Q390B Coil Slitting Process, Yield Properties, and Application Areas

Q390B coil is a type of low-alloy high-strength structural steel widely used in construction, machinery manufacturing, shipbuilding, bridges, and other fields. "Q" stands for yield strength, "390" indicates its minimum yield strength of 390 MPa, and "B" denotes that the impact test temperature for this material is 0°C.

Yield Properties

1. Yield Strength: The minimum yield strength of Q390B coil is 390 MPa, indicating the stress level at which the material begins to undergo permanent deformation under tension or compression.

2. Tensile Strength: The tensile strength of Q390B coil typically ranges between 510 and 660 MPa, providing excellent tensile performance.

3. Elongation: The elongation of Q390B coil is generally not less than 21%, demonstrating its good plastic deformation capability.

4. Impact Absorbed Energy: At 0°C, the impact absorbed energy of Q390B coil must be at least 34J, ensuring its toughness in low-temperature environments.

5. Chemical Composition: Q390B coil contains appropriate amounts of alloying elements such as manganese (Mn), silicon (Si), vanadium (V), etc., which help enhance its strength and toughness.

Slitting Process

1. Slitting Line: Slitting involves cutting the coil along its width to form sheets of the desired width.

2. Cutting Precision: The slitting machine must ensure cutting precision to meet the tolerance requirements for sheet width.

3. Cutting Speed: The slitting speed needs to be adjusted based on the material's thickness and strength to ensure cutting quality and production efficiency.

4. Burr Control: Burrs may be generated during the slitting process and need to be removed through subsequent edge trimming or grinding.

5. Coil Flatness: The sheets after slitting must maintain a certain level of flatness to facilitate subsequent processing and use.

6. Surface Protection: During the slitting process, care must be taken to protect the coil surface to avoid scratches and damage.

Application Fields

Due to its high strength and excellent processing performance, Q390B coil is widely used in:

1. Building Structures: Used for load-bearing components of high-rise buildings, bridges, and other large structures.

2. Machinery Manufacturing: Used for manufacturing mechanical structural parts, pressure vessels, storage tanks, etc.

3. Shipbuilding: Used for manufacturing hull structures, decks, and other components.

4. Vehicle Manufacturing: Used for manufacturing automotive frames, body structures, and other components.

5. Petrochemical Industry: Used for manufacturing pipelines, pressure vessels, storage tanks, etc.

6. Power Engineering: Used for manufacturing transmission towers, substation structures, etc.

The yield properties and slitting process of Q390B coil ensure its reliability and applicability in various engineering structures. Through precise chemical composition control and processing techniques, Q390B coil plays a significant role in multiple applications.