CarTech M7 Steel

CarTech M7 Steel

Steel name: CarTech M7
Diagram No.: 2297
UNS designation: T11307
AISI/SAE designation: M7
Chemical composition in weight %: 1.00% C, 0.25% Si, 0.25% Mn, 4.00% Cr, 8.75% Mo, 2.00% V, 1.75% W
Steel group: High speed steels
Properties: CarTech M7 tool steel is an electroslag remelted (ESR) molybdenum-bearing high-speed tool steel with a content of tungsten, chromium and molybdenum similar to that of CarTech M1 tool steel (AISI Type M1).
Applications: Blanking dies, chasers, drills, end mills, form cutters, hobs, lathe tools, milling cutters, planer tools, punches, reamers, shearing blades, slitting saws, taps, thread rolling dies, trimming dies.
Reference: Not shown in this demo version.

Heat Treatment
Hardening: Seven Star tool steel 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 a 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 2150/2225°F (1177/1218°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. The Approximate hardness of Seven Star tool steel as tempered between 1000/1050°F (538/566°C) is Rockwell C 66.
Diagram note: No data

Effect Tempering Temperature on Hardness

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CCT and TTT Diagram Calculating Service
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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.