Defining a steel coil

-
The basic information defining a steel coil.
The coil internal diameter (ID measured in [mm]) depends on the type of re-coiler of the slitting line. Most common bore sizes are 508mm, but also 406 and 610mm are used.
The coil outer diameter (OD measured in [mm]) depends on the capacity of the service center. It must be also checked with the geometrical characteristics of the uncoiler where the metal coil will be processed.
In the following calculations, the thickness (T, measured in [mm]) of the metal coil means the total thickness - including paint if present. In case of coated coils, the thickness of the paint can be between 0,03mm and 0,08mm: note that some producers of coated coils, indicate only the metal thickness on the coil labels. The paint thickness can slightly influence the results of the formulas.
The coil width (W measured in [mm]) is the transversal dimension of the coil, and together with the previous information it allows the calculation of the coil length (L measured in [m]), which is an important data to calculate the quantities that will be produced with one coil.
The material type is important to define the density of the metal (D, measured in [kg/dm^3]). Here are some references for the most common materials:
  • Carbon steel, Galvanized steel and Aluzinc: 7,85 kg/dm^3
  • Stainless steel: 8 kg/dm^3
  • Aluminum: 2,71 kg/dm^3
  • Lead: 11,3 kg/dm^3

Comments

Post a Comment

Popular posts from this blog

Glossary of CR, GLM, GA, GI, PO Steel Coils

-
Cold Rolled Steel(CR): Flat rolled steel products for which the final required thickness has been obtained by rolling base hot rolled pickled substrate at room temperature. This is accomplished by passing the steel through work rolls under tremendous pressure which tightens thickness tolerances, improves shape and surface quality. The initial product comin g through the work rolls is called Cold Rolled Full Hard and from there the coils will need to be Annealed in order to become fully processed Cold Rolled Steel. Galvalume (GLM): Sheet steel is coated with aluminum-zinc alloy using the continuous hot-dipped process similar to the process used to make galvanized steel. The nominal coating composition is 55% aluminum and 45% zinc. Galvalume has superior corrosion resistance which is achieved by the intricate microscopic formation of zinc-rich and aluminum-rich zones within the coating. The aluminum provides long-term durability and zinc the corrosion protection. Galvalume...
Read more

STAINLESS STEEL - POSCO GRADES

-
301 : 17Cr - 7Ni / 301L : 17Cr - 7Ni - LC It has less contents of Cr and Ni compared to that of 304 and is possible to make it possess high strength by further cooling process. And it is mainly used for springs and the train interior and exterior panels. 304 : 18Cr - 8Ni As the kind of steel most widely used, it has the good corrosion resistance, thermal resistance and mechanical properties and is used for home appliances, construction materials and kitchenware, etc. 304L : 18Cr - 9Ni - LC Since it has a low content of carbon compared to that of 304, it has superior inter-granular corrosion resistance and is used for industrial devices, chemical equipments and LNG tanks, etc. 304J1 : 17Cr - 8Ni - 2Cu It has superior formability due to its added Cu content and is used for the materials for deep drawing, such as kitchen sinks and thermos bottles, etc. 316 : 18Cr - 12Ni - 2Mo It has superior corrosion resistance and pitting resistance due to the added Mo and increased Ni content...
Read more

E MAIL WRITING MISTAKES

-
9E-mail writing mistakes that every professional should know Mistake 1: Using the Wrong Tone You might be tempted to send emails quickly when you're in a rush, without thinking carefully about your audience, what you're saying, or how your message might come across. Mistake 2: Hitting "Reply All“ "Reply all" is a useful tool for keeping multiple team members in the loop, or for documenting group decisions, but many people use it without considering who should actually receive their email. Mistake 3: Writing Too Much Brief and succinct emails that contain only the important details are much more effective than long or wordy ones. Mistake 4: Forgetting Something? These mistakes can often be fixed quickly with a follow-up email, but this adds to the large volume of messages that people receive, and it can appear unprofessional or forgetful. Mistake 5: Emailing the Wrong Person This can be embarrassing, but it also means that your emai...
Read more