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ASTM A671 CC70
keyword ASTM A671 CC70 Category Steel pipe material Related products Get a quoteASTM A671 CC70 Material Spiral Steel Pipe Technical Specification and Application
1、 Standard and Level Definition
Execution standard: ASTM A671 is an electric fusion welding (EFW) steel pipe standard, suitable for medium and low temperature (-29 ℃~+343 ℃) high-pressure pipeline systems. CC70 is a carbon manganese steel grade with a small yield strength of 70 ksi (approximately 483 MPa).
Grade characteristics:
CC "represents carbon manganese steel material, and CL22/CL32 represents supplementary requirement levels (such as low-temperature impact testing or non-destructive testing standards).
Suitable for spiral submerged arc welding (SAW) forming process, with an outer diameter range of Φ 219.1- Φ 3620mm (8-142.5 inches) and a wall thickness of 7.92-50.8 mm (0.312-2 inches).
2、 Chemical composition and mechanical properties
Chemical composition
Basic elements: carbon (C) ≤ 0.30%, manganese (Mn) 0.60-1.35%, sulfur (S) ≤ 0.035%, phosphorus (P) ≤ 0.035%. Low sulfur phosphorus design improves low-temperature toughness and welding performance.
Alloy control: Based on the ASTM A516 Gr70 steel plate standard, optimize the alloy ratio to balance strength and workability.
Mechanical performance
Yield strength: ≥ 483 MPa (70 ksi).
Tensile strength: ≥ 483-621 MPa (70-90 ksi), depending on the heat treatment process.
Low temperature toughness: optional -46 ℃ impact test (CL22/CL32 supplementary requirements need to be specified).
3、 Production process and testing requirements
Manufacturing process
Spiral forming: using hot-rolled steel strip spiral winding, double-sided submerged arc welding (SAW) forming, with uniform weld seam and high density.
Post weld treatment: Stress relief heat treatment (such as normalizing or tempering) is required to enhance crack resistance.
Quality inspection
Non destructive testing: The weld seam requires 100% ultrasonic testing (UT) or X-ray sampling, in accordance with ASTM A435 standard.
Dimensional tolerance: Outer diameter error ≤ ± 0.75%, wall thickness deviation -5%~+10%.
4、 Application Fields and Typical Specifications
Core scenario:
Oil and natural gas: high-pressure oil and gas transmission pipelines, gathering and transportation systems (including low-temperature environments).
Electricity and nuclear power: boiler high-pressure pipelines, auxiliary systems of nuclear power plants (such as heat exchangers, reactor pipelines).
Chemical equipment: pressure resistant vessels, reaction kettle supporting pipelines (applicable temperature ≤ 343 ℃).
5、 Selection and Certification Suggestions
Certification documents: ASTM standard material certificate (including chemical composition and mechanical property data) and non-destructive testing report are required.
Selection precautions:
Low temperature environment (≤ -46 ℃) requires clear CL22/CL32 level supplementary impact test requirements.
It is recommended to add external anti-corrosion coatings (such as 3PE, epoxy resin) or lining materials for high corrosion scenarios.
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