... ,90 deg,180 deg, 1.0D, 1.5D, 2.0D, 2.5D, 3D,4D,5D,6D,7D-40D.thicknessSCH10,SCH20,SCH30,STD SCH40, SCH60, XS ... :2008 ,ISO 14001 OHSAS18001packingin wooded cases or pallets,or as for clients'requirementsapplicationPetroleum, chemical, machinery, electric power, shipbuilding, papermaking, construction, etcSpecial ...