ATI Allegheny Ludlum Type AL 441HP™ Stainless Steel Alloy

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ATI Allegheny Ludlum Type AL 441HP™ Stainless Steel Alloy
Categories:	Metal; Ferrous Metal; Stainless Steel; T 400 Series Stainless Steel
Material Notes:	Allegheny Ludlum stainless Type AL 441HP™ alloy is a heat resisting ferritic grade providing good oxidation and corrosion resistance for applications like automotive exhaust system components. Dual stabilized with columbium and titanium to provide good weld ductility and resistance to intergranular corrosion in the weld heat affected zone. AL 441HP™ alloy has been developed for the severe tube bending and forming operations typical in automotive exhaust manifold fabrication. Tight control on carbon and nitrogen levels plus improved mill processing result in enhanced formability is terms of higher tube bending speeds and lower breakage or scrap rate. Information provided by Allegheny Ludlum Corporation.
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Physical Properties	Metric	English	Comments

Density	7.711 g/cc	0.2786 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell B	82	82	typical
Tensile Strength, Ultimate	496 MPa	71900 psi	Typical
Tensile Strength, Yield	310 MPa	45000 psi	Typical
Elongation at Break	31 %	31 %	typical in 2" (50 mm)

Electrical Properties	Metric	English	Comments
Electrical Resistivity	0.0000587 ohm-cm	0.0000587 ohm-cm

Thermal Properties	Metric	English	Comments
CTE, linear	9.20 µm/m-°C @Temperature 20.0 - 100 °C	5.11 µin/in-°F @Temperature 68.0 - 212 °F	Type 441
	10.3 µm/m-°C @Temperature 20.0 - 300 °C	5.72 µin/in-°F @Temperature 68.0 - 572 °F	Type 441
	10.6 µm/m-°C @Temperature 20.0 - 500 °C	5.89 µin/in-°F @Temperature 68.0 - 932 °F
	10.8 µm/m-°C @Temperature 20.0 - 700 °C	6.00 µin/in-°F @Temperature 68.0 - 1290 °F
	11.3 µm/m-°C @Temperature 20.0 - 800 °C	6.28 µin/in-°F @Temperature 68.0 - 1470 °F
	11.9 µm/m-°C @Temperature 20.0 - 900 °C	6.61 µin/in-°F @Temperature 68.0 - 1650 °F	Type 441
Maximum Service Temperature, Air	1010 °C	1850 °F	Continuous service

Component Elements Properties	Metric	English	Comments
Aluminum, Al	0.050 %	0.050 %
Carbon, C	0.0090 %	0.0090 %
Chromium, Cr	18 %	18 %
Iron, Fe	79 %	79 %	as balance
Manganese, Mn	0.35 %	0.35 %
Nickel, Ni	0.30 %	0.30 %
Niobium, Nb (Columbium, Cb)	0.71 %	0.71 %
Nitrogen, N	0.014 %	0.014 %
Phosphorus, P	0.023 %	0.023 %
Silicon, Si	0.34 %	0.34 %
Sulfur, S	0.0020 %	0.0020 %
Titanium, Ti	0.29 %	0.29 %

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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NL441H / 17951

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