AISI P20 Pre-Hardened Mold Steel: Plastic Spritzgießen Standard
ASTM A681 (modified) · Published: 2026-06-02 · Updated: July 2026
AISI P20 is a chromium-molybdenum pre-hardened mold steel supplied at 28-32 HRC—ready for machining directly into plastic injection molds without requiring post-machining heat treatment. Nominal composition: 0.28-0.40% C, 1.4-2.0% Cr, 0.3-0.55%...
AISI P20 ist ein chromium-molybdenum pre-hardened mold steel supplied bei 28-32 HRC—ready für machining directly in plastic injection molds ohne requiring post-machining heat treatment. Nominal composition: 0.28-0.40% C, 1.4-2.0% Cr, 0.3-0.55% Mo, und optionally 0.85-1.25% Ni für improved polishability und durch-hardness in large blocks. Der pre-hardened condition eliminates der dimensional changes, distortion, und surface scaling associated mit post-machining heat treatment. P20+Ni (modified mit nickel) ist der standard für large automotive injection molds (bumpers, dashboards) requiring uniform hardness throughout thick sections. Polishable zu SPI EIN-2 finish; texturing durch chemical etching für grain effects.
Quick Facts
| Kategorie | Werkzeugstahl |
| Norm | ASTM A681 (modified) |
| Density | 7.85 g/cm³ |
| Yield Strength | 850 MPa (123 ksi) at 28-32 HRC |
| Tensile Strength | 1,000 MPa (145 ksi) at 28-32 HRC |
Global Equivalents & Cross-Reference
| Alternative Norm / Güte | Action |
|---|---|
| EN 40CrMnNiMo8-6-4 | Compare |
| DIN 1.2738 | Compare |
| NAK80 | Compare |
| 3Cr2Mo | Compare |
| P20+Ni | Compare |
Verwandt Comparisons
Verwandt Materials
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Frequently Asked Questions
Wie tut P20 compare zu H13 für injection molds?
P20 ist pre-hardened und machined directly in der mold—unter kosten, simpler process. H13 ist ein durch-hardening heiß arbeiten steel requiring heat treatment nach rau machining, dann finish machining/grinding. Für plastic injection molds running unter 200°C, P20 ist standard. Für molds running über 250°C (engineering plastics, thermosets) oder requiring exceptional polish (optical lenses), H13 oder stainless mold steels (420, NAK80) sind preferred.
References & International Standards
- ASTM International. Norm Specifications für Stahl & Metal Alloys. astm.org
- International Organization für Standardization (ISO). Metallic Materials — Cross-Referenz Database. iso.org
- American Iron und Stahl Institute (AISI). Stahl Güte Designations & Equivalents. steel.org
- European Committee für Standardization (CEN). EN Stahl Standards & Numbering System. cencenelec.eu