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ASTM A333 Grade 6
keyword ASTM A333 Grade 6 Category Steel pipe material Related products Get a quoteChemical and mechanical properties of ASTM A333 Grade 6 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, improving strength and oxidation resistance).
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 (further optimized performance through alloying in versions after 2016).
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%, transverse ≥ 16.5% (high plasticity ensures impact resistance).
Low temperature toughness
Impact energy (KV): Passed the Charpy impact test at -45 ℃ (applicable to low temperature environments of -45.6 ℃ and below).
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: It is necessary to select matching welding materials (such as low hydrogen welding rods) to ensure that the weld performance is consistent with the base material.
Heat treatment
Normally, normalizing treatment (above 815 ° C) is required to refine the grain and improve the consistency of low-temperature performance.
Special scenarios may require tempering treatment to eliminate residual stress.
4、 Application scenarios
Low temperature fluid transportation: pipeline systems for media such as liquefied natural gas (LNG) and liquid nitrogen.
Chemical and energy equipment: low-temperature storage tanks, heat exchangers, and pressure vessel pipelines.
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