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	Metric	English	Comments

Density	7.78 g/cc	0.281 lb/in³	hardness of 45 HRC
	7.58 g/cc @Temperature 599 °C	0.274 lb/in³ @Temperature 1110 °F	hardness of 45 HRC
	7.67 g/cc @Temperature 399 °C	0.277 lb/in³ @Temperature 750 °F	hardness of 45 HRC

Mechanical Properties	Metric	English	Comments
Hardness, Brinell	180	180	Soft annealed (Delivery condition)
Tensile Strength, Ultimate	1250 MPa	181000 psi	hardness of 40 HRC
	1470 MPa	213000 psi	hardness of 45 HRC
	1620 MPa	235000 psi	hardness of 48 HRC
Tensile Strength, Yield	1100 MPa @Strain 0.2 %	160000 psi @Strain 0.2 %	hardness of 40 HRC
	1270 MPa @Strain 0.2 %	184000 psi @Strain 0.2 %	hardness of 45 HRC
	1400 MPa @Strain 0.2 %	203000 psi @Strain 0.2 %	hardness of 48 HRC
Modulus of Elasticity	210 GPa	30500 ksi	(hardness of 45 HRC)
	140 GPa @Temperature 599 °C	20300 ksi @Temperature 1110 °F	hardness of 45 HRC
	180 GPa @Temperature 399 °C	26100 ksi @Temperature 750 °F	hardness of 45 HRC
Charpy Impact	17.6 J @Temperature 98.9 °C	13.0 ft-lb @Temperature 210 °F	V-notch
	47.5 J @Temperature 599 °C	35.0 ft-lb @Temperature 1110 °F	V-notch

Thermal Properties	Metric	English	Comments
CTE, linear	12.6 µm/m-°C @Temperature 399 °C	7.00 µin/in-°F @Temperature 750 °F	hardness of 45 HRC
	13.1 µm/m-°C @Temperature 599 °C	7.30 µin/in-°F @Temperature 1110 °F	hardened to 45 HRC
Thermal Conductivity	33.0 W/m-K @Temperature 399 °C	229 BTU-in/hr-ft²-°F @Temperature 750 °F	hardness of 45 HRC
	33.0 W/m-K @Temperature 599 °C	229 BTU-in/hr-ft²-°F @Temperature 1110 °F	hardness of 45 HRC

Processing Properties	Metric	English	Comments
Processing Temperature	1029 °C	1885 °F	heated for 30 min, then quenched in air and tempered 2 + 2 h at 1190°F (hardness = 45 HRC)

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

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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NBUCOR04 / 15473

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