24 July 2021 Hardware Tool Steel Sheet
P20 Hardware Tool Steel Sheet
P20, is from 4130 , 4135 modified material, has long history been the steel of choice for pre-hardened mold steels. P20 is classified as a chrome-moly alloy, with a carbon content of approximately 0.30 to 0.40. Over time, many variations on basic P20 chemistry have been introduced to the marketplace. Each modification can have an effect on the various processes used in the fabrication of a mould.
The moldmaking industry in the U.S. is Eurocentric in nature. European immigrants came to the U.S. with trade backgrounds and had a large influence on the mold building industry. They naturally gravitated to building molds with the chrome-moly steels they were used to, such as DIN 1.2311 and DIN 1.2312, or their close cousin, AISI P20.
P20 differs from region to region in the worldwide market. Europeans generally use the DIN spec materials (1.2311 and 1.2312), while in Japan, PX5 is the new standard P20. The Chinese market is less clear, because the lack of information about the materials being used for their molds makes it difficult for secondary polishing and texturing processors to know what they are dealing with.
Chemical Composition:
| Grade | C | Si | Mn | P | S | Cr | Mo |
| P20 | 0.28-0.40 | 0.20-0.80 | 0.60-1.00 | ≤ 0.030 | ≤ 0.030 | 1.40-2.00 | 0.30-0.55 |
Machanical Properties:
| Testing temperature | 20°C | 200°C |
| Tensile strength Rm,N/mm2 | 1020 | 930 |
| Yield strength Rp 0.2,N/mm2 | 900 | 800 |
| Compressive yield strength Rc 0.2,N/mm2 | 850-1000 | |
| Elongation ,% | 20 | — |
| Charpy-v impact,J | 27 | — |