Assab Steels QRO 90 SUPREME Hot Work Steel

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Assab Steels QRO 90 SUPREME Hot Work Steel
Categories:	Metal; Ferrous Metal; Chrome-moly Steel; Tool Steel; Hot Work Steel
Material Notes:	QRO 90 SUPREME is a high-performance, chromium-molybdenum-vanadium alloyed hot-work tool steel which is characterized by: Excellent high temperature strength and hot hardness Very good temper resistance Resistance to thermal fatigue Excellent thermal conductivity Good toughness and ductility in longitudinal and transverse directions Uniform machinability Good heat treatment properties The name "SUPREME" implies that by special manufacturing techniques, including electro-slag remelting the steel attains high purity and good mechanical properties. The combination of high temperature strength, temper resistance and thermal conductivity exhibited by QRO 90 SUPREME is good. Thus QRO 90 SUPREME has given improved service life in die casting and extrusion of non-ferrous metals and forging and extrusion of steel. Applications: Die casting dies and associated tooling: cores, core pins, inserts, small to medium sized dies, shot sleeves, moving parts for aluminum, brass, and copper die casting. Extrusion dies and extrusion tooling: Dies for simple profiles to be produced in long series requiring more than one die Dies for complicated or thin walled profiles Hollow dies Dies for difficult-to-extrude alloys. For extrusion components: liners, dummy blocks, mandrels and stems. Forging dies: small and medium sized dies for pressforging of steel, and brass. This product is also eminently suitable for progressive forging, upset forging, extrusion forging, powder forging and all processes where heavy water cooling is used.
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Physical Properties	Original Value	Comments

Density	0.281 lb/in³
	0.272 lb/in³ @Temperature 800 °C
	0.277 lb/in³ @Temperature 400 °C

Mechanical Properties	Original Value	Comments
Hardness, Rockwell C	39	holding time 10 hours at 650°C. Austenitizing temperature 1020°C
	39	holding time 100 hours at 600°C. Austenitizing temperature 1020°C
	42	tempering temperature 650°C. Austenitizing temperature 1020°C
	45	tempering temperature 650°C. Austenitizing temperature 1050°C
	47	holding time 1 hour at 650°C. Austenitizing temperature 1020°C
	48	holding time 10 hours at 600°C. Austenitizing temperature 1020°C
	50	holding time 1 hour at 600°C. Austenitizing temperature 1020°C
	50	tempering temperature 350°C. Austenitizing temperature 1020°C
	51	tempering temperature 350°C. Austenitizing temperature 1050°C
	49 - 53	Hardness before tempering. Austenitizing temperature: 1020°C. Soaking time 30 minutes.
	51.5	Average hardness as a function of austenitizing temperature. At 1010°C austenitizing temperature
	50 - 54	Hardness before tempering. Austenitizing temperature: 1050°C. Soaking time 15 minutes.
	52	holding time 1-100 hours at 550°C. Austenitizing temperature 1020°C
	52.5	Average hardness as a function of austenitizing temperature. At 1050°C austenitizing temperature
Hardness, Vickers	325 @Temperature 600 °C	Austenitized 1020°C, tempered 630°C to 48 HRC; holding time at temperature before indentation = 30 minutes.
	475 @Temperature 400 °C	Austenitized 1020°C, tempered 630°C to 48 HRC; holding time at temperature before indentation = 30 minutes.
	540 @Temperature 200 °C	Austenitized 1020°C, tempered 630°C to 48 HRC; holding time at temperature before indentation = 30 minutes.
Tensile Strength at Break	550 MPa @Temperature 700 °C	R_m. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
	1150 MPa @Temperature 550 °C	R_m. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
Tensile Strength, Ultimate	1470 MPa	R_m. 45 HRC.
	1620 MPa	R_m. 48 HRC.
	1250 MPa @Temperature 23.0 °C
Tensile Strength, Yield	1270 MPa	R_p02. 45 HRC.
	1400 MPa	R_p02. 48 HRC.
	350 MPa @Temperature 700 °C	R_p02
	900 MPa @Temperature 500 °C	R_p02. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
	1100 MPa @Temperature 23.0 °C
Elongation at Break	10 % @Temperature 500 °C	austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
	13 % @Temperature 600 °C	austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
	19 % @Temperature 700 °C	austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
Reduction of Area	50 %	500°C. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
	60 % @Temperature 600 °C	austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
	80 % @Temperature 700 °C	austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
Modulus of Elasticity	202.5 GPa
	130 GPa @Temperature 800 °C
	175 GPa @Temperature 400 °C
Impact Test	16.0 J	tempering temperature 400°C. Austenitizing temperature 1020°C.
	20.0 J	tempering temperature 400°C. Austenitizing temperature 1020°C.
	22.0 J	tempering temperature 200°C. Austenitizing temperature 1020°C.

Thermal Properties	Original Value	Comments
CTE, linear	7.00 µm/m-°C @Temperature 20.0 - 400 °C
	7.70 µm/m-°C @Temperature 20.0 - 800 °C
Thermal Conductivity	30.0 W/m-K @Temperature 800 °C
	31.0 W/m-K @Temperature 20.0 °C
	32.0 W/m-K @Temperature 400 °C

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

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NASSAB16 / 15034

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