The cast iron box table should be made of gray cast iron HT200-300, and its working surface hardness should be 170～240HB.

Cast iron is an alloy consisting of iron and 5 main attendant elements C, Si, Mn, P and S. The element C and Si have got the most important influence on the ultimate tensile strength and Brinell hardness (HBW).

The heat treatment of the cast iron clamping plate is an important process link in mechanical manufacturing. Compared with other processing processes, heat treatment generally does not change the shape of the workpiece and the overall chemical composition.

Rough scraping: If the surface of the clamping plate is rough, processing marks are deep, or the surface is rusty, uneven or twisted, and the scraping allowance is more than 0.005mm, rough scraping should be done first.

The electric surface roughness tester is a stylus type instrument. When measuring, the tip of the stylus of the instrument is on the cross section perpendicular to the direction of the processed texture on the measured surface.

The applicable working environment of various anti-rust paints are different. Therefore, Pay attention to working environment when choosing is necessary.