Sheet & plate

HI, Up to what thickness we can say this is sheet and plate ??? and how much its thickness range maximum??

Not sure give a good answer, best ways must refer to the specificied material.
Look at Definitions or Terminology will give your more information.

Example for material specification ASTM A240 - Definitions

  • cold work, n—the changing of mechanical properties by work hardening.
  • plate, n—material 3⁄16 in. [5.00 mm] and over in thickness and over 10 in. [250 mm] in width.
  • sheet, n—material under 3⁄16 in. [5.00 mm] in thickness and 24 in. [600 mm] and over in width.
  • strip, n—cold-rolled material under 3⁄16 in. [5.00 mm] in thickness and under 24 in. [600 mm] in width.
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First time I known.