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Personne à contacter Mr. zhao
tanggu, zheshangbuilding, Tianjin, Tianjin
welding steel pipes Material and Standard Materials: Q**5 Series, Q**5 Series, No. *0 and so on, for structural, fluid transport and manufacturing purposes longitudinal submerged welded steel pipes; and below X*2 for line and pile steel pipes. Available Standards: GB/T ***8ï&frac*4;***2ã€SY/T ********0ã€GB/T ***2ï&frac*4;***3ã€GB/T ***1.*****7ã€GB/T*********2ã€API 5Lã€ASTM A**6 B and Technical Agreement of two sides.
