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

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ATI Allegheny Ludlum Stainless Steel AL 904L™ Alloy (UNS N08904)
Categories:	Metal; Ferrous Metal; Austenitic; Stainless Steel
Material Notes:	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.
Key Words:	DIN 1.4539; ASTM B-625; ASME SB-625
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Physical Properties	Original Value	Comments

Density	7.90 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Brinell	150	Typical
Hardness, Rockwell B	70 - 90	79 Is Typical
Tensile Strength, Ultimate	>= 490 MPa
	605 MPa	Typical
Tensile Strength, Yield	>= 220 MPa
	270 MPa	Typical
Elongation at Break	>= 36 %
	50 %	Typical
Reduction of Area	55 %
Modulus of Elasticity	190 GPa

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000952 ohm-cm
Magnetic Permeability	<= 1.02

Thermal Properties	Original Value	Comments
CTE, linear	15.3 µm/m-°C @Temperature 20.0 - 100 °C
	16.5 µm/m-°C @Temperature 20.0 - 400 °C
	18.2 µm/m-°C @Temperature 20.0 - 800 °C
Specific Heat Capacity	0.460 J/g-°C	typical of N08904
Thermal Conductivity	11.5 W/m-K @Temperature 20.0 °C
	12.9 W/m-K @Temperature 100 °C

Component Elements Properties	Original Value	Comments
Carbon, C	<= 0.020 %
Chromium, Cr	19 - 23 %
Copper, Cu	1.0 - 2.0 %
Iron, Fe	47 %	as balance
Manganese, Mn	<= 2.0 %
Molybdenum, Mo	4.0 - 5.0 %
Nickel, Ni	23 - 28 %
Phosphorus, P	<= 0.045 %
Silicon, Si	<= 1.0 %
Sulfur, S	<= 0.035 %

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Overview of materials for Nickel Alloy

NL904L / 17964

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