Surface structure, code, characteristics and usage：
Surface structure |
Code |
characteristics |
usage |
|
Normal zinc flower |
Z |
The zinc flower after the zinc layer of condensation. |
General usage |
|
Small zinc flower |
X |
The surface of formation by the cooling of the zinc layer.it is tiny zinc flower smaller than general zinc flower. |
For normal zinc can not meet the requirement of the surface appearance |
|
finishing zinc flower |
G |
The special finishing processing of surface structure. |
Used for high requirement for the surface quality, such as Caitu substrate |
|
finishing small zinc flower |
GX |
||
|
Zero zinc flower |
N |
Using specific production process, making the plating surface has no visible zinc flowers. |
- |
|
zinc-iron alloy |
R |
No zinc flower, grey, general gloss. |
Paint is suitable for the progress. |
Coating types and the product scopes:
Basal types |
coating types |
The surface of the structure |
The coating weight range for following |
|
|
Pure zinc coating |
zinc-iron alloy coating |
|||
|
Cold rolled basal plate |
same thickness |
Z, X, G, GX, N, R |
40/40-225/225 |
30/30-90/90 |
|
same thicknessb |
N, R |
30-150(each side) |
- |
|
|
Hot rolled basal plate |
same thickness |
Z, X, G, GX |
50/50-140/140 |
- |
a: 50g/m2 the weight for coating is about 7.1μm.
b: For different thick coating, the biggest proportion is 1:3.
The recommended standard coating weight:
coating types |
The zinc layer class |
recommended coating weight |
coating code |
|
same thickness |
Z, ZF |
40/40 |
40/40 |
|
50/50 |
50/50 |
||
|
60/60 |
60/60 |
||
|
70/70 |
70/70 |
||
|
80/80 |
80/80 |
||
|
90/90 |
90/90 |
||
|
100/100 |
100/100 |
||
|
125/125 |
125/125 |
||
|
140/140 |
140/140 |
||
|
175/175 |
175/175 |
||
|
225/225 |
225/225 |
||
|
different thickness |
Z |
30/40 |
30/40 |
|
40/60 |
40/60 |
||
|
40/100 |
40/100 |
The coating weight value:
coating types |
The zinc layer class |
coating code |
The zinc coating weight g/m2 min |
|
|
Average single at three points |
Single point value |
|||
|
same thickness |
Z, ZF |
A/Ba |
A/Ba |
(0.85XA)/(0.85XB) |
|
different thickness |
Z |
|||
a: A and B is nominal coating weight for steel plate and strip(g/m2).
For example, the coating weight for outside surface is 120g/m2 and the coating weight for inner surface is 120g/m2. It is showed 120/120.
Size range we can supply:
Item |
nominal dimension |
|
|
Thickness |
0.3-3.0mm |
|
|
Width |
steel strip |
700-1830mm |
|
Longitudinal cutting steel strip |
450-900mm |
|
|
Length |
steel plate |
1000-6000mm |
|
steel strip |
(coil)inner diameter 610/580 |
|
The tolerance:
The thickness allowable deviation for cold rolled basal plate hot-dip galvanized with minimum yield strength less than 280 mpa:
Normal thickness |
thickness deviation allowance for below width |
|||||
|
general precision PT. A |
High precision PT. B |
|||||
|
<1200 |
>1200-1500 |
>1500 |
<1200 |
>1200-1500 |
>1500 |
|
|
0.30-0.40 |
士0.05 |
士0.06 |
- |
士0.03 |
士0.04 |
- |
|
>0.40-0.60 |
士0.08 |
士0.07 |
士0.08 |
士0.04 |
士0.05 |
士0.06 |
|
>0.60-0.80 |
士0.07 |
士0.08 |
士0.09 |
士0.05 |
士0.06 |
士0.06 |
|
>0.80-1.00 |
士0.08 |
士0.09 |
士0.10 |
士0.06 |
士0.07 |
士0.07 |
|
>1.00-1.20 |
士0.09 |
士0.10 |
士0.11 |
士0.07 |
士0.08 |
士0.08 |
|
>1.20-1.60 |
士0.11 |
士0.12 |
士0.12 |
士0.08 |
士0.09 |
士0.09 |
|
>1.60-2.00 |
士0.13 |
士0.14 |
士0.14 |
士0.09 |
士0.10 |
士0.10 |
|
>2.00-2.50 |
士0.15 |
士0.16 |
士0.16 |
士0.11 |
士0.12 |
士0.12 |
|
>2.50-3.00 |
士0.17 |
士0.18 |
士0.18 |
士0.12 |
士0.13 |
士0.13 |
The tolerance:
The thickness allowable deviation for cold rolled basal plate hot-dip galvanized with minimum yield strength not less than 280 MPa:
Normal thickness |
thickness deviation allowance for below width |
|||||
|
general precision PT. A |
High precision PT. B |
|||||
|
<1200 |
>1200-1500 |
>1500 |
<1200 |
>1200-1500 |
>1500 |
|
|
0.30-0.40 |
士0.06 |
士0.07 |
- |
士0.04 |
士0.05 |
- |
|
>0.40-0.60 |
士0.07 |
士0.08 |
士0.09 |
士0.05 |
士0.06 |
士0.07 |
|
>0.60-0.80 |
士0.08 |
士0.09 |
士0.11 |
士0.06 |
士0.07 |
士0.07 |
|
>0.80-1.00 |
士0.09 |
士0.11 |
士0.12 |
士0.07 |
士0.08 |
士0.08 |
|
>1.00-1.20 |
士0.11 |
士0.12 |
士0.13 |
士0.08 |
士0.09 |
士0.09 |
|
>1.20-1.60 |
士0.13 |
士0.14 |
士0.14 |
士0.09 |
士0.11 |
士0.11 |
|
>1.60-2.00 |
士0.15 |
士0.17 |
士0.17 |
士0.11 |
士0.12 |
士0.12 |
|
>2.00-2.50 |
士0.18 |
士0.19 |
士0.19 |
士0.13 |
士0.14 |
士0.14 |
|
>2.50-3.00 |
士0.20 |
士0.21 |
士0.21 |
士0.14 |
士0.15 |
士0.15 |
The width allowable deviation for steel plate and steel sheet:
Basal plate type |
Item |
nominal dimension |
|
|
Cold rolled basal plate |
Thickness |
0.3-3.0mm |
|
|
Width |
steel strip |
700-1830mm |
|
|
Longitudinal cutting steel strip |
450-900mm |
||
|
Length |
steel plate |
1000-6000mm |
|
|
steel strip |
(coil)inner diameter 610/580 |
||
|
Hot rolled basal plate |
Thickness |
>1.8-2.8 |
|
|
Width |
steel strip |
900-1500mm |
|
|
Longitudinal cutting steel strip |
450-900mm |
||
|
Length |
steel plate |
1000-6000mm |
|
|
steel strip |
(coil)inner diameter 610 |
||
Note: High precision applies only to the products with the state of scrap edge.
Nominal thickness of steel plate and steel belt refers to the sum of base plate thickness and coating thickness.