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ASTM A333 Grade 3
keyword ASTM A333 Grade 3 Category Steel pipe material Related products Get a quoteChemical and mechanical properties of ASTM A333 Grade 3 spiral steel pipes
1、 Chemical composition
Main elements
Carbon (C): 0.04%~0.19% (control low content to improve low-temperature toughness).
Manganese (Mn): 0.44%~1.65% (enhances strength, synergistically optimizes low-temperature performance with carbon).
Silicon (Si): ≤ 0.30% (some specifications require 0.18%~0.37%).
Phosphorus (P) and sulfur (S): both ≤ 0.025% (strictly control impurity elements).
Alloy elements
Nickel (Ni): 3.18%~3.82% (significantly improves low-temperature toughness and reduces the risk of cold brittleness).
2、 Mechanical performance
Strength and plasticity
Tensile strength (Rm): ≥ 415~450 MPa (meets the low-temperature pressure requirements).
Yield strength (Rp0.2): ≥ 240-295 MPa (structural stability at low temperatures).
Elongation rate (δ%): Longitudinal ≥ 30%, transverse ≥ 20% (high plasticity ensures impact resistance).
Low temperature toughness
Impact energy (KV): ≥ 27 J at -50 ℃, suitable for extremely low temperature environments of -100 ℃ (verified by Charpy impact test).
3、 Manufacturing and process requirements
Processing technology
Spiral welding process: Non destructive testing (radiographic/ultrasonic testing) and hydrostatic testing are required to ensure that the weld seam is defect free.
Welding treatment: It is recommended to preheat the welding material (to reduce the risk of cracking), and heat treatment is usually not required after welding.
Heat treatment
Some scenes require normalizing treatment to refine grain size and improve consistency in low-temperature performance.
4、 Application scenarios
Low temperature fluid transportation: media such as liquefied natural gas (LNG) and liquid nitrogen, suitable for low-temperature pipeline systems in the petroleum and chemical industries.
Pressure vessels and heat exchangers: equipment such as low-temperature storage tanks and heat exchanger pipelines.
Note: In practical applications, it is necessary to verify the manufacturing process and testing procedures in conjunction with ASTM A333 standards and supporting specifications.
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