Properties

Properties


Mechanical properties

Metallic coated high-strength steel grades have the following mechanical properties (skin-passed) - these are measured transverse to the rolling direction:

 

Phosphorus-alloyed steels

  Grade CR P220
Coating type   GI/GA
Yield strength ReL N/mm2 220 - 280
Tensile strength Rm N/mm2 340 - 400
Elongation % 32
Min. r-value   1.3
Min. n-value   0.15
Not in EN 10346:2015. Tata Steel’s own specification.
Lower yield strength or 0.2% proof stress applies.
For galvannealed grades (ZF) the minimum elongation before fracture is lowered by 2%. 
Elongation after fracture A uses test piece length L0 = 80 mm.
For galvannealed grades (ZF) the minimum r90-value is lowered by 0.2.
Phosphorus-alloyed steels are currently not available with MagiZinc® coatings.
 

Chemical composition

Tata Steel supplies the following cast analysis with maximum values unless otherwise shown:

Phosphorus-alloyed steels

  Grade CR P220-GI/GA/ZM
C Max. 0.08
Mn Max. 0.7
P Max. 0.1
S Max. 0.025
Si Max. 0.5
Altot Min. 0.015
Ti Max. -
Nb Max. -
Not in EN 10346:2015. Tata Steel’s own specification.
All values in weight%.