What is a flat bar rail?

1. What’s a flat bar rail?

A flat bar rail is a steel bar, which has a rectangular cross-section profile. There are two types of flat bar rail, square bar rail, and flat steel rail. Their difference lies in their profile. One is square, while the other is a rectangle.

2. Application

Flat bar is widely used in curtain walls, engineering machinery, shipbuilding, elevator parts, overhead crane rails, weight stack, and the automobile industry.

3. Size

The main sizes of flat bar rail include 40x30mm, 40X60mm, 80x60mm, 50x50mm, 100x60mm. The two numbers represent the height and length of the profile of the rails. And the unit of measurement is mm. And the total length of the whole rail is normally 5.8m.

4. Materials and standard

Flat bar rails materials have different standards, like A572, GR 50, ST52-3, S355JR, and Q345B. For example, ASTM A572 steel is a common high strength, low alloy (HSLA) structural steel used in the United States. And Q345B is a kind of GB standard low alloy steel. The main standards are GB, AISI, ASTM, SAE, EN, BS, DIN, and JIS. For instance, JIS represents Japanese standards.

5. How are flat bar rails processed?

Manufacturers can produce flat bar rail in both hot rolled and cold drawn conditions. Hot-rolled steel rails are rolled at high temperatures, while cold-rolled ones are in normal temperatures. Hot-rolled rails are easier to shape, while cold-rolled ones have a smoother surface.

6. How do identify the quality of flat bar rail?

The quality flat bar is straight and has a smooth and intact surface.

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