... .5-60mm or as require 2.out diameter: 6-830mm SPECIAL TUBE316L1: 201, TP304, 304L, 316L, TP316L, 316Ti, ... products have got all the Certificates below: A. ISO9001: 2000 b, Any Third Party testing are accepted In order ... and chemistry equipments. All our products are authenticated by ISO9001: 2000. The main materials are 201, 304, 304L, 321 ... water resources and electricity industry etc.1 SPECIAL TUBE316L