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Carbon Steel Welded Pipe
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Name: Carbon Steel Welded Pipe Fujian
Standard: ASME B36.10M
Type: Welded
Material: Carbon Steel
Size: 1/8 to 48 inch
Wall Thickness: SCH40
Application: Used for Petroleum and Natural Gas Industry
Standard: ASME B36.10M
Type: Welded
Material: Carbon Steel
Size: 1/8 to 48 inch
Wall Thickness: SCH40
Application: Used for Petroleum and Natural Gas Industry
Quantity
Carbon Steel Welded Pipe is manufactured using premium carbon steel materials, combining high strength with excellent pressure resistance. Available in a comprehensive size range from 1/8 to 48 inches, it strictly complies with international standards while demonstrating outstanding reliability and durability under demanding operating conditions. With precision welding processes and SCH40 wall thickness, Carbon Steel Welded Pipe provides superior structural support, making it ideal for critical applications in transmission pipelines, industrial facilities, and energy infrastructure - representing an efficient and economical engineering solution.
Weld quality is the decisive factor determining the performance of Carbon Steel Welded Pipe. To ensure its strength, sealing integrity, and durability, rigorous quality control is implemented through non-destructive testing (NDT) and heat treatment processes.
1. Weld Non-Destructive Testing (NDT)
(1) Ultrasonic Testing (UT)
- Principle: Utilizes high-frequency sound waves (2-10 MHz) to detect internal defects in Carbon Steel Welded Pipe welds (porosity, slag inclusions, lack of fusion) through echo reflection.
(1) Ultrasonic Testing (UT)
- Principle: Utilizes high-frequency sound waves (2-10 MHz) to detect internal defects in Carbon Steel Welded Pipe welds (porosity, slag inclusions, lack of fusion) through echo reflection.
- Testing Standards: Complies with ASTM E317 (Ultrasonic Testing Standard) or API 5L (Petroleum Pipeline Specification).
- Technical Parameters:
- Probe frequency: 5 MHz (for Carbon Steel Welded Pipe ≤20mm wall thickness); 2.25 MHz (>20mm).
- Sensitivity: Capable of detecting ≥0.5mm defects (cracks, inclusions).
- Testing speed: Synchronized with production line (up to 30 m/min with automated UT equipment).
- Technical Parameters:
- Probe frequency: 5 MHz (for Carbon Steel Welded Pipe ≤20mm wall thickness); 2.25 MHz (>20mm).
- Sensitivity: Capable of detecting ≥0.5mm defects (cracks, inclusions).
- Testing speed: Synchronized with production line (up to 30 m/min with automated UT equipment).
- Advantages:
- Detects subsurface defects in Carbon Steel Welded Pipe (internal cracks), whereas X-ray only identifies surface defects.
- Real-time feedback with automatic marking system for immediate defect localization.
- Detects subsurface defects in Carbon Steel Welded Pipe (internal cracks), whereas X-ray only identifies surface defects.
- Real-time feedback with automatic marking system for immediate defect localization.
(2) Eddy Current Testing (ET)
- Principle: Detects surface and near-surface weld defects (cracks, voids) in Carbon Steel Welded Pipe through electromagnetic induction.
- Testing Standard: Follows ASTM E309 (Eddy Current Testing Standard).
- Principle: Detects surface and near-surface weld defects (cracks, voids) in Carbon Steel Welded Pipe through electromagnetic induction.
- Testing Standard: Follows ASTM E309 (Eddy Current Testing Standard).
- Technical Parameters:
- Frequency range: 1-100 kHz (low frequency for deep defects, high frequency for surface defects).
- Applicable thickness: ≤6mm (high-frequency ET); >6mm requires combined UT application.
- Detection accuracy: Identifies surface cracks ≥0.3mm.
- Frequency range: 1-100 kHz (low frequency for deep defects, high frequency for surface defects).
- Applicable thickness: ≤6mm (high-frequency ET); >6mm requires combined UT application.
- Detection accuracy: Identifies surface cracks ≥0.3mm.
- Advantages:
- Non-contact method suitable for high-speed production (up to 50 m/min).
- Insensitive to surface oxidation, directly applicable to galvanized/painted Carbon Steel Welded Pipe.
- Non-contact method suitable for high-speed production (up to 50 m/min).
- Insensitive to surface oxidation, directly applicable to galvanized/painted Carbon Steel Welded Pipe.
(3) Supplementary Testing (Optional)
- Radiographic Testing (RT): Suitable for thick-walled Carbon Steel Welded Pipe (>20mm), detects 3D defects (higher cost, slower offline process).
- Magnetic Particle Testing (MT): Only for surface defect detection on ferromagnetic materials (0.1mm sensitivity).
- Radiographic Testing (RT): Suitable for thick-walled Carbon Steel Welded Pipe (>20mm), detects 3D defects (higher cost, slower offline process).
- Magnetic Particle Testing (MT): Only for surface defect detection on ferromagnetic materials (0.1mm sensitivity).
2. Weld Heat Treatment Processes
Residual stresses and Heat-Affected Zone (HAZ) hardening during welding may reduce Carbon Steel Welded Pipe toughness, requiring heat treatment to optimize microstructure.
Residual stresses and Heat-Affected Zone (HAZ) hardening during welding may reduce Carbon Steel Welded Pipe toughness, requiring heat treatment to optimize microstructure.
(1) Normalizing
- Temperature range: 900-950°C (e.g. A106 Gr.B at 920°C).
- Soaking time: 1 hour per 25mm wall thickness (30-60 minutes for SCH40 Carbon Steel Welded Pipe).
- Cooling method: Air cooling (ambient still air).
- Temperature range: 900-950°C (e.g. A106 Gr.B at 920°C).
- Soaking time: 1 hour per 25mm wall thickness (30-60 minutes for SCH40 Carbon Steel Welded Pipe).
- Cooling method: Air cooling (ambient still air).
- Benefits:
- Grain refinement improves Carbon Steel Welded Pipe impact toughness (Charpy V-notch ≥27J per ASTM A370).
- Homogenizes mechanical properties between weld and base metal (≤5% tensile strength variation).
- Grain refinement improves Carbon Steel Welded Pipe impact toughness (Charpy V-notch ≥27J per ASTM A370).
- Homogenizes mechanical properties between weld and base metal (≤5% tensile strength variation).
(2) Annealing
- Temperature range: 650-700°C (full annealing) or 500-600°C (stress relief).
- Soaking time: 1.5 hours per 25mm (2 hours for 6"SCH40 Carbon Steel Welded Pipe).
- Cooling method: Furnace cooling (≤50°C/h) to 300°C then air cooling.
- Benefits:
- Eliminates welding residual stresses (≥80% stress reduction).
- Reduces HAZ hardness (from 250 HB to <180 HB), enhancing machinability.
- Temperature range: 650-700°C (full annealing) or 500-600°C (stress relief).
- Soaking time: 1.5 hours per 25mm (2 hours for 6"SCH40 Carbon Steel Welded Pipe).
- Cooling method: Furnace cooling (≤50°C/h) to 300°C then air cooling.
- Benefits:
- Eliminates welding residual stresses (≥80% stress reduction).
- Reduces HAZ hardness (from 250 HB to <180 HB), enhancing machinability.
(3) Localized Heat Treatment (Special Applications)
- Induction heating: Weld zone only (600-700°C), energy-efficient (3-5 m/min processing speed).
- Induction heating: Weld zone only (600-700°C), energy-efficient (3-5 m/min processing speed).
- Data:
- Reduces yield strength variation in Carbon Steel Welded Pipe by 10% (e.g. API 5L Gr.B: 345-450 MPa → 360-420 MPa).
- Transforms microstructure from martensite to ferrite+pearlite, improving corrosion resistance (+50% salt spray test lifespan).
- Reduces yield strength variation in Carbon Steel Welded Pipe by 10% (e.g. API 5L Gr.B: 345-450 MPa → 360-420 MPa).
- Transforms microstructure from martensite to ferrite+pearlite, improving corrosion resistance (+50% salt spray test lifespan).
Carbon Steel Welded Pipe achieves quality assurance through:
1. Zero-defect delivery: Compliance with ASME B31.3 and API 5L stringent requirements.
2. Performance uniformity: ≤5% mechanical property variation between weld/base metal.
3. Efficient control: Automated systems support mass production (e.g. 100,000 tons/year).
1. Zero-defect delivery: Compliance with ASME B31.3 and API 5L stringent requirements.
2. Performance uniformity: ≤5% mechanical property variation between weld/base metal.
3. Efficient control: Automated systems support mass production (e.g. 100,000 tons/year).
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