... other typical casting defects Dense, fine-grained microstructure Thin wall tube Min. 7mm only No pattern or tooling costs ... casting, at same strength, elongation increase 50~100%2.Gray Cast Iron Tube (ASTM A48 class 30,40,50) ---Matrix: ... .1-1.7*105Mpa3. Alloy Gray Cast Iron Tube --CrNiMo Cast Iron --CrMoCu Cast Iron --High Nb Cast Iron--High Ni Cast Iron... 4.Specification: ---Cross-Section:Round, ...