ASTM A633 Grade E High-Strength Low-Alloy Structural Steel

Grade Designation Breakdown:
A: Denotes the ASTM standard;
633: Indicates the yield strength rating of the steel plate (e.g., the yield strength of A633 Gr. E is 415 MPa);
Gr. E: Quality grade (Grade E), representing the highest grade; it passes low-temperature impact testing at -40°C.
 
Applicable Standard:
ASTM A633/A633M; production thickness range: 8–150 mm; steelmaking process: basic oxygen furnace or electric arc furnace refining.
 
ASTM A633 Gr. E Chemical Composition:
Base elements: Carbon (C ≤ 0.22%), Silicon (Si 0.15–0.50%), Manganese (Mn 1.15–1.50%);
Alloying elements: Vanadium (V 0.15–0.40%), Niobium (Nb 0.01–0.05%), as well as Copper, Nickel, Chromium, and Molybdenum (with stricter limits for Grade E).
 
ASTM A633 Gr. E Mechanical Properties:
Yield strength: ≥415 MPa;
Tensile strength: 550–690 MPa;
Elongation: ≥18%;
Impact toughness: Maintains excellent toughness at -40°C.
 
ASTM A633 Gr. E Applications:
Structures for extreme operating conditions: e.g., mega-bridges, nuclear reactor pressure vessels, offshore drilling platforms, etc.;
Equipment for low-temperature environments: e.g., polar engineering projects, cryogenic storage tanks, and other applications involving dynamic loads;
Heavy machinery: e.g., mining equipment, hydraulic supports, etc.
 
Processing and Delivery:
Delivery condition: Primarily normalized (air-cooled after high-temperature austenitizing); double normalization is required for thicknesses exceeding 75 mm.