Latrobe Lescalloy® 4340 VAC-ARC ; 3.5" round High Strength Alloy Steel

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Latrobe Lescalloy® 4340 VAC-ARC ; 3.5" round High Strength Alloy Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Low Alloy Steel; Carbon Steel; High Carbon Steel
Material Notes:	LESCALLOY 4340 VAC-ARC steel is a low alloy, nickel-chromium-molybdenum steel capable of being heat treated to high strength levels. The alloy has a good combination of ductility, toughness and strength along with high hardenability. Tempered At 204°C 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	7.83 g/cc	0.283 lb/in³

Mechanical Properties	Metric	English	Comments
Hardness, Rockwell C	52 - 60	52 - 60	1/8" from quenched end
Tensile Strength, Ultimate	1900 MPa	276000 psi	204°C Temper Temperature
Tensile Strength, Yield	1530 MPa	222000 psi	204°C Temper Temperature
Elongation at Break	11 %	11 %	204°C Temper Temperature
Reduction of Area	35 %	35 %	204°C Temper Temperature

Thermal Properties	Metric	English	Comments
CTE, linear	11.3 µm/m-°C @Temperature 18.0 - 93.0 °C	6.28 µin/in-°F @Temperature 64.4 - 199 °F
	14.6 µm/m-°C @Temperature 18.0 - 648 °C	8.11 µin/in-°F @Temperature 64.4 - 1200 °F
Specific Heat Capacity	0.448 J/g-°C	0.107 BTU/lb-°F
Thermal Conductivity	37.48 W/m-K	260.1 BTU-in/hr-ft²-°F

Component Elements Properties	Metric	English	Comments
Carbon, C	0.40 %	0.40 %
Chromium, Cr	0.80 %	0.80 %
Iron, Fe	95.7 %	95.7 %
Manganese, Mn	0.75 %	0.75 %
Molybdenum, Mo	0.25 %	0.25 %
Nickel, Ni	1.8 %	1.8 %
Silicon, Si	0.30 %	0.30 %

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NTIMK025 / 19373

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