The raw material of the round plate is the high -strength HT20-40，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
Round plate adopts the coloring method to inspect the machinery parts` geometric tolerance, which is accurate, intuitive and convenient.