Assessing the Formability and Bending Properties of CR4 Steel Grade

Assessing the Formability and Bending Properties of CR4 Steel Grade

Content:

In manufacturing and fabrication, selecting the right steel grade is crucial for achieving optimal results in forming and bending operations. CR4 steel grade, a cold-rolled low-carbon steel, stands out for its excellent formability, making it a preferred choice for applications requiring complex shapes and precise bends.

Understanding CR4 Steel Grade

CR4 is a commercial-quality cold-rolled steel defined under standards such as BS EN 10139. Its chemical composition, characterized by low carbon content, is the foundation of its good ductility and formability. This grade is specifically designed to be easily worked without compromising its structural integrity.

Key Formability and Bending Properties

The formability of CR4 steel is one of its most significant advantages. It can be bent, stamped, drawn, and roll-formed without cracking or failing. This is quantified by its mechanical properties:

Yield Strength: Typically ranging from 280 MPa, providing a good balance between softness for forming and strength for the final product.

Elongation: Offers a minimum elongation of 20-22% (on a 80mm gauge length), indicating its ability to stretch and deform significantly before fracture. This high elongation is a direct measure of its superior formability.

For bending, CR4 performs reliably. The minimum internal bend radius is generally recommended to be equal to the sheet thickness (a 1:1 ratio) for bends across the rolling direction. This allows for the creation of tight, sharp bends, which is essential for manufacturing cabinets, brackets, and various structural components.

Advantages in Practical Applications

The excellent formability of CR4 translates into several benefits:

Reduced Springback: Its composition minimizes springback after bending, ensuring the final product maintains the intended shape.

Good Surface Finish: The cold-rolled process provides a smooth, clean surface ideal for painting or powder coating.

Cost-Effectiveness: By reducing the risk of cracking during production, CR4 steel lowers scrap rates and improves manufacturing efficiency.

CR4 steel grade is widely used in automotive components, household appliances, furniture, and general engineering projects.

At Ruixiang Steel, we supply high-quality CR4 steel sheets and coils that guarantee consistent formability and bending performance. Our expertise ensures you receive the right material for your fabrication needs, enabling you to create durable and precise products with ease.