Key Characteristics:
Application: Primarily used in welded pressure vessels and boilers.
Temperature Service: Suitable for moderate and low-temperature applications.
Nickel Content: Grade E typically contains 2.25% nickel.
Benefits: Improved fracture toughness and fatigue resistance compared to standard carbon steels.
Thickness: Maximum thickness is typically 150mm (6 inches).
Standard: ASTM A203/A203M.
1. What are the mechanical properties of Grade E? What breakthroughs have been made in its low-temperature impact toughness?
Performance parameters Grade E requirements Test conditions
Tensile strength ≥485 MPa (70 ksi) ASTM A370
Yield strength ≥310 MPa (45 ksi) ASTM A370
Elongation (50mm) ≥22% ASTM A370
Impact toughness ≥34J Charpy V-notch at -170°C
2. What are the key technical points of Grade E welding? How to avoid low-temperature HAZ embrittlement?
Welding process specifications:
Welding material matching:
TIG welding: ERNiCrMo-3 (containing 5% Ni)
SAW: Ni-Cr-Mo welding wire + basic flux
Process control:
Preheating 180-200°C (50°C higher than Grade D)
Heat input ≤25 kJ/cm
Mandatory back argon protection
HAZ optimization measures:
Aging treatment at 620°C×4h immediately after welding
Slow cooling in the range of 400-600°C is prohibited (to prevent σ phase precipitation)
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