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Yancheng Black Seamless Pipe
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Name: Yancheng Black Seamless Pipe
Standard: ASME
Type: Seamless
Material: A335 P22
Size: 1/8 to 48 inch
Schedule: SCH40
Surface of Pipe: Black
Application: Used for the Transportation of Gas, Water, Oil and other media in industries.
Standard: ASME
Type: Seamless
Material: A335 P22
Size: 1/8 to 48 inch
Schedule: SCH40
Surface of Pipe: Black
Application: Used for the Transportation of Gas, Water, Oil and other media in industries.
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Black Seamless Pipe is an ASME-compliant high-performance seamless pipeline product manufactured from A335 P22 alloy steel. Available in sizes ranging from 1/8 inch to 48 inches with standard SCH40 wall thickness, this Black Seamless Pipe features specialized black paint coating, making it ideal for high-pressure transportation of petroleum, natural gas, water, and other industrial media.
Core Characteristics of Black Seamless Pipe - High-Temperature Pressure Resistance of A335 P22 Seamless Steel Pipe
1. Material Composition and High-Temperature Performance Relationship
Black Seamless Pipe utilizes A335 P22 seamless steel pipe with an optimized alloy formula containing 2.25% chromium (Cr) and 1% molybdenum (Mo), enabling exceptional mechanical properties at temperatures up to 540°C (1000°F). The high-temperature stability of Black Seamless Pipe relies on these key mechanisms:
Black Seamless Pipe utilizes A335 P22 seamless steel pipe with an optimized alloy formula containing 2.25% chromium (Cr) and 1% molybdenum (Mo), enabling exceptional mechanical properties at temperatures up to 540°C (1000°F). The high-temperature stability of Black Seamless Pipe relies on these key mechanisms:
- Role of Chromium (Cr):
- Forms a stable Cr₂O₃ protective layer on the Black Seamless Pipe surface, significantly enhancing oxidation resistance
- Improves creep resistance, reducing deformation rates under prolonged stress
- Effectively inhibits sulfide stress corrosion cracking (SSCC) in H₂S environments
- Forms a stable Cr₂O₃ protective layer on the Black Seamless Pipe surface, significantly enhancing oxidation resistance
- Improves creep resistance, reducing deformation rates under prolonged stress
- Effectively inhibits sulfide stress corrosion cracking (SSCC) in H₂S environments
- Contribution of Molybdenum (Mo):
- Enhances high-temperature strength, particularly creep resistance
- Prevents carbide precipitation, avoiding material embrittlement during long-term high-temperature service
- Works synergistically with chromium to optimize grain boundary stability and resist intergranular corrosion
- Enhances high-temperature strength, particularly creep resistance
- Prevents carbide precipitation, avoiding material embrittlement during long-term high-temperature service
- Works synergistically with chromium to optimize grain boundary stability and resist intergranular corrosion
2. Creep Resistance Analysis
Under high-temperature and high-pressure conditions, Black Seamless Pipe demonstrates outstanding creep resistance due to its specialized Cr-Mo alloy composition:
Under high-temperature and high-pressure conditions, Black Seamless Pipe demonstrates outstanding creep resistance due to its specialized Cr-Mo alloy composition:
- Exceptional Creep Limit Performance:
- At 540°C and 100MPa stress, creep rate remains below 1×10⁻⁵%/h
- Maintains ≥15% fracture elongation after 100,000 hours of service
- At 540°C and 100MPa stress, creep rate remains below 1×10⁻⁵%/h
- Maintains ≥15% fracture elongation after 100,000 hours of service
- Stable Microstructure:
- Normalizing and tempering (N&T) heat treatment produces uniform ferrite + pearlite structure
- Molybdenum effectively suppresses σ-phase (FeCr) formation, ensuring long-term toughness
- Normalizing and tempering (N&T) heat treatment produces uniform ferrite + pearlite structure
- Molybdenum effectively suppresses σ-phase (FeCr) formation, ensuring long-term toughness
3. Oxidation Resistance Performance
Black Seamless Pipe excels in high-temperature oxidative environments:
Black Seamless Pipe excels in high-temperature oxidative environments:
- Superior Oxidation Kinetics:
- Oxidation rate of only 0.1~0.3 mg/cm²·h in 540°C air/steam environments
- Cr₂O₃ layer effectively blocks oxygen diffusion, extending service life
- Oxidation rate of only 0.1~0.3 mg/cm²·h in 540°C air/steam environments
- Cr₂O₃ layer effectively blocks oxygen diffusion, extending service life
- Excellent Steam Oxidation Resistance:
- Withstands 10MPa high-pressure steam environments
- Completely eliminates hydrogen embrittlement (H₂) failure risks
- Withstands 10MPa high-pressure steam environments
- Completely eliminates hydrogen embrittlement (H₂) failure risks
4. Typical High-Temperature Applications
Leveraging these exceptional properties, Black Seamless Pipe is widely used in:
Leveraging these exceptional properties, Black Seamless Pipe is widely used in:
- Power Plant Boiler Systems:
- Superheater/reheater piping operating reliably for 100,000+ hours at 400~540°C and 10~25MPa
- Superheater/reheater piping operating reliably for 100,000+ hours at 400~540°C and 10~25MPa
- Petrochemical Equipment:
- Ideal for hydrogenation reactors facing combined H₂S + high-temperature (≤550°C) challenges
- Ideal for hydrogenation reactors facing combined H₂S + high-temperature (≤550°C) challenges
- New Energy Sectors:
- Preferred choice for geothermal/nuclear systems transporting saturated steam (300~450°C)
- Preferred choice for geothermal/nuclear systems transporting saturated steam (300~450°C)
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