DIN 1.2379

2379 steel is a high-carbon, high-chromium tool steel known for its excellent hardness and wear resistance. 

Composition:

- Carbon (C): 1.40 - 1.60%

- Chromium (Cr): 11.00 - 13.00%

- Molybdenum (Mo): 0.70 - 1.20%

- Vanadium (V): 0.50% max (optional, sometimes included for grain refinement)

Properties:

- Hardness: Typically around 58-62 HRC (Rockwell Hardness)

- Density: ~7.7 g/cm³

- Tensile Strength: 650-900 MPa (94,000-130,000 psi)

- Yield Strength: ~500 MPa (73,000 psi)

- Elongation: ~10-15%

- Thermal Conductivity: 24 W/m-K at 100°C

- Coefficient of Thermal Expansion: 11.5 µm/m°C (20-100°C)

Heat Treatment:

- Annealing: Heat to 800-850°C (1470-1560°F), slow cooling in furnace.

- Hardening: Preheat at 750-800°C (1380-1470°F), then raise to 1000-1040°C (1830-1900°F), quench in air or oil.

- Tempering: Temper immediately after hardening. Typical tempering temperature ranges from 150-550°C (300-1020°F) depending on desired hardness and toughness.

Applications:

- 2379 steel is widely used in manufacturing cutting tools, dies, punches, and forming tools.

- It is favored for applications requiring high wear resistance, such as blanking and forming dies for cutting and stamping operations.

Machinability:

- 2379 steel is machinable in the annealed condition, but due to its high hardness after heat treatment, it can be challenging to machine.

Corrosion Resistance:

- Good resistance to corrosion due to its high chromium content. However, it is not stainless and can rust if not properly maintained.

Weldability:

- 2379 steel is not readily weldable due to its high carbon and chromium content. Preheating and post-weld heat treatment are necessary to avoid cracking and achieve acceptable results.

2379 steel's combination of high hardness, wear resistance, and moderate toughness makes it suitable for a variety of tooling applications where high performance under abrasive conditions is required.