... which made of carbon & alloy steel, stainless steel. The pressure vessels, columns, reactors, towers, heat exchangers, condensers, storage ... .Grade III of Designing and Manufacturing License of Pressure Vessel P.R. of China; 2.Manufacturing License ... by different material such as special material (Monel, Inconel, Incoloy, Hastelloy, etc.), stainless steel ( duplex stainless, UNS31803, SAF2205, SAF2507, ...