Corten Steel Plate
Atmospheric corrosion resistant plate that builds its own protective rust instead of paint
Specifications
Alloy Steel Sheet
M35 Cobalt High Speed Steel for Cutting Tools
Molybdenum cobalt tool steel also listed as W6Mo5Cr4V2Co5 1.3243 and SKH55
M35 is a molybdenum based high speed tool steel with a cobalt addition, catalogued in China as W6Mo5Cr4V2Co5 and elsewhere as 1.3243, HS6-5-2-5 and SKH55. Cutting tool producers specify it for drills, reamers, gear cutters, broaches and die steel because the 5% cobalt keeps the edge hard while it is running hot, which M2 cannot do. It is the grade most shops reach for when M2 is failing on heat but solid carbide is too expensive to blank and regrind, and it stays the most widely used high speed steel because of that balance. Stock covers 0-1000mm thickness in annealed or quenched and tempered condition.
- Product Name — High speed steel
- Grade — M35 1.3243 HS6-5-2-5 SKH55 W6Mo5Cr4V2Co5
- Thickness — 0-1000mm
- Size — Customized size
- Technique — Annealed quenched and tempered
Why It Is Specified
Key Benefits of M35 high speed steel
Cobalt Where M2 Runs Out Of Heat
The 5% cobalt content is the single difference that carries this grade past M2 in hot cutting. Edges that were softening in dry drilling keep working.
Working Hardness Of 64-66 HRC
After heat treatment the grade generates 64-66 HRC. Tool makers plan grinding stock and tempering cycles against that figure.
Tensile Strength With Wear Resistance
M35 combines high tensile strength with wear resistance, so a long slender tool resists both bending and abrasion in the same cut.
Fine Evenly Spread Carbides
The carbides in this conventional steel are small and evenly distributed, giving a clean ground edge rather than one that breaks out along a carbide stringer.
Widely Stocked and Economically Priced
M35 is the most commonly used high speed steel grade, which keeps it available and keeps replacement tooling cheaper than exotic alternatives.
Blank Sizes Instead Of Standard Plate
Thickness runs to 1000mm and size is cut to your requirement, so the blank arrives near the finished tool dimension.
Problems It Solves
What This Material Removes From Your Process
Tool Life Collapsing In Dry Or Hot Cutting
M2 tooling softens once the edge temperature climbs. Moving to M35 brings 5% cobalt and the red hardness that goes with it into the same tool geometry.
Carbide Cost On Short Production Runs
Solid carbide is hard to justify when the tool is a special made in small numbers. M35 can be cut punched welded and reground with normal tool room equipment.
Inconsistent Edge Quality After Grinding
Coarse carbide distribution shows up as chipped ground edges. The carbides in this grade are small and evenly distributed through the section.
Grade Names That Do Not Match Across Regions
M35 1.3243 HS6-5-2-5 SKH55 and W6Mo5Cr4V2Co5 all describe this steel. Certifying against the names on your drawing prevents a hold at goods inward.
Paying To Machine Away Expensive Alloy
Buying oversize stock means cutting an alloyed steel into chips. Cut to size blanks with milling or grinding reduce what has to be removed.
Application Scenarios
Where It Is Used
Drill Production Lines
Twist drill manufacture where dry holes and interrupted entry put the whole cutting load on edge retention.
Reamer and Tap Manufacture
Finishing tools whose accuracy depends on the edge keeping its geometry across a long production run.
Gear Cutter and Broach Making
Multi tooth tools where regrinding a worn profile is expensive and edge life directly drives tool cost per part.
Die Steel Applications
Cold work die components listed for this grade where abrasion resistance is the governing property.
Replacement Tooling For Machine Shops
Shops remaking specials in house and needing a grade that outperforms M2 without moving to carbide.
Who It Is For
Buyers Who Specify This Product
- Cutting tool factories buying M35 blanks for drills taps and reamers
- Production engineers upgrading from M2 tooling that is failing on cutting heat
- Die shops specifying cobalt high speed steel for cold work die components
- Machine shop owners remaking special tools rather than buying replacements
- Tool steel importers stocking M35 under its W6Mo5Cr4V2Co5 and SKH55 names
- Procurement teams sourcing an economically priced alternative to solid carbide blanks
Technical Data
Specifications and Technical Features
Values below come from the product data published by Shandong Tianyu Metal Products. Confirm the exact grade and size against your order.
| Product Name | High speed steel |
|---|---|
| Grade | M35 1.3243 HS6-5-2-5 SKH55 W6Mo5Cr4V2Co5 |
| Thickness | 0-1000mm |
| Size | Customized size |
| Technique | Annealed quenched and tempered |
| Application | Manufacturing various cutting tools |
| Hardness After Heat Treatment | 64-66 HRC |
| Carbon C | 0.82-0.95 |
| Tungsten W | 5.50-6.50 |
| Chromium Cr | 3.80-4.50 |
| Molybdenum Mo | 4.75-5.25 |
| Vanadium V | 1.75-2.15 |
| Phosphorus P and Sulphur S | 0.030 maximum each |
| Place of Origin | China |
Technical Features
- Grade M35 with equivalents 1.3243 HS6-5-2-5 SKH55 and W6Mo5Cr4V2Co5
- Cobalt content of 5% for red hardness above M2
- Hardness up to 64-66 HRC after heat treatment
- Thickness 0-1000mm cut to customized size
- Delivery annealed or quenched and tempered
- Surface raw material milling or grinding
- Bending welding decoiling cutting and punching available
- Supplied with mill test certificate
Materials
- Molybdenum based cobalt alloyed high speed tool steel
- Cobalt at 5% of the composition for hot hardness
- Tungsten 5.50-6.50 and molybdenum 4.75-5.25 as the main carbide formers
- Chromium 3.80-4.50 for hardenability and vanadium 1.75-2.15 for wear resistance
Certification
- Mill test certificate supplied with each shipment
Manufacturing
How It Is Made and Processed
Steelmaking to the M35 composition limits
Hot rolling to plate and blank stock
Annealing for machinability in the customer tool room
Quenching and tempering when hardened delivery is ordered
Milling or grinding the surface to the ordered condition
Cutting punching and bending to the blank drawing
Packing and marking for export
Quality Control
Checks Before It Ships
- Composition verified against the C W Cr Mo V Si Mn P S limits
- Phosphorus and sulphur held to the stated 0.030 maximum
- Mill test certificate raised for each ordered grade designation
- Thickness confirmed inside the 0-1000mm range before cutting
- Ground and milled surfaces inspected before packing
Customization
What We Can Change on Your Order
- Blanks cut to the finished tool size from your drawing
- Annealed delivery for in house heat treatment or quenched and tempered ready to grind
- Raw milled or ground surface condition
- Punched and bent parts produced before shipment
- Certificate naming M35 W6Mo5Cr4V2Co5 or the equivalent your drawing calls
Comparison
M35 high speed steel Against the Alternatives
| HSS M2 high speed steel | M35 adds 5% cobalt, which is the reason it holds hardness in cuts where M2 edges are already softening. |
|---|---|
| 1.3355 T1 tungsten high speed steel | T1 is the tungsten type without cobalt. M35 is the molybdenum cobalt type and is the more commonly used and economically priced of the two. |
| Solid carbide blanks | Carbide cuts harder but cannot be welded or punched. M35 is processed in a conventional tool room and reground many times. |
| Carbon tool steel | Carbon tool steel is cheaper but has no red hardness, so it is limited to low speed cutting rather than production tooling. |
Use Guide
Specifying Handling and Welding Notes
- Move to M35 from M2 when the failure mode is heat rather than impact
- Set tempering and grinding allowance against the documented 64-66 HRC
- Order annealed stock when the blank is machined before heat treatment
- Specify ground surface only where the next operation needs a clean datum
- Supply the blank drawing so cutting and punching are done before shipment
- Ask for the mill test certificate to be issued under the grade name used on your drawing
Questions Buyers Ask
M35 high speed steel FAQ
How is M35 different from M2?
M35 carries 5% cobalt and M2 does not. That cobalt is what gives M35 its red hardness and longer life when the cutting edge runs hot.
What grade names will appear on the certificate?
M35 1.3243 HS6-5-2-5 SKH55 and W6Mo5Cr4V2Co5 all describe this steel. Tell us which designation your drawing uses and the certificate is issued to match.
What hardness does it reach?
Up to 64-66 HRC after heat treatment. The exact result depends on the austenitising and tempering cycle used.
Can you cut blanks rather than shipping full plate?
Yes. Size is customized and cutting punching bending welding and decoiling are all available, so blanks can arrive close to the finished tool size.
What are the carbon and cobalt levels?
Carbon runs 0.82-0.95 and the cobalt addition is 5%. Tungsten is 5.50-6.50, molybdenum 4.75-5.25 and vanadium 1.75-2.15.
Is a sample available before we commit to a batch?
Samples are available. Give the thickness and blank size you want to trial and we will confirm what can be released.
How should the material be packed for sea freight?
Blanks are marked and packed with the surfaces protected. Tell us if ground faces must be oiled or separated and that is done before loading.
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