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10 , 20 , 35 , 45 , 10Mn2 , 15Cr , 20Cr Round Seamless Tube Hot Formed Structural Steel Pipe GOST 8732-78. Seamless Hot-Formed Steel Pipes Outside Diameter: 32 – 219 mm (32; 33,7; 38; 42; 42,4; 45; ...