Carbon Hot Rolled Steel: What You Need to Know
What It Is:
Carbon hot rolled steel is steel that’s rolled at high temperatures—typically over 1700°F. At this temperature, the steel becomes malleable, allowing it to be shaped easily. The “carbon” part refers to the primary alloying element, which affects strength and hardness.
Key Features:
- Rough Surface Finish: Due to cooling after rolling, it forms a scale on the surface. It’s not as smooth as cold rolled steel.
- Lower Cost: Because it doesn’t require reheating or extra processing, it’s cheaper than cold rolled alternatives.
- Good for Structural Use: Strength, ductility, and formability make it ideal for construction, welding, and industrial fabrication.
- Variable Precision: It’s not as dimensionally accurate as cold rolled steel—tolerances are looser.
Common Grades:
- A36: A widely used low-carbon grade. Easy to weld and machine.
- 1018: Slightly higher carbon content than A36. Better strength and hardness.
- 1045: Medium carbon steel. Stronger and harder, often used in shafts and axles.
Applications:
- Building frames
- Rail tracks
- Agricultural equipment
- Truck frames
- General-purpose fabrication
Pros:
- Lower cost
- Easier to form in large sections
- Readily available in a range of shapes and sizes
Cons:
- Less precise tolerances
- Rough surface may require further processing for aesthetic or tight-fit parts
