Description
Dillidur 400: High-Strength Wear-Resistant Steel
Dillidur 400 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.12 – 0.18 |
| Silicon (Si) | ≤ 0.70 |
| Manganese (Mn) | 1.00 – 1.50 |
| Phosphorus (P) | ≤ 0.025 |
| Sulfur (S) | ≤ 0.010 |
| Chromium (Cr) | 0.40 – 0.80 |
| Nickel (Ni) | ≤ 0.50 |
| Molybdenum (Mo) | ≤ 0.50 |
| Boron (B) | ≤ 0.005 |
Dillidur 400 Mechanical Properties
| Property | Value |
| Hardness (HBW) | 370 – 430 |
| Yield Strength (MPa) | ≥ 1000 |
| Tensile Strength (MPa) | 1250 – 1450 |
| Elongation (%) | ≥ 10 |
| Impact Strength (J) | 20J at -40°C |
Dillidur 400 Physical Properties
| Property | Value |
| Density (g/cm³) | 7.85 |
| Thermal Conductivity (W/m.K) | ~45 |
| Specific Heat Capacity (J/kg.K) | ~480 |
| Electrical Resistivity (μΩ.m) | ~0.2 |
Dillidur 400 plate sizes
- Thickness range: 6mm to 150mm
- Width range: 1250mm to 2500mm
- Length range: 3000mm to 6000mm
Possible Alternative Grades
| Grade | Equivalent Standard |
| Hardox 400 | SSAB |
| XAR 400 | Thyssenkrupp |
| Raex 400 | Ruukki |
| JFE EH400 | JFE Steel |
| AR 400 | Various Manufacturers |
Chemical Formula
Dillidur 400 does not have a fixed chemical formula but is composed primarily of iron (Fe) with carbon (C), manganese (Mn), chromium (Cr), and other alloying elements.
Grade Specification Comparison
| Standard | Dillidur 400 Equivalent |
| EN 10083 | 42CrMo4 |
| ASTM | A514 Grade B |
| DIN | 1.8715 |
| JIS | JFE-EH400 |
Corrosion Resistance
Dillidur 400 is primarily designed for wear resistance, not corrosion resistance. However, due to the presence of chromium, it offers moderate resistance to atmospheric corrosion. For highly corrosive environments, protective coatings or stainless steel cladding may be required.
Heat Resistance
Dillidur 400 maintains its hardness up to approximately 250°C – 300°C. Prolonged exposure to higher temperatures may lead to softening and reduction in mechanical properties.
Heat Treatment
Dillidur 400 is supplied in a quenched and tempered condition and does not require further heat treatment. Reheating above 250°C may alter the hardness and mechanical properties.
Welding
Dillidur 400 can be welded using conventional welding processes such as:
- MMA (Manual Metal Arc)
- MAG (Metal Active Gas)
- SAW (Submerged Arc Welding)
Preheating (150°C – 200°C) is recommended to minimize the risk of hydrogen cracking. Post-weld heat treatment is usually unnecessary but can be applied to relieve stress in thicker sections.
Fabrication
Dillidur 400 can be cut, bent, drilled, and machined using conventional equipment. Due to its high hardness, carbide-tipped tools are recommended for machining. Flame or plasma cutting is preferred for precise cuts.
Applications
Dillidur 400 is widely used in industries where wear resistance is critical. Common applications include:
- Mining Equipment (dump truck bodies, liners, hoppers)
- Construction Machinery (bulldozer blades, excavator buckets, wear plates)
- Material Handling (conveyor chutes, mill liners, silos)
- Agricultural Equipment (plow blades, scrapers)
- Railway Industry (wagon floors, side panels)
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