How to express the channel steel symbol?

The specifications of channel steel are mainly expressed by height (H), leg width (B) and waist thickness (D). The specifications of domestic channel steel range from No.5 to No.40, that is, the corresponding height is 5 -40 cm. At the same height, light channel steel has narrower legs, thinner waist and lighter weight than ordinary channel steel. 18 -40

The number is big channel steel, 5-16.

No, the channel steel is a medium channel steel.

Imported channel steel shall be marked with actual specifications and relevant standards. The import and export sequence of channel steel is generally based on the specifications required in use after determining the corresponding carbon steel (or low alloy steel) steel grade. Except the specification number, channel steel has no specific composition and performance series.

The delivery length of channel steel is divided into fixed length and double length, and the tolerance value is specified in the corresponding standard. The length selection range of domestic channel steel can be divided into three types according to different specifications: 5-12m, 5-19m and 6-19m. The length selection range of imported channel steel is generally 6-15m.

Extended data:

Improvement measures for channel steel:

1. In order to solve the problem of slow cooling speed of the cooling bed, a water mist fan was added in the cooling bed area to improve the cooling speed of the cooling bed area, and a group of double-scale water mist nozzles were added in front of the shearing machine to reduce the temperature of the shearing part of the cooling bed. Channel steel, thus avoiding the shear defect caused by high temperature of steel.

2. In view of the problems existing in the design of channel steel cutting edge, combined with the actual production situation, the design of cutting edge is shown in Figure 2 (taking 100 channel steel as an example). The width of the upper knife edge is changed from 100 mm to 99 mm, which reduces the gap in the left and right direction of the upper knife edge and improves the shearing quality of the two corners of the channel steel.

3. Through the regression analysis of the actual shear quality and shear gap of various specifications of channel steel, the shear gap specifications of various specifications of channel steel are formulated, which are: 0.20-0.30 mm for 63 channel steel, 0.20-0.35 mm for 80 channel steel and 0.25-0.35 mm for 100# channel steel.

Baidu encyclopedia-channel steel