On the market today, steel coil is a commonly used type with many different types. However, many people still do not distinguish between the types of steel coils and their uses. Let's find out more about MRS Steel in the following article.
The steel coil is a steel type that is quite commonly used today. This type of steel is produced with a smooth or ribbed surface that is curled together. Making quality steel coils requires a complex steel production process that requires high technical and technological qualifications. Depending on the needs and purposes of use, there will be different types of steel coils.
Hot-rolled coil is the finished product of the process of smelting, casting billets, and hot rolling at a temperature of °C. This steel is the raw material for creating cold-rolled coil, welded steel tubes, and cast steel pipe. Normally, a hot-rolled coil will have a blue-black color and a rough surface that is less aesthetic.
Hot-rolled coils are commonly used in the automobile industry, railways, shipbuilding, roofing corrugated iron, the production of H- and I-shaped steel beams, moving floors, ladders,...
The cold-rolled coil is a hot-rolled coil after cooling and re-rolling at room temperature to produce cold-rolled coil products with the desired shape and size. This process will not change the structure of the steel, but only the shape of the steel in accordance with the needs and purposes. However, if the cold rolling process is not strictly controlled, it will deform the product. The cold-rolled coil has a smooth surface, so it ensures higher aesthetics and durability.
Cold-rolled coils are often used to make flat sheet products such as steel plates, coils, laminates, round and square details,.. and products with smooth surfaces.
The galvanized steel coil is a cold-rolled coil that is additionally plated with a layer of zinc on the outside of the surface. This is one of the most influential and economical methods of protecting steel from corrosion under the influence of the environment.
Galvanized steel coils are widely used in building architecture, roofing, ventilation systems, solar water heaters, televisions, refrigerators, the automobile manufacturing industry, the manufacturing industry,...
Stainless steel is a steel alloy with a minimum chromium content of 10.5%, which is a standard metal in Vietnam and is commonly known as stainless steel. Manufacturers often choose to use stainless steel as a metal production material because it has good corrosion resistance, oxidation resistance, high strength, and does not stain or rust.
Stainless steel is commonly used in many industries and construction projects, such as aerospace, architecture, medical, home appliances, and jewelry...
Pre-painted steel coil, also known as color-coated corrugated iron, is a type of corrugated iron made of galvanized steel coated with a layer of color paint to increase the aesthetics and longevity of the building. Pre-painted steel coil has high strength, good bearing capacity, corrosion and rust resistance, and many different designs and shapes suitable for each type of construction.
Pre-painted steel coils are used to make roofing sheets, rolling doors, interior decoration,... In addition, it is also used to make industrial electrical products, household appliances, insulation systems,...
Buying coils becomes more manageable when many enterprises produce and trade coils in Vietnam. However, buying quality coils at a reasonable cost is not easy, especially for foreign enterprises. With more than 12 years of experience in the steel industry, MRS Steel will help you make the right choice for your project. If you have a need to buy coils, please contact us via:
There you are at the back of the line. The line just shut down because the steel has a bow, preventing the manufacturing of a good part. Where did things go wrong? You know it is not the line, as the last three coils ran without an issue. The steel must be bad. Right?
The above is a frustrating and common situation. This article will look at the common causes of shape issues, such as coil set, edge wave, center buckle, crossbow, camber and explain how Worthington can help you mitigate them. While no one likes the extra cost of having a flatness-critical specification, we will examine when this specification is vital for manufacturing success and will save you a lot of money.
With competitive price and timely delivery, Jinxinda sincerely hope to be your supplier and partner.
When a coil of steel arrives from your flat roll provider, it will always have coil set. You can think of coil set as “the memory” of the steel.” When you uncoil it, the steel remembers that it was in coil, and it will hold onto that shape until you reset its memory with your in-house leveler or straightener.
Whenever the grade or gauge of steel changes, the leveling/straightening equipment must also be adjusted. The more the thickness and strength vary from one changeover to the next, the greater the adjustment may be to remove the coil set. If the leveler or straightener does not have enough power or is not set up properly, the coil set will remain. At Worthington, our metallurgists are available to help our customers with recommended leveler adjustments – we know that this equipment can be a bit of a black box, and we want to ensure it is doing its job effectively.
Edge wave is an edge deformation that occurs when the edges of a coil are longer than the center of the coil. This type of shape deformation is usually addressed with tension leveling, which will hold the length of the edges, with stretching the length of the center to match.
Center buckle is a deformation in the center of the sheet that occurs when the center of coil is longer than the edge of the coil. This shape deformation can also be fixed with tension leveling, but in this case the length of the center is held, while the edges are stretched to match.
Cross bow occurs when the coil edges bow up or down, creating a frown or smiley face. Cross bow can be caused by several varied factors in processing and requires a metallurgist to come on site to troubleshoot.
Camber is a deformation that occurs when one side of the sheet is elongated more than the other. In wide material the longer edge may show up as a wave because the coil is too wide to curve sideways. In narrow material, camber will visibly curve off to one side, or snake back and forth. To address camber a metallurgist will come on site to determine the root cause, and optimal solution.
While extreme examples of shape issues are rare, it is important to realize that there is an expected and allowable amount of shape variation in steel. To make flat roll steel, you turn raw earth, specifically iron ore into metal by heating it, removing its impurities, and pouring it into a large slab. This slab is further reduced into a hot roll sheet product. The rudimentary nature of this foundational process produces the natural variation.
For many applications, like deep-drawn or heavily stamped parts, the natural amount of variation in steel shape within a coil or between coil to coil will not present an issue. However, it is a deal breaker for a shape or flatness-critical application like laser welding. Many manufacturers who need a flatness-critical specification, are surprised by the amount of natural variation in steel when a flatness-critical tolerance hasn’t been specified.
The amount of allowable variation in shape changes with the steel’s gauge and tensile strength. The thicker the gauges and the higher the tensile strength, the more prone the steel is to shape variations. Generally, any tolerance of 12mm (1/2 inch) or less should be considered flatness-critical and require extra processing.
If you are uncertain about the flatness requirements for your specific application, consulting with a metallurgist can be immensely beneficial. A metallurgist is an expert in the properties and behavior of metals, and they can provide valuable insights into the flatness standards and tolerances that are relevant to your application.
Flatness-critical steel applications demand the steel to exhibit extremely low levels of surface imperfections and variations in thickness, as even minor deviations can adversely affect the successful manufacturing and performance of the final product.
Without additional processing, such as tension leveling, temper passing, or stretcher leveling, to reduce shape variations inherent in steel, the material will not achieve the amount of uniformity required by a flatness-critical steel application. For this reason, it is essential to communicate your shape requirements to your flat-roll steel processor, if your application requires it. It is important to note that the additional processing required will increase the overall cost of the material.
While the additional processing required for flatness critical applications may come at an increased cost, it is worth the investment. By ensuring the flatness of the steel, you minimize the risk of downstream issues such as buckling, distortion, or fitment problems. This can save you time, money, and potential rework in the long run, making the extra processing cost well worth it.
At the time of order, Worthington metallurgists conduct a full discovery to understand the customer’s manufacturing processes and how their parts are used in real life. After we have a comprehensive needs assessment, we can ensure proper ordering and processing of the steel. If a shape problem still arises in the manufacturing process, Worthington metallurgists will visit the customer’s plant to troubleshoot the possible root cause(s) of the issue. This may result in customer equipment adjustments or changes to how the steel is ordered.
Are you interested in learning more about industrial hot rolled steel coil? Contact us today to secure an expert consultation!