HPA 6BH (Hardened)
HPA 6BH - UNS R30016 - Hardened Alloy 6B - CoCrW Alloy
Home > All Alloys > HPA 6B > HPA 6BH
| Table of Contents | |
|---|---|
| Chemistry | Applications |
| Inventory | Mechanical Properties |
| General Data | Machining, Welding, & Processing |
| Specifications | References |
This alloy surpasses standard Cobalt 6B with better ductility yet the same good hardness. Cobalt 6BH is the same composition of Cobalt 6B, except the material is hot rolled and then age hardened. The direct age-hardening after hot rolling provides the maximum hardness and wear resistance. The advantages this creates are increased wear life, retained edge characteristics, and increased hardness. These properties are in addition to the galling and seizing resistance of the regular Cobalt 6B. Cobalt 6BH is known in the industry as a metal that retains its cutting edge. The economic advantages are in its long wear time, less down time, and fewer replacements. Link to alloy 6B.
Chemistry*
| Min% | Max% | |
|---|---|---|
| Co | Bal. | |
| Cr | 28.00 | 32.00 |
| W | 3.50 | 5.50 |
| Ni | 3.00 | |
| Si | 2.00 | |
| Fe | 3.00 | |
| Mn | 2.00 | |
| Mo | 1.50 | |
| C | 0.90 | 1.40 |
Typical Inventory
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Applications
Applications for alloy 6BH include tile making machines, rock crushing rollers, and cement and steel mill equipment. Alloy 6BH is well suited for valve parts, pump plungers, shafting, and sleeves.
Food preparation machinery that cuts, chops, slices, dices, and shreds can use Cobalt 6BH for its wear life and minimal metal losses. The F.D.A. has issued approval for food contact due to its minimal metal loss and government approval of cobalt containing equipment.
Cobalt 6BH is also used in non-food applications such as tire cord cutting, carpet cutting, trimming knives for ceramics, leather knives, surgical blades, and Kevlar. Other applications include saw blade tips, scrapper blades, chippers, shredders, and other cutting edges.
Wrought alloy 6BH offers the fatigue resistance and toughness of a hot worked microstructure with the heat corrosion and wear resistance of cobalt based alloy. High Performance Alloys, Inc. inventories sheet, and plate. Bar can be produced 1/2" through 2-1/2" diameter.
Other applications are steam turbine erosion shields, chain saw guide bars, high temperature bearings, valve stems, food processing equipment, needle valves, centrifuge liners, hot extrusion dies, forming dies, nozzles, extruder screws, and many other miscellaneous wear surfaces.
General Data
- Solution Annealed 2250 °F, Air Cooled
- Density 0.303 lb/in3
- Specific Heat (@ 72 °F) 0.101 Btu/lb-°F
-
Thermal Conductivity (32 to 212 °F)
103 Btu-in./sq. ft.-hr.-°F
-
Electrical Resistivity (68 °F)
546 Ohms/ cir mil ft
- Melting Range 2310 to 2470 °F
- Electrical Conductivity compared to Copper 1.90%
- Reflecting Power 57 - 70%
-
Mean Coefficient of Thermal Expansion
32-212°F 7.7 microinches/in.°F32-932°F 8.3 microinches/in.°F32-1472°F 9.1 microinches/in.°F32-1832°F 9.7 microinches/in.°F
Mechanical Properties
The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs. The table below shows our nominal Mechanical Properties of Alloy 6BH. For most common forms and exceptions, check out the datasheet linked underneath the table.
| UTS ksi (MPa) | YS ksi (MPa) | Elong., % | Rockwell Hardness |
|---|---|---|---|
| 195 (1344) | 121 (834) | 4.5 | 42-49C |
UTS = Ultimate Tensile Strength, YS = Yield Strength
Link to our HPA datasheet on alloy 6BHCommon Specifications
Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.
| Bar | Sheet | Plate |
|---|---|---|
| AMS 5894 | AMS 5894 | AMS 5894 |
Machining
Alloy 6BH is generally machined with tungsten carbide tooling and will produce a finish of about 200-300 RMS. Carbide inserts are used with a 5° (0.9 rad.) negative tool holder and a 30° (0.52 rad.) or 45° (0.79 rad.) lead angle. Tools for facing or boring are essentially the same except for greater clearances where needed. For best results in drilling, the drill web should be kept thin. Screw machine length, carbide tipped drills should be used. In reaming, a 45° (0.79 rad.) cutting lead angle should be used. High speed taps are not recommended for Alloy 6BH but threads can be produced by EDM techniques. For a better surface finish, this alloy should be ground.
6BH is ground to obtain close tolerances with excellent finish properties. Do not quench dry ground material as it may cause surface imperfections.
Link to alloy 6B.References
Link to Stellite's datasheet on alloy 6BStellite® is a registered trademark of Kennametal Inc..
Data referring to mechanical properties and chemical analyses are the result of tests performed on specimens obtained from specific locations of the products in accordance with prescribed sampling procedures; any warranty thereof is limited to the values obtained at such locations and by such procedures. There is no warranty with respect to values of the materials at other locations.