DC51D+Z, DC51D+ZM, DC51D+ZM2, DC51D+ZF, DD51D+Z 低碳钢 DC52D+Z, DC52D+ZM, DC52D+ZM2, DC52D+ZF 低碳钢或无间隙原子钢 DC53D+Z, DC53D+ZM, DC53D+ZM2, DC53D+ZF DC54D+Z, DC54D+ZM, DC54D+ZM2, DC54D+ZF DC56D+Z, DC56D+ZM, DC56D+ZM2, DC56D+ZF 无间隙原子钢 DC57D+Z, DC57D+ZM, DC57D+ZM2, DC57D+ZF S220GD+Z, S220GD+ZM, S220GD+ZM2, S220GD+ZF S250GD+Z, S250GD+ZM, S250GD+ZM2, S250GD+ZF 碳素结构钢或低合金钢 S280GD+Z, S280GD+ZM, S280GD+ZM2, S280GD+ZF Q/BQB 420—2021 4 表1（续） 牌 号 a 钢种特点 S320GD+Z, S320GD+ZM, S320GD+ZM2, S320GD+ZF S350GD+Z, S350GD+ZM, S350GD+ZM2, S350GD+ZF 碳素结构钢或低合金钢 S550GD+Z, S550GD+ZM, S550GD+ZM2 HC180YD+Z, HC180YD+ZM, HC180YD+ZF 高强度无间隙原子钢或碳锰钢 HC220YD+Z, HC220YD+ZM, HC220YD+ZF B240P1D+Z, B240P1D+ZM, B240P1D+ZF B260LYD+Z, B260LYD+ZM, B260LYD+ZF HC260YD+Z, HC260YD+ZM, HC260YD+ZF HC180BD+Z, HC180BD+ZM, HC180BD+ZF 烘烤硬化钢 HC220BD+Z, HC220BD+ZM, HC220BD+ZF HC260BD+Z, HC260BD+ZM, HC260BD+ZF HC300BD+Z, HC300BD+ZM, HC300BD+ZF HC260LAD+Z, HC260LAD+ZM, HC260LAD+ZF 低合金高强度钢 HC300LAD+Z, HC300LAD+ZM, HC300LAD+ZF HC340LAD+Z, HC340LAD+ZM, HC340LAD+ZF, HD340LAD+Z HC380LAD+Z, HC380LAD+ZM, HC380LAD+ZF HC420LAD+Z, HC420LAD+ZM, HC420LAD+ZF, HD410LAD+Z HC460LAD+Z, HC460LAD+ZM, HC460LAD+ZF HC500LAD+Z, HC500LAD+ZM, HC500LAD+ZF、HC550LAD+Z HD500LAD+Z，HD550LAD+Z HC250/450DPD+Z, HC250/450DPD+ZM, HC250/450DPD+ZF 双相钢 HC300/500DPD+Z, HC300/500DPD+ZM, HC300/500DPD+ZF HC340/590DPD+Z,