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If China Galvanized Steel Roofing Sheet for sale is used for too long or not used for a long time, it may age. Why do you say that long-term construction or storage must be exposed to the sun? After a long period of exposure to light, aging will occur, which we can't avoid, but we can prevent the speed of aging in advance, so what should we do? 

The first necessary condition for the aging or photochemical reaction of the color-coated plate is that the surface component of the low price color corrugated steel sheet can absorb the radiant energy; secondly, when the radiant energy absorbed by the molecule is greater than the molecular bond energy, the coating of the color-coated plate can be degraded. The shorter the wavelength of the light, the higher the energy it contains. 

According to the above theory, the aging of the low price color corrugated steel sheet in the atmospheric environment is that the coating molecule absorbs energy in the ultraviolet light band of the solar light higher than its molecular bond energy, resulting in degradation of the coating molecule. As the coating film ages, the base body gradually loses, and the surface of the coating gradually becomes rough and loses light. This loss of the binder ultimately leaves relatively stable pigment particles which remain as unbonded powder on the surface of the coating film, a process known as pulverization. 

In summary, polyester coatings with different coating thicknesses have great differences in aging resistance, thin coatings have poor aging resistance, and normal aging coatings have relatively good aging resistance. 

Therefore, the method of reducing the production cost of the color-coated plate by reducing the coating is not feasible, which will inevitably bring serious quality problems. At the same time, it also demonstrates from the side that the coating thickness of the foreign cheap color corrugated steel sheet in stock importer clearly indicates the coating thickness. 

The fast working grinding wheel type

Parallel long life grinding wheel: mainly used for cylindrical grinding and edge machining of cemented carbide.

Parallel arc grinding wheel: mainly used for forming grinding of hard alloy and forming grinding of circular arc surface.

Double-sided concave grinding wheel: mainly used for grinding measuring tools and coreless grinding machines.

Double beveled fast working grinding wheel: mainly used for forming grinding of hard alloy gear hobs and thread cutters.

Bowl-shaped grinding wheel: mainly used for sharpening of carbide tools, high-speed steel tools, and also for milling and grinding of hard alloy gear hobs and thread cutters.

Cold rolled steel coil factory supplier tells you what a cold rolled sheet is.

The production of cold rolled strip requires not only high precision of surface and dimension, straight shape of strip, but also good structure and properties. Cold rolled strip has the following characteristics in rolling process:

Because cold rolling takes place below the recrystallization temperature of metals, the strength and hardness of metals increase while the plasticity decreases during cold rolling. This phenomenon is called work hardening. The result of work hardening is that the deformation resistance increases, the rolling pressure increases, the plasticity decreases, and brittle cracks easily occur. After work hardening exceeds a certain degree, the rolled piece will be too hard and brittle to continue cold rolling. Therefore, after a certain pass of cold rolling, the steel plate is often softened (recrystallization annealing, solution treatment, etc.) to make the rolled piece plastic, reduce the deformation resistance, so as to continue rolling thin.

If you want to know about cold rolling and hot rolled steel coil prices, please contact me.

GI steel coil with spangles in stock has been widely used in construction, home appliances, and other major industries since its introduction. Due to the ever-expanding range of use, the product's formability and various properties of the steel sheet are continuously improved, and thus the aluminum-zinc-plated steel sheet which is superior to the hot-dip galvanized steel coil in some properties is produced. The hot sale aluminum zinc steel coil is an AL-Zn combined aluminum-zinc-plated steel sheet obtained by hot dip coating on a cold-rolled hard steel sheet of various strengths and thicknesses. The coating composition is 55% aluminum, 43.5% zinc, 1.5% silicon and appropriate trace elements.

GL Galvalumed coil performance is superior to hot-dip galvanizing in production and processing.

1. Processing performance
China aluminum zinc steel coil is similar in processing performance to hot-dip galvanizing, and can fully meet the requirements of rolling, stamping, bending and other forms of processing.

2.Corrosion resistance
The test was carried out under the premise of hot-dip galvanized steel sheets and galvanized steel sheets of the same thickness, plating and surface treatment. Aluminized zinc has excellent corrosion resistance than hot-dip galvanizing, and its service life is 2-6 times that of ordinary galvanized steel.

3.Light reflection performance
Aluminized zinc reflects twice the heat and light of galvanized steel and has a reflectance greater than 0.70, which is better than the 0.65 specified by EPA Energy Star.

4.Heat resistance
Ordinary hot-dip galvanizing products usually use a temperature not exceeding 230 degrees, 250 degrees will change color, and galvanized sheets can be used for a long time in a 315-degree environment without discoloration. In the environment of 300 degrees for 120 hours, the color change of the galvanized steel sheet treated by Baosteel heat-resistant passivation is much lower than that of aluminum and aluminized sheets.

5.Mechanical properties
The mechanical properties of aluminum zinc steel coil are mainly expressed in yield strength, tensile strength, and elongation. Ordinary DC51D grade 150 g / square galvanized steel, the general yield strength is between 140-300mpa, a tensile strength between 200-330, elongation between 13-25. The grade of DC51D+AZ galvanized 150g/sqf galvanized steel sheet yield strength between 230-400mpa, a tensile strength between 230-550, and elongation rail between 15-45.

The hot rolled steel coil is used as the raw material, and the oxide scale is removed by pickling, and then the cold rolling is performed. The finished product is rolled hard roll, and the cold work hardening caused by the continuous cold deformation causes the strength and hardness of the rolled hard roll to rise, and the toughness index decreases. Therefore, the punching performance will deteriorate and can only be used for parts that are simply deformed. Rolled hard rolls can be used as raw materials for hot-dip galvanizing plants because the hot-dip galvanizing units are equipped with an annealing line. The hard roll weight is generally 6~13.5 tons, and the inner diameter of the coil is 610mm.
Generally, cold-rolled rolled sheets and coils should be subjected to continuous annealing (CAPL unit) or hood furnace annealing to eliminate cold work hardening and rolling stress and achieve the mechanical properties specified in the corresponding standards.
The surface quality, appearance and dimensional accuracy of the high quality cold rolled steel coil china are better than that of the hot-rolled coil, and the thickness of the product is thinly rolled to about 0.18mm, which is favored by the majority of users. Deep processing of products with cold-rolled steel coils as a substrate has become a high value-added product. Such as electro-galvanizing, hot-dip galvanizing, fingerprint-resistant electroplating zinc, high quality PPGI prepainted galvanized steel coil and vibration-reducing composite steel plate, PVC laminated steel plate, etc., so that these products have good quality, high corrosion resistance, and other excellent quality, has been widely used. Cold rolled steel coils must be finished after annealing, including cutting, tailing, trimming, leveling, leveling, rewinding, or longitudinal shearing. Cold-rolled sheet punching nets are widely used in automobile manufacturing, home appliances, instrument switches, construction, office furniture, and other industries.

Galvanized sheet is a steel plate with a zinc coating on its surface. Galvanizing is an economical and effective anticorrosive method which is often used. About half of the world's zinc production is used in this process.

Definition of China Galvanized Steel Roofing Sheet for sale is coated with zinc metal to prevent corrosion on the surface of the steel sheet and prolong its service life. This kind of thin galvanized steel sheet is called galvanized steel sheet.

The classification and use of galvanized sheets can be divided into the following categories according to production and processing methods:

The hot dip galvanized steel coil for sale. The thin steel plate is immersed in the molten zinc bath to make its surface adhere to a layer of zinc thin steel plate. At present, the continuous galvanizing process is mainly used to produce galvanized steel sheets, that is, coiled steel sheets are continuously immersed in a galvanized bath to produce galvanized steel sheets.

Galvanized steel sheet. The galvanized steel sheet produced by electroplating has good processability. However, the coating is thinner and the corrosion resistance is not as good as that of hot-dip galvanized sheet.

Single-sided and double-sided galvanized steel sheets. One-sided galvanized steel sheet, that is, only one-sided galvanized products. It has better adaptability than a double-sided galvanized sheet in welding, painting, anti-rust treatment, and processing. In order to overcome the shortcomings of the single-sided galvanized sheet, there is another kind of galvanized sheet coated with thin zinc on the other side, that is, double-sided difference galvanized sheet.

Which is better for GI steel coil with spangles manufacturer? Many mechanical parts are required to be hot-dip galvanized. In particular, some standard parts may have higher requirements for this kind of process technology. At present, China's hot-dip galvanizing process is also constantly improving, and the technical level is also There have been great improvements. For the vast majority of consumers, it may not be well understood by hot-dip galvanizing manufacturers at the beginning, which may result in the inability to find a suitable supplier.

Galvanized Steel Coil China manufacturer is a large number because the country has many years of production experience, so it is currently a very influential manufacturer worldwide.

Can not only look at the hot dip galvanized steel coil price cheap, some machinery manufacturers in order to reduce costs, do not hesitate to use some small manufacturers of hot-dip galvanizing, but this method often cannot get more qualified products, so in order to improve hot-dip galvanizing processing The overall production process and product performance, it is recommended that the majority of manufacturers choose some large suppliers when choosing suppliers.

Many consumers may not know much about the hot-dip galvanizing process. So, this is actually not very worrying. You can query the relevant questions through the network. I believe that you can quickly get a lot of information about this.

China grinding wheel supplier clearly knows that around grinding machine is an indispensable tool for woodworking. Has a good grinding effect. The disadvantage is that sandpaper is expensive, and the second disadvantage is that the corners cannot be polished. 

The characteristics of the round mill:

1. The grinding speed is fast, which effectively shortens the working time.

2. Lightweight, high balance, long-term use without fatigue.

3. The dust collecting dust collector can effectively achieve the dust collecting effect without causing dust particles to be scattered. 

The purpose of the round mill:

1. Automobile sheet metal painting operation.

2. Metal plate grinding, grinding, dressing, feathering.

3. Woodworking furniture, rims, metal grinding. 

China grinding wheel supplier

Company Name: Henan Aurora Abrasive Tool Co., Ltd.

Address: No.55, Lotus Street, High Tech Zone, Zhengzhou city, Henan Province, China

Email: [email protected]s.org

The low price grinding disc is suitable for surface grinding, cylindrical grinding, internal grinding, and cutting of various materials. For example cemented carbide, ceramic, tungsten steel, glass, precious stones, etc. 

Its structure generally consists of three parts: the working layer, matrix and transition layer.

1. The working layer, also known as the diamond layer, consists of abrasives, binders, and fillers and is the working part of the grinding wheel.

2. The transition layer, also known as the non-diamond layer, consists of a binder, a metal powder and a filler, and is a portion that firmly bonds the diamond layer to the substrate.

3. The base body is used to support the abrasive layer and is firmly clamped on the spindle of the grinding machine by a flange when in use. Generally, metal bond products are selected from steel and alloy steel powder as a matrix.

The problems that should be paid attention to when using 4.5 inches grinding wheel.

1. Grinding wheel should be inspected before installing the fan to see if there is any crack, and use a wooden hammer to strike the grinding wheel to hear if there is abnormal sound. If there is, the cooling fan can not be used, so as to avoid the damage caused by the grinding wheel.

2. For new or alternate use of resin 4.5 inches grinding wheel, it should be idle for more than one minute before use. If everything is normal, it can be used according to the safety regulations of grinding machinery.

3. Since the resin grinding wheel is brittle and fragile, please do not let it be impacted, collided, or fall. Store it with anti-freeze and moisture-proof. Keep the room cool and ventilated, place it flat, stack it neatly, pay attention to dust proof, keep the unused grinding wheel clean, and do not press it.

4. When installing the grinding wheel, the center of the resin 4.5 inches grinding wheel must be found. At the same time, the flange should be fastened. After installing the flange, the outer circle of the grinding wheel should be checked whether it is concentric with the main shaft. The resin grinding wheel has at least one side perpendicular to the center line of the main shaft.

5. After installing the grinding wheel, for safety reasons, please do not install the qualified protective cover before starting the machine.

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