Description
Dillidur 500 – Superior Wear-Resistant Steel
Dillidur 500 is a high-performance steel designed for extreme abrasion resistance. With a higher hardness level compared to Dillidur 450, it is optimized for use in industries where materials undergo heavy wear and impact. Below is a detailed guide covering the specifications, chemical composition, mechanical properties, and more.
Specification:
- Grade: Dillidur 500
- Type: Wear-resistant steel
- Surface Hardness: Approximately 500 HB
- Applications: Mining, construction, material handling, recycling, and quarrying industries
- Delivery Condition: Quenched and tempered for enhanced hardness and toughness
Dillidur 500 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.14 - 0.20 |
| Manganese (Mn) | 1.00 - 1.50 |
| Silicon (Si) | ≤ 0.50 |
| Chromium (Cr) | 0.30 - 0.60 |
| Nickel (Ni) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.10 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.015 |
| Iron (Fe) | Balance |
Dillidur 500 Mechanical Properties
| Property | Value |
|---|---|
| Hardness (Brinell) | 450 - 500 HB |
| Yield Strength (min) | 1,400 MPa (203,000 psi) |
| Tensile Strength (min) | 1,600 MPa (232,000 psi) |
| Elongation (A5) | 10% |
| Impact Toughness | ≥ 27 J (at -20°C) |
| Modulus of Elasticity | ~210 GPa (30,500 ksi) |
Dillidur 500 Physical Properties
| Property | Value |
|---|---|
| Density | ~7.85 g/cm³ |
| Melting Point | ~1,500°C (2,732°F) |
| Thermal Conductivity | ~45 W/m·K |
| Coefficient of Thermal Expansion | ~12 x 10⁻⁶ /°C |
| Electrical Resistivity | ~0.5 - 0.6 μΩ·m |
Possible Alternative Grades Table
| Alternate Grade | Characteristics |
| Hardox 500 | Similar wear resistance and toughness for severe conditions |
| Raex 500 | Equivalent performance with a focus on high abrasion resistance |
| Bisalloy 500 | A comparable grade with strong impact and wear resistance |
Chemical Formula
The chemical formula for Dillidur 500 is composed of the major elements:
- C₀.₄₈Fe₉₄.₆₆Mn₁.₂₆Cr₀.₁₀Mo₀.₃₂
Grade Specification Comparison Table
| Property/Grade | Dillidur 500 | Hardox 500 | Raex 500 | Bisalloy 500 |
|---|---|---|---|---|
| Yield Strength | 1100 MPa | 1050 MPa | 1000 MPa | 1100 MPa |
| Tensile Strength | 1300 MPa | 1250 MPa | 1200 MPa | 1250 MPa |
| Hardness | 500 HB | 500 HB | 500 HB | 500 HB |
| Elongation | 5% | 4% | 5% | 6% |
Corrosion Resistance
While Dillidur 500 is primarily designed for abrasion resistance, it does not have significant resistance to corrosion in highly corrosive environments. The steel’s performance in this regard is adequate for industrial and construction applications, but for environments with exposure to moisture or chemicals, additional corrosion protection measures such as coating or galvanizing may be necessary.
Heat Resistance
Dillidur 500 performs well in high-temperature conditions but is not intended for continuous service at temperatures above 500°C. Prolonged exposure to elevated temperatures can lead to softening of the material. For applications involving higher temperature exposure, alternate alloys designed for heat resistance should be considered.
Heat Treatment
- Tempering: The steel is tempered to optimize its hardness and wear resistance.
- Quenching: Quenching at high temperatures and rapidly cooling in water or oil produces the desired hardness.
- Preheating for Welding: Preheating at temperatures around 150-250°C before welding is recommended to prevent cracking.
Welding:
Due to the high hardness of Dillidur 500, welding can be more challenging compared to lower-strength steels. It is recommended to use low-heat input welding methods like TIG or MIG welding to avoid potential cracks. Additionally, selecting wear-resistant welding consumables helps maintain the integrity of the material after welding.
Fabrication:
Dillidur 500 is difficult to machine or fabricate due to its high hardness. Cutting, drilling, and other machining operations require specialized equipment. Carbide tools or high-speed steel tools should be used for effective machining. Reducing cutting speed and using coolant during the process can also improve tool life and machining efficiency.
Applications:
Dillidur 500 is widely used in industries that require materials capable of withstanding severe wear conditions. Some of its primary applications include:
- Mining: Crusher liners, chutes, and hoppers
- Construction: Excavator buckets, bulldozer blades, and material handling equipment
- Material Handling: Conveyor components, hoppers, and screens
- Recycling: Shredder blades, recycling crushers, and drum liners
- Quarrying: Jaw and impact crusher parts, and other high-wear components
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