A.12~33% B.12~43% C.2~23% D.2~33%
A.雙金屬腐蝕 B.氫致開裂 C.硫化氫點蝕 D.金屬腐蝕穿孔
A.0.1~0.5% B.0.5~0.8% C.0.8~1.2% D.1.2~1.5%