Description
SS 418 Round Bars / Greek Ascoloy Round Bars
SS 418 Round Bars / Greek Ascoloy (Alloy 418, UNS S41800) is a high-strength, hardenable martensitic stainless steel containing chromium, nickel, and tungsten, known for superior performance in high-stress, high-temperature environments (up to 1200°F/649°C), offering excellent creep strength, tempering resistance, and corrosion resistance, ideal for turbine parts, bolts, and fasteners.
Stainless Steel 418, also known as ‘Greek Ascoloy’ (UNS 41800) is a heat resisting martensitic chromium-tungsten-nickel stainless steel. Greek Ascoloy is engineered for use in high-stress components up to 649⁰ C. This grade is used for jet engine compressor blades and vanes due to resistance to stress corrosion cracking. Also used for discs in lower temperature turbine stages and for turbine diffuser components.
418 Chemical Composition of GREEK ASCOLOY :
| % | Min. | Max. |
| C | 0.15 | 0.20 |
| Cr | 12.00 | 14.00 |
| W | 2.50 | 3.50 |
| Ni | 1.80 | 2.20 |
| P | – | 0.040 |
| S | – | 0.030 |
| Si | – | 0.50 |
| Mn | – | 0.50 |
| Fe | Balance | |
Applications of Greek Ascoloy (SS 418) :
Compressor components
Steam and gas turbine blades
Steam turbine buckets
Elevated temperature bolts
Steam turbine buckets and blades
Gas turbine compressor parts
High temperature bolts
Jet engine compressor blades and vanes
Turbine diffuser components
Aircraft landing gear
petrochemical components
Standard Inventory Specifications :
AMS 5616
UNS S41800
ASTM A565
Other industry standards we comply with:
PWA LCS
GE Aircraft Engine (GT193)
GE S400
DFARS Compliant
RR SABRe
Line marked > .500 inch diameter
Predominantly produced by VIM-VAR melt method. Hot rolled, fully annealed, then centerless ground or rough turned.
Grade Greek Ascoloy Stainless Steel (418)
