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A515/A515M Gr65
keyword A515/A515M Gr65 Category Steel pipe material Related products Get a quoteA515/A515M Gr65 spiral steel pipe
1、 Material characteristics
Chemical composition
Carbon (C): ≤ 0.28% (control carbon equivalent to optimize weldability).
Manganese (Mn): 0.98%~1.46% (improves thermal processing performance and toughness).
Phosphorus (P) and sulfur (S): both ≤ 0.035% (reducing the risk of hot cracking).
Silicon (Si): 0.13%~0.45% (enhanced deoxidation ability).
Mechanical properties
Tensile strength: ≥ 450MPa (some specifications can reach 550-720MPa).
Yield strength: ≥ 240MPa (higher when thickness ≤ 50mm).
Elongation rate: ≥ 19% (gauge length 200mm) or ≥ 23% (gauge length 50mm).
Thickness directional performance: Supports Z15/Z25/Z35 levels (cross-sectional shrinkage rate ≥ 15%~35%).
Processing performance
Weldability: Suitable for submerged arc welding (SAW) and high-frequency resistance welding (ERW), requiring the use of low hydrogen welding materials (such as H08MnA) and controlled preheating temperature (100-150 ℃).
Delivery status: Normally delivered in rolled or normalized state, with a thickness greater than 50mm requiring mandatory normalizing.
2、 Key points of spiral steel pipe production process
Raw material pretreatment
Steel plate thickness range: 6-120mm (regular stock 10-100mm), width 1800-2650mm.
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): Low hydrogen welding wire is used, with a heat input of ≤ 45kJ/cm, and thick plates (>20mm) 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.
3、 Application scenarios and limitations
Applicable fields
Energy transmission: medium and high pressure oil and gas pipelines (design pressure ≤ 6.4MPa).
Chemical equipment: supporting pipelines for high-temperature pressure vessels (such as reactors and heat exchangers).
Power plant engineering: high-temperature and pressure bearing components such as boiler steam drums and high-pressure water pipes.
Usage restrictions
Temperature range: Recommended -20 ° C~400 ° C, creep strength needs to be evaluated in high temperature environments.
Medium limitation: Not applicable to highly corrosive media (H ₂ S concentration>20ppm), additional anti-corrosion treatment is required.
4、 Execution standards and suppliers
Core standards
Material standards: ASME A515/A515M or ASTM A515/A515M.
Steel pipe standards: API 5L (line pipe), GB/T 9711 (oil and gas transmission pipe).
Supplier Services
By strictly following standard specifications and optimizing production processes, A515/A515M Gr65 spiral steel pipes can meet the needs of medium and high pressure energy transmission and high-temperature industrial scenarios, with a focus on weld quality and material homogeneity.
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
