M-Martensite B-Bainitic A-Austemitic C-carbide F-Ferritic Specification NO. steel type chemical ingredient mechanical performance microstructure C Si Mn Cr Mo Ni Cu S P akJ/cm2 HRC abMpa 1 ZG30Cr5MoMnRE 0.25-0.35 0.3-1.0 0.3-1.0 4.5-5.5 0.7-1.0 ≤0.045 ≤0.045 ≥25 ≥45 M+B+C 2 ZG40Cr5MoMnRE 0.35-0.45 0.3-1.0 0.3-1.0 4.5-5.5 0.7-1.0 ≤0.045 ≤0.045 ≥20 ≥48 M+B+C 3 ZG45Cr3NiMoMnRE 0.40-0.50 0.3-08 0.60-1.20 2.0-3.2 0.3-0.5 0.5-1.0 ≤0.04 ≤0.04 ≥20 ≥50 M+C 4 ZG99Cr6MoMo 0.85-0.95 0.4-0.8 0.3-0.8 5-8 0.2-0.4 ≤0.04 ≤0.04 >7 >50 M+C 5 ZGMn13 1.1-1.4 0.3-1.0 11-14 ≤0.06 ≤0.09 >147 HB≤229 637 A+C 6 ZGMn13Cr2 1.1-1.4 0.-1.0 11-14 1.5-2.5 0-0.5 ≤0.06 ≤0.08 >80 ≤240 A+C 7 ZGMn17Cr2 1.1-1.4 0.3-1.0 16-19 1.0-2.0 TI0.2-0.4 ≤0.06 ≤0.08 >50 ≤260 A+C