The min tolerance of the casting linear dimensions canbe within 0.1mm,surface roughness is ral.6-12.5 um. Stainiess steel,carbon steel,alloy steel.Standards being used for the materials are GB,ASTM,AISI,JIS,DIN,BS etc. The high precision sodium silicate foundry:It mainly produces commonly prcised casting such as cast steel in different specifications.The products are ranged from 0.5kg to 50kg. ...