Haynes 188 / Alloy 188 vs Stellite 6: 19% composition overlap. Significantly different materials serving different application areas.
Haynes 188 / Alloy 188 vs Stellite 6
Side-by-side chemical composition and mechanical property comparison.
Overview
Haynes 188 / Alloy 188
2.4683
Cobalt-nickel-chromium-tungsten superalloy with lanthanum addition for oxidation resistance. Solid-solution strengthened. Bright annealed: Rm ~946 MPa, Rp0.2 ~464 MPa, A ~53%. At 980°C: Rm ~243 MPa, Rp0.2 ~131 MPa. Density 8.98 g/cm³. Excellent oxidation and sulfidation resistance to 1095°C. Good resistance to molten chloride salts and sulfate hot corrosion. UNS R30188, AMS 5608 (sheet), AMS 5772 (bar). Applications: gas turbine combustors, transition ducts, flame holders, afterburner liners, industrial furnace components.
Stellite 6
R30006
The world's most widely used cobalt-based wear-resistant alloy. CoCrW matrix with hard chromium carbides (M7C3) provides exceptional resistance to abrasion, erosion, cavitation, galling, and corrosion across a wide temperature range. Retains hardness up to 500°C. Non-magnetic. Industry standard for general-purpose wear resistance — suitable for hardfacing (PTA, laser, TIG), casting, and powder metallurgy. Used for valve seats, pump sleeves, bearing surfaces, cutting tools, hot-forming dies, and turbine blade erosion shields.
| Haynes 188 / Alloy 188 | Stellite 6 | |
|---|---|---|
| Material Number | 2.4683 | R30006 |
| Category | cobalt | cobalt |
| Standard | AMS 5608 / AMS 5772 | AMS 5894 |
Chemical composition (wt%)
| Element | Haynes 188 / Alloy 188 | Stellite 6 | Overlap |
|---|---|---|---|
| C | 0.05–0.15% | 0.9–1.4% | No overlap |
| Si | 0.2–0.5% | ≤ 1.5% | OK |
| Mn | ≤ 1.25% | ≤ 1% | OK |
| Cr | 20–24% | 26–32% | No overlap |
Mechanical properties
| Property | Haynes 188 / Alloy 188 | Stellite 6 | Unit |
|---|---|---|---|
| tensile_strength | ≥ 946 | ≥ 896 | MPa |
| yield_strength | ≥ 464 | — | MPa |
| elongation | ≥ 53 | — | % |
Compatibility Assessment
Haynes 188 / Alloy 188 and Stellite 6 have significantly different compositions (19% overlap). These materials are not interchangeable and serve different application areas.
Automated assessment based on composition analysis
Frequently Asked Questions
Is Haynes 188 / Alloy 188 the same as Stellite 6?
Haynes 188 / Alloy 188 and Stellite 6 have a 19% composition overlap. They are generally not directly interchangeable.
Can I replace Haynes 188 / Alloy 188 with Stellite 6?
Generally not recommended. The compositions differ significantly (19% overlap). These materials have different alloying concepts and are intended for different applications.
What is the difference between Haynes 188 / Alloy 188 and Stellite 6?
The main differences are in the following elements: C, Cr, Ni, W. Haynes 188 / Alloy 188 is a cobalt grade, while Stellite 6 is a cobalt grade.
View full data for each material:
Data provided for reference only. Always verify against the applicable specification for critical applications.
All data is for reference only. Equivalents indicate similarity, not identity. Always verify against the applicable specification for safety-critical applications. materialref.com accepts no liability for decisions based on this data.