Rockhard 400 Plate is a premium abrasion-resistant steel plate engineered for extremely high wear and impact conditions. Its made through quenching and tempering (Q + T) processes that optimize hardness and toughness simultaneously. This steel is widely used in mining, earthmoving, material handling equipment, heavy machinery parts, dump truck liners, hoppers, crushers, and structural components where high resistance to wear extends service life and reduces downtime.
Composition can vary slightly by thickness and manufacturer, but a representative range for Rockhard 400 is:
| Element | Typical % (max) |
|---|---|
| Carbon (C) | Up to 0.27% (varies with thickness) |
| Silicon (Si) | Up to 0.70% |
| Manganese (Mn) | Up to 1.60% |
| Phosphorus (P) | 0.025% |
| Sulfur (S) | 0.0100.025% |
| Chromium (Cr) | Up to 1.40% (varies) |
| Nickel (Ni) | Up to 1.50% |
| Molybdenum (Mo) | Up to 0.60% |
| Boron (B) | 0.004% |
| Carbon Equivalent (CEV/CET) | Typical values 0.280.48 depending on thickness |
| Property | Typical Value |
|---|---|
| Hardness | 400 HBW nominal (BHN) High abrasion resistance |
| Yield Strength (min) | 1000 MPa |
| Tensile Strength (min) | 12501400 MPa |
| Elongation | 1012% |
| Impact Toughness | Typically measured at low temp (e.g., 2745 J at 40 C) |
High Abrasion Resistance: 400 BHN hardness gives excellent wear life in harsh service.
Good Toughness & Strength: High yield and tensile strength help withstand impact and heavy loads.
Heat-Treated (Q + T): Optimized balance of hardness plus ductility.
Weldable & Fabricable: Controlled chemistry supports reliable welding in field and fabrication work.
Dump truck and trailer liners
Mining machinery (crushers, chutes, hoppers)
Loader and excavator buckets
Conveyor components
Earthmoving and heavy construction equipment
Industrial machinery where abrasion wear limits component life
Thickness: 3 mm to 150 mm (sometimes up to 200 mm)
Width: 500 mm to 3000 mm
Length: 1000 mm to 12000 mm




Price:
Color : Natural Steel
Product Form : Plates
Hardness : High
Application : Other, Industrial and structural applications
Color : Grey
Product Form : Plate
Hardness : 500 HB
Application : Structural applications wearresistant applications, Other
Color : Gray
Product Form : Sheet or plate
Hardness : 400 HBW
Application : Wearresistant applications, Other
Price 125.0 INR / Kilograms
Minimum Order Quantity : 500 Kilograms
Product Form : Solid
Hardness : Yes
Application : Construction