SKD11 (AISI D2) Steel: Properties, Applications, and Belinker’s Machining Expertise

Hello, this is Belinker.

Among the wide range of tool steels used in manufacturing, SKD11 (AISI D2, DIN 1.2379) stands out as one of the most widely applied materials for cold work tooling and precision machining. Known for its high hardness, excellent wear resistance, and dimensional stability, SKD11/D2 has become the industry standard for cold work dies, cutting tools, and critical industrial components.

At Belinker Manufacturing, we don’t just supply SKD11/D2 steel—we provide end-to-end solutions including material sourcing, precision machining, and project-specific consultation. In this article, we will introduce the properties of SKD11 (AISI D2), its common applications, machining considerations, and why Belinker is the right partner for your projects.

What is SKD11 (AISI D2)?

SKD11 (according to Japanese JIS standards) and AISI D2 (according to American standards) are essentially the same grade of high-carbon, high-chromium cold work tool steel. In Europe, it is also known as DIN 1.2379.

• Classification: Cold work die steel

• Key Alloying Elements:

  • Carbon (C): 1.40–1.60%

  • Chromium (Cr): 11.0–13.0%

  • Molybdenum (Mo): 0.70–1.20%

  • Vanadium (V): 0.20–0.50%

This alloy composition gives SKD11/D2 its unique properties: high hardness, excellent wear resistance, and good dimensional stability even after heat treatment.

Key Properties of SKD11 (AISI D2)

1. High Hardness

   • Achieves HRC 58–62 after heat treatment.

   • Ideal for dies, punches, and cutting tools under heavy load.

2. Excellent Wear Resistance

   • High carbon and chromium content makes it highly resistant to abrasion.

   • Extends tool life in demanding conditions.

3. Dimensional Stability

   • Minimal distortion after heat treatment.

   • Suitable for precision parts requiring tight tolerances.

4. Corrosion Resistance

   • Not stainless, but chromium content provides better resistance than typical tool steels.

Typical Applications of SKD11 (AISI D2)

• Cold Work Dies: Blanking dies, punching dies, forming tools

• Cutting Tools: Shear blades, industrial knives, shredder knives

• Industrial Components: Gears, bearings, rollers, press parts

• Automotive & Electronics: Precision dies for parts production

In short, SKD11/D2 is chosen wherever high strength, precision, and long service life are critical.

Machining Considerations for SKD11 (AISI D2)

Although SKD11/D2 offers excellent performance, it presents challenges in machining:

• Difficult to Cut: Its high hardness leads to rapid tool wear. Carbide or coated tools (e.g., TiAlN) are recommended.

• Heat Treatment: Low distortion but stress-relief is advisable for large parts.

• Grinding: Required for surface finishing; overheating must be avoided to prevent grinding cracks.

• Cost: More expensive than general-purpose steels, but justified by tool life and performance.

Comparison with Other Tool Steels

Belinker’s Expertise in SKD11 (AISI D2)

Belinker Manufacturing provides more than raw material—we deliver comprehensive support for SKD11/D2 projects:

1. Material Supply

   • Reliable sourcing from domestic and international steel mills

   • Customized procurement based on cost, delivery, and specifications

2. Machining Capabilities

   • CNC, MCT, grinding, EDM machining of SKD11/D2

   • Precision tolerances up to ±0.01mm

3. Quality Assurance

   • Ultrasonic testing, hardness checks, crack inspection

   • Strict compliance with client specifications

4. Industry Experience

   • Automotive, electronics, semiconductor, and plant industries

   • Proven track record in cost optimization and lead-time management

Conclusion & Contact

SKD11 (AISI D2) is a high-performance tool steel that delivers excellent hardness, wear resistance, and stability—making it the go-to choice for cold work dies and cutting tools. However, its machining challenges require expertise, advanced equipment, and strict quality control.

Belinker Manufacturing has the experience, facilities, and global sourcing network to ensure your SKD11/D2 projects succeed.

📩 Inquiries: support@belinker.co.kr
🌐 Website: https://belinker.co.kr