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0102030405
Seamless Nickel-Iron-Chromium Alloy Pipe and Tube from China Suppliers and Factory for High-Temperature Applications
Ordering Information
Buyers must specify the following when placing an order:
- 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)
High chromium (25%) and nickel (37%) with niobium (Nb) addition for sulfidation resistance.
● N08800
Common Name: Incoloy® 800
General-purpose alloy with balanced Ni-Fe-Cr composition for oxidation resistance.
● N08810
Common Name: Incoloy® 800H
Higher carbon (0.05–0.10%) than N08800 for improved high-temperature strength.
● N08811
Common Name: Incoloy® 800HT
Controlled Ti/Al (≥0.85%) for superior creep rupture strength.
● N08890
Common Name: Incoloy® 800AT
Low titanium (Ti ≤ 0.03%) for enhanced weldability.
● N08140
Common Name: None (specialized alloy)
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
⚗️ Elemental Limits
N08800: Ni 30–35%, Cr 19–23%, Fe ≥ 39.5% — strict elemental controls ensure consistent alloy performance.
🧪 Impurity Control
Low sulfur (≤ 0.015%) and phosphorus (≤ 0.025%) to maintain material integrity and corrosion resistance.
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. N08800 is processed at 1100–1200°C followed by rapid cooling to ensure optimal microstructure.
🌡️ Stress Relieving
Optional process applied to cold-worked tubes to reduce residual stresses and improve dimensional stability.
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 Condition
Free of cracks, scale, or pits. Minor scratches are permitted within acceptable limits per ASTM B407-21.
📐 Dimensional Tolerances
• OD: ±0.8% (hot-finished) / ±0.4% (cold-worked)
• Wall Thickness: ±10% (pipes) / ±5% (tubes)
Certification & Marking
📄 MTR (Material Test Report)
Includes heat analysis, mechanical test results, and full compliance documentation per ASTM B407-21.
🏷️ Product Marking
Each product is marked with: Alloy UNS (e.g., "N08800"), ASTM B407-21 reference, heat number, size, and manufacturer's logo.
Key Applications
🔩
Heat Exchangers & Boilers
N08800 / N08810 for furnace tubing and high-temperature service.
N08800 / N08810 for furnace tubing and high-temperature service.
⚗️
Chemical Processing
N08120 for sulfuric acid and aggressive chemical environments.
N08120 for sulfuric acid and aggressive chemical environments.
⚡
Nuclear & Power Plants
N08811 for superior creep resistance in high-temperature power systems.
N08811 for superior creep resistance in high-temperature power systems.
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Frequently Asked Questions (FAQ)
What is ASTM B407-21 and which alloys does it cover?
ASTM B407-21 is the standard specification for nickel-iron-chromium alloy seamless pipe and tube. It covers UNS alloys including N08800 (Incoloy® 800), N08810 (Incoloy® 800H), N08811 (Incoloy® 800HT), N08890, N08120, and N08140, each designed for specific high-temperature and corrosion-resistant applications.
What is the difference between N08800, N08810, and N08811?
N08800 (Incoloy® 800) is a general-purpose alloy for oxidation resistance. N08810 (Incoloy® 800H) has higher carbon content (0.05–0.10%) for improved high-temperature strength. N08811 (Incoloy® 800HT) features controlled Ti/Al (≥0.85%) for superior creep rupture strength, making it ideal for the most demanding elevated-temperature service.
What heat treatment is required for ASTM B407-21 tubes?
Solution annealing is mandatory for all alloys covered under ASTM B407-21. For N08800, this involves heating to 1100–1200°C followed by rapid cooling. Stress relieving is an optional process that may be applied to cold-worked tubes to reduce residual stresses.
What testing and inspection methods are required under ASTM B407-21?
Required testing includes chemical analysis (ASTM E354 or E1473) and tensile testing (ASTM E8/E8M, one test per lot). Optional tests include hydrostatic testing (ASTM B829), non-destructive examination such as eddy current (ASTM E426) or ultrasonic testing (ASTM E213), and corrosion testing per ASTM G28.
What dimensional tolerances apply to ASTM B407-21 pipe and tube?
For outer diameter (OD), the tolerance is ±0.8% for hot-finished and ±0.4% for cold-worked products. Wall thickness tolerances are ±10% for pipes and ±5% for tubes. All surfaces must be free of cracks, scale, and pits, with minor scratches permissible within standard limits.
What certifications and documentation are provided with ASTM B407-21 products?
Each product is supplied with a Material Test Report (MTR) that includes heat analysis, mechanical test results, and full compliance documentation. Products are marked with the alloy UNS designation (e.g., N08800), ASTM B407-21 reference, heat number, dimensions, and the manufacturer's logo. EN 10204 3.1 or 3.2 certification is available upon request.