- 4817 E. 355th St Willoughby, OH 44094
- Info@AmericanSpecialtyMetals.com
- 440-951-7600
P-20HH (High Hardness) Mold Steel is a premium-grade tool steel known for its enhanced hardness, toughness, and polishability. It is an upgraded version of the conventional P-20 steel, heat treated to deliver higher strength and wear resistance, making it an excellent choice for demanding plastic injection molds and die-casting tools.
Pre-Hardened for Convenience
P-20HH comes pre-hardened to a Rockwell hardness of around 38–42 HRC, reducing the need for post-machining heat treatment. This saves time and cost while improving machinability.
Exceptional Polishability
With its fine microstructure and cleanliness, P-20HH can be highly polished—ideal for molds that require a glossy surface finish, such as automotive interior components and clear plastic products.
Superior Wear Resistance
Thanks to its higher hardness and uniformity, P-20HH offers excellent wear resistance, extending tool life in high-production environments.
Dimensional Stability
Even after long machining sessions or thermal cycling, this steel maintains dimensional accuracy, making it reliable for precision mold work.
P-20HH is widely used across industries that demand high-performance molds and dies:
Plastic Injection Molds
Used for large-scale production molds, especially for high-clarity or fine-detail products like lenses, electronics casings, or dashboards.
Compression Molding Dies
Applied in thermoset molding processes where dimensional stability and resistance to cracking are essential.
Die Casting Dies
Suitable for non-ferrous die-casting dies where high thermal conductivity and durability are critical.
Automotive & Appliance Components
Used in mold tooling for producing complex plastic or metal parts for automotive dashboards, bezels, and housings.
P-20HH is known for its excellent machinability in the pre-hardened condition. It allows for EDM, CNC milling, and polishing without significant risk of cracking. It can also be nitrided for added surface hardness, improving the performance further in high-wear applications.
Choosing P-20HH mold steel ensures longer tool life, less maintenance, and better end-product quality. Its balance between hardness, machinability, and surface finish makes it one of the most versatile mold steels in the market today.
At American Specialty Metal, we’re more than just a steel supplier—we’re your strategic partner in precision tooling and manufacturing excellence. Here’s why leading manufacturers across the U.S. trust us:
We deliver steel customized to your exact specifications—saving you time, reducing waste, and speeding up your production process. Whether you’re building dies, molds, or fixtures, we precision-cut for your unique needs.
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