ATI Allegheny Ludlum AL 444™ Ferritic Stainless Steel

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ATI Allegheny Ludlum AL 444™ 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:practically immune to chloride stress corrosion cracking, enhanced resistance to pitting and crevicing, good general corrosion resistance, good creep resistance. Applications: heat exchangers tubing, food processing equipment, automotive exhausts, and hot water tanks. Information provided by Allegheny Ludlum
Key Words:	UNS S44400
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Physical Properties	Original Value	Comments

Density	7.75 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	80	Typical
Tensile Strength, Ultimate	517 MPa	Typical
Tensile Strength, Yield	345 MPa @Strain 0.2 %	Typical
Elongation at Break	30 %	in 2", Typical

Thermal Properties	Original Value	Comments
CTE, linear	11.0 µm/m-°C @Temperature 20.0 - 200 °C
Specific Heat Capacity	0.427 J/g-°C
Thermal Conductivity	26.8 W/m-K @Temperature 100 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.013 %
Chromium, Cr	18.2 %
Iron, Fe	>= 79.79 %	As Remainder
Manganese, Mn	0.30 %
Molybdenum, Mo	1.9 %
Nickel, Ni	<= 0.50 %
Niobium, Nb (Columbium, Cb)	0.27 %
Nitrogen, N	0.015 %
Other	0.40 %
Phosphorus, P	<= 0.030 %
Silicon, Si	0.45 %
Sulfur, S	<= 0.0020 %
Titanium, Ti	0.13 %

Descriptive Properties
Corrosion Rate mils per year	>1000	10% Sulfamic Acid, Boiling
	>1000	10% Sulfuric Acid, Boiling
	0.1	20% Acetic Acid, Boiling
	1.7	1% Hydrochloric Acid, Boiling
	101	10% Oxalic Acid, Boiling
	18	65% Nitric Acid, Boiling
	2.3	20% Phosphoric Acid, Boiling
	27.1	45% Formic Acid, Boiling
	293	50% Sodium Hydroxide, Boiling
Pitting Potential, Volts vs. Sat. Calomel Electrode	0.58
Stress Corrosion Cracking Resistance (ASTM G30)	Pass	42% MgCl2
	Pass	33% LiCl
	Pass	26% NaCl

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NL1019 / 17787

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