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ASTM B423-22
Standard Specification for Nickel-Iron-Chromium-Molybdenum-Copper Alloy Seamless Pipe and Tube.
ASTM B423 / ASME SB 423 specification covers nickel-iron-chromium-molybdenum-copper alloys (Incoloy 825 UNS N08825 and UNS N08221) in the form of cold-worked and hot-finished seamless pipe and tube intended for general corrosive service.
ASTM B423 specification covers nickel-iron-chromium-molybdenum-copper alloys in the form of cold-worked and hot-finished seamless pipe and tube intended for general corrosive service. The general requirements for pipe and tube are covered in Specification B829.
astm b423 Key Specifications
| Feature | Specification Details |
| Standard | ASTM B423 / ASME SB423 |
| Material Grade | UNS N08825 (Incoloy 825) |
| Pipe Type | Seamless (SMLS) |
| Size Range | OD: 1/4" to 12" (6mm to 323.8mm); WT: SCH5S - SCH160 |
| Ends | Plain End, Beveled End, Threaded |
| Finishing | Annealed & Pickled, Bright Annealed |
| Testing | Hydrostatic, Eddy Current, Ultrasonic, Grain Size |
ASTM B423 UNS N08825 Chemical Composition
Chemical composition limits of materials such as nickel, chromium, iron, manganese, carbon, copper, silicon, sulfur, aluminum titanium, and molybdenum shall conform to the chemical requirements of this specification.
| Grade | C≤ | Mn≤ | Si≤ | S≤ | Cu≤ | Fe(min) | Ni | Cr | Al | Ti |
| Incoloy Alloy 825 UNS N08825 Pipe Tube | 0.05 | 1 | 0.5 | 0.03 | 1.5-3.0 | 22 | 38.0~46.0 | 19.5~23.5 | 0.2 | 0.6-1.2 |
Permissible Variations for Small-Diameter and Light-Wall Tube
| Specified Outside Diameter, in. (mm) | Outside Diameter, in. (mm) | Inside Diameter, in. (mm) | Wall Thickness, % | |||
| + | - | + | - | + | - | |
| Under 3/32 (2.4) | 0.002 (0.05) | 0 | 0 | 0.002 (0.05) | 10 | 10 |
| 3/32 to 3/16 (2.4 to 4.8), excl | 0.003 (0.08) | 0 | 0 | 0.003 (0.08) | 10 | 10 |
| 3/16 to 1/2 (4.8 to 12.7), excl | 0.004 (0.10) | 0 | 0 | 0.004 (0.10) | 10 | 10 |
| 1/2 to 1 1/4 (12.7 to 31.8), incl | 0.005 (0.13) | 0 | 0 | 0.005 (0.13) | 10 | 10 |
Tolerances on Cut Lengths of Light-Wall Tube
| Length, ft (m) | Tube Size, in. (mm) | Permissible Variations, in. (mm) | |
| Over | Under | ||
| Under 1 (0.30) | up to 1.250 (31.8), incl | 1/32 (0.8) | 0 (0) |
| 1 to 4 (0.30 to 1.22), incl | up to 1.250 (31.8), incl | 1/16 (1.6) | 0 (0) |
| Over 4 to 10 (1.22 to 3.0), incl | up to 1.250 (31.8), incl | 3/32 (2.4) | 0 (0) |
| Over 10 (3.0) | up to 1.250 (31.8), incl | 3/16 (4.8) | 0 (0) |
FAQ
Q: What is the difference between ASTM B423 and ASTM B424?
A: ASTM B423 covers seamless pipe and tube, while ASTM B424 covers nickel-iron-chromium-molybdenum-copper alloy plate, sheet, and strip.
Q: Is Incoloy 825 the same as UNS N08825?
A: Yes, UNS N08825 is the Unified Numbering System designation, and Incoloy 825 is the common trade name for this alloy.
Q: Can you provide customized lengths for N08825 tubes?
A: Yes, we provide fixed-length cutting services and U-bending for heat exchanger applications.
One-Stop Integrated Industrial Procurement Partner
Stop dealing with fragmented supply chains. HT PIPE handles your entire multi-component engineering bill of materials (BOM) under unified traceabilty standards. Along with ASTM B423 UNS N08825 pipes, we supply matching:
- ASTM B424 Incoloy 825 Plates, Sheets & Slit Strips
- ASTM B425 UNS N08825 Forged Round Bars & Rod Profiles
- Forged Pipe Fittings & ASME B16.5 / B16.47 Flanges (Elbows, Tees, Reducers, Weldnocks, Blinds)
- Custom Pre-Fabricated Pipe Spool Assemblies (Engineered to isometric schematic prints)
