Product : SKH 55 HSS Cobalt
Kategori : High Speed Steel Cobalt (HSS-Co)
Standard: JIS G 4403
Grades : SKH 55
Equivalent
ISORAPID S705, AISI M41, AISI M35, Thyssenkrupp 3243, ASSAB ASP 60, DIN HS6-5-2-5, EN 1.3243, UNS T11341, ASTM A600
Characteristic
SKH 55 is similar to SKH 51 but with 5% cobalt added.
High Speed Steel Cobalt (HSS-Co)
Better hot hardness and wear resistance
Suitable for heat treatment up to 66 HRC
Excellent cutting performance
Availability
Roundbar
Flat
Chemical Composition
| Type | C | Si | Mn | Cr | Mo | V | W | Co |
| S705 | 0.92 | 0.40 | 0.30 | 4.10 | 5.00 | 1.90 | 6.20 | 4.80 |
| SKH55 | 0.87-0.95 | 0.45 Max | 0.40 Max | 3.8-4.5 | 4.7-5.2 | 1.7-2.1 | 5.9-6.7 | 4.5-5.0 |
Mechanical Properties
| Properties | SKH55 | |
| Tensile Strength (MPa) | 1158 | |
| Yield Strength (MPa) | 1034 | |
| Elongation (%) | 15 | |
| Hardness (HB) Max | 335 | |
| Supplied Condition | Annealed |
Physical Properties
| Properties | SKH55 | |
| Density (×1000 kg/m3) | 7.7-8.0 | |
| Elastic Modulus (GPa) | 190-210 | |
| Thermal Conductivity (W/m-K) | 24 | |
| Specific Heat (J/kg-K) | 420 | |
| Electrical Resistivity (Ohm.mm2/m) | 0.49 |
Application
Hobs, twist drills, broaches, taps, reamers, saws, wood working tools and cold work tools
Related Grade
SKH 2 | SKH 3 | SKH 4 | SKH 10| SKH 40 | SKH 50 | SKH 54 | SKH 56 |
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