550 EN

Ballistic protection steel

MITAK 550 is a steel that can be used in most protection applications :

  • Armored vehicles (light, heavy, cross-country, limousines)
  • Protective doors and walls
  • Safe deposit boxes

It is an excellent grade, combining performance, lightness and ease of handling. Thinner than MITAK 500 for the same ballistic protection performance, this steel allows weight savings for the most demanding applications.

  • Hardness (HB)


    530-580

  • Thickness (HB)


    5-15

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the technical file


Mechanical properties

Thickness (mm) ReH (N/mm²) Rm (N/mm²) Minimum elongation A5 (en %) Tenacity KV (direction through) J – 40°c
≤15 ≥1200  ≥1600 ≥7 ≥14

Ladle Composition

C S P Si Mn Ni Cr Mo B
≤0,4 ≤0,01 ≤0,02 ≤0,4 ≤1,2 1,6 ≤0,8 ≤0,6 ≤0,005

Cold bending radius

Thickness (mm) Transversal to rolling (R/E) Longitudinal to the bearing Transverse width (W/E) Longitudinal width (W/E)
E≤8 7 7 20 20
8≤E≤20 8 8 20 20
  • R = Recommended radius (mm)
  • E = Thickness of the plate (mm)
  • L = Width
  • W = Opening width (mm)

* Average of 3 tests.
Single value min. 70% of the specified average.
Thickness & 12 mm, undersized Charpy V specimens were used.