QRO 90 Supreme Steel

QRO 90 Supreme Steel

Steel name: QRO 90 Supreme
Diagram No.: 2741
Chemical composition in weight %: 0.38% C, 0.30% Si, 0.75% Mn, 2.60% Cr, 2.25% Mo, 0.90% V
Steel group: Hot work tool steels
Properties: Uddeholm QRO 90 Supreme is a high-performance, chromium-molybdenum-vanadium alloyed hot work tool steel
Applications: Die casting dies and associated tooling. Extrusion dies and extrusion tooling. Forging dies.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Pre-heating temperature: 600–850°C (1110– 1560°F) normally in two pre-heating steps. Austenitizing temperature: 1020–1050°C (1870– 1920°F). Quenching media: High speed gas/circulating atmosphere. Vacuum (high speed gas with sufficient positive pressure). An interrupted quench is recommended where distortion control and quench cracking are a concern. Martempering bath or fluidized bed at 450– 550°C (840–1020°F), then cool in air. Martempering bath or fluidized bed at 180–220°C (360–430°F) then cool in air. Warm oil.
Tempering: Choose the tempering temperature according to the hardness required by reference to the tempering graph. 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).
Diagram note: Air cooling of specimens 25 x 25 x 40 mm (1" x 1" x 1 1/2"). Larger sections, which contain bainite after hardening, are characterized by a lower initial hardness and displacement of the secondary hardening peak to higher temperatures. During overtempering, however, the curves are more or less identical from about 45 HRC down, irrespective of section size.

Tempering Diagram

Price: 20.00 US $
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Other Steel Data links
Carbides in Steel
CCT and TTT Diagrams of Steels
CCT and TTT Diagram Calculating Service
Hardenability Diagrams of Steels
Hardenability Calculating Service
Macro Defects in Steel
Metal Etchants
Non-Metallic Inclusions in Steel
Semiconductor Etchants

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