Square Grid

Greek Ascoloy (Alloy 418)

A martensitic chromium-tungsten-nickel stainless grade, Greek Ascoloy (Alloy 418) is ideal for high-stress components up to 649⁰C.

Stainless Steel 418, also known as ‘Greek Ascoloy’ (UNS S41800) is engineered for use in high-stress components.


Product formSize range fromSize range to
Greek Ascoloy round bar6.35 mm152.4 mm GET A QUOTE
Greek Ascoloy sheet & plate0.74 mm3.175 mm GET A QUOTE

Can't find the product you need? Please contact us directly.

Gallery Image

Sheet & Plate

Gallery Image

Round Bar

Chemical Analysis



Gallery Image

Perfect for applications in the Aerospace industry

Greek Ascoloy (Alloy 418) can be used in a variety of applications, here are just a few examples:

  • Compressor components
  • Steam and gas turbine blades
  • Steam turbine buckets
  • Elevated temperature bolts

About Greek Ascoloy (Alloy 418)

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 649 ⁰C.

Typical heat treatment at 980⁰C -1010⁰C, followed by air or oil quenching (depending on material thickness) and 2-hour tempering twice at minimum 620⁰C gives Greek Ascoloy (Alloy 418) a superior creep strength and resistance to stress-corrosion cracking and tempering as compared to the general properties of 12% chromium stainless steels.

Filler metal, UNS S41880, has extra molybdenum (0.50 max.), copper (0.50 max.) and tin (0.05 max.) for effective welding process.


7.86 g/cm³


AMS 5508 (sheet/strip/plate), AMS 5616 (bar/forging/wire), ASTM A565 (Grade 615), SAE J467 (Greek Ascoloy)
Download the Greek Ascoloy (Alloy 418) Data Sheet Download

FAQs & Resources

Stainless steel is the generic name of different grades of steels (containing low carbon and iron), used primarily because of their corrosion resistance. All stainless steels share a minimum percentage of 10.5% chromium element. Chromium (Cr), usually a deciding factor, nickel and molybdenum are commonly added to steels to improve their corrosion resistant and make them ‘stainless’. Most of the stainless steel grades will have a UNS number that start off with letter ‘S’ such as UNS S32100 (Alloy 321) and UNS S31008/S31009 (Alloy 310/310S).

Elongation (El) is usually used to describe the ductility of a material in terms of percentage elongation (%El).
%El = [(Lf – L0)/L0] x 100 where Lf – Final gage length at fracture and L0 – Initial gage length of the specimen.

Alloy 321, 316Ti, 309, 310S, 800 H/AT, 253 MA®, RA330 ®, RA333®, 600, 601, 602 CA® are generally referred to as heat resisting alloys and used in various high temperature applications.

Request a Quote

Fill in our online form to get a fast quote. Got a technical question? Contact us on techsales@neonickel.com or for more general enquiries please email us at enquiries@neonickel.com