**1. What is more expensive, hot or cold rolled steel?**
Cold rolled steel is more expensive than hot rolled steel. This is because the cold rolling process involves additional steps after the initial hot rolling. The steel is processed further at room temperature, which requires more energy, time, and specialized equipment. This extra processing results in a product with tighter dimensional tolerances, a smoother surface finish, and increased strength, all of which contribute to the higher cost.
**2. Is 1020 steel hot rolled or cold rolled?**
1020 steel is most commonly supplied in the **hot rolled** condition. You can, however, also purchase it as **cold rolled** (or cold drawn) steel. The "1020" refers to the chemical composition (a carbon steel with 0.20% carbon), while "hot rolled" or "cold rolled" describes the forming process. So, it is available in both forms, but the standard, widely available stock is typically hot rolled.
**3. Is 1008 steel hot rolled or cold rolled?**
Similar to 1020, 1008 steel (a low-carbon steel with 0.08% carbon) is most often found as **hot rolled**. It is also very frequently processed into **cold rolled** sheet and strip because its low carbon content makes it very ductile and excellent for cold-forming operations. So, it is produced in both ways, but it is a very common grade for cold-rolled products.
**4. Are 1018 and 1020 steel the same?**
No, 1018 and 1020 steel are not the same. They are both low-carbon steels, but they have a key difference in their carbon content:
* **1018** has a carbon content range of 0.15-0.20%.
* **1020** has a carbon content range of 0.18-0.23%.
While their carbon ranges overlap slightly, 1020 generally has a slightly higher carbon content. This small difference makes 1018 slightly easier to machine and slightly more ductile, while 1020 can be made slightly stronger through heat treatment. For many applications, they can be used interchangeably, but for precision applications, the specific grade is chosen based on the required properties.
**5. Is 1045 steel hot rolled?**
Yes, 1045 steel (a medium-carbon steel with 0.45% carbon) is very commonly supplied in the **hot rolled** condition. This is the most standard and economical form for this grade, often used for parts that will be machined or heat-treated. It is also available as **cold drawn** bar for better surface finish and dimensional accuracy, but its primary and most common form is hot rolled.
