cold rolled steel coil with competetive price

cold rolled steel coil with competetive price

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Loading Port:: Tianjin

Payment Terms:: TT OR LC

Min Order Qty:: 1000 m.t.

Supply Capability:: 10000 m.t./month

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Quick Details

Standard: ASTM, DIN, GB
Steel Grade: Q235B
Place of Origin: Hebei, China (Mainland)
Technique: Hot Rolled
Surface Treatment: Polished
Technique: Cold Rolled
Surface Treatment: Coated

Packaging & Delivery

Packaging Details:	in bundle
Delivery Detail:	25 days after receiving the deposit

Specifications

Hot rolled sheet in coil: Specification 2.0mm-15.5mm;
Material: Q235, SS400, SPHC, 16Mn, 16MnR, 20G, 65Mn.

Sales of the steel products
1. Steel pipes
(1) Seamless steel pipe: material 20#, 45#, 16Mn; Specification dia:57mm-dia:630mm.
(2) High-frequency welded pipe: material Q235A/B; Specification dia:15mm-dia:159mm.
(3) Galvanized pipe: material Q235A/B; Specification dia:15mm-dia:80mm.
(4) Stainless steel pipe: material 304, 316, 321, 430; Specification dia:15mm-dia:159mm.
(5) Cast iron pipe: material is spherulitic graphite cast iron, 18#, 22# pig iron.
2. Steel plate
(1) Cold rolled sheet in coil, cold rolled sheet in box: Specification 0.4mm-3.0mm; Material: ST12, SS400, SPHC.
(2) Hot rolled sheet in coil: Specification 2.0mm-15.5mm;
Material: Q235, SS400, SPHC, 16Mn, 16MnR, 20G, 65Mn.
(3) Medium plate: Specification 8.0mm-100mm; Material Q235, 65Mn, 16MnL.
(4) Galvanized sheet: Specification 0.4mm-3.0mm
(5) Stainless steel sheet: Specification 0.3mm-2.0mm; Material 304, 316, 321, 430.

Q: I understand that damascus sword steel was made by folding the strip of steele double , reheating, hammering, folding again and so forth hundreds of times. Was this the same or very nearly the same techmique the japs used making the sword blades the samari swords?(forgive the misspelling): Damascus: A folding technique where the steel is folded over itself many (generally up to sixteen) times, leading to hundreds or even thousands of layers (one fold = 2 layers, two folds = 4 layers, three folds = 8 layers, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, etc.). More folds than sixteen are pointless, as the layers would become thinner than one molecule - which is impossible. This method was developed to removed impurities from the steel (it also removes carbon, which is bad, but can be compensated for to some degree), but modern steel is so pure that Damascus folding is no longer needed. It is now used for aesthetic reasons; Damascus steel looks really good; you can see the layers in the blade. San Mai: Translates to three layers. Layers of softer, lower carbon steel (or iron) is forge welded to layers of harder, higher carbon steel. The lower carbon steel forms the core (and sometimes the sides and/or back), and the higher carbon steel forms the edge. The hard edge will hold its sharpness, the softer core provides shock absorption; making the sword harder to break. Unlike Damascus, San Mai is still very practical. San Mai folds should be invisible; if you can see a San Mai fold the forging was flawed and the blade should be discarded - you'll have to trust your seller that the blade is San Mai - you can't tell by looking. San Mai can be revealed by etching the blade with acid, such as lemon juice, but I don't recommend trying this unless you know what you're doing; you can permanently stain the blade. San Mai swords are more durable (and more expensive) than simple blades. They are more durable (and usually less expensive) than Damascus blades. A blade can be either San Mai or Damascus, or it can be both; Damascus steel which is then San Mai folded. Very cool, looks good and lasts long.

Q: I have heard using the BRASS casing is the best thing for an AR-15? Should i just use Brass or Steel?: No. People who say that don't use steel cased ammo. It it said its harder on the extractor. I don't see how. Its dirtier because it doesn't expand like brass does but the steel casing is still softer than the steel of the gun. That is a mild steel which isn't as hard as what most people are thinking of.

Q: All the appliances in my kitchen are stainless steel, and I hate how they look becuase every time I wash them they are full of streaks. Is there a good cleaner made for stainless steel that won't leave streaks?: WD40 is great for cleaning stainless steel anything for some reason it protects it from finger prints things so you won't have to clean it as often. WD40 is great for thousands of other uses too, it can remove stickers, dried paint from glass, wipes away crayon wax, lubricates squeeky parts, spray it on your lawnmower or bike before you put it away for winter it'll come out in spring rust free.... so you'll get more than your moneys worth from a small tin.

Q: How are steel coils packaged for transportation?: Steel coils are typically packaged for transportation by wrapping them tightly with steel straps or bands to secure them in place. The coils are usually placed on wooden pallets or skids for easy handling and loading onto trucks or shipping containers. Additionally, protective materials such as cardboard or plastic edge protectors may be used to prevent damage to the coils during transportation.

Q: How do steel coils contribute to the energy efficiency of buildings?: Steel coils contribute to the energy efficiency of buildings in various ways. Firstly, steel coils are commonly used in the construction of roofing systems. These coils are typically coated with reflective materials that help to reduce heat absorption from the sun. By reflecting sunlight away from the building, steel coils can significantly reduce the amount of heat that enters the building, thereby reducing the need for air conditioning and cooling systems. This, in turn, leads to lower energy consumption and reduced electricity bills. Additionally, steel coils are often used in the insulation of buildings. Steel coil insulation acts as a barrier against heat transfer, preventing heat from escaping in colder months and entering the building in warmer months. By effectively insulating the building, steel coils help maintain a consistent internal temperature, reducing the need for heating or cooling systems. This results in lower energy consumption and enhanced energy efficiency. Furthermore, steel coils are known for their durability and longevity. Their high strength and resistance to corrosion make them ideal for constructing energy-efficient buildings. By using steel coils in the construction process, buildings can be designed with thinner walls while maintaining structural integrity. Thinner walls allow for increased insulation space, enabling better energy efficiency and reducing the overall energy demand of the building. Moreover, steel coils are also recyclable, making them an environmentally friendly choice for building materials. The recycling process of steel coils requires significantly less energy compared to the production of new steel, thereby reducing carbon emissions. By using recycled steel coils, buildings can contribute to sustainable construction practices and help reduce their environmental impact. In conclusion, steel coils contribute to the energy efficiency of buildings through their reflective properties, insulation capabilities, durability, and recyclability. By utilizing steel coils in roofing and insulation systems, buildings can reduce heat absorption and heat transfer, leading to lower energy consumption and enhanced energy efficiency. Additionally, the use of steel coils supports sustainable construction practices, promoting a greener and more environmentally friendly approach to building design.

Q: How are steel coils used in the production of steel framing systems?: Steel coils are used in the production of steel framing systems as they are typically unwound and fed into a roll forming machine where they are shaped into the desired profiles and sizes required for the framing components.

Q: What are the different methods of storing steel coils?: There are various ways to store steel coils depending on the specific requirements and limitations of the storage facility. Some commonly used methods include: 1. Stacking: Steel coils are stacked on top of one another in a stable manner, maximizing vertical space. However, careful stacking is necessary to maintain stability and prevent damage. 2. Block stacking: Steel coils are arranged in blocks, with each coil placed directly on top of another. The blocks are then stacked to optimize space. This method provides stability and easy access to individual coils, but additional equipment may be needed to prevent damage. 3. Coil cradles: These are specialized racks or frames designed to hold steel coils horizontally. They offer support and prevent rolling or shifting, making them suitable for smaller coils or when quick access is required. 4. Coil saddles: U-shaped frames specifically designed to hold and support steel coils vertically. They are often used in conjunction with block stacking or stack storage methods, providing stability and preventing rolling or collapsing. 5. Coil racks: Steel structures designed to hold multiple coils in an organized manner. They can have multiple levels or tiers, maximizing space efficiency. Coil racks are typically used for larger coils and can be customized for specific dimensions. 6. Automated storage systems: In large-scale facilities, mechanical systems such as coil cranes or coil carousels are used to transport and store steel coils. These systems ensure efficient and fast retrieval in high-volume operations where frequent coil handling is necessary. When determining the most suitable storage method for steel coils, factors such as size, weight, accessibility, and environmental conditions should be considered. Proper handling, labeling, and regular inspections are also crucial for maintaining the integrity and longevity of the stored coils.

Q: What are the challenges in welding steel coils?: In order to guarantee successful and high-quality welds, it is necessary to address various challenges encountered when welding steel coils. One primary challenge involves achieving appropriate joint preparation. Steel coils often exhibit different surface conditions, such as rust, scale, or oil, which must be cleaned or eliminated before welding. This demands extensive cleaning and preparation to establish a clean and reliable welding surface. Another challenge lies in controlling the heat input. Due to the thin nature of steel coils, excessive heat can result in distortion, warping, or even burn-through. Welding operators must exercise careful control over the heat input to prevent such issues and uphold the integrity of the coils. Additionally, the presence of residual stresses poses a significant difficulty. Steel coils typically endure various stresses during the manufacturing, transportation, and handling processes, which can lead to distortion or cracking during welding. To mitigate these stresses and prevent potential defects, sufficient preheating and post-weld heat treatment may be necessary. Ensuring proper weld penetration is also of utmost importance. Steel coils often possess varying thicknesses, making it challenging to achieve consistent and adequate weld penetration throughout the joint. Welding operators must select appropriate welding parameters and techniques to guarantee complete fusion and a robust bond. Lastly, the size and weight of steel coils can create logistical challenges during welding. Specialized equipment and precise positioning are required to handle large and heavy coils, ensuring safe and efficient welding. Additionally, the length of the coils may necessitate multiple passes or continuous welding, demanding skilled operators and meticulous coordination. In conclusion, welding steel coils necessitates careful attention to joint preparation, heat control, stress relief, weld penetration, and logistical considerations. Overcoming these challenges guarantees the production of welded steel coils that are of high quality and durability.

Q: How are steel coils inspected for camber?: Steel coils are inspected for camber by using a straight edge or a camber gauge, which is placed on top of the coil to measure any deviation from straightness. The operator checks the distance between the straight edge and the coil at various points along its length to determine the amount of camber present.

Q: What are the different types of steel coil surface finish treatments?: There are numerous options for treating the surface finish of steel coils, each serving a distinct purpose and offering unique qualities. Several common types include: 1. Hot Rolling: This is a fundamental and widely-used treatment method for steel coil surface finish. It involves heating the steel above its recrystallization temperature and then rolling it to achieve the desired thickness. This process yields a rough surface texture. 2. Cold Rolling: In contrast to hot rolling, cold rolling involves rolling the steel coil at room temperature. This treatment produces a smoother surface finish with improved dimensional accuracy and tighter tolerances. 3. Galvanization: Galvanization is a process in which a protective zinc coating is applied to the surface of the steel coil. This treatment not only enhances the appearance, but also provides excellent corrosion resistance, making it suitable for outdoor applications. 4. Electro-Galvanization: Similar to galvanized steel, electro-galvanized steel coil is coated with a layer of zinc. However, this coating is applied through an electroplating process, resulting in a thinner and more controlled coating. 5. Pre-Painting: Pre-painting involves applying a layer of paint or protective coating to the steel coil before it is delivered to the customer. This treatment enhances the appearance and provides additional protection against corrosion. 6. Stainless Steel: The surface finish treatment for stainless steel coils involves passivating the steel to remove any impurities or contaminants on the surface. This process improves corrosion resistance and gives the steel a clean and smooth appearance. 7. Embossing: Embossing is a treatment where a pattern or design is pressed into the surface of the steel coil. This treatment enhances the aesthetic appeal and can provide added grip or texture, depending on the specific design. 8. Brushing: Brushing is a treatment that involves using a fine abrasive material to create a brushed pattern on the surface of the steel coil. This finish provides a unique texture and can help conceal scratches or imperfections. These are just a few examples of the different surface finish treatments available for steel coils. The choice of treatment depends on the specific requirements of the application, such as appearance, corrosion resistance, or functionality. It is crucial to select the most suitable treatment to ensure the desired outcome.

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