HPA Alloy Cobalt 6BH - UNS R30016

UNS R30016

Typical Inventory

Round Bar, Plate

Product Description

This alloy surpasses standard Cobalt 6B with better ductility, with 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.

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.°F
    32-932°F 8.3 microinches/in.°F
    32-1472°F 9.1 microinches/in.°F
    32-1832°F 9.7 microinches/in.°F


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 uses Cobalt 6BH for its wear life, and minimal metal loses. 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 use 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. Bar can be supplied in random lengths or cut to order. Sheet and plate offered as whole plates, or can be abrasive cut, or processed further using waterjet services.

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, & many other miscellaneous wear surfaces.


C Cr Fe Mo Mn Ni W
Max 1.40% 32% 3% 1.5% 2% 3% 3.5%
Min 0.90% 28% 5.5%

Mechanical Properties

Ultimate Tensile (ksi) Yield Strength (ksi) Elong. % Hardness (Rockwell C)
195 121 4.5 42 - 49

Common Specifications

The typical properties listed on page one can be provided in rounds, sheet, strip & plate. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs.

Bar Sheet Plate
AMS 5894 AMS 5894 AMS 5894


Alloy 6BH is generally machined with tungstencarbide tooling, and will produce a finish of about 200-300 RMS. Carbide inserts are used with a 5-degree (0.9 rad.) negative tool holder and a 30-degree (0.52 rad.) or 45-degree (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-degree (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 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 may cause surface imperfections.

Data Sheet

Download our datasheet here