... .API&ISO certification. API 5L spiral steel pipe/ERW pipe/welded tube.1.API 5L spiral steel pipe1)Standards: SY ... , Elongation),2>Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test etc), ... , Mine Equipment, Electromechanical Hardware, , heavy engineering, Mining and Resources, Process Engineering, Materials Handling,Mechanical Parts 4>Traffic ...