Chinese Best Cold Rolled Steel Coil JIS G 3302--Smooth and Flat Surface

Chinese Best Cold Rolled Steel Coil JIS G 3302--Smooth and Flat Surface System 1

Chinese Best Cold Rolled Steel Coil JIS G 3302--Smooth and Flat Surface System 2

Chinese Best Cold Rolled Steel Coil JIS G 3302--Smooth and Flat Surface

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Loading Port:: China main port

Payment Terms:: TT OR LC

Min Order Qty:: 50 m.t.

Supply Capability:: 10000 m.t./month

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Chinese Best Cold Rolled Steel Coil JIS G 3302--Smooth and Flat Surface

1.Structure of Cold Rolled Steel Description：

The raw material of cold rolled steel coil/sheet is high quality hot rolled product, and after pickling continuous rolling, degreasing, annealing,skin pass,slitting and cut to length line etc. Along with it many kinds of new technology and new process of global cold rolling production have been applied. Therefore the quality of the goods could be guaranteed. 2.Main Features of the Cold Rolled Steel：

• Smooth and flat surface

• Workability, durability

• Excellent heat resistance performance

• High strength

• Good formability

3. Cold Rolled Steel Images

Chinese Best Cold Rolled Steel Coil JIS G 3302--Smooth and Flat Surface

4.Cold Rolled Steel Specification

Standard:AISI,ASTM,DIN,GB,JIS,JIS G3302 ASTM 653M EN10142

Grade: Q195~Q345

Thickness: 0.16mm~2.0mm

Width: 1250mm MAX

Coil weight:3-12 MT

Coil ID:508/610mm

5. FAQ of Cold Rolled Steel

1.How to guarantee the quality of the products？

We have established the international advanced quality management system，every link from raw material to final product we have strict quality test；We resolutely put an end to unqualified products flowing into the market. At the same time, we will provide necessary follow-up service assurance.

2. How long can we receive the product after purchase?

Usually within thirty working days after receiving buyer’s advance payment or LC. We will arrange the factory manufacturing as soon as possible. The cargo readiness usually takes 15-25 days, but the shipment will depend on the vessel situation.

Q:how is stainless steel made? what are the things used in making it?: There are 3 basic stainless steels. The Martinsitic, the ferritic, and the Austinistic. The spelling may be wrong on all of them. (Got out of school in 1966 with my metallurgy in 1965. The Ferritic is magnetic and has some resistance to corrosion but the Martinsitic is much more resistant to corrosion. The Austinitic stainless is very resistant to corrosion. The differences are the amount of Chrome and Nickel in the batches. The Austinitic has an 18/8 ratio of Chromium and Nickel with the rest Iron and minor ingredients. The carbon content is very important and these steels are often made in small batches with close monitoring of composition and carbon content. Scrap metals are frequently used with the chrome and nickel being added as carefully selected scrap or even fresh crude stocks. Electric melting is frequent to avoid contamination.

Q:Can steel coils be coated with epoxy?: Yes, steel coils can be coated with epoxy. Epoxy coating provides a protective layer that enhances the durability and corrosion resistance of steel coils.

Q:How are steel coils inspected for flatness variations?: Steel coils are inspected for flatness variations using specialized equipment such as flatness gauges and laser measurement systems. These tools are used to measure the surface profile of the coil, detecting any deviations from the desired flatness tolerance. Additionally, visual inspection and manual measurements by trained professionals are also carried out to ensure accurate assessment of flatness variations in steel coils.

Q:How are steel coils protected against corrosion?: Steel coils are protected against corrosion through various methods such as applying protective coatings, galvanizing, or using corrosion inhibitors. These measures help to create a barrier between the steel surface and the surrounding environment, preventing the onset of corrosion and extending the lifespan of the coils.

Q:Are steel coils used in furniture manufacturing?: Yes, steel coils are commonly used in furniture manufacturing for various purposes such as providing support and stability to seating structures, enhancing durability, and ensuring proper weight distribution.

Q:Ok, lately I've been taking to making things out of stainless steel chain mallie rings. The problem is that when i make a bracelet or something, the area around the fastener always looks pretty bad. I'm thinking to have a friend who also does chain mallie finish the weave all the way around. This would make it look good but make it impossible to remove.Are there any long term problems with stainless steel on skin? I know some metals will change the color of the skin or make the skin absorb some of the metal. Is this something to worry about with stainless steel?: Stainless steel contains both nickel and chromium. These two alloys are responsible for most of contact dermatitis in people. Some of my co-workers making steel had such bad reactions to chromium that they had to quit their jobs. Their skin was always inflamed. People don't react to finished stainless steel the same way because the alloys are bonded tightly in the heat treating process. But if you are grinding it and getting the dust on your skin, you could get a contact dermatitis if you are sensitive. I don't think it would absorb into your blood stream or do any long term damage to your skin. If you do get a reaction, you would have to cease your exposure or in a worse case scenario risk getting a body wide reaction like my coworkers. I would not worry about any exposure making rings out of stainless steel. After all, stainless steel is used in sugical implants and most people are fine.

Q:What are the different methods of levelling steel coils?: There are several methods used for leveling steel coils, depending on the specific requirements and applications. Some of the common methods include: 1. Roller Leveling: This method involves passing the steel coil through a series of rollers that exert pressure on the material, effectively reducing any residual stresses and removing any waviness or curvature. Roller leveling is commonly used for thinner gauge coils where a high degree of flatness is desired. 2. Stretch Leveling: This method involves stretching the steel coil beyond its yield point to eliminate any shape defects. The coil is subjected to tension in a stretcher leveler machine, which elongates the material and removes the inherent stresses. Stretch leveling is often used for thicker gauge coils where a higher degree of flatness is required. 3. Temper Milling: This method involves passing the steel coil through a temper mill, which is a cold reduction mill equipped with work rolls on top and bottom. The temper mill imparts tension on the coil, flattening it and improving its shape and surface quality. This method is typically used for higher strength steel grades. 4. Corrective Leveling: This method is employed when the steel coil has significant shape defects, such as wavy edges or center buckles. Corrective leveling involves selectively removing material from specific areas of the coil to achieve a flat and uniform surface. This process is often done using laser or plasma cutting machines. 5. Tension Leveling: This method is similar to stretch leveling, but it involves applying tension to the coil without exceeding its yield point. Tension leveling utilizes a series of bridle rolls to stretch the material, thereby removing any internal stresses and leveling the coil. This method is commonly used for higher strength and thinner gauge coils. These methods can be used individually or in combination depending on the specific requirements of the steel coil and the desired end product. Each method has its advantages and limitations, and the choice of leveling method will depend on factors such as the coil thickness, material properties, and desired flatness.

Q:What are the quality standards for steel coil manufacturing?: The quality standards for steel coil manufacturing typically include criteria such as dimensional accuracy, surface finish, mechanical properties, chemical composition, and adherence to industry-specific standards like ASTM or EN. These standards ensure that the steel coils meet the required specifications for various applications and provide reliable performance in terms of strength, durability, and consistency. Additionally, manufacturers often follow strict quality control processes throughout the production cycle to ensure the quality of the final product.

Q:What is the process of recoiling steel coils?: The process of recoiling steel coils involves rewinding or unrolling large steel coils to create smaller, more manageable coils. This process is typically carried out in steel processing plants or coil service centers. The first step in the recoiling process is to identify the appropriate coil to be recoiled. This selection is based on factors such as coil size, weight, and quality. Once the coil is chosen, it is placed onto a recoiling machine, which is equipped with various mechanisms to facilitate the recoiling process. The recoiling machine consists of a mandrel or drum, around which the coil is wound or unwound. The coil is secured onto the mandrel, either by mechanical clamps or hydraulic pressure, to ensure it remains stable during the recoiling process. In the case of rewinding or recoiling a large coil into smaller coils, the machine starts by unwinding the original coil. This is done by rotating the mandrel in the opposite direction, causing the coil to gradually unroll. As the coil unwinds, it passes through various straightening and flattening mechanisms, which help to ensure the coils are produced with consistent dimensions and quality. Once the original coil is completely unwound, the machine starts the rewinding process. The smaller coils are created by winding the steel strip onto the mandrel in a controlled manner. The speed and tension of the rewinding process are carefully regulated to prevent any damage to the steel strip. During the recoiling process, various quality control measures are implemented to ensure the produced coils meet the desired specifications. These may include monitoring the thickness, width, and surface quality of the steel strip, as well as conducting periodic inspections to detect any defects or irregularities. Once the rewinding process is completed, the smaller coils are typically removed from the mandrel and prepared for further processing or shipment. This may involve applying protective coatings, labeling, or packaging the coils, depending on their intended use. In summary, the process of recoiling steel coils involves unwinding large coils, straightening and flattening the steel strip, and rewinding it onto a mandrel to create smaller, more manageable coils. This process requires specialized machinery and careful control to ensure the quality and consistency of the recoiled coils.

Q:What is the width range of steel coils?: The width range of steel coils can vary depending on the specific requirements, but it typically ranges from a few millimeters to several meters.

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