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N08026 Nickel Alloy Tube
N08026 is a nickel-iron-chromium-molybdenum-copper alloy designed for exceptional corrosion resistance in harsh environments, particularly against sulfuric acid, phosphoric acid, and chloride-containing media. Its key features include:
- High corrosion resistance: Resistant to pitting, crevice corrosion, and stress corrosion cracking (SCC).
- Excellent weldability: Suitable for TIG, MIG, and resistance welding with minimal post-weld heat treatment.
- Thermal stability: Maintains mechanical properties at temperatures up to 990°C.
Chemical Composition (wt%)
|
Element |
Content Range |
|
Ni |
33.00–37.20 |
|
Fe |
24.40–37.90 |
|
Cr |
22.00–26.00 |
|
Mo |
5.00–6.70 |
|
Cu |
2.00–4.00 |
|
C |
≤0.030 |
|
Mn |
≤0.10 |
|
Si |
≤0.50 |
|
N |
0.10–0.16 |
|
P, S |
≤0.030 each |
Parameter | Value/Range |
Dimensions | OD: 3–219 mm, WT: 0.5–35 mm |
Density | 8.2 g/cm³ |
Tensile Strength | ≥620 MPa |
Yield Strength | ≥270 MPa |
Hardness (HB) | 120–180 |
I.N08026 alloy pipe is a high-performance nickel-based alloy with the following notable properties:
1. Excellent Corrosion Resistance: It performs exceptionally well in oxidizing and moderately reducing environments, resisting corrosion from a wide range of chemical media and is particularly suitable for harsh environments containing chloride ions and hydrogen sulfide.
2. High-Temperature Stability: It maintains stable mechanical properties at high temperatures (annealing temperature range of 1121-1204°C), with outstanding high-temperature strength and heat resistance.
3. Good Processability: It is easy to weld and form, and its internal structure can be further optimized through processes such as forging and heat treatment.
4. Excellent Mechanical Properties: It combines high strength and toughness, making it suitable for long-term use under high-pressure and high-stress conditions.
II. N08026 alloy pipe is widely used in the following applications:
1. Chemical Equipment: It is used in the manufacture of reactors, pipelines, and other equipment, where its corrosion resistance extends equipment life.
2. Offshore Platforms: It resists seawater corrosion and high-temperature environments and is suitable for oil and gas production equipment.
3. Energy and Power: Used in boilers, heat exchangers, and condensers, its high-temperature stability ensures system safety.
4. Food Processing: Excellent hygienic performance meets food safety standards.
5. Aerospace: Corrosion resistance and high-temperature performance meet special requirements in extreme environments.
Surface Treatment
- Pickling: Removes oxide layers post-processing.
- Passivation: Enhances corrosion resistance via nitric acid treatment.
- Polishing: Available in BA, No.4, or mirror finishes per ASTM A480.
Why Choose Us ?
- Certified Material: Traceable to ASTM/ASME standards.
- Custom Fabrication: Laser cutting, CNC bending, and welding services.
- Global Supply Chain: Stock availability in North America, Europe & Asia.
Applications & Industries
Oil & Gas Industry:
Used in pipelines and equipment for sour gas (H₂S) environments due to high resistance to stress corrosion cracking.
Chemical Processing:
Suitable for reactors, heat exchangers, and storage tanks handling acidic or oxidizing media.
Marine Engineering:
Applied in seawater systems, condensers, and offshore structures for superior chloride corrosion resistance.
Frequently Asked Questions
Q1: Is N08026 suitable for high-temperature applications?
A1: Yes, with stable properties up to 990°C.
Q2: What welding methods are recommended?
A2: TIG/MIG using ERNiCrMo-3 filler.
Q3: How does N08026 compare to Alloy 20 (N08020)?
- N08026: Higher nickel/molybdenum content for broader acid resistance (including hot sulfuric acid).
- Alloy 20: Optimized for medium-concentration sulfuric acid but less versatile in mixed acids.
Q4: Temperature limits?
- Continuous service: -196°C to 600°C (short-term peak: 650°C).
Q5: How does N08026 perform in corrosive environments?
N08026 exhibits exceptional resistance to:
- Oxidation: Forms a protective oxide layer at high temperatures.
- General Corrosion: Performs well in acidic and alkaline media, including sulfuric and phosphoric acids.
- Pitting and Crevice Corrosion: Molybdenum content enhances resistance to localized attack in chloride solutions.
- Stress Corrosion Cracking: Immune to cracking in chloride and sulfide-containing environments, making it ideal for oil and gas applications.
Q6: What are the applicable standards for N08026 alloy tubes?
N08026 alloy tubes comply with several internationally recognized standards, ensuring quality and performance consistency across applications. Key standards include:
- ASTM B729: Covers seamless nickel and nickel alloy tubes for heat exchangers and condensers, specifying dimensions, tolerances, and testing requirements.
- ASTM B564: Pertains to seamless nickel and nickel alloy pipes, ensuring material composition, mechanical properties, and corrosion resistance meet industry benchmarks.
- ASTM B906: Focuses on wrought nickel and nickel alloy fittings, including tubes, with guidelines for manufacturing and inspection.
- ASME SB729: Aligns with ASTM B729 but is adopted by the American Society of Mechanical Engineers (ASME) for pressure vessel components, ensuring suitability for high-stress environments.
- DIN 17775: German standard for seamless nickel and nickel alloy tubes, emphasizing dimensional accuracy and material purity for European markets.
- EN 10296-1: European standard for seamless nickel and nickel alloy tubes, covering chemical composition, mechanical properties, and testing protocols to ensure compliance with regional safety regulations.
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