ASTM B673 Welded UNS N08925, N08354, N08926 Alloy Pipe
- Grade: UNS N08925, UNS N08354, UNS N08926
- Outside Diameter (OD): NPS 1/8″ -30″ (10.3-762mm)
- Wall Thickness (WT): SCH 5S, 10S, 40S, 80S, 160S
Features
ASTM B673 UNS N08925 N08354 and N08926 Welded Pipe
Chemical Composition (wt.%)
| Element | UNS N08925 | UNS N08354 | UNS N08926 |
|---|---|---|---|
| Carbon (max) | 0.020% | 0.030% | 0.020% |
| Manganese (max) | 1.0% | 1.00% | 2.00% |
| Phosphorus (max) | 0.045% | 0.030% | 0.030% |
| Sulfur (max) | 0.030% | 0.010% | 0.010% |
| Silicon (max) | 0.50% | 1.00% | 0.50% |
| Nickel | 24.0 to 26.0% | 34.0 to 36.0% | 24.00 to 26.00% |
| Chromium | 19.0 to 21.0% | 22.0 to 24.0% | 19.00 to 21.00% |
| Molybdenum | 6.0 to 7.0% | 7.0 to 8.0% | 6.0 to 7.0% |
| Copper | 0.8 to 1.5% | – | 0.5 to 1.5% |
| Nitrogen | 0.1 to 0.2% | 0.17 to 0.24% | 0.15 to 0.25% |
| Iron (Balance) | Balance | Balance | Balance |
Mechanical Properties
| Alloy | Tensile Strength (min) | Yield Strength (0.2% Offset, min) | Elongation (min) |
| UNS N08925 | 87,000 psi (600 MPa) | 43,000 psi (300 MPa) | 40% |
| UNS N08354 | 93,000 psi (640 MPa) | 43,000 psi (295 MPa) | 40% |
| UNS N08926 | 94,000 psi (650 MPa) | 43,000 psi (295 MPa) | 35% |
Technical Specifications
| Specification | Value |
| Standard | ASTM B673 Nickel-Iron-Chromium-Molybdenum and Iron-Nickel-Chromium-Molybdenum-Copper Welded Pipe |
| Grade | UNS N08925, UNS 8354, and UNS N08926 |
| Manufacturing Process | Automatic welding |
| Seam Type | Welded |
| Welded Pipe SPS Diameters | Outside Diameter (OD) Range: NPS 1/8″-30″ (10.3-762mm), Wall Thickness (WT) Range: SCH5, SCH10, SCH40, SCH80, SCH160 (1.65-33.32mm) |
| Length | 6000-12000mm |
| Delivery Condition | Annealed |
| Inspection Certificate | EN 10204 Type 3.1 (Mill Test Certificate), EN 10204 Type 3.2 (Witness Testing or 3rd Party Inspection) |
| Test | Chemical analysis, Tensile test, Flattening test, Expansion test, Hydrostatic test, Nondestructive testing (NDT), Intergranular corrosion test, Metallographic examination |
Packing
Packed in plywood box or on pallets or loosely packed.
Application
Chemical Processing: The excellent resistance to stress corrosion cracking and pitting, especially in chloride and acidic environments, makes these pipes ideal for handling aggressive chemicals, such as sulfuric acid, phosphoric acid, and chlorides.
Oil and Gas Industry: They are used in offshore platforms, pipelines, and refineries due to their resistance to sour gas environments containing hydrogen sulfide.
Power Generation: These pipes find application in flue gas desulfurization systems and other pollution control equipment due to their ability to withstand high temperatures and corrosive environments.
Pharmaceutical and Food Processing: The high purity and corrosion resistance of these alloys make them suitable for hygienic applications where product contamination is a concern.
Wastewater Treatment: Due to their resistance to corrosion and erosion, these pipes are used in wastewater treatment plants for handling harsh chemicals and effluents.
Marine Environments: The alloys’ resistance to seawater corrosion makes them ideal for use in shipbuilding, desalination plants, and other marine applications.
Specific applications
UNS N08925: This alloy offers superior resistance to reducing acids and is often chosen for chemical processing, oil and gas, and pollution control applications.
UNS N08364: This alloy exhibits excellent resistance to stress corrosion cracking and is often used in sour gas environments and seawater applications.
UNS N08926: This alloy provides enhanced resistance to oxidizing environments and is often employed in chemical processing involving nitric acid and other oxidizing media.
