AL-6XN® alloy is corrosion-resistant, cost-effective, and available in whatever form you need.

When Allegheny Ludlum developed AL-6XN® alloy (N08367), they intended to create an austenitic stainless alloy that could be made in all product forms and would have superior corrosion resistance properties. AL-6XN is the leading 6Mo stainless alloy due to its excellent chemical, corrosion resistant, mechanical, and high temperature properties.

Chemical Composition of AL-6XN Alloy

AL-6XN's outstanding resistance to corrosion is due to higher concentrations of the following elements:
  • Nitrogen – Slows the formation of chi phase during manufacturing and field welding
  • Chromium – Provides good resistance to oxidizing environments
  • Molybdenum – Improves resistance to chlorides
  • Nickel – Stabilizes the austenitic microstructure and improves overall general corrosion resistance
ElementTypicalAllowable

N08367

Carbon (C)0.020.03 maximum
Manganese (Mn)0.402.00 maximum
Phosphorus (P)0.0200.040 maximum
Sulfur (S)0.0010.030 maximum
Silicon (Si)0.401.00 maximum
Chromium (Cr)20.520.00 – 22.00
Nickel (Ni)24.0023.50 – 25.50
Molybdenum (Mo)6.26.00 – 7.00
Nitrogen (Ni)0.220.18 – 0.25
Copper (Cu)0.20.75 maximum
Iron (Fe)BalanceBalance

Alloy Chemical Comparison

Super AusteniticDuplexTraditional
AL-6XN

(UNS N08367)

904L

(UNS N08904)

254 SMO

(UNS S31254)

2205

(UNS S32205)

2507

(UNS S32750)

1.4435

(UNS S31603)

316L

(UNS S31603)

% Carbon0.020.0150.0150.030.030.03 max0.01
% Chromium20.520.52021.0 – 23.025.017.0 – 19.016.0 – 18.0
% Nickel24.0024.5184.5 – 6.57.00.045 max10.0 – 14.0
% Molybdenum6.204.56.12.5 – 3.54.02.5 – 3.02.0 – 3.0
% Nitrogen0.220.20.14 – 0.20.30.100.1 – 0.16
% Iron (Fe)484754BalanceBalanceBalanceBalance
% Manganese0.41.60.72.01.22.0 max2.0
% Phosphorous0.020.0450.030.0300.035 max0.045 max0.045
% Sulfur0.0010.0350.0100.020.020.0250.030
% Silicon0.400.50.41.000.8 max1.00 max1.00
% Copper0.11.50.70.11

Physical Properties of AL-6XN Alloy

Due to the stable, face-centered cubic crystal structure, commonly referred to as austenitic structure, AL-6XN alloy can be easily used in fabrication. AL-6XN alloy is a good alternative to titanium in condenser tubing applications, as a result of the excellent physical properties listed below.

PropertyValue
Density0.291lb/in3
8.06 g/cm3
Modulus of Elasticity28.3 x 106 psi
195 GPa
Melting Range2410 – 2550°F
1320 – 1400°C
Thermal Conductivity
68 – 212°F
20 – 100°C

6.8 Btu/hr • ft • °F
11.8 W/mK
Coefficient of Expansion
68 – 212°F
20 – 100°C

8.5 • 10-6/°F
15.3 • 10-6/°C
Specific Heat Capacity0.11 Btu/lb • °F
500 J/kg • K
Electrical Resistivity535 Ohm • circ mil/ft
0.89 µohm • cm
Magnetic Permeability
Fully annealed 0.5" plate
65% cold-worked plate

1.0028 Oersted
1.0028 (µ at 200H)
Scaling Temperature1885°F
1030°C