... - 1,200 mm 8) High strength, lighter than gray iron, good corrosion resistance, no furring, small flow resistance, easy fixing, long life ... % b) Si: 2.0 - 2.4% c) P: <0.08% d) S: <0.015 11) Pull strength: >420MPa 12) Yield: >10 ... treatment (Micro & chemical composition test) c) Pipe spinning (Temperature test) d) Heat treatment (Micro structure; Flattening test) e) Zinc coating (Thickness ...