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4 分类和代号
4.1 钢板及钢带按用途区分应符合表1的规定。
4.2 钢板及钢带按表面质量区分应符合表2的规定。
表1
牌 号
a 钢种特点
DC51D+Z, DC51D+ZM, DC51D+ZF, DD51D+Z 低碳钢
DC52D+Z, DC52D+ZM, DC52D+ZF 低碳钢或无间隙原子钢
DC53D+Z, DC53D+ZM, DC53D+ZF
DC54D+Z, DC54D+ZM, DC54D+ZF
DC56D+Z, DC56D+ZM, DC56D+ZF 无间隙原子钢
DC57D+Z, DC57D+ZM, DC57D+ZF
S220GD+Z, S220GD+ZM, S220GD+ZF
碳素结构钢或低合金钢
S250GD+Z, S250GD+ZM, S250GD+ZF
S280GD+Z, S280GD+ZM, S280GD+ZF
S320GD+Z, S320GD+ZM, S320GD+ZF
S350GD+Z, S350GD+ZM, S350GD+ZF
S550GD+Z, S550GD+ZM
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
Q/BQB 420—2018
4
表1（续）
牌 号
a 钢种特点
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
HD550LAD+Z
HC250/450DPD+Z, HC250/450DPD+ZM, HC250/450DPD+ZF
双相钢
HC300/500DPD+Z, HC300/500DPD+ZM, HC300/500DPD+ZF
HC280/590DPD+Z, HC280/590DPD+ZM, HC280/590DPD+ZF
HC340/590DPD+Z, HC340/590DPD+ZM, HC340/590DPD+ZF
B340/590DPD+Z, B340/590DPD+ZM, B340/590DPD+ZF
HC420/780DPD+Z, HC420/780DPD+ZF
HC500/780DPD+Z, HC500/780DPD+ZF
HC550/980DPD+Z, HC550/980DPD+ZF
HC650/980DPD+Z, HC650/980DPD+ZF
HC700/980DPD+Z, HC700/980DPD+ZF
HC740/1180DPD+Z, HC740/1180DPD+ZF
HC820/1180DPD+Z, HC820/1180DPD+ZF
HC380/590TRD+Z, HC380/590TRD+ZF
HC400/690TRD+Z, HC400/690TRD+ZF 相变诱导塑性钢
HC420/780TRD+Z, HC420/780TRD+ZF
HC570/780CPD+Z
HC780/980CPD+Z 复相钢
HD660/760CPD+Z
HC600/980QPD+Z
淬火延性钢 HC600/980QP-ELD+Z
HC820/1180QPD+Z
HC820/1180QP-ELD+Z
aDD51D+Z、HD340LAD+Z、HD410LAD+Z、HD550LAD+Z、HD660/760CPD+Z为热轧酸洗基板，其余均为冷轧基板。 表2
级别 代号
较的精整表面(Normal) FB
的精整表面(Improved) FC
超的精整表面(Best) FD
耐指纹产品表面 FN
4.3 钢板及钢带按镀层种类、镀层重量表示方法、表面结构、表面处理区分应符合表3规定。
表 E.2 Q/BQB 420-2018 EN 10346:2015 JIS G 3302:2012 ASTM A653M-15S220GD+Z,S220GD+ZF S220GD － SS 230 S250GD+Z,S250GD+ZF S250GD SGC340SS 255 S280GD+Z,S280GD+ZF S280GD SGC400 SS 275 S320GD+Z,S320GD+ZFS320GD － － S350GD+Z,S350GD+ZF S350GD SGC440 SS 340 class 4 S550GD+ZS550GD SGC570 SS 550 class 2
