1.2738 Mold Steel vs. 1.2316: Key Differences Explained

29 Apr.,2025

 

Understanding the nuances between different grades of mold steel is essential for manufacturers and engineers alike. Among the many options available, 1.2738 and 1.2316 are two prominent choices. While both offer excellent properties for mold production, they serve slightly different purposes based on their inherent characteristics.

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What is 1.2738 Mold Steel?

1.2738 mold steel is also known as P20+S (special) in some regions. It is a versatile, pre-hardened steel that is widely used in the manufacturing of injection molds and dies. This particular grade is known for its excellent machinability and toughness, making it a preferred choice for molds that require high wear resistance and durability.

Key Properties:

  • Hardness: Typically achieves a hardness level of around 28-32 HRC when tempered appropriately.
  • Machinability: Offers superior machinability, allowing for intricate designs and features to be produced with precision.
  • Toughness: Known for its high toughness, which is crucial in applications where molds undergo significant mechanical stress.

What is 1.2316 Mold Steel?

On the other hand, 1.2316 mold steel, commonly referred to as stainless mold steel, is renowned for its corrosion resistance. While it is also used in injection molding applications, its properties make it particularly suitable for molds that will be exposed to harsh environments.

Key Properties:

  • Corrosion Resistance: Exhibits excellent resistance to corrosion, making it ideal for molds working with aggressive materials.
  • Hardness: Typically in a similar hardness range of about 30-34 HRC after appropriate heat treatment.
  • Durability: It retains its mechanical properties even at elevated temperatures, which is beneficial in specific applications.

Key Differences Explained

Understanding the distinctions between 1.2738 and 1.2316 can significantly impact the selection process depending on the application's requirements.

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1. Composition

One of the critical differences lies in their compositions. While both grades are alloy steels, 1.2316 contains higher levels of chromium and nickel compared to 1.2738. This variation contributes to its superior corrosion resistance and makes it a better contender for environments with moisture or chemicals.

2. Application Suitability

1.2738 is often preferable for general-purpose molds where toughness and wear resistance are the priorities. It's an ideal choice for molds operating under moderate conditions. Conversely, 1.2316 shines in applications that demand chemical resistance or when producing parts where surface finish and cleanliness are significant, such as in the food and pharmaceutical industries.

3. Heat Treatment and Hardness

Both grades can be hardened through heat treatment, but their specific heat treatment processes and outcomes can differ. 1.2738 typically achieves optimal hardness when tempered at different temperatures, while 1.2316 may require a more stringent heat treatment regimen to deliver equivalent toughness without compromising corrosion resistance.

Cost Considerations

When comparing these two grades, it is essential to consider cost. Generally, 1.2738 tends to be less expensive than 1.2316. However, the choice should look beyond initial expenditures to consider long-term performance, especially in corrosive environments where using a less expensive steel could lead to higher maintenance costs and production downtime.

Conclusion

Selecting the right mold steel is crucial for the success of any manufacturing project. Both 1.2738 and 1.2316 offer unique advantages that cater to different operational needs. By understanding their core properties, applications, and differences, manufacturers can make an informed choice that optimizes both performance and value.

Final Thoughts

When it comes to mold production, knowledge is power. Whether you require the toughness of 1.2738 or the corrosion resistance of 1.2316, knowing how each grade performs in various conditions will ultimately guide you in the right direction. Choose wisely, and your molds will serve you well for years to come!

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