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Assab Steels QRO 90 SUPREME Hot Work Steel

Category Metal , Ferrous Metal , Chrome-moly Steel , Tool Steel , Hot Work Steel
Manufacturer Assab Steels
Trade Name
Port Ningbo port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
Download PDF Assab Steels QRO 90 SUPREME Hot Work Steel.pdf
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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 hardnessVery good temper resistanceResistance to thermal fatigueExcellent thermal conductivityGood toughness and ductility in longitudinal and transverse directionsUniform machinabilityGood 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 dieDies for complicated or thin walled profilesHollow diesDies 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.
Physical Properties Metric English Comments
Density 7.78 g/cc
0.281 lb/in³
7.53 g/cc

@Temperature 800 °C
0.272 lb/in³

@Temperature 1470 °F
7.67 g/cc

@Temperature 400 °C
0.277 lb/in³

@Temperature 752 °F
Mechanical Properties Metric English Comments
Hardness, Rockwell C 39
39
holding time 10 hours at 650°C. Austenitizing temperature 1020°C
39
39
holding time 100 hours at 600°C. Austenitizing temperature 1020°C
42
42
tempering temperature 650°C. Austenitizing temperature 1020°C
45
45
tempering temperature 650°C. Austenitizing temperature 1050°C
47
47
holding time 1 hour at 650°C. Austenitizing temperature 1020°C
48
48
holding time 10 hours at 600°C. Austenitizing temperature 1020°C
50
50
holding time 1 hour at 600°C. Austenitizing temperature 1020°C
50
50
tempering temperature 350°C. Austenitizing temperature 1020°C
51
51
tempering temperature 350°C. Austenitizing temperature 1050°C
49 - 53
49 - 53
Hardness before tempering. Austenitizing temperature: 1020°C. Soaking time 30 minutes.
51.5
51.5
Average hardness as a function of austenitizing temperature. At 1010°C austenitizing temperature
50 - 54
50 - 54
Hardness before tempering. Austenitizing temperature: 1050°C. Soaking time 15 minutes.
52
52
holding time 1-100 hours at 550°C. Austenitizing temperature 1020°C
52.5
52.5
Average hardness as a function of austenitizing temperature. At 1050°C austenitizing temperature
Hardness, Vickers 325

@Temperature 600 °C
325

@Temperature 1110 °F
Austenitized 1020°C, tempered 630°C to 48 HRC; holding time at temperature before indentation = 30 minutes.
475

@Temperature 400 °C
475

@Temperature 752 °F
Austenitized 1020°C, tempered 630°C to 48 HRC; holding time at temperature before indentation = 30 minutes.
540

@Temperature 200 °C
540

@Temperature 392 °F
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
79800 psi

@Temperature 1290 °F
R<sub>m</sub>. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
1150 MPa

@Temperature 550 °C
167000 psi

@Temperature 1020 °F
R<sub>m</sub>. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
Tensile Strength, Ultimate 1470 MPa
213000 psi
R<sub>m</sub>. 45 HRC.
1620 MPa
235000 psi
R<sub>m</sub>. 48 HRC.
1250 MPa

@Temperature 23.0 °C
181000 psi

@Temperature 73.4 °F
Tensile Strength, Yield 1270 MPa
184000 psi
R<sub>p</sub>02. 45 HRC.
1400 MPa
203000 psi
R<sub>p</sub>02. 48 HRC.
350 MPa

@Temperature 700 °C
50800 psi

@Temperature 1290 °F
R<sub>p</sub>02
900 MPa

@Temperature 500 °C
131000 psi

@Temperature 932 °F
R<sub>p</sub>02. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
1100 MPa

@Temperature 23.0 °C
160000 psi

@Temperature 73.4 °F
Elongation at Break 10 %

@Temperature 500 °C
10 %

@Temperature 932 °F
austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
13 %

@Temperature 600 °C
13 %

@Temperature 1110 °F
austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
19 %

@Temperature 700 °C
19 %

@Temperature 1290 °F
austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
Reduction of Area 50 %
50 %
500°C. austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
60 %

@Temperature 600 °C
60 %

@Temperature 1110 °F
austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
80 %

@Temperature 700 °C
80 %

@Temperature 1290 °F
austenitized 1020°C, tempered 630°C to 48 HRC. Holding time = 30 minutes.
Modulus of Elasticity 202.5 GPa
29370 ksi
130 GPa

@Temperature 800 °C
18900 ksi

@Temperature 1470 °F
175 GPa

@Temperature 400 °C
25400 ksi

@Temperature 752 °F
Impact Test 16.0 J
11.8 ft-lb
tempering temperature 400°C. Austenitizing temperature 1020°C.
20.0 J
14.8 ft-lb
tempering temperature 400°C. Austenitizing temperature 1020°C.
22.0 J
16.2 ft-lb
tempering temperature 200°C. Austenitizing temperature 1020°C.
Thermal Properties Metric English Comments
CTE, linear 7.00 µm/m-°C

@Temperature 20.0 - 400 °C
3.89 µin/in-°F

@Temperature 68.0 - 752 °F
7.70 µm/m-°C

@Temperature 20.0 - 800 °C
4.28 µin/in-°F

@Temperature 68.0 - 1470 °F
Thermal Conductivity 30.0 W/m-K

@Temperature 800 °C
208 BTU-in/hr-ft²-°F

@Temperature 1470 °F
31.0 W/m-K

@Temperature 20.0 °C
215 BTU-in/hr-ft²-°F

@Temperature 68.0 °F
32.0 W/m-K

@Temperature 400 °C
222 BTU-in/hr-ft²-°F

@Temperature 752 °F
Component Elements Properties Metric English Comments
Carbon, C 0.38 %
0.38 %
Chromium, Cr 2.6 %
2.6 %
Iron, Fe 92.82 %
92.82 %
Manganese, Mn 0.75 %
0.75 %
Molybdenum, Mo 2.25 %
2.25 %
Silicon, Si 0.30 %
0.30 %
Vanadium, V 0.90 %
0.90 %
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