ASTM A312 AL6XN Stainless Steel Pipe

 

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.

 

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

 

AL-6XN Stainless Steel Pipe Physical Properties

Property	Value	Units
Density	8.0	g/cm³
Melting Point	1,380 – 1,420	°C
Thermal Conductivity	13.9	W/m·K
Specific Heat	500	J/kg·K
Electrical Resistivity	0.73	μΩ·m
Modulus of Elasticity (Tensile)	193	GPa
Shear Modulus	77	GPa
Poisson's Ratio	0.27	-
Coefficient of Thermal Expansion	13.1	µm/m·°C
Maximum Service Temperature	1,000	°C

 

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 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.