ASTM B407-21 Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube

 1. Scope  

- Covers seamless pipe and tube made of nickel-iron-chromium alloys (UNS N08120, N08800, N08810, N08811, N08890, N08140).  

- Designed for high-temperature and corrosive service (e.g., heat exchangers, furnace components, chemical processing).  

 2. Ordering Information  

Buyers must specify:  

- ASTM B407-21 and alloy UNS number (e.g., N08800).  

- Dimensions (OD, wall thickness, length).  

- Condition (hot-finished, cold-worked, annealed).  

- Surface finish (e.g., pickled, polished).  

- Testing requirements (hydrostatic, NDE, corrosion tests).  

- Certification (EN 10204 3.1/3.2 or equivalent).  

- Additional requirements (e.g., grain size, special tolerances).  

 3. Material Codes (UNS Alloys)  

 UNS Alloy Designations in ASTM B407-21  

l N08120  

   - Common Name: None (proprietary alloy)  

   - Key Features: High chromium (25%) and nickel (37%) with niobium (Nb) addition for sulfidation resistance.  

l N08800  

   - Common Name: Incoloy® 800  

   - Key Features: General-purpose alloy with balanced Ni-Fe-Cr composition for oxidation resistance.  

l N08810  

   - Common Name: Incoloy® 800H  

   - Key Features: Higher carbon (0.05–0.10%) than N08800 for improved high-temperature strength.  

l N08811  

   - Common Name: Incoloy® 800HT  

   - Key Features: Controlled Ti/Al (≥0.85%) for superior creep rupture strength.  

l N08890  

   - Common Name: Incoloy® 800AT  

   - Key Features: Low titanium (Ti ≤ 0.03%) for enhanced weldability.  

l N08140  

   - Common Name: None (specialized alloy)  

   - Key Features: Modified Ni-Fe-Cr with improved corrosion resistance in aggressive environments.  

 Notes  

- N08800, N08810, and N08811 are the most widely used grades, especially in high-temperature applications.  

- N08120 and N08140 are niche alloys for extreme corrosion resistance.  

 4. Chemical Composition  

- Strict elemental limits (e.g., N08800: Ni 30–35%, Cr 19–23%, Fe ≥ 39.5%).  

- Impurity control: Low sulfur (≤0.015%) and phosphorus (≤0.025%).  

 5. Mechanical Properties  

| Alloy | Condition | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |  

| N08800 | Annealed | ≥485 | ≥170 | ≥30 |  

| N08810 | Annealed | ≥450 | ≥170 | ≥30 |  

| N08811 | Annealed | ≥450 | ≥170 | ≥30 |  

 6. Heat Treatment  

- Solution Annealing: Mandatory for all alloys (e.g., N08800 at 1100–1200°C, rapid cooling).  

- Stress Relieving: Optional for cold-worked tubes.  

 7. Inspection & Testing Requirements  

- Chemical Analysis: Per ASTM E354 (wet) or E1473 (OES).  

- Tensile Testing: Per ASTM E8/E8M (one test per lot).  

- Hydrostatic Testing: Optional (per ASTM B829).  

- NDE: Eddy current (ASTM E426) or ultrasonic (ASTM E213) if specified.  

- Corrosion Testing: Optional (e.g., ASTM G28 for intergranular corrosion).  

 8. Surface & Dimensional Requirements  

- Surface: Free of cracks, scale, or pits; minor scratches allowed.  

- Tolerances:  

  - OD: ±0.8% for hot-finished, ±0.4% for cold-worked.  

  - Wall Thickness: ±10% for pipes, ±5% for tubes.  

 9. Certification & Marking  

- MTR (Material Test Report): Includes heat analysis, mechanical tests, and compliance.  

- Marking: Alloy UNS (e.g., "N08800"), ASTM B407-21, heat number, size, and manufacturer’s logo.  

 10. Key Applications  

- Heat exchangers, boilers, furnace tubing (N08800/N08810).  

- Chemical processing (N08120 for sulfuric acid environments).  

- Nuclear/power plants (N08811 for creep resistance).  

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