

S550GD+Z, S550GD+ZF is a kind of hot dipped  galvanized steel under the standard Q/BQB 420-2003 and it is a kind of low  alloy steel. The products are widely used in the automotive, appliance,  construction, machinery manufacturing and other industries.
S550GD+Z, S550GD+ZF Chemical composition:
| Grade | Chemical composition % | |||||
| C | Si | Mn | P | S | Alt | |
| S550GD+Z, S550GD+ZF | 0.25 | --- | 1.5 | 0.035 | 0.035 | - | 
 
S550GD+Z, S550GD+ZF Mechanical  Property:
| STEEL GRADE | Tensile    Strength | Yield    Strength | Elongation%    min | The    coating adhesion | |
| min | min | <0.7mm | >0.7mm | a=thickness | |
| S550GD+Z, S550GD+ZF | 560 | 550 | - | 3 | - | 
a means when nominal thickness > 1.5 mm, the diameter of curved heart is 40.
BEBON international is very professional  in the production for that material and we have our own factory. We can supply  it according to customer’s requirement. 
If you have need for S550GD+Z,  S550GD+ZF, please contact with us. Our email is [email protected] and our phone is  0086-371-86011527.