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A516/A516M Gr65
keyword A516/A516M Gr65 Category Steel pipe material Related products Get a quoteChemical and Performance Analysis of A516/A516M Gr65 Spiral Steel Pipe
1、 Chemical composition
Carbon (C): ≤ 0.29% (optimized weldability and strength balance)
Silicon (Si): 0.15%~0.40% (enhances deoxidation ability and strength)
Manganese (Mn): 0.79%~1.30% (improves thermal processing performance and toughness)
Phosphorus (P) and sulfur (S): both ≤ 0.035% (strictly control harmful elements to reduce crack risk)
2、 Mechanical properties
Tensile strength: 500~650 MPa (meets the strength requirements of medium and high pressure pipelines)
Yield strength: ≥ 350 MPa (up to 355 MPa or more when thickness ≤ 50mm)
Elongation rate: ≥ 20% (gauge length 200mm, ensuring plastic deformation capacity)
Low temperature toughness:- Excellent impact performance at 46 ° C (suitable for cold regions and low-temperature conditions)
Hydrogen Induced Cracking (HIC) Resistance: Special Process Optimization, Suitable for Hydrogen Containing Media Environments
3、 Key performance characteristics
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
Corrosion resistance: Through composition control and surface treatment, it can be stably used in corrosive environments such as acid, alkali, and salt
Applicable scenarios: oil/gas pipelines, chemical pressure vessels (such as storage tanks, reactors), low-temperature thermal pipelines, etc
4、 Execution standards and testing
Core standard: ASTM A516/A516M (American standard pressure vessel steel)
Quality verification: X-ray inspection of welds requires ultrasonic testing (UT), hydrostatic testing (≥ 1.5 times the design pressure), and HIC special testing
Through strict composition control and standardized processes, A516/A516M Gr65 spiral steel pipes possess high strength, low temperature toughness, and corrosion resistance, making them suitable for medium and high pressure energy transmission and industrial equipment in complex working conditions.
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