30KHRA
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Product Description:
30KHRA is a high-strength alloy steel known for its exceptional hardness, toughness, and resistance to wear and fatigue. This steel is primarily used in demanding applications that require a combination of high mechanical strength and resistance to thermal and wear stresses. It is commonly used in manufacturing parts such as gears, shafts, bolts, and other mechanical components exposed to high levels of stress, wear, and cyclic loading. The alloy is well-suited for heavy-duty industries such as automotive, machinery, aerospace, and heavy equipment.
Features:
- High Strength: 30KHRA steel provides excellent tensile strength, making it ideal for components subjected to high mechanical stress.
- Wear Resistance: This steel demonstrates good resistance to wear, making it suitable for applications with moderate-to-high friction and abrasive conditions.
- Fatigue Resistance: 30KHRA offers superior fatigue resistance, allowing it to withstand repeated loading and unloading without failure.
- Toughness: The steel offers good toughness, making it resistant to brittle fracture under impact or shock loading.
- Heat Resistance: 30KHRA has good resistance to elevated temperatures, maintaining its mechanical properties even in hot environments.
- Machinability: It offers reasonable machinability, but its high strength and hardness may require special tooling during fabrication.
- Weldability: 30KHRA can be welded using standard welding techniques, though preheating and post-weld heat treatment are necessary for thicker sections to prevent cracking.
Specifications:
- GOST 4543-71 (Russia): This is a Russian standard that covers 30KHRA steel, ensuring its suitability for heavy-duty mechanical components.
- ISO 683-1: This international standard includes alloy steels used for various mechanical applications, including 30KHRA.
- DIN 17200: European standard for structural and alloy steels, including applications of 30KHRA steel in the industry.
Composition of 30KHRA Steel:
Element | Percentage |
---|---|
Carbon (C) | 0.28 – 0.35% |
Manganese (Mn) | 0.60 – 0.90% |
Silicon (Si) | 0.15 – 0.40% |
Chromium (Cr) | 0.90 – 1.20% |
Nickel (Ni) | 1.50 – 2.00% |
Phosphorus (P) | 0.035% Max |
Sulfur (S) | 0.035% Max |
Iron (Fe) | Balance |
Physical Properties:
Property | Value |
---|---|
Density | 7.85 g/cm³ |
Melting Point | 1450°C (2642°F) |
Hardness (Brinell) | 200-250 HB |
Tensile Strength | 750-950 MPa (108,000-138,000 psi) |
Yield Strength | 550-750 MPa (80,000-108,000 psi) |
Elongation | 12-18% |
Modulus of Elasticity | 210 GPa |
Thermal Conductivity | 46 W/m·K |
Coefficient of Thermal Expansion | 11.5 × 10⁻⁶ /°C |