Performance Advantages of Cold Rolled and Hot Rolled Steel Plates

1. Higher Precision: Cold rolled strip thickness difference is no more than 0.01-0.03mm.

2. Thinner Dimensions: Cold rolled steel can be as thin as 0.001mm; hot rolled steel can be as thin as 0.78mm.

3. Superior Surface Quality: Cold rolled steel can produce a mirror finish; hot rolled steel often has oxide scales and surface defects.

4. Adjustable Properties: Cold rolled steel can have its tensile strength and process properties like stamping performance tailored to user requirements.

Technical Differences:

- Cold Rolling: Done at room temperature, resulting in hard steel with high strength, making it less prone to deformation.

- Hot Rolling: Done at high temperatures, resulting in lower strength, easier processing, and good ductility. Surface has oxide scales and rough texture.

Mechanical Differences:

- Hot Rolled Plate: Lower strength, poor surface quality, but good ductility and usually used for medium to thick plates.

- Cold Rolled Plate: High strength, hardness, smooth surface, generally used for thin plates suitable for stamping.

Manufacturing Differences:

- Hot Rolling: Typically involves heating steel ingots or billets to 1100-1250°C for rolling.

- Cold Rolling: Involves rolling at room temperature, below the recrystallization temperature of 450-600°C.

Applications:

- Hot Rolled Steel: Good toughness and ductility but inferior mechanical properties compared to cold processed steel.

- Cold Rolled Steel: Lower toughness due to work hardening but better yield strength and precision, used for parts like spring clips.

Understanding these differences is essential for selecting the appropriate type of steel for specific applications, ensuring optimal performance and durability.