ASTM B690 Seamless UNS N08366, N08367 Alloy Pipe and Tube
- Grade: UNS N08366, UNS N08367 (AL-6XN, X1NiCrMoCuN25-20-7, EN 1.4529)
- Type: Iron-Nickel-Chromium-Molybdenum Alloys
- Pipe OD: NPS 1/4″ -6″ (13.7-168.3mm), Pipe WT: SCH 5, 10, 40, 80
- Tube OD: 6.4-152.4mm, Tube WT: 1.65-8.56mm
Features
ASTM B690 UNS N08366 & N08367 Seamless Pipe and Tube
Chemical Composition of ASTM B690 Seamless UNS N08366, N08367 Alloy Pipe and Tube (wt.%)
| Element | Composition Limits, % (N08366) | Composition Limits, % (N08367) |
|---|---|---|
| Carbon | 0.035 max | 0.030 max |
| Manganese | 2.00 max | 2.00 max |
| Silicon | 1.00 max | 1.00 max |
| Phosphorus | 0.040 max | 0.040 max |
| Sulfur | 0.030 max | 0.030 max |
| Chromium | 20.00 to 22.00 | 20.00 to 22.00 |
| Nickel | 23.50 to 25.50 | 23.50 to 25.50 |
| Molybdenum | 6.00 to 7.00 | 6.00 to 7.00 |
| Nitrogen | … | 0.18 to 0.25 |
| Iron | remainder | remainder |
| Copper | 0.75 max | 0.75 max |
Mechanical Properties of ASTM B690 Seamless UNS N08366 (Annealed) and UNS N08367 Alloy Pipe and Tube
| Property | Specification (ksi [MPa]) |
|---|---|
| Tensile strength | 75 [517] minimum |
| Yield strength (0.2% offset) | 30 [206] minimum |
| Elongation (in 2 in. or 50 mm) | 30% minimum |
Please note, the values provided are minimum requirements; actual material properties can vary based on specific material processing and condition.
Technical Specifications
| Specification | Value |
| Standard | ASTM B690 Iron-Nickel-Chromium-Molybdenum Alloy Seamless Pipe and Tube |
| Grade | UNS N08366, UNS N08367 (AL-6XN, X1NiCrMoCuN25-20-7, EN 1.4529) |
| Manufacturing Process | cold-finished of hot-finished |
| Seam Type | Seamless |
| Pipe Size | Outside Diameter (OD): NPS 1/4″ -6″, Wall Thickness (WT): SCH5, SCH10, SCH40, SCH80 |
| Tube Size | Outside Diameter (OD): 6.4 -152.4mm, Wall Thickness (WT): 1.65-8.56mm |
| 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 (NDE Test), Intergranular corrosion test, Metallographic examination |
Packing
Pipes with plain or bevelled ends, equipped with caps or bevel protectors. Small diameter pipes are packed in wooden crates or wrapped in woven bags and hexagonally bundled. Large-diameter pipes are loosely packed and wrapped in woven bags.
Application
Heat exchangers and condensers: Used in processes involving seawater or brackish water cooling due to their resistance to chloride-induced corrosion.
Process piping and equipment: Handling corrosive chemicals, particularly those containing chlorides, at high temperatures and pressures.
Offshore platforms and subsea equipment: Their resistance to seawater and chloride-induced corrosion makes them suitable for offshore applications.
Sour gas wells: Used for downhole tubing and equipment exposed to H2S and CO2 environments.
Evaporators and piping systems: Excellent resistance to seawater corrosion and pitting makes them ideal for desalination applications.
Handling of corrosive wastewater and sludge: Provides reliable performance in harsh environments containing chlorides and other contaminants.
