AMS 5894 Stellite 6B Cobalt Alloy Bar

 

Stellite 6B alloy rods are essentially the ultimate wear-resistant material that "can last until the very end in harsh environments with intense friction between metals and particles."

 

Based on our past machining experience, Stellite 6B is one of the most difficult materials to machine on Earth. Its high hardness, poor thermal conductivity, and carbide inclusions are "killers" of cutting tools. Only grinding, electrical discharge machining (EDM), or extremely low-speed carbide tools can be used for limited turning operations. The machining cost far exceeds the material's intrinsic value. The material itself is expensive mainly due to the strategic metals such as cobalt and tungsten, as well as the complex casting process.

 

It outperforms traditional cast materials in demanding industrial, aerospace, and energy applications. Available Forms & Sizes：

 

01

 

Round Bar

0.312" – 6.000" diameter (up to 160" length)

 

02

 

lat Bar / Sheet

0.031" – 1.000" thickness (up to 96" length)

 

03

 

Custom Sizes

Machined or forged to specification

A precise inquiry for Stellite 6B alloy bars can help you filter out unprofessional suppliers.

1. Specify Material Standards and Grades:

Our commonly used standards are AMS 5387 (Aerospace Materials Standard) or ASTM A560 (Cast Cobalt Alloys).

Unified Grade: UNS R30016.

2. Provide Specifications and Delivery Conditions:

Diameter, Length. Typically, it's a cast blank with a relatively large diameter tolerance (e.g., ±2mm).

Delivery Condition: As-Cast.

3. Core Performance Requirements (Core of the Technical Agreement):

Hardness range must be locked: "The material hardness should be HRC 42-46 (as-cast, measured at the center of the cross-section)."

Key components must be locked: "Carbon (C) content: 1.0-1.3%, Tungsten (W) content: 4.5-5.5%."

Casting Quality: "Castings must be free of visible defects such as shrinkage cavities, porosity, and cracks; non-destructive testing (such as PT/UT) is permitted."

4. Special Requirements:

Metallographic Structure: Metallographic photographs can be requested to observe the uniformity of carbide distribution (preferably a uniform network distribution).

(Typical value, based on AMS 5387 and other standards)

Key points for procurement: The bars you purchase are typically "cast round bars" or "centrifugally cast tube blanks," supplied in the "as-cast" state. The user will then machine them into parts.

(Your Firewall, Our Bottom Line)

1. Document Review:

Material Test Report (MTR): Must include chemical composition, especially measured values ​​of C, W, and Cr.

Hardness Report: Measured values ​​of as-cast hardness.

2. Physical Inspection:

We adhere to a one-shipment-one-inspection policy. Initial sampling and secondary re-inspection are combined, with comparison of multiple sets of test data. Images, videos, report data archives, and sample retention are also maintained.

Macroscopic Inspection: Carefully observe the end faces and surfaces for casting defects (shrinkage cavities, cracks).

Chemical Composition Verification (PMI): Upon arrival, a portable spectrometer (PMI) is used to focus on testing tungsten (W) and chromium (Cr). Carbon (C) cannot be measured on-site, but W content is an important indirect indicator. If the W content does not meet the standard, performance will inevitably be substandard.

Hardness Testing (Mandatory): Test the HRC hardness on the cross-section of the bar (avoiding the surface). It must conform to the agreed range. This is the final manifestation of performance.

Third-party verification: Cut samples and send them to a third-party laboratory for comprehensive chemical analysis, hardness testing, and metallographic analysis.

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