Bohler-Uddeholm UDDEHOLM QRO® 90 SUPREME Hot Work Tool Steel

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Bohler-Uddeholm UDDEHOLM QRO® 90 SUPREME Hot Work Tool Steel
Categories:	Metal; Ferrous Metal; Alloy Steel; Chrome-moly Steel; Tool Steel; Hot Work Steel
Material Notes:	Chromium-molybdenum-vanadium alloyed steel QRO® 90 SUPREME is a premium hot work die steel with high hot yield strength and very good temper resistance. Especially suited for die casting of aluminum, copper and brass. QRO® 90 SUPREME is characterized by: Excellent high temperature strength and hot hardness Very good temper resistance Unique resistance to thermal fatigue Excellent thermal conductivity Good toughness and ductility in longitudinal and transverse directions Uniform machinability Good heat treatment properties Applications: Die Casting Dies and Associated Tooling, Extrusion dies and Extrusion Tooling and Forging dies
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Physical Properties	Original Value	Comments

Density	0.281 lb/in³	hardness of 45 HRC
	0.274 lb/in³ @Temperature 599 °C	hardness of 45 HRC
	0.277 lb/in³ @Temperature 399 °C	hardness of 45 HRC

Mechanical Properties	Original Value	Comments
Hardness, Brinell	180	Soft annealed (Delivery condition)
Tensile Strength, Ultimate	181000 psi	hardness of 40 HRC
	213000 psi	hardness of 45 HRC
	235000 psi	hardness of 48 HRC
Tensile Strength, Yield	160000 psi @Strain 0.2 %	hardness of 40 HRC
	184000 psi @Strain 0.2 %	hardness of 45 HRC
	203000 psi @Strain 0.2 %	hardness of 48 HRC
Modulus of Elasticity	30500 ksi	(hardness of 45 HRC)
	20300 ksi @Temperature 599 °C	hardness of 45 HRC
	26100 ksi @Temperature 399 °C	hardness of 45 HRC
Charpy Impact	13.0 ft-lb @Temperature 98.9 °C	V-notch
	35.0 ft-lb @Temperature 599 °C	V-notch

Thermal Properties	Original Value	Comments
CTE, linear	7.00 µin/in-°F @Temperature 399 °C	hardness of 45 HRC
	7.30 µin/in-°F @Temperature 599 °C	hardened to 45 HRC
Thermal Conductivity	33.0 W/m-K @Temperature 399 °C	hardness of 45 HRC
	33.0 W/m-K @Temperature 599 °C	hardness of 45 HRC

Processing Properties	Original Value	Comments
Processing Temperature	1885 °F	heated for 30 min, then quenched in air and tempered 2 + 2 h at 1190°F (hardness = 45 HRC)

Component Elements Properties	Original Value	Comments
Carbon, C	0.38 %
Chromium, Cr	2.6 %
Iron, Fe	92.82 %	As Balance
Manganese, Mn	0.75 %
Molybdenum, Mo	2.25 %
Silicon, Si	0.30 %
Vanadium, V	0.90 %

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NBUCOR04 / 15473

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