... Density,Zero Defects,superb wear resistance 2.Wear Ring/SG Wear Ring This is Shaanxi Tongxin Continuous Cast Tube Tech ... mm2 ---compare sand casting, at same strength, elongation increase 50~100%2.Gray Cast Iron Tube (ASTM A48 class ... 30,40,50) ---Matrix: ferrite+pearlite ---σb=150-350 Mpa, HB ... ,Hexagonal ---OD:60-320mm,Thickness:7-38mm Wear Ring For Hydraulic