When a leading aerospace gas turbine facility experienced repeated failures due to high-temperature corrosion and metal fatigue, switching to Haynes 188 Round Bars brought a transformative solution. This cobalt-nickel-chromium-tungsten superalloy combines outstanding strength and oxidation resistance at temperatures up to 1095°C (2000°F), making it the preferred choice across chemical, oil & gas, marine, pharma, and power industries for critical parts requiring durability and long service life.
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Haynes 188 (UNS R30188, AMS 5772) is engineered for extreme environments where carburization, sulfidation, and oxidation challenges prevail. With superior hot corrosion resistance to sulfate deposits and molten chloride salts, the alloy performs well in high-stress and cyclic temperature conditions. Its good weldability and formability offer fabrication flexibility for OEMs and maintenance teams alike.
Stocked in a range of diameters from 10mm to 350mm and finishes from bright to rough-turned, Haynes 188 round bars come with full mill test certifications and meet global standards such as AMS 5772 and NACE MR0175. Reliable global supply ensures timely resources for hardware stores, fabricators, and industrial plants, alongside complementary offerings like Haynes 188 Round Bars and Inconel 718 Round Bars.
Chemistry and technology converge in Haynes 188 to provide safer, more efficient operations and enhanced asset longevity, making it an essential alloy for industries exposed to demanding thermal and corrosive environments.
High-quality Haynes 188 Round Bars ready for industrial use.
Specification Overview
| Grade | Haynes 188 (UNS R30188, AMS 5772) |
|---|---|
| Standards | AMS 5772 (billet, rod, bar and forgings), NACE MR0175 |
| Diameter Range | 10mm – 350mm |
| Length | 1000mm – 6000mm (custom sizes available) |
| Finish | Bright, polished, rough-turned, sand-blasted |
| Delivery | Mill test certificates, export-ready packaging, certified lot traceability |
| Price | INR 5,000 – 15,000 per kg. Indicative USD 60 – 175 per kg; quoted against grade, form, size and quantity. |
Equivalent Grades & Standards
| Property | Value |
|---|---|
| UNS number | R30188 |
| Werkstoff / EN number | 2.4683 |
| EN designation | CoCr20NiW |
| Density | 8.98 g/cm3 |
| Melting range | 1300-1415 °C |
| Electrical resistivity | 101.0 µΩ·cm |
| Thermal diffusivity | 0.0292 cm²/s |
| Thermal conductivity | 10.4 W/m·°C |
| Specific heat (100 °C) | 423 J/kg·°C (RT cell on the source page is corrupt - see note above) |
| Coefficient of expansion (25-100 °C) | 12.1 µm/m·°C |
| Dynamic modulus of elasticity | 232 GPa |
| Modulus of rigidity (dynamic) | 90 GPa |
| Poisson's ratio | 0.30 |
| Rod and bar specification | AMS 5772 |
Identifiers and physical constants for Haynes 188. A dash means no such designation is published for this grade.
Stock & Product Availability
Haynes 188 round bars are stocked globally with common and custom sizes, supporting quick procurement for chemical processing, marine refurbishment, energy generation, and OEM fabrication needs.
Chemical Composition
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | 0.05 | 0.15 |
| Manganese (Mn) | — | 1.25 |
| Silicon (Si) | 0.20 | 0.50 |
| Phosphorus (P) | — | 0.020 |
| Sulfur (S) | — | 0.015 |
| Chromium (Cr) | 20.00 | 24.00 |
| Nickel (Ni) | 20.00 | 24.00 |
| Tungsten (W) | 13.00 | 16.00 |
| Lanthanum (La) | 0.02 | 0.12 |
| Boron (B) | — | 0.015 |
| Iron (Fe) | — | 3.00 |
| Cobalt (Co) | — | Balance |
Composition limits for Haynes 188. These are specification limits for the grade, not measured values for a lot; the mill test certificate supplied with your order states the actual analysis.
Mechanical & Physical Properties
| Property | Typical Value |
|---|---|
| Tensile Strength (MPa) | 930 – 960 |
| Yield Strength (0.2%, MPa) | 445 – 460 |
| Elongation (%) | 55 (average) |
| Hardness (HB) | ~210 |
| Max Service Temperature (°C) | 1095 (2000°F) |
Applications & Benefits
Why this grade
Haynes® 188 is a cobalt-base alloy with a lanthanum addition that improves scale adherence. It carries oxidation resistance to around 1095°C, appreciably higher than alloy 25, together with better long-term thermal stability — which is why combustor liners and transition ducts that would oxidise in 25 are built in 188.
- Chemical: vapor and gas handling systems, heat treating baskets, incinerators
- Marine: turbine engine combustion cans, exhaust components
- Oil & Gas: combustion chambers, ducting, high heat mechanical parts
- Pharma: reactors, sterilization, high-clean thermal processing
- Power: heat treating furnace fixtures, recuperators, hot section components
- Hardware/OEM: wire mesh belts, cast components, structural bars
FAQ & Search Trends
Global Export Destinations
We ship worldwide from Mumbai. See every destination we export to on our export markets page.
Domestic Supply Network Across India
We deliver across India from our Mumbai stockyard. See every city we supply on our supply locations page.
Conclusion
Haynes 188 Round Bars provide premium corrosion resistance and mechanical strength for chemical, marine, oil & gas, pharma, and power generation industries worldwide. Are your assets equipped with this proven high-performance superalloy for enduring industrial demands?