CarTech M4 Steel

Steel name: CarTech M4
Diagram No.: 2296
UNS designation: T11304
AISI/SAE designation: M4
Chemical composition in weight %: 1.30% C, 0.30% Si, 0.30% Mn, 4.50% Cr, 4.50% Mo, 4.00% V, 5.50% W
Steel group: High speed steels
Properties: CarTech M4, a molybdenum-tungsten high-speed tool steel possessing high carbon and vanadium content, provides a very high degree of wear resistance coupled with high strength.
Applications: Lathe tools, planer tools, drills, taps, reamers, broaches, milling cutters, form cutters, thread chasers, hobs, counterbores, inserts-heading dies.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Four Star should be heat treated from neutral salt baths or properly adjusted controlled atmosphere furnaces. A dew point of +10°F (-12°C) is suggested for the high-heat furnace when using controlled atmosphere. First, preheat to 1400/1500°F (760/816°C), then transfer to a superheating furnace with a temperature maintained at 2200/2225°F (1204/1218°C). When neutral salt baths are used for hardening, the temperature should be dropped 25°F (14°C) as compared to other furnace temperatures.
Tempering: Be sure to allow sufficient time for the tools 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 1000/1200°F (538/649°C) is suitable. For cutting tools, double or triple temper at 1000/1050°F (538/566°C) where maximum wear resistance is desired.
Diagram note: No data

Effect Tempering Temperature on Hardness

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