What is ASTM A312 Stainless Steel AL6XN Pipe?
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What is ASTM A312 Stainless Steel AL6XN Pipe?
AL-6XN (UNS N08367) stainless steel pipe is a modern super-austenitic stainless steel. Within the metal material classification system, it is classified as a six-molybdenum grade super stainless steel due to its high molybdenum content of 6.0-7.0%, significantly exceeding that of conventional stainless steel. This highly alloyed austenitic stainless steel offers excellent corrosion resistance and a relatively reasonable cost, making it an economical alternative to nickel-based alloys in harsh corrosive environments.
ASTM A312 Stainless Steel AL6XN Pipe Chemical Composition, %
| Ni | Cr | Mo | C | N | Mn | Si | P | S | Cu | Fe |
|---|---|---|---|---|---|---|---|---|---|---|
|
23.5-25.5 |
20.00-22.00 |
6.00-7.00 |
0.03 Max |
0.18-0.25 |
2.0 Max |
1.00 Max |
.040 Max |
0.03 Max |
0.75 Max |
Remainder |
UNS N08367 welded pipe mechanical properties
| Ultimate Tensile Strength, ksi | 95 |
| 0.2% Yield Strength, ksi | 45 |
| Elongation | 30 |
| Hardness MAX, HRC | 30.5 |
al6xn pipe Physical Properties
AL-6XN has a density of 8.24 g/cm³, slightly higher than conventional stainless steels (such as 7.93 g/cm³ for 304 stainless steel), which is related to its high alloy content. Regarding thermal properties, it exhibits low thermal conductivity (approximately 11.9 W/(m·K) at 20°C), which means it has good thermal insulation properties, but requires careful attention to heat management during welding and heat treatment.
Application of al6xn stainless steel pipe
Oil and gas: submarine pipelines, downhole tools for acid gas wells.
Chemical equipment: sulfuric acid reactors, phosphoric acid evaporators, pickling equipment.
Nuclear industry: containers and pipelines for nuclear waste treatment systems.
Marine engineering: seawater desalination devices, heat exchangers.
Environmental protection: key components of flue gas desulfurization (FGD) systems.
What material is similar to AL-6XN?
Equivalent materials to the super-austenitic stainless steel AL-6XN (UNS N08367) include other high-molybdenum (6Mo) stainless steels like UNS S31254 (254SMO) and the proprietary AL-6XN Plus®, which has a higher alloying content. For even more corrosive environments, Hastelloy C-22 is a common, higher-nickel, super-alloy alternative, though it has different chemical and mechanical properties. The best equivalent depends on the specific corrosive application and the required balance of corrosion resistance, strength, availability, and cost.
What is the difference between AL-6XN and alloy 20?
AL6XN is used in low PH applications in food, oil and gas industries, reverse osmosis, scrubbers, and distillation columns. Alloy 20 is used to manufacture pharmaceuticals, food, explosives, chemical and petroleum refinement.
Stainless Steel Al6xn Supplier
GNEE is a reputable supplier and exporter. Our inventory includes Al6xn tubes, Al6xn stainless steel sheets, Al6xn bars, as well as high-quality fittings, flanges, and fasteners. Contact us today for competitive pricing and detailed specifications-with no strings attached and expert support.
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