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M35 High-Speed Tool Steel | T1335 | 1.3243 | SKD55
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As a trusted partner in the steel industry, SteelPro Group is committed to providing our customers with premium M35 tool steel, ensuring the best materials for your high-performance needs.
What Is M35 Tool Steel?
M35 tool steel is a high-speed steel (HSS) with molybdenum and cobalt. It is known for its excellent wear resistance, high hardness, and red hardness. Its 8% cobalt content improves heat resistance, making it better than M2 steel for high-performance cutting tools. M35 is widely used for drills, taps, milling cutters, and other precision tools. It offers great toughness and can maintain sharp edges at high temperatures.
Here are the key features of M35 tool steel:
- High Wear Resistance: Excellent abrasion resistance and maintains sharpness.
- High Toughness: Superior resistance to breakage or cracking under heavy loads.
- Excellent Red Hardness: Maintains hardness up to 600°C (1112°F).
- Improved Cutting Performance: Effective performance in high-speed and continuous.
What Is M35 Tool Steel Equivalent To?
The following table presents the standard grade designations for M35 tool steel across various global specifications.
| Standard | Grades |
| ASTM A600 | UNS T11335 |
| GB /T 9943 | W6Mo5Cr4V2Co5 |
| ISO 4957 | HS6-5-2-5 |
| DIN 17350 | 1.3243 / S6-5-2-5 |
| JIS G 4403 | SKH55 |
M35 Steel Products Forms And Supply Range
We offer M35 tool steel products that meet various international standards, including ASTM A600, ISO 4957, and more. Below, you will find the standard product dimensions we provide. We also offer customized sizes to meet your specific project requirements.
Round Bars
Diameter: 10 mm (0.39″) to 300 mm (11.81″).
Length: 3000 mm (118.11″) to 4000 mm (157.48″).
Flat Bars
Thickness: 5 mm (0.20″) to 150 mm (5.91″).
Width: 20 mm (0.79″) to 300 mm (11.81″).
Length: 3000 mm (118.11″) to 4000 mm (157.48″).
Forged Blocks
Thickness:50 mm (1.97″) to 300 mm (11.81″).
Larger sizes on request.
M35 Tool Steel Chemical Composition
Here is an overview of the chemical makeup of M35 tool steel:
| Element | Composition (%) |
| Carbon (C) | 0.82 – 0.88 |
| Chromium (Cr) | 3.75 – 4.0 |
| Cobalt (Co) | 4.5 – 5.5 |
| Copper (Cu) | ≤ 0.25 |
| Iron (Fe) | 73.7 – 78.8, as balance |
| Manganese (Mn) | 0.15 – 0.40 |
| Molybdenum (Mo) | 4.5 – 5.5 |
| Nickel (Ni) | ≤ 0.30 |
| Phosphorus (P) | ≤ 0.030 |
| Silicon (Si) | 0.20 – 0.45 |
| Sulfur (S) | ≤ 0.030 |
| Tungsten (W) | 5.5 – 6.75 |
| Vanadium (V) | 1.75 – 2.2 |
- Sulfur (S) content may be specified from 0.06% to 0.15% to improve machinability.
M35 Tool Steel Physical Properties
Here is an overview of the physical properties of M35 steel:
| Property | Metric (SI) | Imperial |
| Density | 8.14 g/cc | 0.294 lb/in³ |
| Thermal Conductivity | 29 W/m·K | 17 BTU/h·ft·°F |
| CTE | 11.4 – 11.5 µm/m·K | 6.33 – 6.39 × 10⁻⁶ in/in·°F |
| Melting Point | 1,400°C | 2,552°F |
| Specific Heat Capacity | 0.46 J/g·K | 0.11 BTU/lb·°F |
M35 Tool Steel Mechanical Properties
Here is a summary of the mechanical properties of M35 tool steel
| Mechanical Property | Metric | Imperial | Notes |
| Hardness (HRC) | 64.8 HRC | 64.8 HRC | Quenching from 1232°C for 5 min by oil |
| 65.2 HRC | 65.2 HRC | Quenching from 1177°C for 5 min by oil | |
| 65.2 HRC | 65.2 HRC | Quenching from 1204°C for 5 min by oil | |
| Modulus of Elasticity | 207 GPa | 30,000 ksi | – |
| Machinability | 45 – 50 % | 45 – 50 % | – |
M35 Tool Steel Forging
Preheating: Heated to 450°C – 500°C (842°F – 932°F).
Forging: Rapidly heat M35 to a forging temperature of 950°C – 1100°C (1742°F – 2012°F).
Post-Forge Cooling: After the forging process, M35 tool steel must be cooled very slowly to ensure no thermal shock
M35 Tool Steel Heat Treatment
At SteelPro Group, we offer M35 tool steel in the annealed state, making it easier for your machining processes. If you require pre-hardened or hardened options, feel free to contact us for more details.
Soft Annealing – Relieves Internal Stresses & Improves Machinability
Heat M35 tool steel to a temperature between 850°C and 900°C (1560°F and 1650°F). After reaching the target temperature, cool the steel slowly at a rate of 10°C / 18°F per hour until it reaches 700°C (1290°F). This process results in a maximum hardness of 260 Brinell.
Stress Relieving – Reduces Internal Stresses After Machining
Heat the steel to 600°C to 700°C (1120°F to 1290°F) and hold it for approximately 2 hours. Afterward, allow the steel to cool slowly to 500°C (930°F).
Hardening – Increases Hardness & Wear Resistance
For complex-shaped parts, heat the steel to 450°C to 500°C (840°F to 930°F), and then heat it to 850°C to 900°C (1560°F to 1650°F). For simple-shaped parts, the steel can be directly preheated to 850°C to 900°C (1560°F to 1650°F).
After preheating, austenitize the steel by heating it to a temperature range of 1050°C to 1220°C (1920°F to 2230°F). The steel is then quenched to around 550°C (1022°F) and allowed to cool in the air until it reaches a hand-warm temperature.
Tempering
After hardening, temper the steel by heating it to 560°C (1040°F) or higher. The steel should be tempered twice, with each tempering lasting for at least 1 hour at the full temperature.
M35 Tool Steel Machining
M35 tool steel is highly machinable, but it requires careful attention during the process due to its high hardness and wear resistance.
Machining M35 steel requires the use of high-quality cutting tools, often made from carbide or high-speed steel. Cutting speeds should be moderate to high, and appropriate cooling (using oils or coolants) is essential to prevent overheating.
For drilling or tapping, specialized drills and taps designed for hardened materials should be used.
M35 Tool Steel Applications
M35 tool steel is widely used in a variety of applications due to its excellent hardness and wear resistance. Here are the common uses:
Cutting Tools
- Drills
- End Mills
- Taps
Mold and Die Making
- Injection Molds
- Die-casting Dies
Cutting Blades
- Slitting Blades
- Circular Saws
Cold Work Tools
- Shear Blades
- Knives and Blades
Wear Parts
- Screwdrivers
- Wear-resistant Components
Reliable M35 Tool Steel Solutions for Your Business
At SteelPro Group, we bring over 10 years of experience in manufacturing tool steels and have worked with hundreds of satisfied clients worldwide. We specialize in providing M35 tool steel, along with essential services like grinding, surface finishing, and custom size options to meet your specific needs.
If you need other materials for different projects, we can also offer other products like D2 tool steel, structure steel, and stainless steel.
