牌号拉伸试验a,b,c屈服强度抗拉强度断后伸长率MPaMPaA80mm

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不小于HC260LAD+Z(H260LAD+Z)260～330350～43026HC260LAD+ZF(H260LAD+ZF)24HC300LAD+Z(H300LAD+Z)300～380380～48023HC300LAD+ZF(H300LAD+ZF)21HC340LAD+Z(H340LAD+Z)340～420410～51021HC340LAD+ZF(H340LAD+ZF)19HD340LAD+Z(HR340LAD+Z)≥340≥41018HC380LAD+Z(H380LAD+Z)380～480440～56019HC380LAD+ZF17HC420LAD+Z(H420LAD+Z)420～520470～59017HC420LAD+ZF15HD410LAD+Z(HR410LAD+Z)≥410≥48015