1.2738 vs. P20 Tool Steel: A Detailed Comparison for Mold Makers
Selecting the appropriate tool steel grade for plastic injection molds significantly impacts production efficiency, mold longevity, and part quality consistency. Among pre-hardened mold steels, 1.2738 tool steel and P20 represent two of the most widely specified grades globally, yet subtle compositional and performance differences make each suited to distinct manufacturing requirements and operational priorities. Both 1.2738 tool steel and P20 belong to the chromium-molybdenum low-alloy steel family, typically supplied in pre-hardened condition between 28-32 HRC. This pre-hardened delivery eliminates post-machining heat treatment requirements, reducing lead times and minimizing distortion risks—advantages particularly valuable for complex mold geometries. However, the European designation 1.2738 and American designation P20 exhibit compositional variations that influence machinability, polishability, and long-term dimensional stability. The standard 1.2738 tool steel composi...