Cast iron platform Precision: According to the national standard verification procedures, namely 0,1,2,3 grade four level surface quality flatbed / platforms: Size: 200mm × 200mm-2000mm × 4000mm (special specifications according to the demand side drawing production or agreed upon production and processing) test: test method with coloring 0 a flat platform of not less than 25 points level 2 flat platform on each side of 25 mm on each side of the square is in the range of 25 mm square. within the range of not less than level 3 20:00 flat iron platform platform uses less than 12 points in each side of 25 mm square range: Suitable for a variety of inspection, precision measurement of the reference plane for measuring machine tools the dimensional accuracy of the reference check form part of or deviation, and make precision crossed in machinery manufacturing is also indispensable basic tool for cast iron materials and processing platform Material: high-strength cast iron material HT200-250 face hardness HB160- 210. After two treatments (artificial annealing 600? ---- 700? and natural aging --- three years, so that the product accuracy and stability, good wear resistance.