00400320250200160125100200―800640500400320250200160125250―1000800640500400320250200160Note:table 2 ◆The hook grade and material Hook gradeMP（S）T（V）Hook No.1.6#-40#Q345qD or 20MnQ345qD or DG20MnQ420qD or 35CrMo35CrMo34Cr2Ni2Mo50#-250#Q420qD35CrMo34Cr2Ni2Mo30Cr2Ni2MoStandard：GB10051-2010 same as DIN15400◆??Mechanical standard Hook GradeCarbon SteelAlloy SteelUpper yield strength MpaImpart energy Akv(ISO-V)/JUpper yield strength MpaImpart energy ?Akv(ISO-V)/J20℃―20℃20℃―20℃Verti