Classification

Galvanized steel series
    • http://www.cnchangsong.com/uploadfiles/103.224.250.119/webid122/source/201511/144834690643.jpg
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Profile

Many surface patterns are feasible, stucco, diamond, embossed, mainly used in wall, roof, and curtain.


Summarization

Aluminium-zinc alloy armor plate, is called Al-Zn coated plate for short Strips, after through three processes, including payoff reel, crop shear and welding, enter into the continuous annealing furnace. During the annealing process, strips are heated closer to the recrystallizing temperature, and then heated to 20~50℃ above the recrystallizing temperature in the reducing furnace. After keeping the same temperature for 170s, strips are naturally cooled to the normal temperature in the slow cooling process. Afterward, strips enter into the zinc pot through the elephant's trunk and begin in the hot-dip coating process. The optimum temperature range of the plating coat is 630℃~660℃. Coated with aluminium-zinc alloy, strips enter into the cooling tower by the steady roll and air knife. After fast cooled with wind or water, they are directly produced into Al-Zn armor plates. The general rate of cooling is 30℃/s or so, and strips are cooled to about 60℃.

Specification

1. Production Grade: SGCC, DX51D, Q195

2. Thickness:  0.18-1.5mm

3. Width: 914mm, 1000mm, 1200mm, 1250mm mainly

4. Coating Type: 55%Al、43.5%Zn and 1.5%Si

5. Coating Thickness (both side, g/sqm): 50-150

6. Surface Finish: Regular Spangle、Small Spangle

7. Surface Treatment: Oring or Anti-finger print

8. Inside diameters: 508mm

   Outside diameters: as per customers' requirements


Chemial requirements

Chemical Requiremetns for structure steel

Composition, %-Heat Analysis Element, maximum, unless otherwise Shown

Designation

C

Mn

P

S

Cu

Ni

Cr

Mo

V

Cb

TiA

NB

G230

0.20

1.35

0.04

0.04

0.25

0.20

0.15

0.06

0.008

0.008

0.025

G255

0.20

1.35

0.10

0.04

0.25

0.20

0.15

0.06

0.008

0.008

0.025

G275

0.25

1.35

0.10

0.04

0.25

0.20

0.15

0.06

0.008

0.008

0.025

G340

0.25

1.35

0.20

0.04

0.25

0.20

0.15

0.06

0.008

0.008

0.025

G550

0.20

1.35

0.04

0.04

0.25

0.20

0.15

0.06

0.008

0.015

0.025


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