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Q355C material steel pipe
Chemical composition and mechanical properties of Q355C spiral steel pipe material
1、 Chemical composition
Carbon (C): 0.10%~0.25%
Silicon (Si): ≤ 0.55%
Manganese (Mn): 1.00%~1.70%
Phosphorus (P): ≤ 0.035%
Sulfur (S): ≤ 0.035%
Alloy elements:
Vanadium (V): 0.02%~0.15%
Aluminum (Al): ≥ 0.015%
Chromium (Cr), nickel (Ni), copper (Cu): ≤ 0.30% (single element)
Niobium (Nb), titanium (Ti), molybdenum (Mo): trace addition to enhance strength and toughness
Note: If the total amount of alloy is less than 3%, it is classified as 350MPa grade low-alloy steel according to strength; The control of impurity elements (P, S) in C-grade steel is stricter than that in B-grade steel.
2、 Mechanical performance
Yield strength (Rp0.2): ≥ 355 MPa
Tensile strength (Rm): 470~630 MPa
Bending strength ratio (Rp0.2/Rm): ≤ 0.90, material plasticity
Elongation (A): ≥ 21% (longitudinal specimen)
Impact toughness:
Impact energy at room temperature: ≥ 34 J (longitudinal specimen)
Low temperature toughness: -20 ℃ impact toughness needs to be determined according to the contract agreement
Welding performance:
Carbon equivalent (Ceq) ≤ 0.45%, stable welding joint quality
Weld seams require ultrasonic testing (100% coverage)
3、 Other technical requirements
Manufacturing process:
Manufacturing process:
Adopting spiral submerged arc welding (SAWH) process, the weld seam needs to pass non-destructive testing, TVRT radiographic testing, with a coverage rate of 100%
After welding is completed, a hydrostatic pressure test is required, and the test pressure shall be carried out according to the standard requirements
The residual height of the weld seam is ≤ 3.2mm, and there are no defects such as cracks or lack of fusion on the inner and outer surfaces.
Application scenarios:
High pressure pipelines: oil, natural gas, fertilizer transportation pipelines
Building structure: bridges, load-bearing brackets for high-rise buildings
Mechanical components: construction machinery, vehicle structural components
ADD：Chengnan Industrial Development Zone, Yanshan County, Hebei Province
Domestic phone number：0086-317-6689999
International call：0086-317-6165555
E-mail:9905791@qq.com
