ATI Allegheny Ludlum 440A Martensitic Stainless Steel

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ATI Allegheny Ludlum 440A Martensitic Stainless Steel
Categories:	Metal; Ferrous Metal; Martensitic; Stainless Steel; T 400 Series Stainless Steel
Material Notes:	Characteristics: superior wear resistance, hardenable, excellent corrosion resistance. Applications:cutlery, dental and surgical instruments, nozzles, valve parts, hardened steel ball and seats for oil well pumps, separating screens and strainers, springs, shears, and wear surfaces. Information provided by Allegheny Ludlum
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Physical Properties	Original Value	Comments

Density	7.72 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell B	95
Hardness, Rockwell C	31	Hardened+Tempered 1200°F
	41	Hardened+Tempered 1000°F
	50	Hardened+Tempered 550°F
	52	Hardened+Tempered 900°F
	53	Hardened+Tempered 600°F
	53	Hardened+Tempered 800°F
	54	Hardened+Tempered 400°F
Tensile Strength, Ultimate	717 MPa	Annealed
	933 MPa	Hardened 1900°F, Tempered 1200°F
	1224 MPa	Hardened 1900°F, Tempered 1000°F
	1858 MPa	Hardened 1900°F, Tempered 900°F
	1879 MPa	Hardened 1900°F, Tempered 550°F
	1881 MPa	Hardened 1900°F, Tempered 800°F
	1883 MPa	Hardened 1900°F, Tempered 600°F
	2022 MPa	Hardened 1900°F, Tempered 400°F
Tensile Strength, Yield	727 MPa	Hardened 1900°F, Tempered 1200°F
	1013 MPa	Hardened 1900°F, Tempered 1000°F
	1466 MPa	Hardened 1900°F, Tempered 900°F
	1518 MPa	Hardened 1900°F, Tempered 550°F
	1531 MPa	Hardened 1900°F, Tempered 600°F
	1579 MPa	Hardened 1900°F, Tempered 400°F
	1610 MPa	Hardened 1900°F, Tempered 800°F
	427 MPa @Strain 0.2 %	Annealed
Elongation at Break	20 %	Annealed

Electrical Properties	Original Value	Comments
Electrical Resistivity	0.0000620 ohm-cm

Thermal Properties	Original Value	Comments
CTE, linear	15.0 µm/m-°C @Temperature 20.0 - 200 °C
	16.8 µm/m-°C @Temperature 20.0 - 600 °C
Specific Heat Capacity	0.460 J/g-°C
Thermal Conductivity	24.2 W/m-K @Temperature 100 °C
Melting Point	1399 - 1510 °C
Solidus	1399 °C
Liquidus	1510 °C

Component Elements Properties	Original Value	Comments
Carbon, C	0.60 - 0.75 %
Chromium, Cr	16 - 18 %
Iron, Fe	77.9 - 83.4 %	as balance
Manganese, Mn	<= 1.0 %
Molybdenum, Mo	<= 0.75 %
Nickel, Ni	<= 0.50 %
Phosphorus, P	<= 0.040 %
Silicon, Si	<= 1.0 %
Sulfur, S	<= 0.030 %

Descriptive Properties
Corrosion Rate mils per year	0.35 (5% Phosphoric Acid at 49°C)	Hardened martensitic grades were tested after tempering at 204°C
	2.31 (5% Acetic Acid at 49°C)	Hardened martensitic grades were tested after tempering at 204°C
Pitting Potential, Volts vs. Sat. Calomel Electrode	0.598	100 ppm Chloride solution at 24°C, pH5, ground surface. Hardened martensitic grades were tested after tempering at 204°C.

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NL1037 / 17805

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