PROPRIETARY Uddeholm QRO 90 Supreme Tool steels

Material group: Ferrous Alloys / Tool steels
Country / Standard: PROPRIETARY

Data updates

Latest Update: 2016-04
Total number of updates: 1
Update History

This material has 37 properties — only a subset is shown here.

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PROPRIETARY Uddeholm QRO 90 Supreme Chemical Composition

CRITERIA
VALUE
UNIT
CAS NUMBER
CRITERIA
C
VALUE
0.38
UNIT
%
CAS NUMBER
7440-44-0
CRITERIA
Cr
VALUE
2.6
UNIT
%
CAS NUMBER
7440-47-3
CRITERIA
Mn
VALUE
0.75
UNIT
%
CAS NUMBER
7439-96-5
CRITERIA
Mo
VALUE
val1
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UNIT
%
CAS NUMBER
7439-98-7
CRITERIA
Si
VALUE
val1
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UNIT
%
CAS NUMBER
7440-21-3
CRITERIA
V
VALUE
val1
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UNIT
%
CAS NUMBER
7440-62-2

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PROPRIETARY Uddeholm QRO 90 Supreme Physical Properties

Temperature

PROPERTY / VALUE
Modulus of Elasticity
190 — 210 GPa
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Density
val1
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kg/dm³
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Poisson Coefficient
val1
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This material has 37 properties — only a subset is shown here.

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PROPRIETARY Uddeholm QRO 90 Supreme Heat Treatments

  • Soft Annealing
    Protect the steel and heat through to 820°C (1500°F). Then cool in the furnace at 10°C (20°F) per hour to 650°C (1200°F), then freely in air.
    Stress Relieving
    After rough machining the tool should be heated through to 650°C (1200°F), holding time 2 hours. Cool slowly to 500°C (930°F), then freely in air.
    Hardening
    Pre-heating temperature: 600 - 850°C (1110 - 1560°F) normally in two pre-heating steps. Austenitizing temperature: 1020 - 1050°C (1870 - 1920°F).
    Protect the part against decarburization and oxidation during hardening.
    Quenching Media
    High speed gas/circulating atmosphere, vacuum (high speed gas with sufficient positive pressure), an interrupted quench is recommended, martempering bath or fluidized bed at 550°C (1020°F), martempering bath or fluidized bed at 180 - 220°C (360 - 430°F), warm oil.
    Temper the tool as soon as its temperature reaches 50 - 70°C (120 - 160°F). In order to obtain the optimum properties for the tool, the cooling rate should be fast but not at a level that gives excessive distortion or cracks.
    Tempering
    Choose the tempering temperature according to the hardness required. Temper minimum twice with intermediate cooling to room temperature. Lowest tempering temperature 600°C (1110°F). Holding time at temperature minimum 2 hours. To avoid “temper brittleness” do not temper in the range 500 - 600°C (930 - 1110°F).
    Nitriding: Before nitriding, the tool should be hardened and tempered at a temperature minimum 25 - 50°C (50 - 90°F) above the nitriding temperature. Gas nitriding at 510°C (950°F) for 10 h and depth of 0.16 mm or 30 h and depth of 0.27 mm. Plasma nitriding at 480°C (895°F) for 10 h and depth of 0.18 mm or 30 h and depth of 0.27 mm.
    Nitrocarburizing in gas at 580°C (1075°F) for 10 h and depth of 0.18 mm or 30 h and depth of 0.27 mm. In salt bath at 580°C (1075°F) for 1 h and depth of 0.13 mm
  • Austenitizing temperature 1870°F (1020°C). Holding time 30 minutes.

PROPRIETARY Uddeholm QRO 90 Supreme Mechanical Properties

Temperature

PROPERTY / VALUE
Tensile Strength
1250 — 1620 MPa
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Brinell Hardness (HB)
180
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Rockwell Hardness (HR)
val1
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Yield Strength, Rp0.2
1100 — 1400 MPa
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  • -Cross References
  • 6Composition
  • 10Mechanical Properties
  • 13Physical Properties
  • 2Heat Treatment
  • -Metallography
  • -Machinability
  • -Stress-Strain
  • -Formability
  • -Fatigue
  • -Fracture
  • -Creep
  • 2Joints
  • -Coatings
  • -Dimensions
  • -Tribology
  • -Corrosion
  • -Ageing
  • -Weatherability
  • -Irradiation
  • 4Total Suppliers