Table of content
Introduction
Cold rolled steel is a type of steel, and its counterpart is hot rolled steel. Cold rolled steel is mostly used in the pipeline industry or in automobiles and kitchenware. This article will give a detailed introduction to the production process, performance, and uses of cold rolled steel. I hope this article can be helpful to those who are new to the industrial steel industry.
What is CR Steel?
CR steel stands for cold rolled steel. Cold rolled steel is a production process for steel, which is mainly processed at room temperature. The steel surface of this process is smoother, and the strength and precision are relatively high. Compared with hot rolled steel, the surface is smoother and more beautiful.
What Does CR Mean in Steel?
CR stands for cold rolling. It is rolled at or near room temperature. The opposite is hot rolling (HR), which is rolled at high temperature (about 1700°F or 926°C).
Why does that matter?
Cold rolling:
- It can increase hardening and strength through stress.
- It can make the surface smoother and glossier.
- There are more precise tolerances.
Therefore, cold rolled steel is mostly used in some products that require a clean surface.
How is CR Steel Made?
The production process of cold rolled steel is to first cool the hot rolled steel to room temperature. Then it is compressed and shaped by a series of rollers. This process does not require reheating and is rolled at room temperature. Its hardness, strength and surface smoothness will also be improved.
Steps in the CR steel production:
1. First, the initial shape is made by hot rolling.
2. Pickling is performed to remove scale and oxide.
3. Rolling is performed to shape after cooling.
4. Annealing is performed if softening is required.
5. Tempering or smoothing is required for a smoother surface.
Which is Better: HR or CR Steel?
Both have advantages and disadvantages. Which one is better depends on your specific use.
| Feature | Hot Rolled Steel (HR) | Cold Rolled Steel (CR) |
|---|---|---|
| Processing Temp | High | Room Temperature |
| Surface Finish | Rough and scaled | Smooth and shiny |
| Dimensional Accuracy | Loose tolerances | Tight tolerances |
| Strength | Moderate | Higher (due to strain hardening) |
| Cost | Lower | Higher |
| Applications | Construction, welding | Automotive, appliances, precision parts |
For some construction projects or places where precision is not required, hot rolled steel can be selected.
For some products that require high precision and exquisite appearance, cold rolled steel is preferred.
What is CR Steel Used For?
Due to the high strength and beautiful surface of cold rolled steel, it is widely used.
Common Applications:
- Automotive industry: car doors, car bodies, etc.
- Home appliance industry: refrigerators, washing machines.
- Furniture: table brackets.
- Machinery parts
- Steel pipes and fittings
What is the Difference Between CR Steel and MS Steel?
Cold rolled steel refers to the production process, while carbon steel refers to the material. Both are different.
| Feature | CR Steel | MS Steel |
|---|---|---|
| Definition | Cold rolled, finished steel | Mild carbon steel, hot rolled |
| Strength | Higher | Moderate |
| Surface Finish | Smooth and shiny | Rough and scaled |
| Formability | Good (but less than MS) | Excellent |
| Cost | Higher | Lower |
| Use Case | Precision parts, appliances | Construction, welding |
Cold rolled steel can be low carbon steel, but not all low carbon steel is produced by cold rolling.
What is CR Steel Made Of?
Cold rolled steel is usually made of carbon steel, including but not limited to low carbon steel, medium carbon steel, and high carbon steel. There are also some other alloys, that is, steel with added elements such as iron, carbon, manganese, and silicon. The cold rolling process can improve the strength and ductility of steel.
Common CR Steel Grades:
- CR1 to CR4： Vary in strength and surface finish
- DC01 (DIN): General cold-rolled grade for stamping
- SPCC (JIS G3141): Japanese standard for cold rolled carbon steel
Cold Rolled Steel vs Stainless Steel
Cold rolled steel is not the same as stainless steel. Here are some differences in performance:
| Feature | CR Steel | Stainless Steel |
|---|---|---|
| Corrosion Resistance | Low (needs coating) | High (due to chromium) |
| Appearance | Smooth, gray | Shiny, silver |
| Price | Lower | Higher |
| Weldability | Good | Good |
| Best For | Automotive, furniture | Medical tools, kitchens, marine use |
Stainless steel is more corrosion resistant and is often used in some acidic environments. Cold rolled steel can be selected if you need something that is easy to form and more affordable.
What is the Price of CR Steel?
Cold rolled steel has more production processes than hot rolled steel, so the price is relatively high. The higher the price, the higher the performance, such as higher surface smoothness, higher precision, higher strength and durability.
Estimated Price Range:
CR steel coil: $800–$1100 per ton
CR sheet/plate: $1.20–$2.00 per lb (depending on thickness & grade)
Please contact the supplier for specific prices, as prices vary depending on the market industry.
Summary
This article mainly introduces cold-rolled steel. Cold-rolled steel is a kind of carbon steel with high precision, high strength and high durability. Its production process is to cool the hot-rolled steel to room temperature and then roll it through a rolling machine. The steel plate produced by this process of cold rolling has high strength, high precision and a flat and smooth surface.
These properties make it widely used. The CR in cold-rolled steel stands for cold rolling, which is a process.
I hope that reading this article will help you understand cold-rolled steel and make the right choice when choosing.
