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D 21,3 mm, thickness 2 mm D 27 mm thickness 2 mm D 32 mm thickness 3 mm D 42 mm thickness 3 mm D 57 mm thickness 3 mm D 89 mm thickness 3,5 mm D 102 mm, thickness 3,5 mm D 127 mm thickness 4 mm D 159 mm thickness 4 mm X52 grade steel, According to Api 5L pSL1 PN 6 atmosphere , or Russian standard ГОСТ 3262, ГОСТ 10705-80, ГОСТ 10704-91

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