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ASTM A333 Grade 11
keyword ASTM A333 Grade 11 Category Steel pipe material Related products Get a quoteChemical and mechanical properties of ASTM A333 Grade 11 spiral steel pipes
1、 Chemical composition
Main elements
Carbon (C): 0.05%~0.15% (balance strength and toughness).
Manganese (Mn): 0.30%~0.60% (improves thermal workability and desulfurization).
Silicon (Si): ≤ 0.50% (deoxygenation and enhanced oxidation resistance).
Phosphorus (P) and sulfur (S): both ≤ 0.025% (controlling brittleness and thermal crack sensitivity).
Alloy elements
Chromium (Cr): 1.00%~1.50% (forms oxide film, resistant to high temperature oxidation).
Molybdenum (Mo): 0.44%~0.65% (enhances high-temperature creep strength).
2、 Mechanical performance
Basic performance (room temperature)
Tensile strength (Rm): ≥ 415 MPa (meets the requirements of high-pressure environment).
Yield strength (Rp0.2): ≥ 205 MPa (ensuring structural stability at high temperatures).
Elongation rate (δ%): ≥ 30% (longitudinal, plastic deformation capacity).
High temperature performance
High temperature allowable stress: ≥ 70 MPa at 550 ℃, ≥ 55 MPa at 580 ℃ (applicable to medium and high temperature steam systems).
Antioxidant properties: Excellent (stable operation at 550-600 ℃ for a long time).
3、 Manufacturing and process requirements
Processing technology
Spiral welding process: The weld seam needs to undergo radiographic or ultrasonic testing and complete a hydrostatic test.
Welding control: Low hydrogen welding materials are used, with a preheating temperature of ≥ 150 ℃ and an interlayer temperature of ≥ 200 ℃ (to prevent hydrogen embrittlement).
Heat treatment
Normalization+tempering treatment: Refine grain structure, eliminate residual stress, and ensure consistent performance.
4、 Application scenarios
High temperature and high pressure pipelines: Heating furnaces, steam boiler systems, and chemical reactor pipelines in refining equipment.
Energy equipment: high-pressure boiler heating surface, superheater, reheater, and petrochemical industry pipes.
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