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Mat.No. 1.3348/DIN S2-9-2/EN HS2-9-2/AISI M7

Designation by Standards Mat. No. DIN EN AISI 1.3348 S2-9-2 HS2-9-2 M7 Chemical Composition (in weight %) C Si Mn Cr Mo Ni V W Others 0.98 max. 0.70 max. 0.40 4.00 8.70 - 1.95 1.80 - Description 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. Very high resistance to softening at elevated temperatures and good toughness.
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  • Mat.No. 1.3348/DIN S2-9-2/EN HS2-9-2/AISI M7

Mat.No. 1.3348/DIN S2-9-2/EN HS2-9-2/AISI M7


Designation by Standards

Mat. No.DINENAISI
1.3348S2-9-2HS2-9-2M7


Chemical Composition (in weight %)

CSiMnCrMoNiVWOthers
0.98max. 0.70max. 0.404.008.70-1.951.80-


Description
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, wear resistant and very high resistance to softening at elevated temperatures, good toughness and deep hardening response.

Applications
M7 is widely used for cutting tools in machining operations, such as sendzimir rolls, segment and circular cutters, profile cutting tools, thread cutting drills and cold forming tools.

Physical properties (avarage values) at ambient temperature
Modulus of elasticity [103 x N/mm2]: 217
Density [g/cm
3]: 8.30
Thermal conductivity [W/m.K]: 19.0
Electric resistivity [Ohm mm
2/m]: 0.65
Specific heat capacity [J/g.K]: 0.46


Coefficient of Linear Thermal Expansion 10-6 oC-1

20-100oC20-200oC20-300oC20-400oC20-500oC20-600oC20-700oC
11.712.512.913.213.413.413.4

Continuous Cooling Transformation (CCT) Diagram
Click the image to enlarge the diagram.


Time-Temperature Transformation (TTT) Diagram
Click the image to enlarge the diagram.

Soft Annealing
Heat to 820-880oC, cool slowly in furnace. This will produce a maximum Brinell hardness of 230-280.

Hardening
Heat up to 450-600oC, preheat to 850oC and then to 1050oC. Harden from a temperature of 1180-1220oC followed by oil, air quenching or warm bath at 550oC. Hardness after quenching is 64-66 HRC.

Tempering
Tempering temperature: 3 x 1 hour at 540-560oC. Hardness after tempering is min 64 HRC.

Forging
Hot forming temperature: 1100-900oC.

Cold Working
In the annealed condition M7 may be cold worked by conventional methods.

Machinability
Machinability is medium, rating about 60% that of the W group water hardening low alloy tool steels at 100% for comparison.

Corrosion Resistance
Although this alloy contains chromium and molybdenum, it is still a steel and thus will corrode. It should be protected from rusting.

Welding
This is a complex alloy but is weldable. Consult the supplier for procedures and details.

Forms manufactured
Please see the Dimensional Sales Program.

Disclaimer
The information and data presented herein are typical or average values and are not a guarantee of maximum or minimum values. The specifically suggested applications 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 purposes. There is no representation that the recipient of this literature will receive updated editions as it become available.


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