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Petroleum pipelines, natural gas pipelines ,coal gas ,coal slurry distribution ; auto transmission , steel construction ,chemical industry, electric industry, piles and other fields . wall thickness:5-30mm(0.21"-1.20")
outer diameter: 219-3200mm(8.76"-128")
length: according to customer's requirements
3.standard:
BS EN10296, BS EN10219, API 5CT, API 5L
