1. High carbon steel has poor hardenability
After water quenching, the critical quenching diameter of carbon steel is 15~20mm. For parts with a diameter greater than 20mm, it is impossible to quench even with water quenching, and it cannot be guaranteed that the entire cross section will obtain consistent comprehensive mechanical properties. Therefore, for large parts with high requirements, carbon steel is definitely not suitable. Alloy steel has high hardenability and can be used to manufacture parts with large cross-sections and complex shapes.

2. High carbon steel has low high temperature strength and poor red hardness
When carbon steel is used at temperatures above 200℃, its strength and hardness will decrease rapidly. Alloy steel has good stability after tempering. Good red hardness and can work at higher temperatures.

3. High carbon steel cannot obtain good comprehensive performance
For example, when using quenching and tempering treatment to try to obtain good comprehensive performance, if you want to ensure higher strength, the toughness is low, and if you want to ensure better toughness, the strength is low. This is due to the poor tempering stability of carbon steel. Therefore, the comprehensive performance obtained by carbon steel is far worse than that of alloy steel; that is, alloy steel has very good strength and toughness.

4. High carbon steel does not have special properties
For example, high temperature hardness or tensile strength, oxidation resistance, corrosion resistance, special electrical and magnetic properties, etc., cannot be obtained with carbon steel, and only alloy steel can be used to meet the above requirements. Carbon steel also has some advantages. For example, by changing its carbon content and performing appropriate heat treatment, many properties required in industrial production can be obtained. Because carbon steel is low in price, easy to produce, and has good processing performance, it is still a very widely used steel material in industry, accounting for more than 80% of the total steel consumption.

The thickness of the color steel tile is generally expressed in millimeters (mm). Common thickness specifications are 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.2mm, 1.5mm, etc. Different thicknesses are suitable for different application scenarios. In the construction and industrial fields, the commonly used color steel tile thickness specifications are mainly 0.3mm, 0.4mm, 0.5mm and 0.6mm. The width is about 860mm, the coverage area is large, and it is mainly suitable for industrial and civil buildings, warehouses, special buildings, and roofs of large-span steel structure houses.

Horizontal packaging:
Basic packaging structure: This is a more conventional packaging method. Iron sheet is usually used as the outer packaging material to tightly wrap the prepainted steel coil, which can protect the prepainted steel coil from scratches and other damage during transportation and storage. The inside of the iron sheet package will be lined with moisture-proof paper to prevent the prepainted steel coil from getting damp. The inner diameter of the prepainted steel coil under this packaging method is generally 508 mm or 610 mm, which is suitable for most conventional transportation and storage scenarios.
Special reinforcement measures: Some customers will add iron sleeves inside the prepainted steel coil according to actual needs. This iron sleeve can play a supporting role and prevent the prepainted steel coil from collapsing during transportation or long-term storage. However, adding an iron sleeve is a special requirement and may incur additional costs.

Vertical packaging:
Packing form characteristics: Vertical packaging is a packaging method that has gradually emerged in recent years. When the prepainted steel coil is vertically packaged, the core of the coil is upward, and the bottom is fixed on a wooden pallet. This packaging method can make the prepainted steel coils more stable during transportation and can effectively prevent the prepainted steel coils from being deformed and scratched due to shaking or squeezing, even in long-distance transportation or complex transportation environments.

Standard export packaging:
Packaging materials and reinforcement methods: If the prepainted steel coils are used for export, standard export packaging will be used. The outer surface of this packaging method is usually waterproof kraft paper and galvanized iron. The outer surface of the prepainted steel coils is usually waterproof kraft paper and galvanized iron. It is also protected again with galvanized iron sheets, and the entire packaging is reinforced with steel wire.

1. Horizontal packaging
Horizontal packaging is the default factory packaging method for prepainted steel coil manufacturers, with iron sheet wrapped outside and moisture-proof paper lined inside, and the inner diameter of the roll is 508/610mm; some customers also have special requirements, adding iron sleeves inside to prevent roll collapse, and adding iron sleeves requires additional charges, and the prices vary slightly from manufacturer to manufacturer.

2. Vertical packaging
Vertical packaging appeared later than horizontal packaging. Its advantages are that it is more secure during transportation and it can avoid roll collapse without iron sleeves, ensuring that the prepainted steel coil is delivered to customers safely and without scratches. Of course, there are additional costs because vertical packaging is more troublesome than horizontal packaging when loading and unloading vehicles.
As customers' requirements for product quality increase, more and more people choose vertical delivery.