Hot dip galvanized square tube
Hot dip galvanizing is the process of reacting molten metal with an iron matrix to produce an alloy layer，So as to combine the substrate and the coating together。Hot dip galvanizing is the process of first pickling steel components，To remove iron oxide from the surface of steel components，After acid washing，Cleaning is carried out by using ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride in a tank，Then it is sent to the hot-dip plating tank。Hot dip galvanizing has a uniform coating，Strong adhesion，Advantages such as long service life。
product description
Hot dip galvanizing is the process of reacting molten metal with an iron matrix to produce an alloy layer，So as to combine the substrate and the coating together。Hot dip galvanizing is the process of first pickling steel components，To remove iron oxide from the surface of steel components，After acid washing，Cleaning is carried out by using ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride in a tank，Then it is sent to the hot-dip plating tank。Hot dip galvanizing has a uniform coating，Strong adhesion，Advantages such as long service life。
Hot dip galvanizing is one of the effective methods to delay environmental corrosion of steel materials，It is cleaning the surface、 Activated steel products immersed in molten zinc solution，Through the reaction and diffusion between iron and zinc，Coating zinc alloy coatings with good adhesion on the surface of steel products。 Compared to other metal protection methods，The hot-dip galvanizing process combines the physical barrier of the coating with electrochemical protection to enhance its protective properties，In terms of the bonding strength between the coating and the substrate、The density of the coating、durability、Maintenance free and economical, as well as their adaptability to product shape and size，Having advantages。At present, hot-dip galvanized products mainly include steel plates、steel strip、wire、Steel pipes, etc，Among them, hot-dip galvanized steel plates account for a large proportion。
The production process of hot-dip galvanizing is as follows：
Base material→Degreasing→wash→acid pickling→wash→rinse→Flux solution→bake→CGL→cooling→test→package
Application scope
for a long time，Hot dip galvanizing process due to its low plating cost，Highly favored by people for its excellent protective features and beautiful appearance，Widely used in automobiles、building、household electrical appliances、chemical industry、machinery、petroleum、metallurgy、light industry、traffic、power、Fields such as aviation and ocean engineering。
Product parameters
product name | Hot dip galvanized sheet |
thickness | 0.12mm-6.00mm |
width | 600mm-1500mm |
length | 1m-12m，Support customization |
standard | AISI,ASTM,DIN,JIS,GB,JIS,SUS,ENclass |
Zinc layer | CGL：60-275g/m² |
Pre galvanized：80-275g/m² |
chemical composition
standard | grade | C | Si | Mn | P | S | Ti |
used forcold-forming Chinese standards | DX51D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
DX52D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
DX53D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
DX54D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
DX56D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
DX57D+Z | 0.12 | 0.50 | 0.60 | 0.100 | 0.045 | 0.30 |
used forcold-forming Japanese standard | SGCC | 0.15 | 0.50 | 0.80 | 0.050 | 0.030 | 0.025 |
SGCD1
SGCD2 | 0.12
0.10 | 0.50
0.50 | 0.60
0.45 | 0.040
0.030 | 0.030
0.030 | 0.025
0.025 |
SGCD3 | 0.08 | 0.50 | 0.45 | 0.030 | 0.030 | 0.025 |
SGCD4 | 0.06 | 0.50 | 0.45 | 0.030 | 0.030 | 0.025 |
used forstructure Japanese standard | SGC340 | 0.25 | 0.50 | 1.70 | 0.200 | 0.035 | 0.025 |
SGC400
SGC440 | 0.25
0.25 | 0.50
0.50 | 1.70
2.00 | 0.200
0.200 | 0.035
0.035 | 0.150
0.150 |
SGC490 | 0.30 | 0.50 | 2.00 | 0.200 | 0.035 | 0.025 |
SGC510 | 0.30 | 0.50 | 2.50 | 0.200 | 0.035 | 0.025 |
used forstructure AISIstandard | S220GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
S250GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
S280GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
S320GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.025 |
S350GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.150 |
S550GD+Z | 0.20 | 0.60 | 0.70 | 0.100 | 0.045 | 0.150 |
Mechanical properties
grade | yield strength MPa≥ | tensile strength MPa≥ | elongation A%≥ |
DX51D+Z/ZM/AZ/AM | 240-380 | 270-500 | 22 |
DX52D+Z/ZM/AZ/AM | 140-300 | 270-420 | 26 |
DX53D+Z/ZM/AZ/AM | 140-260 | 270-380 | 30 |
DX54D+Z/ZM/AZ/AM | 120-220 | 260-350 | 36 |
S220GD+Z/ZM/AM | 220 | 300 | 20 |
S250GD+Z/ZM/AZ/AM | 250 | 330 | 19 |
S280GD+Z/ZM/AM | 280 | 360 | 18 |
S300GD+AZ/AM | 300 | 380 | 18 |
S320GD+Z/ZM/AM | 320 | 390 | 17 |
S350GD+Z/ZM/AZ/AM | 350 | 420 | 16 |
S450GD+AZ/AM | 450 | 480 | 15 |
S550GD+Z/ZM/AZ/AM | 550 | 550 | － |
Galvanized surface selection
Zero Zinc Flower | Minimized Spangle | Normal Zinc Flower | Big Zinc Flower |
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Usage environment | Recommended thickness of zinc layer |
indoor use | Z10perhapsZ12 (100g/㎡or 120g/㎡) |
suburbs | Z20 combinepaint (200g/㎡) |
Urban or industrial areas | Z27（270can/㎡) perhapsG90（American Standard）And paint it |
coastal areas | compareZ27thick（270can/㎡) perhapsG90（American Standard）And paint it |
Stamping or deep drawing applications | compareZ27thin（270can/㎡) perhapsG90（American Standard）Avoid coating peeling off after stamping |
Surface treatment type | code | characteristic |
Chromic acid treatment | C | Good corrosion resistance，Suitable for naked state |
Chromic acid treatment+oil | S | Good corrosion resistance |
Phosphoric acid treatment（Including hole sealing treatment） | P | Has a certain degree of corrosion resistance，Good paint performance |
Phosphoric acid treatment（Including hole sealing treatment）+oil | Q | Has a certain degree of corrosion resistance，Good paint performance，Prevent rust during transportation and storage |
Phosphoric acid treatment（Excluding sealing treatment） | T | Has a certain degree of corrosion resistance，Good paint performance |
Phosphoric acid treatment（Excluding sealing treatment）+oil | V | Has a certain degree of corrosion resistance，Good paint performance，And prevent rusting |
oil | O | transport、Prevent rust during storage |
Untreated | M | Suitable for immediate painting |
Material comparison
Chinese standards | Japanstandard | European Standards |
DX51D+Z/DC51D+Z (CR) | SGCC | DX51D+Z |
DX52D+Z/DC52D+Z | SGCD1 | DX52D+Z |
DX53D+Z/DC53D+Z/DX54D+Z/DC54D+Z | SGCD2/SGCD3 | DX53D+Z/DX54D+Z |
S220/250/280/320/350/550GD+Z | SGC340/400/440/490/570 | S220/250/280/320/350GD+Z |
DX51D+Z/DD51D+Z (HR) | SGHC | DX51D+Z |
