I. Nickel 200 Seamless Tube Product Overview
Nickel 200 seamless tubes are single-phase nickel alloy pipes manufactured from high-purity nickel (≥99.6% Ni) via seamless extrusion or hot-rolling processes.
These tubes exhibit outstanding corrosion resistance, high-temperature performance, and excellent toughness, enabling long-term operation in diverse demanding industrial environments.
Key Features
- High Corrosion Resistance
Demonstrates exceptional resistance to various acids (e.g., nitric acid, hydrochloric acid), alkalis, and seawater environments. - High-Temperature Performance
Capable of sustained operation at elevated temperatures, suitable for heat exchangers, steam pipelines, and similar applications. - Superior Mechanical Properties
Offers excellent toughness and weldability, facilitating on-site fabrication and installation. - Seamless Construction
Provides enhanced pressure-bearing capacity and reliability, making it preferable to welded pipes for high-pressure and high-temperature applications. - Wide Range of Applications
Used in chemical processing equipment, seawater treatment and marine engineering, aerospace, electronics manufacturing, food processing, and other industries.
II. Standards for Nickel 200 Seamless Tubes
| Standard System | Standard No. / Description | Scope / Application |
|---|---|---|
| ASTM / ASME | ASTM B162 – Seamless Nickel Pipe | Chemical processing, seawater service, and corrosion-resistant piping |
| ASTM / ASME | ASTM B165 – Seamless Nickel Pipe | High-temperature steam piping and industrial equipment |
| UNS | N02200 – Unified Numbering System | Corresponds to Nickel 200 material |
| ISO | ISO 11949 – Seamless Nickel Pipe | International standard for industrial piping |
| GB/T (China) | GB/T 2895 – Seamless Nickel and Nickel Alloy Pipes | Domestic industrial piping applications |
III. High-Temperature Performance and Corrosion Resistance of Nickel 200 Seamless Steel Pipe
High-Temperature Performance
- Long-Term Service Temperature
Can be used long-term in environments below 500°C while maintaining stable strength and toughness. - Suitable for High-Temperature Steam and Thermal Media
Ideal for steam pipelines, heat exchangers, and high-temperature industrial piping systems, with excellent oxidation resistance. - Thermal Expansion Characteristics
The pipe exhibits a uniform thermal expansion coefficient, making it suitable for high-temperature continuous operation systems. Expansion space and proper support must be provided.
Corrosion Resistance Properties
- Superior Chemical Stability
Demonstrates exceptional corrosion resistance against nitric acid, hydrochloric acid, hydrofluoric acid, sodium hydroxide, seawater, and various corrosive media. - Resistance to Pitting and Crevice Corrosion
Can be used long-term in chlorine-containing environments or chemical media without susceptibility to pitting or crevice corrosion. - Resistance to Stress Corrosion Cracking
High-purity nickel material and seamless construction minimize stress concentration, making it suitable for high-temperature, high-pressure corrosive environments. - Enhanced Performance Through Surface Treatment
Corrosion resistance can be further enhanced and service life extended through acid pickling, polishing, or passivation.
IV. Chemical Composition and Mechanical Properties of Nickel 200 Seamless Steel Pipes
i. Chemical Composition of Nickel 200 Seamless Steel Pipes
| Element | Content (%) | Description |
|---|---|---|
| Ni | ≥ 99.6 | High-purity nickel ensures excellent corrosion resistance |
| C | ≤ 0.03 | Carbon content controlled to prevent intergranular corrosion |
| Fe | ≤ 0.35 | Impurity content controlled |
| Mn | ≤ 0.35 | Impurity content controlled |
| Si | ≤ 0.08 | Impurity content controlled |
| Cu | ≤ 0.25 | Trace element; not essential but may be present |
ii. Mechanical properties of Nickel 200 seamless steel pipes
| Mechanical Property | Value Range | Description |
|---|---|---|
| Yield Strength (σ₀.₂) | ≥ 130 MPa | Ensures pressure-bearing capacity of the pipe |
| Tensile Strength (σb) | 275 – 415 MPa | Ensures structural integrity |
| Elongation (δ5) | ≥ 30 % | Provides good toughness and formability |
| Hardness | ≤ 95 HB | Facilitates welding and machining |
| Impact Toughness | ≥ 50 J (Room Temperature) | Suitable for impact loads in industrial environments |
V. Specifications and models of Nickel 200 seamless steel pipes
| Outside Diameter (mm) | Wall Thickness (mm) | Length (m) | Theoretical Weight (kg/m) | Remarks |
|---|---|---|---|---|
| 6 | 1 – 2 | 6 / 12 | 0.15 – 0.25 | Small diameter pipe |
| 12 | 1.5 – 3 | 6 / 12 | 0.45 – 0.95 | Standard industrial pipe |
| 25 | 2 – 4 | 6 / 12 | 1.2 – 2.3 | Commonly used size |
| 50 | 3 – 6 | 6 / 12 | 5.0 – 9.8 | Medium diameter pipe |
| 76 | 4 – 8 | 6 / 12 | 10 – 20 | Industrial pipe |
| 101 | 6 – 12 | 6 / 12 | 18 – 40 | High-pressure pipe |
| 168 | 8 – 16 | 6 / 12 | 55 – 115 | Large diameter industrial pipe |
| 219 | 12 – 25 | 6 / 12 | 100 – 250 | Extra-large diameter pipe |
VI. Inspection and Acceptance Standards for Nickel 200 Seamless Steel Pipes
| Inspection Item | Test Method / Standard | Requirement / Reference Value | Description |
|---|---|---|---|
| Chemical Composition | Optical Emission Spectroscopy (OES / Spectrometer) | Ni ≥ 99.6%, C ≤ 0.03%, Fe ≤ 0.35%, Mn ≤ 0.35%, Si ≤ 0.08% | Ensures corrosion resistance and mechanical properties |
| Yield Strength (σ₀.₂) | Tensile Test ASTM E8 / ISO 6892 | ≥ 130 MPa | Ensures pressure-bearing capacity of the pipe |
| Tensile Strength (σb) | Tensile Test ASTM E8 / ISO 6892 | 275 – 415 MPa | Ensures structural integrity |
| Elongation (δ5) | Tensile Test ASTM E8 / ISO 6892 | ≥ 30% | Ensures ductility and toughness |
| Hardness | Rockwell / Brinell Hardness Test ASTM E18 / ASTM E10 | ≤ 95 HB | Suitable for welding and machining |
| Pressure Test | Hydrostatic or Pneumatic Test ASTM B162 / ASTM B165 | ≥ 1.5 × Design Pressure | Verifies pressure resistance |
| Non-Destructive Testing (NDT) | Ultrasonic Testing or Radiographic Testing ASTM A435 | No cracks or weld defects | Ensures pipe integrity |
| Dimensional Accuracy | Vernier Caliper, Thickness Gauge, Measuring Tape | OD, WT, tolerances per ASTM / GB/T standards | Ensures installation accuracy |
| Surface Quality | Visual Inspection or Magnetic Particle Testing ASTM A480 | No visible cracks, pits, scratches, or slag | Ensures corrosion resistance and appearance |
| Packaging Inspection | Visual Inspection | Proper wooden packing and end protection | Ensures transportation safety |
VII. Packaging and Transportation of Nickel 200 Seamless Steel Pipes
i. Packaging Methods
- End Protection
Pipe ends are sealed with paper tubes or plastic plugs to prevent damage and contamination. - Bundling Methods
Small-diameter pipes: Bundled with steel strapping, wrapped in plastic film or waterproof cloth.
Large-diameter pipes: Secured in wooden crates or on pallets with spacers (wood or plastic) between pipes to prevent impact. - Surface Protection
May be coated with rust-preventive oil or film to prevent surface oxidation or scratches during transport.
ii. Transportation Methods
- Land Transport
Use flatbed or low-bed trailers with pipes securely fastened to prevent rolling or collision.
Ensure waterproofing and moisture protection in high-temperature or humid environments. - Sea Freight
For bulk exports, use wooden crates or steel pallets with secure lashing and waterproof/moisture-proof packaging.
Prevent crushing and impact during port handling. - Special Transport Requirements
Long or extra-long pipes require specialized supports and anti-bending measures.
Use protective sleeves or internal supports for easily bent or precision pipes.
iii. Storage Precautions
- Store in dry, well-ventilated areas, avoiding direct contact with corrosive substances.
- Whether stacked vertically or horizontally, prevent excessive stress on pipe ends.
- Avoid prolonged stacking pressure; periodically inspect rust-preventive oil and protective measures.
