Cold Rolled Steel/Black Steel Rolled different size
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- Loading Port:
- Shanghai
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 25 m.t.
- Supply Capability:
- 9000 m.t./month
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- Quality Product
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Product Description
Brief Introduction
The Cold Rolled Steel is steel that has been worked below its recrystallization temperature by passing it between a pair of rollers. Recrystallization temperature is the temperature at which grains in the lattice structure of the metal have been rearranged, leaving it free of strain and deformations. The Cold Rolled Steel is pre-treated before being cold rolled with a process known as pickling, which uses strong acids to remove scale and other impurities. The Cold Rolled Steel is then passed through rollers to reduce its thickness. Most cold rolling takes place in multiple passes and as the size of the Cold Rolled Steel is further reduced, its strength and hardness both increase, but its ductility decreases. After cold rolling, heating the metal up in a process known as annealing can restore some of its ductility. The final Cold Rolled Steel may be manufactured in the form of sheets, strips, bars, or other forms.
Specification
1. Thickness: 0.4-2.0mm
2. Width: 900-1250mm
3. Inner Diameter: 508mm
4. Weight of Steel Coil: 3-15MT
5. Heat Treatment: Annealed
6. Margin Status: EC & EM
7. Surface Quality: FB&FC
8. Surface Status: SB & SD
9. Surface Treatment: Oiling
Mechanical Properties
1. Yield Strength: ≤ 320MPa
2. Tensile Strength: ≤ 370MPa
3. Elongation (L=50mm, b=25mm) When:
(1) Nominal Thickness <0.25mm: 30%
(2) Nominal Thickness 0.25mm-<0.40: 32%
(3) Nominal Thickness 0.40-<0.60mm: 34%
(4) Nominal Thickness 0.60-<1.0mm: 36%
(5) Nominal Thickness 1.0-<1.6mm: 37%
(6) Nominal Thickness >1.6mm: 38%
Packing
We use Seaworthy Package to make sure Cold Rolled Steel is well-protected during the long ocean voyage.
Application
1. Base metal for coated and dipped products.
2. Home appliance
3. Precise welding tube
4. Flux cored welding wire
5. Bicycle, battery shell,
6. Automobile fitting, hardware
7. Enameling industry etc.
Superiority
1. High precision of dimensional tolerance
2. Excellent mechanical property such as the yield strength and tensile strength, etc.
3. Being highly resistant to denting
4. Exhibits useful magnetic properties
5. High quality surface finish and get well prepared for the surface coating
6. Available in a variety of sizes and shapes with characteristics useful in a wide range of applications
Chemical Components
Grade | Chemical Components | ||||
C | Mn | P | S | Alt | |
DC01 | ≤0.12 | ≤0.50 | ≤0.035 | ≤0.025 | ≥0.020 |
DC03 | ≤0.10 | ≤0.45 | ≤0.030 | ≤0.025 | ≥0.020 |
DC04 | ≤0.08 | ≤0.40 | ≤0.025 | ≤0.020 | ≥0.020 |
FAQ
1. Do you have QC team?
Yeah, sure, our QC team is very important, they will keep the quality control for our products.for quality inspection every day.
- Q:
- Defects in steel coils can be detected through various methods such as visual inspection, non-destructive testing techniques like ultrasonic testing, magnetic particle inspection, eddy current testing, and radiographic testing. These methods help identify surface defects, internal discontinuities, cracks, or other irregularities in the steel coils.
- Q:
- To ensure the safety of steel coils, various methods are used to protect them from fire and heat. One effective way is by applying a fire-resistant coating, which acts as a barrier between the steel surface and the heat source. This coating prevents direct contact and reduces the chances of ignition or damage. Aside from coatings, steel coils can also be stored in fire-resistant warehouses or storage facilities. These structures are built with fire-resistant materials like concrete or steel and equipped with fire suppression systems such as sprinklers or fire extinguishers. These measures help contain and suppress any potential fire, effectively limiting its spread and safeguarding the steel coils. Furthermore, facilities that handle steel coils often implement fire safety protocols and procedures. These may include regular fire drills, training programs for employees on fire prevention and response, and the installation of fire safety equipment like fire alarms and fire hoses. These measures ensure that any fire incidents can be quickly detected and addressed, minimizing the risk to the steel coils. Overall, protecting steel coils against fire and heat involves a combination of fire-resistant coatings, proper storage in fire-resistant structures, and the implementation of fire safety protocols. These measures work together to mitigate the risk of fire and heat-related damage, ensuring the integrity and safety of the steel coils.
- Q:
- To ensure the quality and integrity of steel coils, non-destructive testing (NDT) methods are employed to inspect them for surface defects. Several common NDT methods are utilized in this process. Visual inspection is one of the most widely used methods, where trained inspectors visually examine the steel coils for visible defects like scratches, cracks, pits, or corrosion. Although this method is simple and cost-effective, it can only detect surface-level defects. Magnetic particle testing (MT) is another commonly used NDT method. It utilizes magnetism to identify surface and near-surface defects in ferromagnetic materials like steel. By applying a magnetic field and iron particles to the steel coil, any defects such as cracks or discontinuities become visible as the iron particles concentrate around them. Liquid penetrant testing (PT) is a different NDT method used for inspecting steel coils. It involves applying a liquid penetrant to the coil's surface, which is drawn into surface defects through capillary action. After removing excess penetrant and applying a developer, the defects become visible as the developer draws out the penetrant. Ultrasonic testing (UT) is widely used to detect both surface and subsurface defects in steel coils. It transmits high-frequency sound waves into the coil and analyzes the reflected waves to identify abnormalities. This method can detect defects like cracks, inclusions, and voids that may not be visible to the naked eye. Additionally, eddy current testing (ECT) is another NDT method for inspecting steel coils. It utilizes electromagnetic induction to detect surface and near-surface defects. By placing a coil carrying an alternating current near the surface of the coil being inspected, any changes in the coil's electrical conductivity caused by surface defects are detected and analyzed to identify and evaluate their severity. In summary, various non-destructive testing methods such as visual inspection, magnetic particle testing, liquid penetrant testing, ultrasonic testing, and eddy current testing are utilized to inspect steel coils for surface defects. These methods ensure the quality and integrity of the steel coils before they are used in various applications.
- Q:
- The process of uncoiling steel coils involves unwinding the tightly wound steel coils using specialized equipment such as uncoiling machines or decoilers. These machines utilize hydraulic or mechanical systems to hold the coil securely while gradually releasing the tension on the coil. As the coil is released, it starts to unwind, with the steel strip gradually straightening out. This process allows for the easy feeding of the steel strip into further production processes such as cutting, stamping, or forming.
- Q:
- Steel coils are inspected for defects using various methods to ensure that the quality of the product meets the required standards. One common method is visual inspection, where trained inspectors examine the surface of the coils for any visible defects such as cracks, scratches, or dents. This is usually done by visual observation or with the assistance of magnifying tools. Another method is magnetic particle inspection, which is used to detect surface and near-surface defects such as cracks or voids. In this process, a magnetic field is applied to the steel coil, and a magnetic powder is applied to the surface. If there are any defects, the magnetic powder will be attracted to them, making them visible to the inspector. Ultrasonic testing is also commonly used to inspect steel coils for defects. In this method, high-frequency sound waves are transmitted into the coil, and the reflected waves are analyzed. Any deviations in the sound waves can indicate the presence of defects such as cracks or voids within the coil. Additionally, eddy current testing is employed to detect defects in steel coils. This method uses electromagnetic induction to generate eddy currents within the coil. Any changes in these currents caused by defects in the material are detected and analyzed by the inspector. Lastly, some steel coils may undergo destructive testing, where a sample is taken from the coil and subjected to various tests such as tension or bend testing. These tests are performed to evaluate the mechanical properties of the steel, which can indirectly indicate the presence of defects. Overall, steel coils are inspected for defects through a combination of visual inspection, magnetic particle inspection, ultrasonic testing, eddy current testing, and potentially destructive testing. These methods ensure that any defects are identified and addressed, ensuring that only high-quality steel coils are delivered to customers.
- Q:
- Coil blanking for irregular shapes can be achieved through various methods. Among these methods, one commonly employed technique is laser blanking. By utilizing a high-powered laser, the shape is directly cut from the coil with exceptional precision. This method proves especially effective for intricate shapes, minimizing wastage. Another approach is water jet blanking, where a forceful stream of water mixed with abrasive particles is employed to cut the shape from the coil. Water jet blanking is particularly suitable for thicker materials or situations where heat sensitivity is a concern. Additionally, die blanking involves the utilization of a die to stamp out the desired shape from the coil. This method is frequently applied in large-scale production runs and can be automated for improved efficiency. Lastly, plasma blanking utilizes a plasma torch to cut the shape from the coil. It is commonly employed for thicker materials or situations requiring high cutting speeds. The choice of coil blanking method for irregular shapes is dependent on factors such as material thickness, shape complexity, production volume, and desired precision. Each method possesses its own advantages and limitations, necessitating careful selection to achieve optimal results.
- Q:Have spent two days making a specialized knife out of 304 stainless steel, after throwing into a log it bent slightly arghhhh. Is it worth continuing to finish it off or start all over again with different kind of steel if so which kind should i use.
- Sorry okorder /... I hope that link works but as you can see you dont want to use 303.304.316,410,416,430 You can get away with 301 but would be best to use 440. It kind of sounds like your a home shop guy. It would be best for you to make a knife out of a1 or d2 tool steel. with these steels you can torch heat them to a red hot heat where a magnet will not stick to them. Then let them cool slowly in the air. After that you can temper in a oven around 400f. This will a very hard long lasting knife. Check OKorder for good steel prices. A1 and D2 are not stainless but they are the best for a home shop. If you go stainless you can buy preharden material but you will have to grind everything. You can also pay someone to harden your knife but dont plan on it being cheap.
- Q:I am building a robot for Bots IQ. In doing so i have the option of building the the armor of my robot out of titanium or tool steel.. which would be the better option.Brief description of Bots IQ: It is a competition where 2 15lb robots go and attack each other with spinning blades, hammers or whatever is designed.
- I would have to say titanium , but in doing so I am having to assume you have access to some very serious machinery.This is because Ti is extremely difficult to work and also work hardens, which could lead to cracking and failure.The other problem is that Ti is also very hard to weld .It seems tool steel is the choice for ease of working and weldability, so unless you can buy the bits you need precut or made then I'd say tool steel,preferably something along the lines of ramax.Your other option is spring steel as this is workable and gets hardened after shaping.
- Q:
- Steel coils are used in the manufacturing of HVAC ductwork as they provide the necessary strength and durability required for the ductwork. These coils are typically processed through a roll-forming machine, which shapes them into the required ductwork profile. The steel coils are then cut to the desired length, welded or joined together, and finally, coated to prevent corrosion and improve the overall performance of the ductwork.
- Q:is it much difference between 1095 and 1080,,,1065,,,1060 or even 1045 steel?please help and thanks!
- Carbon Steel Swords
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