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A515/A515M Gr60
keyword A515/A515M Gr60 Category Steel pipe material Related products Get a quoteA515/A515M Gr60 material spiral steel pipe
1、 Material characteristics
Chemical composition
Carbon (C): 0.24%~0.31% (adjusted with thickness), balancing strength and weldability.
Manganese (Mn): 0.70%~1.50%, enhances thermal processing performance and toughness.
Phosphorus (P) and sulfur (S): both ≤ 0.025%~0.035%, reducing the tendency for hot cracking.
Silicon (Si): 0.15%~0.40%, auxiliary deoxidation and strengthening.
Mechanical properties
Tensile strength: 415~550 MPa, meeting the requirements of medium and low pressure bearing.
Yield strength: ≥ 220-275 MPa (different standard requirements).
Elongation rate: ≥ 21%~25% (thickness ≤ 200mm), ensuring forming ductility.
Impact toughness:- 20 ° C low temperature impact value ≥ 27J, suitable for cold environments.
Processing performance
Weldability: Low carbon equivalent (CE ≤ 0.45%), suitable for submerged arc welding (SAW) and high-frequency resistance welding (ERW), requiring the use of low hydrogen welding materials (such as H08MnA).
Delivery status: Regular normalized delivery, improving material homogeneity and processing stability.
2、 Key points of spiral steel pipe production process
Raw material pretreatment
Steel plate thickness range: 8-200mm (regular stock 10-100mm), width can reach 4020mm, suitable for forming large diameter spiral pipes.
Preprocessing process: Leveling, trimming, surface cleaning, rolling accuracy.
Forming and Welding
Spiral winding: forming angle 50 °~75 °, outer diameter range 219~2800mm, weld seam gap control ≤ 3mm.
Double sided submerged arc welding (DSAW): The welding wire is matched with low hydrogen materials (such as H08MnA), with a heat input of ≤ 45 kJ/cm and a preheating temperature of 100-150 ℃ (thick plates need to be preheated).
Quality inspection
Non destructive testing: 100% ultrasonic testing (UT) or X-ray testing (RT), in compliance with ASME/ASTM standards.
Hydrostatic test: pressure ≥ 1.5 times the design pressure, holding time ≥ 10 seconds, pressure bearing sealing performance.
3、 Application scenarios and limitations
Applicable fields
Energy transmission: Medium and low pressure oil and gas pipelines (design pressure ≤ 6.4 MPa).
Chemical equipment: supporting pipelines for pressure vessels such as storage tanks, heat exchangers, and reactors.
Municipal engineering: thermal pipeline network, water pipeline.
Usage restrictions
Temperature range: Recommended -20 ° C~400 ° C, high temperature environment requires evaluation of creep strength attenuation.
Medium limitation: Not suitable for highly corrosive (H ₂ S concentration>20ppm) or acidic environments, additional anti-corrosion treatment is required.
4、 Execution standards and suppliers
Core standards
Material standard: ASTM A515/A515M (American standard).
Steel pipe standards: API 5L (line pipe), GB/T 9711 (oil and gas transmission pipe).
Through material performance adaptation and process control, A515/A515M Gr60 spiral steel pipes can be stably used in medium and low voltage energy and industrial fields, and strict adherence to standards and strengthened weld quality monitoring are required.
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