... pn10 pn16 4.ISO2531/EN545/EN598 ductile iron pipe fittingsStandards:ISO2531,EN545,EN598,BS4772Material: Ductile Iron (Standard GGG500-7)Coating: ... Tensile strength >420mpaElongation >5%Hardness<250HBProof stress >300mpaDuctile iron pipe fittings type:Flange Series: double flanged 11. ... puddle flanges, all flanged 45 angle branches, all flanged Y pipes, all flanged radial tees, double flanged pipe, ...