H220BD+Z, H220BD+ZF is a kind of hot dipped galvanized steel under the standard Q/BQB 420-2003 and it is a kind of bake hardening of high strength steel, same as H180BD+Z, H180BD+ZF steel. The figure 220 means the minimum yield strength is 220Mpa.
H220BD+Z, H220BD+ZF Chemical composition:
Grade |
Chemical composition % |
|||||||
|
C |
Si |
Mn |
P |
S |
Alt |
Tib |
Nb |
|
|
H220BD+Z, H220BD+ZF |
0.06 |
0.5 |
0.7 |
0.08 |
0.025 |
0.02 |
- |
- |
H220BD+Z, H220BD+ZF Mechanical Property:
Grade |
Tensile Strength |
Yield Strength |
n90 |
r90 |
BHb |
Elongation% min |
The coating adhesion |
|
|
min |
min |
Mpa |
(Lo=80mm b=20mm) |
<1.5 |
1.5-3.0 |
|||
|
H220BD+Z, H220BD+ZF |
340-400 |
220-280 |
0.15 |
1.2 |
30 |
32 |
1a |
1a |
a: For alloy hot dipped product, the elongation minimum value can reduce 2%, r90 can reduce 0.2.
b, BH value refers to puting the sample through 2% prestrain on the temperature 170C 土5C, keeping 20 minutes, then doing tensile test under the indoor temperature, the added value of measured yield strength compared with the stress at the time of the sample 2% prestrain.
c: When coating weight of the two sides is more than 180g/m2, the bending diameter adds to 1a; For difference thick coating products, thick coating surface as the outer surface of the bending test.
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