T-slot plate are mainly used as fitting workpieces. Which is the fadation plate of adjustng, assembling and reparing equipments. The raw material of the cast iron T-slot  is the -strength cast iron HT200-300 ，whose surface hardness is of HB170-240.After the two manual handing such as 600℃ to 700℃ artificial annealing as well as 2 to 3 years of natural aging, the T-slot has plate perfectly resists abrasion and has stable precision. Precision accuracy:T-slot  plates shall be classified as Grade 0, Grade 1, Grade 2, and Grade 3.