H:冷成形用高強度扁平材，flat products of high strength for cold forming
C:冷軋，cold rolled
300:規定的小屈服強度，MPa
LA:低合金鋼，low alloy steels
D:熱鍍代號，for hot dip coating
Z:純鋅鍍層，zinc coating
成分(Wt%)
C碳元素:<=0.11
Si硅元素:<=0.5
Mn錳元素:<=1
P磷元素:<=0.03
s硫元素:<=0.025
Nb鈮元素:<=0.09
Ti鈦元素:<=0.15
Al鋁元素:>=0.015
組合公式1:Nb+Ti+V+B