The 1.2738 tool steel is specifically engineered for the plastic mould industry, exhibiting key properties like superior hardenability and performance, even for intricate mould geometries. The specific properties are primarily hardened with the addition of 1% Nickel into the traditional P20, and it has been found to be a superior choice even for large moulds.
The key benefits of using this specific grade of tool steel include the elimination of heat treatment distortion and superior through-hardenability in the moulds. Also, it can result in enhanced tool longevity and an optimized surface quality. In addition, manufacturers typically prefer this grade because it can result in faster lead times and reduced reworks, therefore proving its value for better cost and time efficiency. By working with a reputed plastic mould steel supplier, you can be confident of the quality of the material, thanks to the excellent workmanship that you can find.
Key Benefits of Selecting 1.2738 Tool Steel
- Ready-to-Machine: Since the steel is supplied in a pre-hardened state, at 28-36 HRC, there are no additional requirements of quenching or tempering.
- Better Post-Machining Dimensional Stability: The steel is supplied at its final working harness. It exhibits better dimensional stability by reducing the risk of cracking.
- Optimum Hardness: The incorporation of Nickel in the alloy formula effectively ensures consistent hardness in the steel, from the surface to the core. The consistency is uniformly showcased even in massive blocks. It can be up to 400 mm in thickness or more.
- Prevention of Soft Spots: The structural homogeneity of the steel makes it an ideal choice for complex mould geometries. It typically features deep cavities and varying wall thickness.
- Etching & Texturing: The uniform geometry of the steel is best for texturing or etching. This property makes it a preferred option for the automotive industry. It's best for dashboards and door panels.
- Mirror Polishability: The fine-grain microstructure and the relative absence of non-metal inclusions (purity) create the perfect substrate choice in situations where a high polishability is required.
- Corrosion Retardant Applications: The steel grade offers better resistance to corrosive flame-retardant additives. It works great for the plastic mould industry.
- Wear & Impact Resistance: The steel composition consists of the Cr-Ni-Mo alloy. It provides a robust balance of hardness and toughness. The mould can withstand high injection pressures without chipping.
- More Efficient Production Schedules: Manufacturers often prefer this steel to reduce production schedules. It does not require heat treatment after the machining stage.
- Reduced Corrective Grinding: The pre-hardened steel exhibits predictable machining behaviour. It minimizes the requirement for expensive corrective grinding.
Other Parameters to Consider
While selecting the right tool steel grade, you should ask for a comparison chart from the supplier. Comparing the various properties side-by-side can help you arrive at an informed choice regarding the feasibility of using 1.2738 tool steel. Also, you can request specific nitriding parameters for the steel, which should be able to increase the surface hardness to 50+HRC, required for high-wear areas.
One of the key challenges is to make sure that the tool steel can withstand the corrosive effect of various resins used in the industry. Make sure that you contact the plastic mould steel supplier and discuss your production process. This enables suppliers like TGKSSL to understand your requirements better and make sure that the tool steel effectively fulfils your requirements.