Hot galvanized sheet is hot rolled galvanized sheet, cold galvanized sheet is cold rolled galvanized sheet. From the material point of view, the composition of the two galvanized sheets are basically similar, the difference is that the cold galvanized sheet is thinner than the hot galvanized sheet, the surface quality is better, the process is more complex, and the price is higher. From the process point of view, the steel is rolled by hot rolling, rolled into a certain thickness of the plate, such as the thickness of 10mm or so, if the user has no higher requirements for the surface of the plate, thickness, mechanical strength, it can be processed as a finished product, such as galvanized, sold directly, is a hot plate. If there are higher requirements for the plate, then the hot-rolled plate is sent to the cold rolling line for re-processing, after pickling, annealing, re-rolling and other processes, to get a thinner, smooth surface and better mechanical properties of the cold-rolled plate.

1. Different references

1. cold binding plate: hot rolled coil as raw material, at room temperature under the recrystallization temperature to stop rolling products.

2. galvanized plate: refers to the appearance of a layer of zinc plated steel plate.

Second. different characteristics

1. cold binding plate: because it does not stop heating, there is no pitting and oxide sheet defects that are often presented in hot rolling, and the appearance is good and the brightness is high. Moreover, the dimensional accuracy of cold-rolled products is high, and the performance and organization of products can meet some special application requirements, such as electromagnetic properties and deep drawing properties.

2. galvanized sheet: Galvanized sheet due to the different treatment methods in the plating process, the appearance of the state is different, such as ordinary zinc flowers, fine zinc flowers, flat zinc flowers, zinc flowers and phosphating treatment appearance. The German code also rules for appearance levels.

Three. different uses

1. cold tie plate: mostly used in automobile manufacturing, electrical products and so on.

2. Galvanized sheet: mainly used in construction, light industry, automobile, agriculture, animal husbandry, fishery and commercial industries. The construction industry is mainly used for the manufacture of anti-corrosion industrial and civil building roof panels, roof grilles, etc. The light industry uses it to manufacture home appliance housings, civil chimneys, kitchen utensils and so on.

"Galvanized sheet 275g/㎡" means that the sum of the double-sided galvanized amount of the galvanized sheet per square meter area is 275 grams. The zinc flowers of hot dip galvanized steel plate are larger and more obvious, called "zinc flowers", and the zinc flowers are not fine enough, called "no zinc flowers".

What does having flowers and no flowers mean which is more expensive?

The zinc flowers of hot dip galvanized steel plate are larger and more obvious, called "zinc flowers", and the zinc flowers are finer and less obvious, called "no zinc flowers".

The hot plate substrate is generally made of zinc flowers, the cold plate substrate is generally made of no zinc flowers, and the cold plate is made of no zinc flowers, the surface is more smooth and smooth, the hardness is low, the elongation is high, the directional consistency is good, and the price is more expensive.

Galvanized sheet flowers and flowers are differentiated according to the surface state of galvanized sheet, generally weak eye will know, the surface has a pattern is flowers, there is no flowers. Flowers and no flowers have nothing to do with the material. The material depends on the substrate used for galvanizing, such as Q195, Q345, SPCC and so on. There is also no relationship between thickness and presence of zinc flowers.

There is a galvanized sheet, that is, the surface of the galvanized sheet is printed with a pattern, the appearance looks very bright, beautiful, and is generally used to make home appliance shells, buckets, and so on. There is no pattern on the surface of the flowerless galvanized sheet, which looks not as bright as the flowered galvanized sheet, dark color, and cold plate. There is no difference in performance, mainly in appearance.

There is a flower is the surface of the board has a pattern like a leaf, but also divided into small zinc flowers with large zinc flowers, no flowers is like aluminum plate, flat what pattern is not there

In the process of welding, cracks, pores or softened structures are easy to appear inside the molten core. Especially in the spot welding process of galvanized steel plate, if the welding specification is not reasonable, it may lead to some problems. First, some zinc and zinc-iron alloys may remain in the joint. These residues may form fine cracks or pores in the process of crystallization. This is because the high temperature during the welding process will cause physical or chemical reactions between zinc and zinc-iron alloys, which changes the physical properties of the molten core, making it more prone to cracks or pores. Secondly, if the residual zinc is more, it may also form softened tissue. This is because zinc reacts with the steel matrix during the welding process to form a zinc-iron alloy, which is lower in hardness and strength than steel, so it can lead to the softening of the molten core.

Hot-dip galvanized channel steel, also known as hot-dip zinc channel steel and hot-dip galvanized channel steel, is an effective way to prevent metal corrosion. It is to immerse the channel steel after rust removal into the melting zinc liquid about 440~460℃, so that the surface of the channel steel is attached to the zinc layer, so as to play the purpose of anti-corrosion.

Zinc-steel balcony guardrail has the following characteristics:

1. welding free assembly design, quick and simple installation.

2. four layers of anti-corrosion treatment, more than 20 years of service life, to solve the traditional products in a short time of rust, powder, cracking and other problems, eliminating product maintenance and update costs.

3. good decorative, rich color, to meet the individual needs of different customers.

4. environmental protection, does not pollute the environment, to solve the problem of ordinary products polluting buildings.

5. good flexibility, the rigidity and flexibility of the substrate make the guardrail products have better impact resistance.

6. electrostatic spraying of the surface of the imitation pond porcelain process, so that the guardrail products have good self-cleaning performance, rain wash and water gun spray can be clean as new.

7. buried installation mode and foot plate installation, that is, save your building foundation costs, but also save land resources.

8. good weather resistance, salt spray resistance and moisture and heat resistance, suitable for use in different regions. Steel stamping accessories, stamping guardrail accessories 32t connector 35t connector 40t connector 45t connector U-card 30*40LN bracket 35LN bracket 40 several brackets ð

The main use of galvanizing is to prevent metal surface corrosion and oxidation.

Mainly used in the following fields:

Construction: Galvanized steel is widely used in the construction industry, such as building frames, roofs and walls. This is because galvanized steel has corrosion resistance and durability, which can extend the service life of the building.

Automotive industry: Galvanized steel is widely used in the automotive manufacturing industry, such as the manufacture of body and chassis. This is because galvanized steel can prevent the corrosion and oxidation of metal parts of the car, thereby extending the service life of the car.

Electrical industry: Cable tubes and cable jackets are usually made of galvanized steel pipes. This is because galvanized steel pipe has corrosion resistance and durability, and can be used in different environments for a long time.

Agriculture and aquaculture: Galvanized steel wire mesh and galvanized steel pipe are widely used in the agriculture and aquaculture industry, such as for fences, poultry houses and livestock houses. This is because galvanized steel wire mesh and galvanized steel pipe can prevent rust and corrosion, thereby extending the service life.

Machinery industry: Galvanized steel plates and galvanized steel pipes are widely used in the machinery manufacturing industry, such as the manufacture of mechanical parts and pipes. This is because galvanized steel plates and galvanized steel pipes have good anti-corrosion properties, which can extend the service life of mechanical equipment.

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.

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.

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.