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ASTM A333 Grade 8
keyword ASTM A333 Grade 8 Category Steel pipe material Related products Get a quoteChemical and mechanical properties of ASTM A333 Grade 8 spiral steel pipes
1、 Chemical composition
Main elements
Carbon (C): ≤ 0.30% (low content to reduce cold brittleness and improve low-temperature toughness).
Manganese (Mn): 0.29%~1.06% (strengthens the matrix, optimizes the balance between strength and toughness).
Silicon (Si): ≥ 0.10% (assisting deoxidation and enhancing strength).
Phosphorus (P) and sulfur (S): both ≤ 0.025% (strictly limit impurities to reduce the risk of low-temperature embrittlement).
Alloy elements
Nickel (Ni), vanadium (V), niobium (Nb): may be added to enhance low-temperature toughness (by optimizing low-temperature performance through alloying).
2、 Mechanical performance
Strength and plasticity
Tensile strength (Rm): ≥ 415 MPa (meets low-temperature pressure requirements).
Yield strength (Rp0.2): ≥ 240 MPa (ensuring structural stability under low temperature conditions).
Elongation rate (δ%): Longitudinal ≥ 30% (high plasticity ensures impact resistance).
Low temperature toughness
Impact energy (KV): Passed the Charpy impact test at -100 ℃ to -195 ℃ (applicable to extreme low temperature environments).
3、 Manufacturing and process requirements
Processing technology
Spiral welding process: The weld seam needs to undergo radiographic or ultrasonic testing and complete a water pressure test without defects.
Welding materials: Low hydrogen welding materials should be selected to ensure that the performance of the weld seam is consistent with that of the base material.
Heat treatment
Normally, normalizing treatment (above 800 ° C) is required to refine grain size and improve low-temperature performance.
Special scenarios may require tempering treatment to eliminate residual stress.
4、 Application scenarios
Extreme low-temperature fluid transportation: pipeline systems for liquefied natural gas (LNG), liquid nitrogen, liquid oxygen and other media.
Low temperature pressure vessels: LNG storage tanks, low-temperature heat exchangers, and chemical equipment pipelines.
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