Reasons and Solutions for Bending of ASTM A131 AH36 HP bulb flat bar

The yield of domestic ASTM A131 AH36 HP bulb flat bar etc. spherical flat steel products has been maintained at about 83% for a long time. The main factors leading to low yield are: burning loss in furnace, rolling waste, cutting head and tail, and cutting waste loss in the production process. The fundamental reason is that ASTM A131 AH36 HP bulb flat bar etc. spherical flat steel products belong to the flat type of severe asymmetric section steel. The severe asymmetry of section steel gives the rolling pass deformation distribution, pass and guide design, rolling process section. Temperature control and side bending deformation of rolled parts during cooling on cold bed have decisive effects.

When the bending deformation of ASTM A131 AH36 HP bulb flat bar etc. spherical flat steel products on the cold bed reaches a certain degree, it will disturb the normal operation of the cold bed and restrict the normal biting of the subsequent straightening process. Some domestic large-scale flat steel production enterprises are forced to adopt the method of sawing after rolling and multi-stage cooling bed to reduce and control the bending deformation of flat steel. However, the sawing time and rolling loss are increased, which seriously affects the production rhythm and reduces the output and yield.

In order to improve the bending condition of ASTM A131 AH36 HP bulb flat bar etc. spherical flat steel products, most of the water-cooling devices installed on the domestic production line of spherical flat steel are used in the cold bed area at present, but the effect is very little. When the water-cooling device of spherical flat steel is used before and after the rolling mill, the bending condition of ASTM A131 AH36 HP bulb flat bar etc. spherical flat steel products can be changed obviously by means of multi-stage cooling.