Unlocking Precision: The Essential Plastic Mold Steel Hardness Chart for Seamless Production

Author: Ingrid

Aug. 27, 2025

In the world of plastic injection molding, achieving high precision is essential. Many manufacturers grapple with the challenge of selecting the right mold steel hardness, which directly impacts the durability and quality of the final product.

The company is the world’s best Plastic mold steel hardness chart supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

Understanding the Plastic Mold Steel Hardness Chart

The plastic mold steel hardness chart is a valuable resource that provides essential information on the hardness levels of various mold steels. It serves as a guide for manufacturers in selecting the right material for their specific applications, ensuring both efficiency and quality in production.

The Importance of Hardness in Mold Steel

The hardness of mold steel significantly affects wear resistance, machinability, and overall mold life. According to a study by the American Society for Testing and Materials (ASTM), the right hardness can reduce maintenance costs by up to 20% and extend the mold's lifespan.

Key Hardness Measurements

  • Rockwell Hardness: A widely used method measured in HRB or HRC.
  • Brinell Hardness: Measures the surface hardness; useful for calculating toughness.
  • Vickers Hardness: Utilizes a diamond indenter for precise measurements across different materials.

Comparative Hardness Chart

Mold Steel Type Hardness (HRC) Applications
P20 28-32 General purpose molds
S136 48-52 High-precision molds
H13 45-50 Hot runner molds

Real-World Application Case Study

A leading automotive parts manufacturer was facing frequent mold failures due to incorrect hardness selection. By utilizing the plastic mold steel hardness chart, the company switched to S136 which enhanced mold longevity and reduced production delays by 30%. The initial investment in higher-quality steel resulted in substantial long-term savings.

FAQs About Plastic Mold Steel Hardness

What factors should I consider when selecting mold steel?

Consider the type of part, the expected production volume, and the required precision. Always refer to the hardness chart for guidance.

Contact us to discuss your requirements of plastic mold steel. Our experienced sales team can help you identify the options that best suit your needs.

Further reading:
Choosing Reliable Plastic Mold Steel for Durability

How does hardness affect production time?


Mastering Complex Mold Steel: Key Solutions for Durability
Polished Mold Steel Grades: Which One Is Right for You?

Proper hardness can streamline machining processes and reduce cycle times. Molds with appropriate hardness require fewer adjustments and repairs.

Can I use the same hardness for different molds?

No, different molds have different requirements. Always refer to the chart to match the steel hardness to the specific application.

How do I test mold steel hardness?

Testing methods include Rockwell, Brinell, and Vickers tests. Each method provides different insights into the material's properties.

Where can I find a reliable plastic mold steel hardness chart?

Reputable industry organizations and materials suppliers often provide detailed charts, ensuring accurate and updated information.

Utilizing a plastic mold steel hardness chart is vital for optimizing production efficiencies and enhancing product quality. By understanding the importance of mold steel hardness, businesses can make informed decisions that pave the way for seamless operations.

For more information, please visit 718h steel.

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