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Steel coil, also known as coiled steel, is simply a rolled form of steel; steel is formed into a coil by hot or cold pressing.
It's for easier storage and transportation, and to facilitate various processing steps (such as into steel plates, strips, etc.).
Steel plates hundreds of meters long take up a lot of space, but rolled coils are much smaller and easier and safer to move with a forklift or crane.
Formed coils primarily include hot-rolled coils and cold-rolled coils. Hot-rolled coils are processed before the steel slab recrystallizes. Cold-rolled coils are a subsequent process of hot-rolled coils. Steel coils typically weigh around 15-30 tons.
Using the steel coils from company Fujian Yintu Industrial as an example, let's take a look at their appearance and specifications.
| Steel Type | Grade | C | Si | Mn | P | S |
|---|---|---|---|---|---|---|
| Cold Rolled | DC51D+Z (St01Z, St02Z, St03Z), DC51D+ZF | ≤0.10 | - | ≤0.50 | ≤0.035 | 0.03 |
| DC52D+Z (St04Z), DC52D+ZF | ≤0.08 | - | ≤0.45 | ≤0.030 | 0.03 | |
| DC53D+Z (St05Z), DC53D+ZF | ≤0.08 | - | ≤0.40 | ≤0.030 | 0.03 | |
| DC54D+Z (St06Z), DC54D+ZF | ≤0.01 | ≤0.10 | ≤0.30 | ≤0.025 | 0.03 | |
| DC56D+Z (St07Z), DC56D+ZF | ≤0.01 | ≤0.10 | ≤0.30 | ≤0.025 | 0.03 | |
| Hot Rolled | DD51D+Z (St01ZR, St02ZR) | ≤0.10 | - | ≤0.50 | ≤0.035 | 0.03 |
| DD54D+Z (St06ZR) | ≤0.01 | ≤0.10 | ≤0.30 | ≤0.025 | 0.03 |
Steel coils often weigh several tons, making loading and unloading impossible by hand. Specialized equipment is required to secure the coil cores. Laying the coils flat on the truck, while safer during transport, can be very cumbersome.
Once laid flat, steel coils are difficult to lift, requiring the rental of large lifting equipment. This significantly increases loading and unloading time and costs. Even with large lifting equipment, lifting them is still challenging, as steel coils are typically wired before loading. Laying the coils flat can compress the wires, making them difficult to hook and hook during loading, resulting in both time and effort.
The reason why vertical transport is the primary method for transporting steel coils is to minimize cargo damage. If the steel coil is placed flat, due to the bumpy ride of the truck and the large contact area between the steel coil and the car, it is very easy to cause wear or deformation of the steel coil, seriously affecting the service life of the steel coil or even directly scrapping it. This situation is not only unpopular among manufacturers, but also among truck drivers. Both will suffer serious economic losses, and even the remuneration earned by the driver's friends for one trucking trip is not enough to compensate for the losses.
Nowadays, a small number of truckers equip large trucks with electromagnetic suction cups to secure the coils and place a large amount of wood under the bottom of the coils. This ensures both the integrity of the coils and driving safety. However, only a few trucks have this equipment (after all, transportation costs are high). Therefore, many trucks hauling steel coils still use the traditional method of laying wood under the coils and securing them with corrugated sheeting.
Vertical structure transportation is also for safety reasons. Of course, this method also has certain safety hazards, so preparations must be made before transportation, and relevant tools must be laid out for fixing and anti-slip. At the same time, transportation personnel must pay attention to safe driving, and other vehicles must keep a good distance from the transport truck.
