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	Metric	English	Comments

Density	7.75 g/cc	0.280 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	80	80
Tensile Strength, Ultimate	517 MPa	75000 psi
Tensile Strength, Yield	345 MPa @Strain 0.2 %	50000 psi @Strain 0.2 %
Elongation at Break	30 %	30 %	in 2"

Thermal Properties	Metric	English	Comments
CTE, linear	11.0 µm/m-°C @Temperature 20.0 - 200 °C	6.11 µin/in-°F @Temperature 68.0 - 392 °F
Specific Heat Capacity	0.427 J/g-°C	0.102 BTU/lb-°F
Thermal Conductivity	26.8 W/m-K @Temperature 100 °C	186 BTU-in/hr-ft²-°F @Temperature 212 °F

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

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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