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Standard : GB/T3639, GB/T8713, EN10305-1:2002, EN10305-2:2002, ASTM A519-2006, ASTM A513-2007, GB/T1591-2008, GB/T17396-2009 Material: 20#, 45#, Q345B, Q345D, 25Mn, 27SiMn, E355 Type: Hydraulic ...