offices
- Secured containers
- Shooting gallery devices
- Police & para-military equipment
Industries Served
- Defence & Armoured Vehicles
- Homeland Security
- Banking & Cash Logistics
- Specialty Automotive
- High-Security Construction
Key Advantages
- Firing-test records against NIJ 0108.01, STANAG 4569 and EN 1522
- Delivered shot blasted and primed — ready to cut and weld
- No post-weld heat treatment needed to retain ballistic performance
- Available from 3 mm for add-on kits and interior protection
- Consistent hardness band keeps multi-batch builds interchangeable
Equivalent Grades
- SSAB
- Armox 550T
- Miilux
- Ramor 550
- Industeel
- Mars 300