CarTech Micro-Melt 20-4 Steel

CarTech Micro-Melt 20-4 Steel

Steel name: CarTech Micro-Melt 20-4
Diagram No.: 2304
Chemical composition in weight %: 1.90% C, 0.60% Si, 0.35% Mn, 20.00% Cr, 1.00% Mo, 4.00% V, 0.65% W
Steel group: Martensitic cold work tool steels
Properties: The unique combination of wear resistance, toughness, polishability and corrosion resistance makes CarTech Micro-Melt 20-4 alloy an excellent candidate material for plastic compounding and injection feed screws and screw segments, barrel liners, screw tips, backflow check valves and mold cavities, particularly when processing plastics resins that contain abrasive and/or corrosive fillers and particulates. Other potential applications include pelletizer, granulator and high-performance industrial and custom knives as well as food processing equipment. In severe applications requiring toughness and good wear and corrosion resistance, CarTech Micro-Melt 20-4 alloy can reduce tooling requirements by as much as 75% compared to conventional tooling.
Applications: CarTech Micro-Melt 20-4 alloy is a highly wear and corrosion resistant, air hardening martensitic cold-work stainless die steel produced using Carpenter's powder metallurgy (P/M) process. The excellent wear resistance of the alloy is provided by a significant volume fraction of hard vanadium-rich carbides, while the alloy's outstanding corrosion resistance is obtained as a result of the chromium-rich matrix. The application of Carpenter's P/M processing creates a segregation-free and homogeneously fine carbide and grain size distribution, and when coupled with the use of molten metal filtration, results in improved cleanliness and toughness compared to conventionally cast and wrought processed material. CarTech Micro-Melt 20-4 alloy's uniform microstructure, fine carbide distribution, cleanliness and high chromium content, is responsible for the material's excellent combination of wear resistance, toughness, polishability and corrosion resistance.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: As mentioned above, Micro-Melt 20-4 alloy can be heat treated in salt, vacuum, or controlled atmosphere furnaces, with precautions being taken to avoid decarburization during the heat treatment operation. Preheat to 1400/1450°F (760/788°C) and equalize. After preheating, rapidly heat to 1950/2100°F (1066/1149°C) when using salt or atmosphere controlled furnaces and 2050/2150°F (1121/1177°C) when using vacuum furnaces. Austenitizing at the low end of this temperature range will maximize toughness at the expense of wear resistance, while the reverse will occur when austenitizing at the high end of this range. Soak at the austenitizing temperature for 30 minutes and then quench.
Tempering: Tools should be tempered immediately after completion of quenching or after completion of quenching and the cryogenic treatment. The typical tempering range for this alloy is 400 to 750°F (204 to 399°C). Tools should be soaked at temperature for the greater of 1 hour per inch (25.4 mm) of thickness or 2 hours minimum, and then cooled to room temperature in still air. The typical working hardness for the alloy is 57/59 HRC; however, a higher working hardness of 62/63 HRC can be used to enhance the material's wear resistance at the expense of corrosion resistance and toughness. Parts should never be tempered between 800 and 1100°F (427/583°C) since both the corrosion resistance and toughness will be severely degraded due to excessive carbide precipitation.
Diagram note: No data

Tempering Diagram

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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

Disclaimer: The material data is a central depository of information based on global actual tests and calculated software data that is available to the public for a fee. The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. Applications specifically suggested for material described herein are made solely for the purpose of illustration to enable the reader to make his own evaluation and are not intended as warranties, either express or implied, of fitness for these or other puposes. There is no representation that the recipient of this literature will receive updated editions as the become available.