Carpenter Pyrotough® 78 Hot Work Die Steel

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Carpenter Pyrotough® 78 Hot Work Die Steel
Categories:	Metal; Ferrous Metal; Carbon Steel; Tool Steel; Hot Work Steel
Material Notes:	Pyrotough® 78 alloy is a premium quality hot work die steel engineered to withstand the operating temperatures and pressures associated with die casting and hot extrusion operations. The patented composition of the alloy displays improved temper resistance/red-hardness and similar toughness when compared to standard AISI type H13 hot work die steel. Careful control over all stages of processing results in an alloy possessing a high degree of purity, homogeneity and microstructural integrity. Applications: mandrels for extruding copper, brass, stainless steel, and nickel-base superalloys, dies for extruding copper and brass Information provided by Carpenter Technology Corporation. Pyrotough® is a registered trademark of Carpenter Technology Corporation.
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Physical Properties	Original Value	Comments

Specific Gravity	7.75 g/cc

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	54	As hardened
	56.5	Tempered at 1000°F
Tensile Strength, Ultimate	1860 MPa	3 in bar
	1515 MPa @Temperature 427 °C	3 in bar
Tensile Strength, Yield	1655 MPa @Strain 0.2 %	3 in bar
	1480 MPa @Strain 0.2 %, Temperature 427 °C	3 in bar
Elongation at Break	9.0 %	Elongation in 4D, 3 in bar
	15 % @Temperature 427 °C	Elongation in 4D, 3 in bar
Reduction of Area	43 %	3 in bar
	59 % @Temperature 427 °C	3 in bar
Charpy Impact	14.9 J	V Notch, 3 in bar
	29.8 J @Diameter 3.00 mm, Temperature 427 °C	V-Notch, bar
Abrasion	120	loss in mm³, Tempered at 1025°F; ASTM G65

Thermal Properties	Original Value	Comments
CTE, linear	12.6 µm/m-°C @Temperature 27.0 - 600 °C
Transformation Temperature	857 °C	Ac₁
	913 °C	Ac₃

Component Elements Properties	Original Value	Comments
Carbon, C	0.40 %
Chromium, Cr	4.45 %
Iron, Fe	90.845 - 90.85 %	As Balance
Manganese, Mn	0.45 %
Molybdenum, Mo	2.05 %
Silicon, Si	1.0 %
Sulfur, S	<= 0.0050 %
Vanadium, V	0.80 %

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NCARN14 / 15853

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