P20 Plastic Mold Steel is a high-quality steel widely used in the field of mold manufacturing.
1. Excellent Machinability
Cutting Performance: P20 steel exhibits low cutting resistance, enabling high machining efficiency with minimal tool wear, making it suitable for high-speed machining. Its surface finish quality is exceptional, achieving mirror-like polishing (surface roughness Ra ≤ 0.05 μm) to meet stringent requirements for high-end plastic products.
Electrical Discharge Machining (EDM) Performance: During EDM, P20 steel ensures uniform surface quality with moderate electrode wear, meeting precision machining needs.
Forgability: In its annealed state, P20 steel demonstrates good forgeability, allowing it to be shaped into desired mold forms through forging processes, further controlling costs.
2. Favorable Mechanical Properties and Stability
Mechanical Properties:
Tensile Strength: 1000–1200 MPa
Yield Strength: 800–1000 MPa
Elongation: 12–18%
Impact Toughness: 50–70 J/cm²
These metrics indicate that P20 steel retains sufficient strength and toughness in its pre-hardened state to withstand complex stresses during mold operation.
Dimensional Stability: P20 steel exhibits minimal heat treatment distortion and low dimensional variation, making it ideal for manufacturing high-precision molds. Its dimensional stability can be further enhanced through cryogenic treatment (-70 to -80°C) and stabilization tempering (150–160°C).
3. Corrosion Resistance and Wear Resistance
Corrosion Resistance: P20 steel contains alloying elements such as chromium (Cr) and molybdenum (Mo), providing excellent resistance to corrosion in humid or corrosive environments, thereby extending mold service life.
Wear Resistance: Through surface hardening treatments like carburizing, nitriding, or nitrocarburizing, the surface hardness of P20 steel can be significantly increased (e.g., nitrided surfaces reach HV 800–1000), further enhancing wear resistance for high-volume mold applications.
