Zinc-iron alloy plate is also called alloyed galvanized plate. The alloying process heats the galvanized strip through the alloying furnace to 550~560 ° C in 5~10 seconds in order to convert the pure zinc layer into an iron-zinc alloy. Its weldability, coating performance, heat resistance, corrosion resistance are better than ordinary galvanized sheet.

Performance and characteristics

1. Suitable for alkaline low iron zinc iron alloy process, coating iron content 0.3 ~ 0.8%;

2. Fine crystal coating, brightness is white;

3. The alloy coating is easy to passivation, and the corrosion resistance of the alloy coating after passivation is more than three times that of the zinc layer passivation;

4. Stable plating solution, easy to maintain, can be hung plating or roll plating (including automatic line);

5. The cost is relatively low, and the original equipment can be used to turn the original zincate galvanizing liquid into a trough.

Use

By alloying, it can be made into superalloy or super alloy, corrosion resistant alloy, high resistance alloy, electric vacuum alloy and other materials with special properties. Widely used in aerospace, aviation, shipbuilding, electronics, electrical, machinery, chemical, electroplating and other industrial sectors.

In the early days, there were more zinc-iron alloys in automobiles, such as gasoline pumps, carburetors, and so on.

Because the surface galvanized liquid contains iron, so the welding performance is better than ordinary galvanized, also has rust resistance and corrosion resistance, the application is very wide.

Due to the different use of each product, its processing technology and raw material quality requirements are also different. Generally speaking, stainless steel products are different, its requirements for raw material thickness tolerances are also different, such as class II tableware and thermos cups, etc., thickness tolerances are generally higher, of -3~5%, and a class of tableware thickness tolerances generally require -5%, steel pipe requirements -10%, hotel freezer thickness tolerances are -8%. Dealers' requirements for thickness tolerances are generally between -4% and 6%. At the same time, the different sales of products at home and abroad will also lead to the different requirements of customers on the thickness tolerance of raw materials. Generally, customers of export products have higher thickness tolerance requirements, while domestic enterprises have relatively low thickness tolerance requirements (mostly due to cost considerations), and some customers even require -15%.

DDQ (deep drawing quality) material: refers to the material used for deep drawing (drawing), that is, the soft material that we say, the main characteristics of this material are high elongation (≧53%), low hardness (≦170%), the internal grain grade is between 7.0 and 8.0, and the deep drawing performance is excellent. Many enterprises that produce thermos bottles and POTS, the processing ratio of their products (BLANKING SIZE/ product diameter) is generally relatively high, and their processing ratios reach 3.0, 1.96, 2.13, and 1.98, respectively. SUS304DDQ materials are mainly used for these products that require a higher processing ratio, of course, products with a processing ratio of more than 2.0 generally need to be completed after several stretches. If the extension of raw materials can not be reached, the phenomenon of cracking and pulling through is easy to occur in the processing of deep-drawn products, which affects the qualified rate of finished products, and of course increases the cost of manufacturers;

② General materials: Mainly used for materials other than DDQ purposes, this material is characterized by relatively low elongation (≧45%), relatively high hardness (≦180HB), internal grain size grade between 8.0 and 9.0, compared with DDQ materials, its deep drawing performance is relatively poor, it is mainly used for products that can be obtained without stretching. Like a type of tableware spoon, spoon, fork, electrical appliances, steel pipe use. However, it has an advantage compared with DDQ materials, that is, the BQ property is relatively good, mainly due to its slightly higher hardness.

Stainless steel sheet is a low price material, but customers have very high requirements for its surface quality. Stainless sheet in the production process will inevitably appear a variety of defects, such as scratches, pitting, sand holes, dark lines, creases, pollution, etc., so that its surface quality, such as scratches, creases and other defects are not allowed to appear in advanced materials, and pitting, sand holes this defect in the spoon, spoon, fork, production is also never allowed, because it is difficult to throw it away when polishing. It is necessary to determine the surface quality level according to the degree and frequency of various defects on the surface, so as to determine the product grade.

First, will galvanized steel rust

1. Galvanized steel sheet will rust, according to the different environment of galvanized steel sheet, the reaction is not the same, if the galvanized steel sheet is placed outdoors for a long time, galvanized steel sheet will rust, if the galvanized sheet is placed indoors, and keep dry, do not let the galvanized steel sheet with water stains and corrosion liquid, then the galvanized sheet rust time will also be extended.

2. Galvanized steel plate corrosion and rust is a normal phenomenon, because the galvanized steel plate contains other impurities, such as iron and zinc and other metals, this is easy to produce corrosion effect, resulting in galvanized sheet rust.

3. Although the galvanized steel plate has a certain corrosion resistance and rust resistance, the ability of the galvanized steel plate is limited, if it is placed in a harsh environment for a long time, all the steel plates will rust.

4. Galvanized steel plate is also divided into cold galvanized steel plate and hot plated galvanized steel plate, usually cold galvanized steel plate is easier to rust, and hot galvanized steel plate is not easy to rust.

Second, why will galvanized steel rust

1. The uneven thickness of the galvanized steel sheet is likely to rust, and then drive the thick place, so that the entire galvanized steel sheet will rust.

2. Under normal circumstances, the galvanized steel plate at home is not suitable for being placed in a humid environment, and if the galvanized steel plate is placed in a humid environment for a long time, the galvanized steel plate will rust quickly.

Molded plate is a kind of steel plate with high strength and durability, which is mostly used for architectural decoration. Due to the use of high-strength steel plate, coupled with a reasonable size design, so that it is widely used in a variety of building roof, wall, easy installation, flexible, never limited by any factors in the building.

Main uses of color molded steel plate:

Used for all kinds of roof, wall decoration, all kinds of internal and external assembly materials, suitable for any building requirements.

Color molded steel plate material:

Color coated steel plate, hot dip galvanized steel plate, aluminum alloy steel plate, can be freely selected according to needs.

Color molded steel plate quality characteristics:

1.excellent waterproof performance

After the site assembly of the intersection treatment, in the case of roof slope > 4%, it can withstand any adverse weather conditions.

2. widely used

It can be combined with various insulation materials and various bottom layers to form thermal insulation or non-thermal insulation roofing. The length can be fixed according to the need to avoid longitudinal lap, thus eliminating the possibility of water leakage. Symmetrical appearance, no fastening screws exposed, neat and beautiful, excellent anti-corrosion performance. The hook type mechanical fixation is firm and reliable, and can withstand the change of thermal expansion. Beautiful appearance, easy installation, smooth drainage, economic building materials!

1. the reliability of galvanized steel plate is good, galvanized layer and steel is metallurgical combination, become a part of the surface, so the durability of the coating is more reliable.

2. galvanized steel plate has corrosion resistance. Galvanized steel plate is to prevent corrosion on the surface of the steel plate to extend its service life, coated with a layer of metal zinc on the surface of the steel plate, this zinc coated steel plate is called galvanized steel plate. Galvanizing is an economical and effective rust prevention method that is often used, and about half of the world's zinc production is used in this process. Galvanized steel plate is an important steel anti-corrosion plate, not only because zinc can form a dense protective layer on the surface of the steel, but also because zinc has a cathodic protection effect, when the galvanized layer is damaged, it can still prevent the corrosion of the iron base material through cathodic protection.

3. galvanized steel coating toughness, galvanized layer forms a special metallurgical structure, this structure can withstand mechanical damage during transport and use.

① Hot dip galvanized steel plate. The sheet steel is dipped into the melted zinc tank so that the surface is adhered to a zinc sheet steel.

② alloyed galvanized steel plate. This steel plate is also made with hot dip method, but after the trough, immediately heat it to about 500℃, fingerprint resistance galvanized sheet wholesale, so that the generation of zinc and iron alloy coating.

③ Electric galvanized steel plate. The galvanized steel plate made by electroplating has good workability. But the coating is thinner, corrosion resistance is not as good as hot dip galvanized sheet:

④ Single-side plating and double-side difference galvanized steel plate. Single-sided galvanized steel plate, that is, galvanized products only on one side. It has better adaptability than double-sided galvanized sheet in welding, coating, rust prevention and processing.

⑤ Alloy, composite galvanized steel plate. It is made of zinc and other metals such as lead, zinc alloy or composite plating of steel plate.

Specification and thickness of galvanized sheet

The thickness of ordinary galvanized sheet is 0.4~2.0.

Generally, it is not produced by large steel mills of state-owned enterprises, but by small steel mills of private enterprises. Conventional specifications are 0.35, 0.30, 0.28, 0.25, the thinest is generally 0.1, more than 2.0mm, because straightening is very difficult, the price above 2.0 will increase with the increase of thickness.

There are two kinds of galvanized sheet: hot galvanized sheet and electrogalvanized sheet. The national standards of these two kinds of galvanized sheets are briefly introduced.

According to GB/T 2518-2008, the thickness range of hot galvanized sheet is 0.3 ~ 5.0 mm

According to GB/T 15675-2008 "Continuous electric galvanized, zinc-nickel alloy coated steel plate and steel strip", its plate thickness is not specified. But according to GB/T 708-2006 "cold rolled steel plate and strip size, shape, weight and allowable deviation", galvanized sheet thickness is 0.40 ~ 4.00 mm

What kind of materials are used in different kinds of galvanized steel?

1. hot dip galvanized steel plate. The sheet steel is dipped into the melted zinc tank so that the surface is adhered to a zinc sheet steel. At present, continuous galvanizing process is mainly used to produce, that is, continuous immersion of rolled steel plate in the melting of zinc in the plating tank to make galvanized steel plate;

2. alloyed galvanized steel plate. This steel plate is also made by hot dipping, but immediately after it is out of the groove, it is heated to about 500℃ to create an alloy coating of zinc and iron. This galvanized sheet has good coating tightness and weldability;

3. electric galvanized steel plate. The galvanized steel plate made by electroplating has good workability. But the coating is thin, corrosion resistance is not as good as hot dip galvanized sheet;

4. single-side plating and double-side difference galvanized steel plate. Single-sided galvanized steel plate, that is, galvanized products only on one side. It has better adaptability than double-sided galvanized sheet in welding, coating, rust prevention and processing. In order to overcome the shortcomings of single side without zinc coating, there is a galvanized sheet coated with a thin layer of zinc on the other side, namely double-sided differential galvanized sheet;

5. alloy, composite galvanized steel plate. It is made of zinc and other metals such as lead, zinc alloy or composite plating of steel plate. This kind of steel plate not only has excellent anti-rust performance, but also has good coating performance.

The reason why sheet metal chassis processing uses galvanized tin plating

Now sheet metal chassis, generally with galvanized steel plate manufacturing. The reason why the steel plate is galvanized is mainly for corrosion protection. But because zinc is not easy to oxidize metal, so galvanized steel can be isolated from the air, to achieve the purpose of corrosion prevention, this understanding is wrong; In fact, the opposite is true. Zinc is a very reactive metal that is easily oxidized. But instead of being a loose powder like iron oxide, zinc oxide is a dense surface, and this layer of zinc oxide prevents further oxidation of the zinc inside.

For sheet metal case processing When the surface of galvanized steel plate is damaged and exposed to the internal iron surface, according to the principle of chemical batteries, zinc will oxidize before iron to protect the iron layer from damage because zinc is more active than iron. The combination of the two is the truth of galvanized steel plate protection. A good galvanized steel sheet should be grey and white matte, which is the color of the zinc oxide surface.

Some chassis of poor material use poor quality galvanized steel, even tinned steel plate. The product generally has a thin, uneven coating. Especially tinned steel, if the tin layer is not damaged, everything will be fine. However, once the tin layer is damaged, the iron will become the protection of the tin, rather than the pure steel plate paint, because tin is an inert metal.