2.力学性能：牌号等级屈服点￠，Mpa抗拉强度￠b伸长率纵向冲击功，AKV,J(℃)180℃弯曲试验d=弯≤16>16-35>35-50Mpa200-20-40心直径，a=试样厚度不小于不小于≤16>16Q390A390370350490-650182a3aB390370350490-65018342a3aC390370350490-65019342a3aD390370350490-65019342a3aE390370350490-65019272a3aQ420A420400380520-680172a3aB420400380520-68017342a3aC420400380520-68018342a3aD420400380520-68018342a3aE420400380520-68018272a3aAH60A460440420≥570162a3aB460440420≥57016342a3aC460440420≥57016342a3aD460440420≥57016342a3aQ460C460440420550-72016342a3aD460440420550-72016342a3aE460440420550-72016272a3a