My company in 2005 for Sinopec Maoming Petrochemical 1 million tons / year ethylene plant manufacturing company up to the material of 16MnR, specifications for the 15700 * 24 2000m3 mixed carbon four spherical tank 3; the material is 15MnNbR, specifications for up to 15700 x 45 2000m3 LPG tank 2; the material is IE537-2 (-45 C) the /15MnNiNbDR ethylene spherical tank 1, a total of 7 taiwan.