The aluminum plating process is carried out on a continuous production line similar to that of hot dip galvanized thick steel plate, in which cold rolled thin steel plate is hot dipped into the molten metal liquid of aluminum (aluminum plating) or aluminum (aluminum plating) with a silicon mass percentage of 5% ~ 11% to obtain the desired metal coating.
Aluminized sheet steel
The aluminum plating process is carried out on a continuous production line similar to that of hot dip galvanized thick steel plate, in which cold rolled thin steel plate is hot dipped into the molten metal liquid of aluminum (aluminum plating) or aluminum (aluminum plating) with a silicon mass percentage of 5% ~ 11% to obtain the desired metal coating.
Aluminized sheet steel is used in cases where heat resistance, heat reflection, or corrosion resistance are required, and the sheet steel is both attractive and economical.
A thick (usually 30-50 micron) coating produced by immersion in non-alloyed molten aluminum.
Application:
This product is usually used for outdoor structural purposes, such as roofs, culverts and grain silos, requiring a low formability requirement but with excellent corrosion resistance.
Aluminum – silicon alloy coating is relatively thin, the appearance quality has been improved.The commonly used thickness is about 20 ~ 25 microns.If the formability requirements are particularly high, a thinner coating thickness of 12 microns can be used.
Application:
It can be used for more applications, mainly for applications requiring formability and high temperature resistance, such as automobile exhaust pipe parts.
Characteristics of aluminized sheet
Corrosion resistance
The value of aluminum as a protective layer of thin steel lies mainly in its inherent corrosion resistance. In most environments, the long-term corrosion rate of aluminum is only 15-25% that of zinc.
In general, the value of aluminum coatings to steel substrates depends on thickness.As long as the coating remains undamaged, it provides long-term protection.
Aluminum coatings in most environments are especially exposed to the atmosphere without providing sacrificial anode protection.
Heat resistance
Aluminized sheet steel has excellent oxidation resistance at high temperature.
The aluminum coating protects the steel from oxidation and does not stain itself when the surface flap does not exceed approximately 510°C.
The coating still protects the steel at 510~675°C, but darkens the surface as the aluminum-iron-silicon alloy develops.The alloy layer is extremely resistant to heat, but because it has a different coefficient of expansion from steel, the coating becomes brittle and flaking when it exceeds 675°C.
Weldability
Aluminized sheet steel can be connected by resistance welding (spot or seam welding), metal arc welding, spark butt welding or oxy welding.
Before connecting, it is recommended to use wire brush to thoroughly remove oil, grease, paint and dirt.Metal arc welding and block oxygen welding also require the use of specialized fluxes.
Aluminum may be attached to the electrode during resistance welding, so the electrode head or welding wheel needs to be polished more frequently.At the same time, the welding current density should also be greater than the welding of uncoated steel plate
Standard and grades for aluminized sheet
The JIS standard, for example, is included in the JISG3314, with typical grades such as SA1C and similar grades in other standards such as ASTM
Brand
SA1C Jis G3314 2010 aluminum or aluminum silicon
Brand interpretation
S steel,
A aluminum,
1 serial number, representing heat resistance
C commercial
The approximate number
DX51D OYN 4022 2015:aluminum or aluminum silicon alloy coated steel
DX51D EN 10346 2015:aluminum or aluminum silicon alloy coated steel
A463M CSTypeC ASTM A463/A463M 2010:aluminum or al-si alloy coating
The little knowledge of Aluminized
Aluminum plate has some other characteristics, may be different due to the production process or use conditions, there will be a special case, so as a small point remarks.
1, the surface of aluminum plate, not only beautiful processing, and has excellent reflection performance, at 500°C below the temperature, with about 80% light reflectance;The reflectivity in infrared is 95 percent.Therefore, the aluminized plate can be made into an efficient thermal barrier or heat reflector in high temperature applications, which can rapidly increase the temperature in the furnace through effective heat reflection.
2, aluminum plate between the substrate and the coating, because of the existence of iron and aluminum alloy, therefore, generally considered to be worse than cold rolled steel, galvanized steel plate processing.But for the various processing characteristics of aluminized steel plate, if it can be processed according to the method can obtain almost the same processing effect as other steel plates.
3, when coating on aluminum plate, in order to make the adhesion stable, the chemical coating needs to be pretreated.
4. The aluminized layer of aluminized steel plate is composed of aluminum, silicon and iron elements.Some authorities under the Japanese government have verified that the aluminum plate without chemical passivation complies with the food hygiene law, is harmless to human health, and can be directly applied to food processing.Test reports from many professional bodies prove that they are environmentally friendly and harmless to humans.