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ASTM A671 CA55
keyword ASTM A671 CA55 Category Steel pipe material Related products Get a quoteASTM A671 CA55 Material Spiral Steel Pipe Technical Specification and Application
1、 Standards and Material Definitions
Execution standard: ASTM A671 is the standard for electric fusion welded steel pipes, suitable for medium and low temperature (-29 ℃~+343 ℃) pressure vessels and pipeline systems. CA55 is the steel grade code, representing carbon manganese steel material, and the corresponding plate standard is ASTM A285 Gr. C.
Applicable scenarios: Chemical plants, power equipment (such as boiler pipelines), nuclear power auxiliary systems, and other medium and low voltage environments.
2、 Chemical composition and mechanical properties
Chemical composition requirements
Basic elements: carbon (C) ≤ 0.30%, manganese (Mn) 0.60-1.35%, sulfur (S) ≤ 0.035%, phosphorus (P) ≤ 0.035%.
Alloy design: Low sulfur and phosphorus control to improve welding performance, suitable for spiral forming process.
Mechanical performance parameters
Yield strength: ≥ 205 MPa (room temperature).
Tensile strength: ≥ 380-515 MPa (based on A285 Gr. C sheet).
Low temperature toughness: optional -46 ℃ impact test (additional requirements need to be specified).
3、 Production process and testing
Manufacturing process
Spiral forming: using hot-rolled steel strip spiral winding, double-sided submerged arc welding (SAW) process, with uniform weld seam.
Welding control: Stress relief is required after welding to avoid the occurrence of cold cracks.
Quality Control and Testing
Non destructive testing: The weld seam requires 100% ultrasonic (UT) or X-ray sampling inspection, in accordance with ASTM A435 standard.
Dimensional tolerance: The allowable deviation for outer diameter is ± 0.75%, and the deviation for wall thickness is -5% to+10%.
4、 Product specifications and certification
Typical specifications:
Outer diameter range: Φ 219- Φ 3620 mm.
Wall thickness range: 8-50 mm (common wall thickness 10-25 mm).
Certification documents: Material certificates (including chemical composition and mechanical performance data) and NDT reports that comply with ASTM A671 must be provided before leaving the factory.
5、 Application Fields and Selection Suggestions
Key areas:
Chemical equipment (such as reactors, heat exchanger pipelines).
Supporting pipelines for electric boilers (to match medium temperature and pressure).
Low to medium temperature oil and gas gathering and transportation pipelines (non high pressure scenarios).
Selection precautions: It is necessary to clarify the operating temperature, corrosiveness of the medium, and whether additional requirements for low-temperature impact are required.
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