Tool Steels M7 is stocked by 5 North American distributors and produced by 3 large mills. Distributors will offer small quantity buys while mills will generally only sell large quantities, with delivery times anywhere from 10 to 50 weeks depending on size and form required
This material is stocked primarily in Bar Products by 4 distributors but is also available to a lesser extent in Flat Rolled Products.
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For mill (large volume) production click here
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Specifications
The following specifications cover Tool Steels M7
- ASTM A600 (M-7)
- DIN 1.3348
- UNS T11307
Property Results
Related Metals:
- Vasco M-7(tm)
- Thyrapid 3348(tm)
- Tatmo V(tm)
- Rex M7(tm)
- HS32(tm)
- Seven Star(tm)
Chemistry Data : [top]
Carbon
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0.97 - 1.05 |
Chromium
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3.5 - 4 |
Iron
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Balance |
Manganese
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0.15 - 0.4 |
Molybdenum
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8.2 - 9.2 |
Phosphorus
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0.03 max |
Silicon
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0.2 - 0.55 |
Sulphur
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0.03 max |
Tungsten
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1.4 - 2.1 |
Vanadium
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1.75 - 2.25 |
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Principal Design Features
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M7 is one of the High Speed Tool Steels in the molybdenum alloy family, with tungsten, chromium and vanadium for strengthening. It has good hardenability and is very wear resistant.
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Applications
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M7 is widely used for cutting tools in machining operations.
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Machinability
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Machinability is medium, rating about 60% that of the W group water hardening low alloy tool steels at 100% for comparison.
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Forming
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M7 in the annealed condition may be formed by conventional means.
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Welding
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This is a complex alloy but is weldable. Consult the supplier for procedures and details.
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Heat Treatment
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Preheat at 1450 F and then heat rapidly to 2200 F. Hold parts at 2200 F for 2 to 5 minutes and then salt bath, oil or air quench.
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Forging
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Forging may be done in the range of 2100 F to 1700 F. Do not forge below 1700 F.
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Hot Working
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See "Forging".
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Cold Working
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In the annealed condition M7 may be cold worked by conventional methods.
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Annealing
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Anneal at 1550 to 1600 F and slow cool in furnace at less than 40 F per hour.
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Aging
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Not applicable to this alloy.
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Tempering
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Temper at 1000 F to 1100 F for Rockwell C of 66 to 61. A double temper at the same temperature for one hour each time is preferred.
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Hardening
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See "Heat Treatment" and "Tempering".
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Physical Data : [top]
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Density (lb / cu. in.)
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0.295
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Specific Gravity
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8.17
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Melting Point (Deg F)
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2600
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Modulus of Elasticity Tension
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29
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Mechanical Data : [top]
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MSO currently has no data available for this grade.
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Videos :
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MSO currently has no videos available for this grade.
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Disclaimer
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