1. The section steel Angle is not full

The causes are: (1) the inherent characteristics of the pass, the corners of the rolled parts can not be processed; (2) The mill adjustment operation is improper, and the distribution of the reduction amount is unreasonable. The amount of corner pressing is small, or the extension of each part of the rolled piece is inconsistent, resulting in excessive shrinkage phenomenon; (3) The pass or guide plate is seriously worn, the guide plate is too wide or the installation is incorrect; (4) Low rolling temperature, poor metal plasticity, and not easy to fill at the corner of the pass; (5) The rolled piece has more serious local bending, and it is easy to produce local Angle filling dissatisfaction after rolling.

2. The shape steel size is out of whack

Causes: (1) unreasonable pass design; Uneven wear of the pass, improper matching of old and new holes; (2) all parts of the mill (including the guide device) are poorly installed, and the safety socket is broken; (3) improper mill adjustment; (4) The billet temperature is uneven, the single root temperature is uneven to produce local specifications, and the whole low-temperature steel produces full-length specifications that are inconsistent and too large.

China H column steel makers--GNEE Group

3. Section steel wave
Defect characteristics: Due to the uneven deformation of rolling, the wave fluctuation in the local section of the steel along the length direction is called the wave. There are local and there are general. The longitudinal wave of the waist of I-beam and channel steel is called waist wave; The longitudinal undulating waves at the edge of I-beams, channels and Angle legs are called leg waves. The I-beams and channel steel with waist waves have uneven longitudinal thickness of the waist, and the phenomenon of metal overlap and tongue cavity occurs when a wave presses a wave in serious cases.
Causes: (1) improper distribution of pressure; (2) roll string movement, rolling groove wrong teeth; (3) the front hole or the front hole rolling groove of the finished product is seriously worn; (4) Uneven rolling temperature.

4. Section steel cutting

Causes: (1) The sawing steel and saw blade (cutting edge) are not vertical or the head of the rolling piece is bent too much; (2) Equipment: saw blade ladle curvature is large, saw blade installation is improper, the upper and lower cutting edge gap is too large; (3) In terms of operation: at the same time, the number of steel roots is too much, the end is too little, and the hot rolled drawing part is not cut.

China H column steel Supplier--GNEE Group

China H section steel makers--GNEE Group