1.2842 Material Detailed Information
1.2842 is a high-carbon tool steel that is primarily used for cold work tooling. It is known for its excellent wear resistance, high hardness, and good machinability. 1.2842 is suitable for tools that are exposed to abrasive wear and high mechanical stress. This material is often used in cutting tools, dies, and blades that require durability and sharpness over extended periods.
The steel’s high carbon content gives it superior hardness, while the low content of alloying elements like chromium and molybdenum makes it less expensive than more complex high-performance steels, making it an excellent choice for budget-sensitive tooling applications.
Key Features
- High Hardness: After heat treatment, 1.2842 can achieve hardness levels of 58-62 HRC, making it ideal for applications requiring sharp cutting edges and abrasive wear resistance.
- Excellent Wear Resistance: The material offers good resistance to wear and abrasive conditions, making it perfect for cutting tools, dies, and blades exposed to repetitive use.
- Good Machinability: 1.2842 has good machinability in its annealed state, allowing it to be shaped and formed into precise tools and components.
- Moderate Toughness: While it provides excellent hardness and wear resistance, 1.2842 has moderate toughness compared to tougher steels, which can make it more prone to brittleness under impact loading.
- Moderate Corrosion Resistance: The chromium content adds moderate corrosion resistance, making it suitable for tools used in mildly corrosive environments.
Chemical Composition
| Element | Composition (%) |
| Carbon (C) | 0.90 – 1.05 |
| Silicon (Si) | 0.20 – 0.40 |
| Manganese (Mn) | 0.30 – 0.60 |
| Chromium (Cr) | 0.50 – 1.00 |
| Molybdenum (Mo) | 0.20 – 0.40 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.030 |
Note: The material’s high carbon content provides its excellent hardness, while the chromium content helps with moderate corrosion resistance.
Mechanical Properties
| Property | Value |
| Hardness (Annealed) | ≤ 250 HB |
| Hardness (Hardened & Tempered) | 58 – 62 HRC |
| Tensile Strength | ~1,200 – 1,300 MPa |
| Yield Strength | ~1,100 MPa |
| Elongation | 6 – 10% |
| Impact Toughness | Moderate |
1.2842 vs. D2 vs. O1 (AISI)
| Property | 1.2842 | D2 (AISI) | O1 (AISI) |
| Hardness (Tempered) | 58-62 HRC | 58-62 HRC | 55-60 HRC |
| Wear Resistance | Good | Excellent | Good |
| Toughness | Moderate | Moderate | Good |
| Machinability | Good | Moderate | Excellent |
| Corrosion Resistance | Moderate | Moderate | Poor |
| Cost | Low | Moderate | Moderate |
Applications
1.2842 is widely used for cold work tooling applications, including:
- Cutting tools, such as saws, blades, and drills, requiring sharpness and wear resistance.
- Blanks and cutting dies used in stamping and blanking operations.
- Forming dies and punches in industries requiring high precision and durability.
- Extrusion dies and cold heading dies used in metalworking and plastic molding.
- Automotive tooling and manufacturing tools exposed to moderate wear and high stress.
Heat Treatment Process
Annealing
- Heat to 800–850°C, then allow the material to cool slowly to relieve internal stresses and soften the steel.
Hardening
- Heat to 1,000–1,050°C and soak for the necessary time, then quench in oil or air to achieve high hardness.
Tempering
- Temper to 400–500°C to achieve a hardness of 58-62 HRC, ensuring good wear resistance and toughness for tooling applications.
Surface Treatment
- Surface treatments like nitriding or PVD coating can improve the wear resistance and surface hardness in demanding applications.
Alternative Materials
- D2 (AISI): A high-carbon, high-chromium tool steel with superior wear resistance and hardness compared to 1.2842 but offers moderate toughness.
- O1 (AISI): A low-alloy tool steel with better machinability than 1.2842 but lower wear resistance and hardness.
- AISI M2: A high-speed steel with excellent wear resistance at high temperatures, but it’s more expensive and less suited for applications not involving high-speed processes.
Conclusion
1.2842 is a high-carbon tool steel that provides excellent hardness and good wear resistance, making it ideal for cold work tooling such as cutting tools, blades, dies, and punches. With moderate toughness, it performs well in abrasive conditions where durability and sharpness are required. The material is also cost-effective, offering an excellent balance of performance and price for industries like automotive, manufacturing, and metalworking.
