Different cooling conditions after rolling of C-shaped steel photovoltaic brackets will result in different microstructures and properties. Controlling cooling can achieve the required performance, such as increasing cooling speed γ → α+ F (cementite) obtains fine grain structure, but for some low thermal conductivity and poor plasticity (alloy steel) that are prone to cold cracking, the commonly used cooling methods for C-shaped steel photovoltaic brackets include the following:

1. Water cooling: spray water or spray cooling on the roller table or cooling bed, and the wire is forced to be cooled through the cooling water pipe. There are requirements for steel, and certain alloys and high alloy steels are prone to stress and cracks. For carbon steel, billets (semi-finished products do not require performance) can be water-cooled. Water cooling can also remove surface oxide scales and improve the production capacity of the cooling bed.

2. Room cooling: The C-shaped steel photovoltaic bracket is placed on a cold bed and cooled by radiation and convection. Any steel grade that is cooled in the air and does not produce thermal stress cracks can be cooled in the room. The cooling speed can be adjusted by blowing and arranging the C-shaped steel photovoltaic bracket densely.

3. Stacking and slow cooling: For certain alloy steels and high alloy steels, stress and cracks are prone to occur, and stacking and slow cooling are necessary.

Stacking cooling: C-shaped steel photovoltaic brackets are stacked and cooled after being cooled to a certain temperature on a cooling bed.

Slow cooling: The C-shaped steel photovoltaic bracket is slowly cooled in a slow cooling pit or subjected to isothermal treatment in an insulation furnace.