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GOST 8734-75 Seamless Structural Steel Pipe and Steel Tubes Cold-Formed 10 , 20 , 35 , 45 , 10Mn2 , 15Cr , 30CrMnSi GOST 8734-75. Seamless Steel Tubes Cold-Formed Outside Diameter: 5 – 140 mm (5; 6; 7...