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Cobalt High-Speed Steel (M35/M42)
BRAND: PROMISTEEL
GRADES: M35 (5% Co), M42 (8% Co), DIN 1.3243, DIN 1.3247
SHAPES & SIZES: Round Bar (φ2-300mm), Flat Bar, Plate, Wire Rod
DELIVERY CONDITION: EAF+LF+VD+ESR, Annealed, Ground/Peeled
HARDNESS: M35 (≥65 HRC), M42 (≥67 HRC)
RED HARDNESS: Superior (Up to 650°C)
APPLICATION: Aerospace Components, Stainless Steel Drilling, Turbine Blades
MOQ: 25 Tons
Cobalt High Speed Steel, often designated as HSS-E, is a superior class of tool steel enhanced with cobalt (typically 5% to 8%) to achieve exceptional Red Hardness and wear resistance. Unlike standard M2 steel, Cobalt HSS is engineered to maintain its cutting edge at significantly higher temperatures (up to 650°C), making it the material of choice for machining difficult-to-cut materials like stainless steel, titanium alloys, and high-strength steels.
We offer the two most critical grades in this category:
- M35 (W6Mo5Cr4V2Co5): The standard Cobalt HSS with 5% Cobalt, offering a perfect balance of cost, toughness, and heat resistance.
- M42 (W2Mo9Cr4VCo8): A super-hard HSS with 8% Cobalt, designed for maximum hardness (up to 68-70 HRC) and abrasion resistance.
Product Specifications & Grade Equivalents
Our Cobalt HSS is produced using ESR (Electroslag Remelting) technology to ensure high purity and uniform carbide distribution, which is critical for preventing tool breakage under high stress.
Table-1
Cross-reference table for global standards.
International Grade Comparison |
|||||
| Common Name | GB (China) | ASTM / AISI (USA) | DIN (Germany) | JIS (Japan) | ISO |
| M35 (5% Co) | W6Mo5Cr4V2Co5 | M35 | 1.3243 (S6-5-2-5) | SKH55 | HS 6-5-2-5 |
| M42 (8% Co) | W2Mo9Cr4VCo8 | M42 | 1.3247 (S2-10-1-8) | SKH59 | HS 2-9-1-8 |
| T15 | 9W18Cr4V | T15 | 1.3202 | SKH57 | - |
Table-2
Precise Cobalt content defines the performance tier.
Chemical Composition (Mass Fraction %) |
||||||
| Grade | C | W | Mo | Cr | V | Co |
| M35 | 0.80~0.90 | 5.50~6.50 | 4.50~5.50 | 3.75~4.50 | 1.75~2.25 | 4.50~5.50 |
| M42 | 1.05~1.15 | 1.15~1.85 | 9.00~10.00 | 3.50~4.25 | 0.95~1.35 | 7.75~8.75 |
Table-3
Supply Range & Formats |
|
| HSS-E Round Bar | Diameter 2 mm – 300 mm (Precision Ground or Peeled) |
| Flat Bar & Block | Thickness 10 mm–200 mm |
| HSS Wire Rod | For manufacturing drill bits and taps. |
Key Features and Advantages
Superior Red Hardness
The addition of Cobalt raises the steel's melting point and thermal stability. While standard carbon tool steels lose hardness above 200°C, Cobalt HSS retains HRC 60+ hardness even at 500°C-600°C.
Exceptional Surface Hardness
- M35: Typically heat-treated to 65-67 HRC.
- M42: Can achieve 68-70 HRC, offering "Super-Hard" performance for abrasive materials.
High Wear Resistance
Designed to withstand the friction of high-speed cutting without dulling.
Machine Efficiency
Allows for significantly faster cutting speeds and feed rates compared to standard M2 HSS, increasing production efficiency.
Typical Applications
Cobalt High Speed Steel is essential for industries where precision and tool life are paramount:
1
Heavy Duty Cutting Tools
Twist drills, reamers, taps, and milling cutters designed for machining Stainless Steel, Titanium, and Inconel.
2
Aerospace Manufacturing
Production of turbine blades and high-stress components that require tools to maintain precision under extreme heat.
3
Automotive Industry
Used for machining engine parts and high-strength alloys where standard tools would fail rapidly.
4
High-Temperature Bearings
Used in specialized bearing applications requiring resistance to heat and wear.
FAQ
Q1: What is the main difference between M35 and M42 steel?
A1: The key difference is Cobalt content and Hardness. M35 contains ~5% Cobalt and is an excellent all-rounder for stainless steel. M42 contains ~8% Cobalt and higher Molybdenum, making it harder (up to 70 HRC) and better suited for superalloys, though slightly more brittle.
Q2: Can I use M35 for standard steel drilling?
A2: Yes, but it is often overkill. M35 is best utilized when drilling tough materials like 304/316 Stainless Steel, where the heat generated would soften standard M2 drills.
Q3: What does HSS-E mean?
A3: HSS-E is a European designation (often used with DIN standards) indicating High-Speed Steel with Cobalt added (Co > 0%). It is synonymous with Cobalt HSS.
Q4: How does Cobalt improve the steel?
A4: Cobalt dissolves in the steel matrix and increases the "Red Hardness" (thermal stability). This allows the tool to run at higher speeds and temperatures without the cutting edge softening or failing.
Hot Tags: cobalt high-speed steel (m35/m42), China cobalt high-speed steel (m35/m42) manufacturers, suppliers
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