ASTM B167
ASTM B167 Nickel-Copper Alloy Tube
ASTM B725 is the Standard Specification for Welded Nickel and Nickel-Alloy Tubes, manufactured from flat-rolled alloy strip and welded using an automatic welding process, with or without filler metal.
This standard covers tubes intended for:
Corrosive environments
High-temperature service
Heat exchangers & condensers
General engineering and industrial applications
ASTM B725 tubes are widely used in demanding industries because nickel-based alloys demonstrate excellent corrosion resistance, mechanical strength, and reliability in aggressive media.
Key Features
Welded Tube Standard: Applicable only to welded tubes made from nickel & nickel-alloy strip.
High Corrosion Resistance: Suitable for acids, seawater, alkalis, and chlorides.
High-Temperature Performance: Excellent strength & oxidation resistance at elevated temperatures.
Multiple Nickel Alloys: Covers Ni, Ni-Cr, Ni-Fe, Ni-Mo, Ni-Cu alloys.
Automatic Welding: TIG, plasma, laser, or multi-pass welding with bead control.
Quality Testing: Hydrostatic / Eddy Current / Mechanical testing mandatory.
Heat-Treated Supply: Typically annealed or solution annealed.
Technical Specification
| Specification Aspect | Details |
|---|---|
| Standard | ASTM B725 |
| Product Type | Welded Tubes |
| Manufacturing | Automatic welding (with/without filler) |
| Diameter Range | 6 mm – 300 mm |
| Wall Thickness | 0.5 mm – 12.7 mm |
| Length | SRL / DRL / Cut Length |
| Heat Treatment | Annealed / Solution Annealed |
| Surface Finish | Pickled, Bright Annealed, Polished |
| Testing | Hydrostatic, Eddy Current, Mechanical Tests |
| Main Grades | N02200, N02201, N06600, N06601, N08800, N08825 |
Chemical Composition
| Element (%) | N02200 (Nickel 200) |
N02201 (Nickel 201) |
N06600 (Inconel 600) |
N06601 (Inconel 601) |
N08800 (Incoloy 800) |
N08825 (Incoloy 825) |
|---|---|---|---|---|---|---|
| Nickel (Ni) | ≥99.0 | ≥99.0 | ≥72.0 | ≥58.0 | 30.0–35.0 | 38.0–46.0 |
| Chromium (Cr) | — | — | 14.0–17.0 | 21.0–25.0 | 19.0–23.0 | 19.5–23.5 |
| Iron (Fe) | ≤0.40 | ≤0.40 | 6.0–10.0 | Balance | Balance | Balance |
| Molybdenum (Mo) | — | — | — | — | — | 2.5–3.5 |
| Copper (Cu) | ≤0.25 | ≤0.25 | ≤0.5 | ≤1.0 | ≤0.75 | 1.5–3.0 |
| Manganese (Mn) | ≤0.35 | ≤0.35 | ≤1.0 | ≤1.0 | ≤1.5 | ≤1.0 |
| Silicon (Si) | ≤0.35 | ≤0.35 | ≤0.5 | ≤0.5 | ≤1.0 | ≤0.5 |
| Carbon (C) | ≤0.15 | ≤0.02 | ≤0.15 | ≤0.10 | ≤0.10 | ≤0.05 |
| Titanium (Ti) | — | — | — | — | 0.15–0.60 | 0.6–1.2 |
| Sulfur (S) | ≤0.01 | ≤0.01 | ≤0.015 | ≤0.015 | ≤0.015 | ≤0.03 |
Mechanical Properties
| Grade | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| N02200 | 380 | 105 | 40 |
| N02201 | 345 | 95 | 40 |
| N06600 | 655 | 240 | 30 |
| N06601 | 585 | 205 | 30 |
| N08800 | 520 | 205 | 30 |
| N08825 | 690 | 275 | 30 |
Physical Properties
| Property | Value Range |
|---|---|
| Density | 8.1 – 8.9 g/cm³ |
| Melting Point | 1350 – 1455°C |
| Thermal Conductivity | 10–16 W/m·K |
| Modulus of Elasticity | 195–220 GPa |
| Coefficient of Expansion | 12–15 µm/m·°C |
| Electrical Resistivity | 0.8–1.3 µΩ·m |
Types of Products
Welded Heat Exchanger Tubes
Welded Condenser Tubes
Welded Boiler & Heater Tubes
General Service Welded Tubes
Process & Instrumentation Tubes
Grades Covered
Nickel 200 (N02200)
Nickel 201 (N02201)
Inconel 600 (N06600)
Inconel 601 (N06601)
Incoloy 800 / 800H / 800HT (N08800 / 810 / 811)
Incoloy 825 (N08825)
Alloy 20 (N08020) – optional
Monel 400 (N04400) – optional
Processing & Manufacturing
Selection of nickel alloy strip
Forming into tubular shape
Automatic welding (TIG / Plasma / Laser)
Weld bead removal (internal/external)
Heat treatment (annealing/solution annealing)
Sizing, straightening
Non-destructive testing (EC / Hydro)
Surface finishing (pickled / BA / polished)
Applications
Chemical & petrochemical heat exchangers
Refining & petrochemical processing
Power plant condensers & steam generators
Marine & offshore systems
Pulp & paper digesters
High-temperature furnace components
Pharmaceutical and high-purity fluid systems