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GOST 8731 steel pipes We are leading manufacturer and stockist of GOST 8731 steel pipes in China.GOST 8731 steel pipes Chemical CompositionStandard Grade C Mn Si P S Cu Ni Cr Mo V Al N Nb,Ti,B,As and W GOST100,07-0,140,35-0,650,17-0,37=0.035=0.040.15GOST200,17-0,240,35-0,650,17-0,37=0.035=0.040.25GOST350,32-0,400,50-0,800,17-0,37=0.035=0.040.25GOST450,42-0,500,50-0,800,17-0,37=0.035=0.040.25GOST20X0,17-0,230,50-0,800,17-0,37=0.035=0.0350.70-1.00GOST 8731 steel pipes Mechanical PropertiesStandardGradeHeat Treatment Pour Point Re min. (Mpa)Tensile Strength Rm (MPa) Elongation            A5 min.