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Q235B material steel pipe
Chemical composition and mechanical properties of Q235B spiral steel pipe material
1、 Chemical composition
Carbon (C): ≤ 0.20%
Silicon (Si): ≤ 0.35%
Manganese (Mn): 0.30%~0.70%
Sulfur (S): ≤ 0.045%
Phosphorus (P): ≤ 0.045%
Other elements (Cr, Ni, Cu, etc.):
Chromium (Cr) ≤ 0.030%, nickel (Ni) ≤ 0.030%, copper (Cu) ≤ 0.030% (allowable residual content)
2、 Mechanical performance
Yield strength (Rp0.2): ≥ 235 MPa
Tensile strength (Rm): 375~460 MPa
Elongation (A): ≥ 26% (longitudinal specimen)
Impact toughness:
Has good toughness and plasticity at room temperature, meeting general engineering requirements
Bending strength ratio: not explicitly required, but the characteristics of low carbon steel make it exhibit excellent plasticity
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.
3、 Other performance and application scenarios
Welding performance:
Adopting processes such as submerged arc welding and shielded metal arc welding, the quality of welded joints is stable
There is no significant embrittlement problem in the heat affected zone after welding
Corrosion resistance:
The corrosion resistance of the substrate is average, and it needs to be improved by painting, galvanizing, or 3PE anti-corrosion treatment to enhance durability
Size and processing:
The outer diameter and wall thickness tolerances of spiral steel pipes comply with industrial standards and are suitable for installation in complex working conditions
Application areas:
Architecture and bridges: structural support, welded components
Fluid transportation: oil, natural gas, chemical pipelines (requiring anti-corrosion technology)
Mechanical Manufacturing: Vehicle and Ship Parts
4、 Summary of Advantages
High cost-effectiveness: Low raw material costs, suitable for large-scale engineering applications
Flexible processing: easy to punch, bend, and weld, suitable for various construction scenarios
Comprehensive performance balance: the balance of strength, plasticity, and toughness meets the requirements of medium and low loads
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
