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Understanding the Process: Hot-Rolled vs. Cold-Rolled Stainless Steel Coil
Time: 2024-01-04
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In terms of stainless steel coil production, there are two main processes widely used in the industry: hot rolling and cold rolling. Both processes have their own unique advantages and applications, and understanding the differences between the two can help you make an informed decision when choosing the stainless steel coil that’s right for your specific needs.

Hot rolling:

Hot rolling process: refers to the steel ingot or billet that is not easy to deform and process at room temperature. It is generally heated to 1100-1250°C for rolling. This rolling process is called hot rolling.

The hot rolling termination temperature is generally 800-900°C, and is generally air-cooled thereafter, so the hot rolling state is equivalent to normalizing treatment.
Most steel products are rolled using hot rolling methods. Due to the high temperature, a layer of iron oxide is formed on the surface of hot-rolled steel, so it has a certain degree of corrosion resistance and can be stored in the open air. At the same time, the hot rolling process can eliminate the stress inside the material and reduce the risk of material deformation and cracking.

However, this process will cause the surface roughness of the material to increase and the size to fluctuate. Therefore, if the steel has a smooth surface, accurate dimensions, and good mechanical properties, it is necessary to use hot-rolled semi-finished products or finished products as raw materials, and then cold-roll them.

Hot Rolled

Cold rolling:

Cold rolling is a rolling method that changes the shape of the steel by squeezing it under the pressure of rollers at room temperature. It uses hot-rolled steel coils as raw materials, and then undergoes cold continuous rolling after pickling to remove oxide scale. The finished product is hard-rolled coils. Due to the cold work hardening caused by continuous cold deformation, the strength, hardness, and toughness of the hard-rolled coils increase. The index drops, so the stamping performance will deteriorate and it can only be used for parts with simple deformation.

cold rolled

Generally, cold-rolled steel plates, such as galvanized and color steel plates, must be annealed, so they have better plasticity and elongation, and are widely used in automobiles, home appliances, hardware and other industries. The surface of cold-rolled plates has a certain smoothness and smooth feel, mainly due to pickling.

Key Differences between: Hot-Rolled vs. Cold-Rolled Stainless Steel Coil

Product mechanical properties:

  • Hot rolled stainless steel coils have lower dimensional accuracy and lower yield strength.
  • Cold-rolled stainless steel coils have tighter tolerances and higher yield strengths. This makes cold-rolled stainless steel coil more suitable for applications where precision and strength are important factors.

Process and performance:

  • Hot-rolled stainless steel coils are rolled at high temperatures and have good plasticity, but the surface is rough.
  • Cold-rolled stainless steel coils are rolled at room temperature, with smooth surface and high dimensional accuracy, but poor plasticity.

use:

  • Hot-rolled stainless steel coils are mainly used to manufacture heavy structural parts, thick plates and other applications that require higher plasticity and strength.
  • Cold-rolled stainless steel coils are widely used in high-demand fields such as chemical pipelines, electronic devices, building decoration materials, and food and beverage machinery.

Quanshuo Metal Materials is a manufacturer that has passed ISO9001:2015, TUV, SGS, and CE certification. It mainly produces Stainless Steel, etc., with an annual output of 300,000 tons. Looking forward to your inquiry.

+86 13027616811
+86 13027616811
info@qsfullmetal.com
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