1.What do "laying horizontally" and "laying vertically" mean in the context of cold-rolled steel coils?
Horizontal (laying flat): The steel coil's axis is parallel to the ground, with its curved surface in contact with the transport vehicle or the ground, like a "lying-down" tire.
Vertical (standing upright): The steel coil's axis is perpendicular to the ground, with its end face (flat surface) in contact with the ground, like a "standing" coin.
2.When transporting cold-rolled coils, is it better to lay them horizontally or vertically?
Safety first, prevent rolling: Vertically placed steel coils have a high center of gravity. When a vehicle brakes suddenly or turns, the lateral impact force generated by inertia can reach tens of tons, making them extremely prone to rolling. If the steel coil breaks through the cab forward or rolls backward, the consequences are unimaginable. There's even a saying in the industry, "Never haul steel coils," highlighting its inherent danger.
Easy loading and unloading, reduced damage: When laid horizontally, lifting equipment can directly pass through the central hole of the steel coil, making loading and unloading highly efficient. Furthermore, even if there is a minor bump at the bottom during transport, only the outermost ring will be damaged. However, if the bottom is damaged when placed vertically, the entire coil may be rendered unusable.
3.How to ensure that steel coils do not roll when transported horizontally?
Padding and Barriers: Lay thick wooden planks or straw mats at the bottom of the steel coil to increase friction, and install triangular wooden blocks or special corrugated boards (saddles) on both sides for physical barrier.
High-Strength Binding: Use steel wire ropes with a diameter of not less than 32 mm to cross-bind the coils, and tighten them with a hand-cranked hoist to ensure the binding tension meets the standard.
Specialized Vehicles: Ideally, a special "coil pulling cart" with V-grooves should be used, rather than a regular flatbed cart.
4.How should cold-rolled coils be stored in a warehouse?
Horizontal storage: Typically stacked in two layers, with larger coils at the bottom and smaller coils on top. The ground must be flat, and the steel coils must not touch the ground directly; thick rubber or nylon straps must be laid underneath. Both ends of the stack must be secured with triangular wooden blocks to prevent rolling.
Vertical storage: Primarily suitable for special products such as electrical steel (silicon steel), and must be secured with vertical wooden supports; the packaging method is more complex. When stacking vertically, it is essential to ensure that the steel coils will not tip over.
5.Since steel coils are transported horizontally, why are they sometimes seen standing vertically in factories?
Because steel coils must be placed vertically during processing.
This is an easily overlooked detail. When cold-rolled steel coils enter the rolling mill, galvanizing line, or leveling line for processing, they need to be hoisted onto an uncoiler. At this time, the coil's centerline must be perpendicular to the ground (vertical placement) for smooth rotation and uncoiling. Therefore, if the steel coil arrives at the factory horizontally, it needs to be flipped from horizontal to vertical using a specialized rewinding machine before entering the production line to meet processing requirements.