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Applications of corrosion-resistant molds made of DIN 1.2316 steel

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In the mold manufacturing industry, material selection is an “art of balancing cost and performance.” When dealing with corrosive or filler-containing plastics such as PVC, PC, and POM, ordinary mold steel often struggles to meet the triple requirements of corrosion resistance, high polishability, and long service life—either the surface corrodes into micropores, the polish quickly loses its shine, or the mold fails prematurely.

DIN 1.2316 steel is a high-end mold steel designed to solve these problems. As a martensitic stainless steel with a chromium content as high as 16%, it achieves an excellent balance between corrosion resistance, polishability, and wear resistance.

1.2316 steel turned bar
1.2316 steel turned bar
1.2316 steel milled surface
1.2316 steel milled surface
1.2316 milling service
1.2316 milling service
1.2316 material milled surface
1.2316 material milled surface

1. Properties of DIN 1.2316 steel

The core value of DIN 1.2316 steel lies in its higher chromium content compared to ordinary stainless steel, and the solution to the critical issue of chloride ion corrosion resistance through the addition of molybdenum. Furthermore, DIN 1.2316 produced using the ESR electroslag remelting process boasts a matrix purity far exceeding that of ordinary smelted steel, laying a solid foundation for high-gloss polishing.

For molds that require prolonged exposure to acidic gases or fillers, the primary keyword for DIN 1.2316 steel applications is “corrosion resistance”—it allows the molds to maintain a longer service life in harsh environments.

2. Applications of DIN 1.2316 Material:

PVC and corrosive plastic injection molds (market share 35%)

PVC releases HCl gas during processing, which strongly corrodes the mold cavity. The high chromium + molybdenum combination of 1.2316 effectively resists this acidic corrosion.

  • Typical applications: PVC pipe fittings, wire and cable sheathing molds, window profile extrusion molds
  • Performance: In PVC injection molding environments, 1.2316 molds can last 300,000-500,000 cycles, while 1.2311 molds typically require polishing and maintenance after 30,000-50,000 cycles.
  • Cost savings: The cost of a single mold repair is approximately 15-20% of the original mold value; 1.2316 can reduce unplanned downtime maintenance by 80%.

Precision molds for medical consumables (annual growth rate of 18%)

In the fields of medical and food packaging, the advantages of DIN 1.2316 steel application can be summarized in three words: corrosion resistance, easy cleaning, and dimensional stability.

  • High Corrosion Resistance: Materials commonly used in medical and food packaging, such as PVC, PET, and PP, sometimes contain corrosive additives or require production in high-temperature and high-humidity environments. The 16% chromium + 1% molybdenum combination of DIN 1.2316 steel ensures that molds will not rust or pit during long-term use.
  • High Polishability: Medical consumables (such as infusion tubing connectors and syringes) and food packaging (such as transparent food containers) require extremely high surface finishes. The purity of DIN 1.2316 steel ESR ensures the stability of mirror polishing and is less prone to “orange peel” texture.
  • Pre-hardened Delivery: DIN 1.2316 steel is delivered in a pre-hardened state of 30-35 HRC, allowing for direct machining without heat treatment. This not only shortens mold delivery time by 15%-20% but also avoids the impact of heat treatment deformation on precision dimensions.

Molds for Food Packaging and Cosmetic

Molds for Transparent Optical Product

  • Polishing Performance: Achieves optical-grade #8000 sandpaper effect, haze <0.5%
  • Avoidance of Abrasion and Corrosion: Minor corrosion from the acrylic melt on the mold can be self-healed by a 1.2316 passivation film.

Molds for Containing Glass Fiber Reinforced Plastic (GF 30% or more)

  • Abrasion resistance index: 3.5 times that of relative abrasion resistance 1.2311 (based on wear loss weight)
  • Application example: Automotive intake manifold (PA6+GF35) mold, life increased from 80,000 cycles to 250,000 cycles

If you are troubled by mold corrosion, low polishing yield, or short mold life, or if you would like to understand the performance of DIN 1.2316 steel in your specific working conditions, please contact KeysparkSteel. My team is ready to provide you with detailed technical parameters of DIN 1.2316 steel, sample testing support, and a comprehensive cost analysis report tailored to your specific needs.

Choosing the right material allows your molds to start production on the first try, operate stably, and reduce overall costs by more than 30%.

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