Supreme Steels

30KHRA

Product Description:

30KHRA is a structural steel designed for applications where high mechanical strength and wear resistance are essential. It is often used in manufacturing parts subject to heavy loads and wear, such as gears, shafts, and other machine components. The addition of chromium improves hardness and corrosion resistance, while manganese enhances toughness. This is a low-alloy steel grade known for its high strength, wear resistance, and good toughness. It is commonly used in applications requiring durability, especially in heavy-duty machinery and structural components.

Chemical Composition:

Element Composition (%)
Carbon (C) 0.28–0.34
Chromium (Cr) 1.0–1.3
Manganese (Mn) 0.5–0.8
Silicon (Si) ≤ 0.37
Nickel (Ni) ≤ 0.3
Phosphorus (P) ≤ 0.035
Sulfur (S) ≤ 0.035
Iron (Fe) Balance

Mechanical Properties:

Property Value
Yield Strength (σ₀.₂) ≥ 540 MPa
Ultimate Tensile Strength (σᵤ) 750–950 MPa
Elongation (δ₅) ≥ 12%
Impact Toughness (KCU) ≥ 50 J/cm²
Hardness (HB) 250–300 (after heat treatment)

Physical Properties:

Property Value
Density 7.85 g/cm³
Thermal Conductivity ~46 W/m·K
Specific Heat Capacity 460 J/kg·K
Melting Point ~1450°C

Heat Treatment:

Applications:

Corrosion Resistance

While 30KHRA is not primarily designed for corrosion resistance, its chromium content provides moderate protection against atmospheric corrosion. For enhanced corrosion resistance, surface treatments like galvanization or coating may be applied.