M35 | 1.3243 | SKH55
The M35 High Speed Steel is known for its balanced combination of abrasion resistance, toughness and very good hot hardness. M35 high speed steel is similar with M2 speed steel but with added 5% cobalt to increase hot hardness, A tungsten-molybdenum-cobalt high speed steel it is used in a variety of applications and worldwide it is the most popular high speed steel because of its superior qualities and very good hot hardness. As a result of its low carbon content, M35 high speed steel has an outstanding combination of toughness properties and abrasion resistance when correctly hardened and tempered.
Description
Chemical Composition
| Standard | Grade | C | Si | Mn | Cr | P | S | Mo | V | W | Co |
| ASTM | M35 | 0.82-0.95 | 0.2-0.45 | 0.15-0.40 | 3.75-4.50 | ≤0.03 | ≤0.03 | 4.75-5.25 | 1.75-2.15 | 5.50-6.50 | 4.60-5.00 |
| DIN | 1.3243 | 0.87-0.95 | ≤0.45 | ≤0.40 | 3.80-4.50 | ≤0.03 | ≤0.03 | 4.70-5.20 | 1.70-2.10 | 5.90-6.70 | 4.50-5.00 |
| JIS | SKH55 | 0.87-0.95 | ≤0.45 | ≤0.40 | 3.80-4.50 | ≤0.03 | ≤0.03 | 4.70-5.20 | 1.70-2.10 | 5.90-6.70 | 4.50-5.00 |
Supply Range
Surface Finish: Black, Peeled, Machined/Turned or as per given requirements.
Forged Round Bar: 20mm - 650mm (Dia)
Rolled Bars: 12mm - 360mm (Dia)
Forged flats: 30-400mm(T)*500-1200mm(W)
Rolled flats: 10-360mm(T)*30-1020mm(W)
Other sizes of O1 material or as per customer’s requirements
Heat Treatment
Soft annealing
820 to 850 °C for about 2 to 5 hours
slow controlled cooling of 10 to 20 °C per hour to about 550 °C;
further cooling in air. Maximum 270 HB
Hardening
1190 - 1230 °C
Quenching in oil/compressed gas/air/hot bath
obtainable hardness: 66 HRC
Tempering
slow heating to tempering temperature (to avoid forming of cracks)
immediately after hardening;
triple tempering is recommended
Application
AISI HSS M35 tool steel is usually used in conditions with the demand for high hardness. M35 steel is suitable for cutting tools such as cutting tools including broaches, milling cutters, reamers, end mills and saw blades. It is also a good quality wear resistant HSS grade for cold work area. Steel M35 is also suitable for cold work applications, where exacting demands are imposed on wear resistance. The steel possesses an admirable combination of wear resistance and toughness and in these respects superior to the high alloyed cold work steels.
