ATI Allegheny Ludlum ALFA-II™ Stainless Steel Type 406

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ATI Allegheny Ludlum ALFA-II™ Stainless Steel Type 406 (discontinued **)
Categories:	Metal; Ferrous Metal; Stainless Steel; T 400 Series Stainless Steel
Material Notes:	Characteristics:superior oxidation resistance for the temperature range 1600°F-over 2200°F, high electrical resistivity, high resistance to sulfidation, high resistance to carburization. Applications:automotive exhaust system components, furnace parts, heat exchangers, recuperator parts, kiln lining, refractory reinforcement fibers. Information provided by Allegheny Ludlum
Key Words:	UNS K91470
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Physical Properties	Metric	English	Comments

Density	7.34 g/cc	0.265 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	89	89
Tensile Strength, Ultimate	554 MPa	80400 psi
Tensile Strength, Yield	412 MPa	59800 psi
Elongation at Break	28 %	28 %	in 2"

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.000120 ohm-cm @Temperature 20.0 °C	0.000120 ohm-cm @Temperature 68.0 °F
	0.000120 ohm-cm @Temperature 204 °C	0.000120 ohm-cm @Temperature 399 °F
	0.000125 ohm-cm @Temperature 427 °C	0.000125 ohm-cm @Temperature 801 °F
	0.000134 ohm-cm @Temperature 649 °C	0.000134 ohm-cm @Temperature 1200 °F

Thermal Properties	Metric	English	Comments
CTE, linear	11.3 µm/m-°C @Temperature 20.0 - 200 °C	6.28 µin/in-°F @Temperature 68.0 - 392 °F
	12.2 µm/m-°C @Temperature 20.0 - 500 °C	6.78 µin/in-°F @Temperature 68.0 - 932 °F
	14.2 µm/m-°C @Temperature 20.0 - 1000 °C	7.89 µin/in-°F @Temperature 68.0 - 1830 °F

Component Elements Properties	Metric	English	Comments
Aluminum, Al	4.0 %	4.0 %
Carbon, C	0.025 %	0.025 %
Chromium, Cr	13 %	13 %
Iron, Fe	82.76 %	82.76 %	As Remainder
Manganese, Mn	0.035 %	0.035 %
Silicon, Si	0.30 %	0.30 %
Titanium, Ti	0.40 %	0.40 %

Descriptive Properties
Anodic Polarization	Ep=0.28 volts vs. saturated calomel electrode, Er=-0.17 volts vs. saturated calomel electrode		1000 ppm Cl-(NaCl) pH5
	IC=2.0mA/cm2		1 Normal H2SO4
Corrosion Rate mils per year	0.04		20% Acetic Acid
	1.85		20% Phosphoric Acid
	1803.1		10% Sodium Bisulfate
	3549.9		10% Sulfamic Acid
	399.24		10% Oxalic Acid
	8.64		65% Nitric Acid
Crevice Corrosion-Average Weight Loss, g/cm2	0.0336 (21.1°C, 72 Hours, Plain)		10% Ferric Chloride Rubber Band Test
	0.327 (21.1°C, 72 Hours, Welded)		10% Ferric Chloride Rubber Band Test
Stress Corrosion Cracking Resistance	No cracks (Plain and Welded)		33% Lithium Chloride(500 hours), 42% Magnesium Chloride(200 hours), 26% Sodium Chloride(1000 hours), 50% Sodium Hydroxide(200 hours)

**
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