A514 Grade B is a high-strength, quenched and tempered Alloy steel plate standardized under ASTM A514/A514M, primarily used in structural applications requiring exceptional strength and weldability. Here's a detailed breakdown of its characteristics:
1. Chemical Composition
Key alloying elements (by weight %) ensure balanced strength and toughness:
Carbon (C): 0.12–0.21%
Manganese (Mn): 0.70–1.00%
Chromium (Cr): 0.40–0.65%
Molybdenum (Mo): 0.15–0.25%
Vanadium (V): 0.03–0.08%
Low impurities: Phosphorus (P) ≤0.030%, Sulfur (S) ≤0.030% .
2. Mechanical Properties
Achieved through quenching and tempering heat treatment:
Yield Strength: ≥690 MPa (100 ksi)
Tensile Strength: 760–895 MPa (110–130 ksi)
Elongation: ≥18% (in 50 mm)
Hardness: 235–293 HBW (Brinell)
Impact Toughness: High Charpy impact values, suitable for low-temperature environments .
3. Manufacturing Process
Produced via strict controls:
Electric arc furnace melting → Ladle refinement → Vacuum degassing → Controlled rolling → Quenching (rapid cooling) → Tempering (stress relief) .
4. Applications
Ideal for heavy-load and high-stress structures:
Construction Equipment: Cranes, mining shovels, excavator booms.
Infrastructure: Bridges, offshore platforms, hydraulic supports.
Transportation: Mining trucks, crane arms.
Special Features: Excellent weldability and Z-directional properties (resists lamellar tearing, grades Z15-Z35) .
5. Advantages over Similar Grades
Higher yield strength than standard carbon steels (e.g., ASTM A36).
Better weldability and toughness compared to some high-alloy steels .
Retains performance in extreme conditions (-50°C to 410°C) .
Key Takeaway
A514 Grade B combines strength, durability, and versatility, making it a top choice for critical engineering structures where safety and longevity are paramount. Its standardized properties ensure reliability across global projects, from skyscrapers to deep-sea platforms.
For material certification or specific processing (e.g., cutting, welding), consult suppliers adhering to ASTM A514M standards .
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