ATI Allegheny Ludlum AL 4466™ Ferritic Stainless Steel

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ATI Allegheny Ludlum AL 4466™ Ferritic Stainless Steel
Categories:	Metal; Ferrous Metal; Ferritic; Stainless Steel; T S40000 Series Stainless Steel
Material Notes:	Low carbon, low nitrogen ferritic stainless steel alloy. Characteristics:outstanding resistance to chloride pitting and crevice corrosion, improved resistance over austenitic stainless steels to chloride stress corrosion cracking. Applications: condenser tubing, feedwater heat tubing, heat exchanger tubing, and high efficiency gas furnace heat exchangers. Information provided by Allegheny Ludlum
Key Words:	UNS S44660
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Physical Properties	Original Value	Comments

Density	7.73 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	98
Tensile Strength, Ultimate	676 MPa
Tensile Strength, Yield	586 MPa @Strain 0.2 %
Elongation at Break	20 %	in 2"

Thermal Properties	Original Value	Comments
CTE, linear	9.80 µm/m-°C @Temperature 20.0 - 150 °C
Specific Heat Capacity	0.500 J/g-°C
Thermal Conductivity	18.1 W/m-K @Temperature 100 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.025 %
Chromium, Cr	27 %
Iron, Fe	>= 65.43 %	As Remainder
Manganese, Mn	0.35 %
Molybdenum, Mo	3.7 %
Nickel, Ni	1.9 %
Niobium, Nb (Columbium, Cb)	0.40 %
Nitrogen, N	0.025 %
Other	0.55 %
Phosphorus, P	<= 0.025 %
Silicon, Si	0.45 %
Sulfur, S	<= 0.0020 %
Titanium, Ti	0.15 %

Descriptive Properties
Corrosion Rate mils per year	0.4	100% Acetic Acid, Boiling
	1	45% Formic Acid, Boiling
	1.1	10% Sulfuric Acid, Boiling
	1.2	65% Nitric Acid, Boiling
	1.3	10% Oxalic Acid, Boiling
	1.4	1% Hydrochloric Acid, Boiling
	1.8	50% Phosphoric Acid, Boiling
Critical Crevice Corrosion Temperature, °C	45
Pitting Potential, Volts vs. Sat. Calomel Electrode	0.85
Stress Corrosion Cracking Resistance (ASTM G30)	Fail	42% MgCl2
	Pass	33% LiCl
	Pass	26% NaCl

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NL1020 / 17788

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