Latrobe Lescalloy® HP 9-4-30 VAC-ARC ; 13.5 in RCS Billet Size High Strength Alloy Steel

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Latrobe Lescalloy® HP 9-4-30 VAC-ARC ; 13.5 in RCS Billet Size High Strength Alloy Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Low Alloy Steel; Carbon Steel; Medium Carbon Steel
Material Notes:	LESCALLOY HP 9-4-30 VAC-ARC steel is a low alloy, high strength steel with a high nickel and cobalt content to promote toughness. The alloy has been designed to have high hardenability, good weldability and excellent fracture toughness. It is typically used in the 220/240,000 psi (1517/1655 MPa) tensile strength range. Lescalloy HP 9-4-30 VAC-ARC steel is produced by the consumable electrode vacuum arc remelting process to provide optimum cleanliness and preferred ingot structure. Normalized at 927°C; Austenitized at 829°C for .5 hour Information Provided by Timken Latrobe Steel. Timken sold Latrobe in December 2006. They are now Latrobe Specialty Steels Co.
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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 C	51	51	1" from quench end; Jominy End Quench Hardenability
	51	51	1/2" from quenched end; Jominy End Quench Hardenability
	52	52	1/8" from quenched end; Jominy End Quench Hardenability
Tensile Strength, Ultimate	1580 - 1590 MPa	229000 - 230000 psi
Tensile Strength, Yield	1260 - 1300 MPa @Strain 0.2 %	183000 - 189000 psi @Strain 0.2 %
Elongation at Break	14 - 14.7 %	14 - 14.7 %
Reduction of Area	45.9 - 50.3 %	45.9 - 50.3 %
Fracture Toughness	143 MPa-m½	130 ksi-in½
Charpy Impact	27.0 J @Temperature -54.0 °C	19.9 ft-lb @Temperature -65.2 °F	V-notch

Thermal Properties	Metric	English	Comments
CTE, linear	11.3 µm/m-°C @Temperature 20.0 - 427 °C	6.28 µin/in-°F @Temperature 68.0 - 801 °F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.30 %	0.30 %
Chromium, Cr	1.0 %	1.0 %
Cobalt, Co	4.5 %	4.5 %
Iron, Fe	85.2 %	85.2 %
Manganese, Mn	0.30 %	0.30 %
Molybdenum, Mo	1.0 %	1.0 %
Nickel, Ni	7.5 %	7.5 %
Silicon, Si	0.10 %	0.10 %
Vanadium, V	0.10 %	0.10 %

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NTIMK043 / 19390

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