... DIN Certificate: ISO, API,CE The Description of big size carbon steel elbowsizeSeamless:from 1/2" to 24" ... )qualificationISO9001:2008 ,ISO 14001 OHSAS18001 acquired the license for manufacturing special pressure Pipline equipments from AQSIQ , API ... Electronic Market.packingin wooded cases or pallets,or as for clients'requirementsapplicationPetroleum, chemical, machinery, electric power, shipbuilding, ...