CarTech Micro-Melt M4 Steel

CarTech Micro-Melt M4 Steel

Steel name: CarTech Micro-Melt M4
Diagram No.: 2313
UNS designation: T11323
AISI/SAE designation: M4
Chemical composition in weight %: 1.45% C, 0.40% Si, 0.40% Mn, max. 0.13% S, 4.50% Cr, 4.50% Mo, 4.00% V, 5.75% W
Steel group: PM high speed steels
Properties: CarTech Micro-Melt M4 alloy is a molybdenum-tungsten powder high speed tool steel containing high carbon and vanadium. This grade possesses very high wear resistance coupled with high strength. Many of the benefits realized in the use of CarTech Micro-Melt powder metals, such as CarTech Micro-Melt M4 alloy, are a direct result of the refined microstructure (smaller, more uniformly distributed carbide particles and a finer grain size) and the lack of segregation in the powder metallurgy product. These advantages include ease of grinding, improved response to heat treatment, greater wear resistance, and increased toughness of the finished tool.
Applications: Lathe tools, planer tools, drills, taps, reamers, broaches, milling cutters, form cutters, thread chasers, hobs, counterbores, insert-heading dies.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Micro-Melt M4 alloy should be heat treated using proper precautions to prevent decarburization. First, preheat to 1400/1500°F (760/816°C), equalize, and transfer to a furnace maintained at the desired hardening temperature. Alternatively, the tool may be preheated in the vacuum furnace which will be used for the austenitizing cycle. Austenitize at 1900/2200°F (1038/1204°C) for 3 - 60 minutes, depending on the austenitizing temperature used. General suggestions for the austenitizing time to be used depending upon the austenitizing temperature chosen are given in the heat treatment table at the end of this section. Quench in oil - and be sure that tools are cooled below 200°F (93°C) before tempering (cool enough to hold in your hand). If a vacuum furnace is used, it should have a 4 bar minimum quench capability. Small sizes under 1" (25.4 mm) in diameter or delicate sections may be hardened by cooling in still air. It is also acceptable to quench in molten salt at temperatures of 1000/1100°F (538/593°C), equalizing for 5 minutes per inch followed by air cooling.
Tempering: Be sure to allow sufficient time for the tool to reach the proper temperature and then start timing the tempering operation. Tools should be tempered immediately after the completion of the quench. For best results with most tools, a range of 1000/1150°F (538/621°C) is suitable. For cutting tools, double or triple temper at 1010/1050°F (543/566°C) where maximum wear resistance is desired.
Diagram note: No data

Effect Tempering Temperature on Hardness

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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.