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01
ASTM B407-21 Standard Specification for Nickel-Iron-Chromium Alloy Seamless Pipe and Tube
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).
Material Codes (UNS Alloys)
UNS Alloy Designations in ASTM B407-21
● N08120
- Common Name: None (proprietary alloy)
- Key Features: High chromium (25%) and nickel (37%) with niobium (Nb) addition for sulfidation resistance.
● N08800
- Common Name: Incoloy® 800
- Key Features: General-purpose alloy with balanced Ni-Fe-Cr composition for oxidation resistance.
● N08810
- Common Name: Incoloy® 800H
- Key Features: Higher carbon (0.05–0.10%) than N08800 for improved high-temperature strength.
● N08811
- Common Name: Incoloy® 800HT
- Key Features: Controlled Ti/Al (≥0.85%) for superior creep rupture strength.
● N08890
- Common Name: Incoloy® 800AT
- Key Features: Low titanium (Ti ≤ 0.03%) for enhanced weldability.
● 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.
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%).
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 |
Heat Treatment
- Solution Annealing: Mandatory for all alloys (e.g., N08800 at 1100–1200°C, rapid cooling).
- Stress Relieving: Optional for cold-worked tubes.
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).
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.
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.
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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