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DIN 1.2085 Steel: Strength, Hardness & Corrosion Resistance

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1. What is DIN 1.2085 Steel?

DIN 1.2085 steel is a martensitic stainless mold steel under the German DIN standard, classified as a free-cutting stainless mold steel.
 
Its core feature is that while maintaining a certain level of corrosion resistance, it is specially optimized for cutting performance. The machining efficiency is about 20–30% higher than that of ordinary stainless mold steel, with lower tool wear and reduced machining costs.
 
Its alternative name is X33CrS16, and in the Asian market, it is also often referred to as the free-cutting version of 1.2316.
 
DIN 1.2085 steel is usually supplied in a pre-hardened state with a hardness of approximately 290–330 HB. It can be directly machined on the machine tool after receipt without additional heat treatment.
 
The core value for purchasers is: shortened mold delivery cycle, eliminated risk of heat treatment deformation, and reduced overall processing costs by about 15–25%.
DIN 1.2316 chemical component test
DIN 1.2316 chemical component test
DIN 1.2316 material test
DIN 1.2316 material test
DIN 1.2316 Spectrometer test
DIN 1.2316 Spectrometer test
DIN 1.2316 quality test
DIN 1.2316 quality test

2. Chemical Composition of DIN 1.2085 Steel

  • C: 0.33–0.38%
  • Cr: 15.5–16.5%
  • Mo: 0.30–0.50%
  • S: 0.05–0.10%
  • Mn: ≤ 1.00%
  • Si: ≤ 1.00%
Each element has a clear function.
 

Chromium (Cr): 15.5–16.5%

 

This is the core source of corrosion resistance in DIN 1.2085 steel. High chromium content forms a dense passive film on the steel surface, effectively resisting moisture and chemical corrosion. A chromium content above 15% ensures long-term stability in humid and mildly corrosive environments.

 

Molybdenum (Mo): 0.30–0.50%

 

Molybdenum improves pitting corrosion resistance. It is a key protective element in chloride environments. Although the molybdenum content in DIN 1.2085 steel is lower than the 0.80–1.30% in 1.2316, it is sufficient for general corrosive applications.

 

Sulfur (S): 0.05–0.10%

 

This is the most critical differentiating element of DIN 1.2085 steel.

 

Sulfur content is higher than in standard mold steels. Sulfur combines with manganese in the steel to form manganese sulfide (MnS) inclusions. These inclusions act as chip breakers during machining, making chips easier to break and greatly reducing cutting resistance.

 
This is the fundamental reason for the high machining efficiency of DIN 1.2085 steel.

3. Strength of DIN 1.2085 Steel: Tensile, Yield and Impact Properties

Tensile Strength: After quenching and low-temperature tempering, the tensile strength of DIN 1.2085 steel can reach 1600–1900 MPa, which is 3–4 times higher than that of ordinary carbon steel.

Yield Strength: Approximately 1200–1500 MPa. This means the material will not undergo permanent deformation until the stress reaches this value.

Impact Toughness: At room temperature, the impact energy of DIN 1.2085 steel is about 15–25 J. Although slightly lower than that of 1.2316, it is sufficient to withstand the impact loads in most injection molds.

4. Hardness of DIN 1.2085 Steel: Values in Pre-hardened, Quenched and Tempered Conditions

Pre-hardened Condition (Most Common)

  • Hardness range: 30 – 34 HRC
  • Delivery condition: Ready for machining, no heat treatment required
  • Advantages: Time-saving, convenient, zero risk of deformation

Quenched + Low-temperature Tempering (For High Hardness)

  • Hardness range: 48 – 52 HRC
  • Process: Oil quenching at 1020°C + tempering at 200–250°C
  • Advantages: Excellent wear resistance, suitable for filled plastics

Quenched + High-temperature Tempering (Toughness Priority)

  • Hardness range: 35 – 40 HRC
  • Process: Oil quenching at 1020°C + tempering at 550–600°C
  • Advantages: High toughness, resistant to cracking

5. Excellent Corrosion Resistance of DIN 1.2085 Steel

Corrosion resistance is another major advantage of DIN 1.2085 steel, especially when processing corrosive plastics or working in humid environments. DIN 1.2085 steel contains a high chromium content of approximately 15%–17% (some grades have 13%, but the high-corrosion-resistance version typically reaches 15%–17%), which gives it excellent anti-corrosion properties. It effectively resists corrosion from water vapor, weak acids, and plastics that may release corrosive gases during injection molding, such as PVC.

For mechanical design engineers, this means DIN 1.2085 steel can be used for components in contact with corrosive media, extending service life and reducing maintenance. For purchasing managers, choosing DIN 1.2085 steel with superior corrosion resistance avoids premature failure and costly replacement caused by material corrosion, protecting long-term investment.

For example, compared with conventional mold steels, DIN 1.2085 steel can reduce the corrosion rate by more than 80% in humid or chloride-containing environments, significantly improving product reliability.

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Why Choose DIN 1.2085 Steel?

The core value of DIN 1.2085 steel can be summed up in three words: Excellent Machinability.

  • Provided that corrosion resistance requirements are met, it is one of the most cost-effective stainless mold steels in terms of machining.
  • For large molds, complex cavities, and mass production projects, DIN 1.2085 steel can directly help you save 20–30% of machining costs.

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