AL 904L

Do you need custom fasteners created with 904L? Since our inception, Elgin Fastener Group has met every challenge of providing Quality, Timely, Cost-effective solutions for specialty fastener applications. Every product is built to your specifications, using your prints if necessary.

Below are the technical specifications of the 904L Bar Stock we have available to meet your needs.

Allegheny Ludlum Stainless Steel AL 904L™ Alloy (UNS N08904)

Subcategory: Metal; Stainless Steel; T 400 Series Stainless Steel Key Words: DIN 1.4539; ASTM B-625; ASME SB-625

Component Wt. %
C Max 0.02
Cr 19 – 23
Cu 1 – 2
Fe 47
Mn Max 2
Mo 4 – 5
Ni 23 – 28
P Max 0.045
S Max 0.035
Si Max 1

Material Notes: Iron content above calculated as balance.

Allegheny Ludlum AL 904 L™ Alloy (UNS N08904) is an austenitic stainless steel alloy designed for a middles to high level of corrosion resistance. The alloy is produced to low carbon levels for use in the welded condition as in welded vessels and other large and complex fabrications.

The high nickel (25%) and molybdenum (4.5%) contents of the AL 904L alloy provide good resistance to chloride stress corrosion cracking, although not total resistance as judged by the extremely severe laboratory test, boiling magnesium chloride.

The N08904 alloy has been incorporated in ASTM and ASME specifications, and is widely and readily available in a variety of product forms, welding electrodes, and fittings. The AL 904L Alloy has performed well in a variety of service environments such as utility scrubbers, acid and fertilizer production.

Information provided by Allegheny Ludlum Corporation.

Physical Properties Metric English
Density 7.9 g/cc 0.285 lb/in³
Mechanical Properties
Hardness, Brinell 150 150 Typical
Hardness, Rockwell B 70 – 90 70 – 90 79 IsTypical
Tensile Strength, Ultimate Min 490 MPa Min 71100 psi 605 MPa Typical; 490 MPa min.
Tensile Strength, Yield Min 220 MPa Min 31900 psi 270 MPa Typical; 220 MPa min.
Elongation at Break Min 36 % Min 36 % 50% Typical; 36% min.
Reduction of Area 55 % 55 %
Modulus of Elasticity 190 GPa 27600 ksi
Electrical Properties
Electrical Resistivity 9.52e-005 ohm-cm 9.52e-005 ohm-cm
Magnetic Permeability Max 1.02 Max 1.02
Thermal Properties
CTE, linear 20°C 15.3 µm/m-°C 8.5 µin/in-°F Range 20° – 100°C
CTE, linear 500°C 16.5 µm/m-°C 9.17 µin/in-°F Range 20° – 400°C; 18.2 µm/m-°C Range 20°- 800°C
Thermal Conductivity 11.5 W/m-K 79.8 BTU-in/hr-ft²-°F at 20°C; 12.9 W/M-°K at 100°C