Toolman Special Steels is proud to produce and offer M7 (1.3348) - M7 is one of the molybdenum alloy high speed tool steels and contains tungsten, chromium and vanadium for better strength. It has good hardenability and superior wear resistance. M7 is widely used in the cutting tools, cutting drills, and cold forming tools for machining operations.
Steel Properties
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High hardness after quenching and tempering
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High wear resistance and cutting ability
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Good grindability
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High impact resistance
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Edge Stability
Chemical Composition
| Element | Value |
|---|---|
| C | 0.97 |
| Cr | 3.00 |
| Mo | 8.20 |
| W | 1.40 |
| Co | - |
| V | 1.75 |
Mechanical Properties
| Property | Value |
|---|---|
| Hardness (HBW) | 255 max (Annealed) |
| Quenching and Tempering Hardness (HRC) | 65 min |
Physical Properties
| Property | Value |
|---|---|
| Density (g/cm³) | 7.9 |
Modulus of Elasticity
| Temperature (°C) | kN/mm² |
|---|---|
| 20 | 217 |
Thermal Properties
| Temperature (℃) | Thermal Expansion Coefficient (10^-6/℃) |
|---|---|
| 20-00 | 11.7 |
| 20-500 | 13.4 |
Thermal Conductivity
| Temperature (℃) | Thermal Conductivity (W/m•K) |
|---|---|
| 20 | 19 |
HEAT TREATMENT AND PROCESSES
Heat treatment
| Heat Treatment Process | Temperature (°C) | Details |
|---|---|---|
| Annealing | 850-900 | Heat uniformly, hold until soaked, cool slowly in furnace. |
| Stress Relieving | 600-700 | Heat to specified temperature, hold for 2 hours, then air cool. |
| Hardening (Step 1) | 450 - 500 | Preheat uniformly, hold until soaked. |
| Hardening (Step 2) | 850 - 900 | Heat uniformly, hold until soaked, quench in oil, salt bath, or air. Austenitise at a temperature suitable for chosen working hardness. |
| Tempering | 540-600 | Reheat, hold for at least one hour per inch of thickness, air cool. |
Applications
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Cutting tools in machining operations
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Sendzimir rolls
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Segment and circular cutters
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Profile cutting tools
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Thread cutting drills
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Cold forming tools
Cold forming mold (screw mold, header punch, die)
Quality Assurance
Our M7 1.3348 steel undergoes rigorous testing and quality control to meet international standards, ensuring consistent performance and reliability. Certificates and test reports are available upon request. Feel free to reach out to us for more information on our M7 1.3348 steel products or to discuss your specific requirements. We're dedicated to providing top-quality steel solutions that meet your needs and exceed your expectations.
Manufacturing Range
| ROUNDS | SQUARES | ||
|---|---|---|---|
| SIZE (MM) | CONDITION | SIZE (MM) | CONDITION |
| 6.00 - 14.00 | CG | 7.2, 8.8, 10.5, 11 | HRA |
| 15.00 - 50.00 | HRAP | 13.5, 14, 17.5, 21 | HRA |
| 52.00 - 405.00 | FAT | 27, 32, 40 | HRA |
| 52.00 - 305.00 | FA |
Flats
| THICKNESS | WIDTH | CONDITION |
|---|---|---|
| 5.00 - 32.00 | 21.00 - 105.00 | HRA |
| 32.00 - 105.00 | 40.00 - 205.00 | FA |
Frequently Asked Questions
M7 / DIN 1.3348 / AISI M7 is a molybdenum-alloy high speed tool steel containing tungsten, chromium and vanadium. Toolman describes the grade as having good hardenability, superior wear resistance, high hardness after quenching and tempering, good grindability, high impact resistance and edge stability.
We supply M7 for cutting tools used in machining operations, Sendzimir rolls, segment and circular cutters, profile cutting tools, thread-cutting drills and cold-forming tools. It is also used for cold-forming mould applications including screw moulds, header punches and dies.
Our published maximum annealed hardness is 255 HBW for M7 and a minimum quenching-and-tempering hardness is 65 HRC. The grade is specifically identified for high hardness after quenching and tempering together with high wear resistance and cutting ability.
We specify annealing at 850–900°C and stress relieving at 600–700°C, with a two-hour hold for stress relieving followed by air cooling. Hardening includes preheating at 450–500°C and 850–900°C, followed by quenching as specified. Tempering is carried out at 540–600°C.
Our published chemical composition include M7 with 0.97% carbon, 3.00% chromium, 8.20% molybdenum, 1.40% tungsten and 1.75% vanadium.
We supply M7 rounds in 6–14 mm, 15–50 mm and 52–405 mm ranges, depending on condition. Square sizes include 7.2, 8.8, 10.5, 11, 13.5, 14, 17.5, 21, 27, 32 and 40 mm, along with forged-annealed squares from 52–305 mm.
Yes. Our M7 / 1.3348 steel undergoes testing and quality control and certificates and test reports are available upon request. Manufacturers can also contact Toolman to discuss specific M7 material and application requirements.
