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.

Decarbonization is not only related to temperature, but also depends on the type of metal or alloy, and depends on the heating medium. For example, silicon steel is easy to decarbonize, stainless steel is not easy to decarbonize, heat-resistant steel is not easy to decarbonize, if it is a reducing medium, you heat to the melting state will not decarbonize, if it is an oxidizing medium, it mainly depends on the level of oxidation, if it is heated in the air, the decarbonization situation is more difficult to say, only specific problem specific analysis, general carbon steel about 570 Degree produces strong oxidation decarburization.

Decarbonization or not has a lot to do with chemical composition, heating temperature, holding time, the existence form of carbon in the metallographic organization, and environmental atmosphere. Chemical composition alone cannot determine the heating temperature required to decarbonize the surface of the material.

The surface decarburization of steel materials is related to the carbon content or carbon equivalent. Taking 60Si2Mn as an example, the decarburization sensitive zone is about 1150-1250 degrees.

Decarbonization is also related to the heating atmosphere and heating time.

Another thing to consider is that oxidation and decarbonization generally exist at the same time, if the oxidation rate is greater than decarbonization, then even in the high temperature zone will not cause material decarbonization, but the surface oxide thickness increases. 35CrMo is generally used for the production of high-strength fasteners, which generally requires the spinning temperature not to exceed 880 degrees, the cooling speed in the range of 0.8-0.85 degrees /s, and the decarburization layer can be controlled between (0.2-0.4)D%. This decarbonized layer is tolerable and subsequent cold heading and mechanical properties can be guaranteed.

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.

1. The advantages of galvanized steel plate as a flower bed:

Galvanized steel plate as a flower bed has corrosion resistance, reliability, and galvanized steel plate as a flower bed can be good oxidation resistance, durable use, is a very good plate type. The surface oxidation resistance is strong, and the corrosion resistance inside the flower bed can be strengthened.

Galvanized steel plate as a flower bed has the advantages of integrity and maintenance-free, so that every part of the surface of the plating can be well and evenly plated with zinc, even in the depression, sharp corners and hidden places can be fully zinc. The galvanized steel plate is durable and used in the flower bed, and the standardized galvanized rust prevention layer in the outdoor environment can be maintained for 10 years without repair.

2. the shortcomings of galvanized steel plate to do flower beds

When the galvanized steel plate does subsequent processing of the flower bed, it may show linear dark lines on the surface of the board, and there are bumps and obvious tactile feelings in serious cases, sometimes it is not clearly visible, and it is easy to show dark lines or black spots. Therefore, the general galvanized steel flower box will add a layer of high temperature paint, which is not only more beautiful, but also waterproof and rust prevention and a layer of protection.

Galvanized iron pot boiling water is not toxic. Galvanized iron sheet is what we commonly call galvanized iron sheet, galvanized iron sheet is often made into a variety of buckets, basins and kettles.

Iron and zinc are both metallic elements, they do not dissolve in water, with galvanized iron pot boiling water is also drinkable. Zinc and iron are both essential trace elements for the human body, and even if there is a little in water, it is also beneficial to the human body.

However, galvanized sheet in the process of galvanizing, with chemical reactions, it is inevitable that a small amount of harmful substances will be mixed, long-term use of harmful substances will precipitate, and a long time may cause damage to the human body. It is recommended that consumers choose 304 or 316 food set stainless steel kettle for water.

Galvanized iron pot boiling water is not toxic. Galvanized iron kettle is made of sheet iron, even if heating will not change, and there is no harm to the human body, but long-term heating of the kettle inside will produce scale, so it should be dealt with in time.

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!

Steel is generally divided into four categories, profiles, plates, building materials, pipes. Among them, the materials of profiles and plates are mainly classified as Q235B, Q345B and Q355B, while the main material of building materials is HRB400E, and the material of pipes is also mainly Q235B. The types of profiles are H-shaped steel, I-beam steel, channel steel, Angle steel. Among them, the plates are medium and thick plates, pattern plates, pattern rolls and open plates.

Steel is generally divided into four categories, profiles, plates, building materials, pipes. Among them, the materials of profiles and plates are mainly classified as Q235B, Q345B and Q355B, while the main material of building materials is HRB400E, and the material of pipes is also mainly Q235B. The types of profiles are H-shaped steel, I-beam steel, channel steel, Angle steel. Among them, the plates are medium and thick plates, pattern plates, pattern rolls and open plates. The types of building materials are mainly seismic disk screw, three seismic rebar, four seismic rebar. The types of pipe mainly include black square pipe, black rectangular pipe, galvanized rectangular pipe, galvanized square pipe and so on.

1. steel high strength, plasticity, heat resistance, good toughness;

2. uniform steel material, high reliability;

3. the steel structure is simple to make, the construction period is short, with good assembly;

4. the steel has weldability;

5. the steel has no leakage, easy to make closed structure;

6. steel is closer to homogeneity and isotropy.

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.

Exposed structural steel refers to the structural form that keeps the details of steel structure and its joints visible under the premise of meeting the quality requirements of steel structure in the building.

What are the requirements of the AESS standard for the processing of steel profiles?

1. No steel mill rolling trademarks, steel marks or raised marks are allowed;

2. It is forbidden to lift steel and components with bite printing;

3. During assembly, it is forbidden to weld temporary support on the exposed surface of components, and it is forbidden to hammer;

4. Minimum weld exposure;

5. the butt weld width is consistent, straight, and polished to flush with the base material, weld residual height is zero;

6. grinding along the weld length direction, the vertical direction of grinding is easy to lower than the base metal surface;

7. After shot blasting or sandblasting, the visible defects shall be welded and filled or polished to remove the defects.

The chemical composition and mechanical properties of 12Cr1MoV alloy structural steel are excellent, the tensile strength and yield point are above the standard, but also has high plasticity and oxidation resistance. It is widely used in high pressure, ultra high pressure, subcritical superheater, collecting box and main steam conduit. Not only that, the process and weldability of this steel is also excellent.

The two digits at the beginning of the steel number represent the carbon content of the steel, which is expressed by a few millionths of the average carbon content. For example, 40Cr and 25Cr2MoVA alloy tubes, the main alloy elements in the steel are generally expressed by a few percent, except for some microalloy elements. When average alloy content < 1.5%, generally only the element symbol is marked in the steel number, but not the content, but in special circumstances easy to confuse, the element symbol can be marked with the number "1"; The alloy elements in steel, such as vanadium V, titanium Ti, aluminum AL, boron B and rare earth RE, all belong to microalloying elements. Although the content is very low, they should still be marked on the steel number. For example, in 20MnVB steel. Vanadium is 0.07-0.12% and boron is 0.001-0.005%. High quality steel should be added "A" at the end of the steel number to distinguish it from ordinary high quality steel. Special purpose alloy structural steel with a prefix (or suffix) denoting the purpose of the steel. For example, the 30CrMnSi steel specially used for riveting screws is expressed as ML30CrMnSi.

1. Steel used as parts of various machines. It includes carburizing steel, tempering steel, spring steel and rolling bearing steel.

2. Steel used for engineering structures. It includes carbon steel A, B, special steel and ordinary low alloy steel.

What is the material of steel S400

S400 is JIS standard of Japanese steel, equivalent to the domestic Q235A structural steel, can be used for casting, used in casting steel. S400 is a Japanese brand, and the common structural steel in JIS series is mainly composed of three parts: the first part is the material, such as: S for steel, F for iron; The second part represents different shapes, types and uses, such as P for plate, T for tube, K for tool; The third part shows the characteristic number, which is generally the minimum tensile strength. For example: SS400 - the first S represents steel, the second S represents "structure", 400 is the lower limit tensile strength of 400MPa, the overall tensile strength of 400 mpa ordinary structural steel.

0.4 thick 36 wide galvanized steel pipe what use point ability to take on the head how? 1, the former life level, almost the use of forged home code, if the sink, kitchen table, will be used in addition to such kitchen equipment, in addition to such door. 2, located in the counterfeit feeling, ready to ceiling, wall, rolling shutter door, warm tube shell, water baffle, can be used for us also for a very long time to take good care of the new wall. 3, the use of children's clothes in the home can be used, especially refrigerators, washing machines, vacuum cleaners in household appliances, the outbreak of kindness plus such care and use. Advice through the immediate point of simple and ceremonious recommendation, buy for us 0.4 thick 36 wide galvanized steel pipe should be from what kind of take on the head a point to discuss understanding, rescue life is located in the choice of quality 0.4 thick 36 wide galvanized steel pipe what to do, good point for the use of application function use ability. When it comes to the use of 0.4 thick and 36 wide galvanized steel pipe, you may identify the Shengmin. Also protect every assembly point corrosion resistance. The good point corrosion resistance takes good care of the assembly point for the use of the application function to use the birthday, always the point for the use of the application function to use the birthday and if the point is set up, it has got quite a lot of card players. Buy for us 0.4 thick 36 wide galvanized steel pipe should be from what kind of strap on the head a point to discuss understanding, rescue life in the choice of quality 0.4 thick 36 wide galvanized steel pipe for what, good use point for the use of application function.

Structural steel is a type of steel used to make building materials of various shapes. Many structural steel shapes take the form of long thin beams with a specific cross-section profile. In most industrialized countries, the shape, size, chemical composition, mechanical properties (such as strength), storage methods, etc. of structural steel are regulated by standards.

Most structural steel shapes, such as i-beams, feature a high area of secondary moments; they are very rigid in the installation relative to their cross-sectional area, so they can support high loads without excessive sagging.

Q195, Q215, Q235, Q345

Q235 represents: carbon structural steel - general plate is a kind of steel material. Q is the yield of this material, and 235 is the yield of this material, which is around 235. The yield value will decrease with the increase of material thickness.

Q235A, Q235B, Q235C, Q235D. This is the grade of distinction, represents, mainly the impact of the temperature is different!

A, B, C, D, the difference is the impact temperature in their performance. They are: Q235A, no impact; Grade Q235B, is 20 degrees room temperature shock;

Grade Q235C, 0 degree impact; Grade Q235D, it's a -20 impact. At different impact temperatures, the impact values are also different.

Element content: Sulfur content of A, B, C and D decreased successively; A and B have the same phosphorus content, followed by C, and D has less phosphorus content.

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.

With the continuous expansion of the use of hot galvanized sheet, the following purposes can be achieved by polishing the strip steel in the modern continuous hot dip galvanizing unit:

(1) Improve the flatness and flatness of the sheet, but also the surface of the zinc particle flattening, so that the surface of the strip smooth, which is especially advantageous for later deep drawing and other occasions with higher precision;

② The polishing roll used has been pre-shot peening, so the surface of the plating plate has a certain roughness after polishing. It can improve the adhesion of the coating, but also can store a certain amount of grease, in the deep drawing process, the lubrication of the die is beneficial;

③ For the plating plate after painting treatment, although the surface is controlled into small zinc flowers, small zinc flowers can still be exposed through the paint layer. Therefore, for some high requirements of galvanized sheet, small zinc flower surface needs to go through polishing treatment. This can make the galvanized sheet obtain a more uniform silver appearance;

(4) By finishing, the lower yield point can be reduced to make the yield platform disappear or less obvious, which can prevent the slip line in the future drawing or deep drawing, and improve the possibility of deep drawing.