Mold Steel Comparison: P20 vs H13 vs S136 vs NAK80

Steel comparison:
P20: HRC 28-32, general purpose
H13: HRC 45-52, hot work
S136: HRC 48-52, mirror polish
NAK80: HRC 37-43, pre-hardened

📎 延伸阅读
• 回针（Return Pin）
• 锥形精定位（Taper Lock）
• 顶针（Ejector Pin）注塑模具用