418 Stainless Steel
UNS S41800
Description
418 stainless steel, also known as 'Greek Ascoloy', is a martensitic chromium-tungsten-nickel stainless designed for services up to 1200 °F. This steel is an extremely deep-hardening grade and it has a superior creep strength and resistance to stress-corrosion cracking and tempering as compared to the general properties of 12% chromium stainless steels. In addition, 418 stainless steel has good corrosion resistance, high harness, toughness and strength. Typical applications are steam turbine buckets and blades as well as compressor parts in gas turbines and high temperature bolts.
Chemical Component
| Cr | Ni | W | Si | C | Mn | S | P | Fe |
|---|---|---|---|---|---|---|---|---|
| 12.00-14.00% | 1.80-2.20% | 2.50-3.50% | 0.50% max | 0.15-0.20% | 0.50% max | 0.03% max | 0.04% max | Balance |
Basic Information
| Items | 418 Stainless Steel |
|---|---|
| Catalog | ACMA-Fe-A020 |
| Density | 7.86 g/cm3 |
Material Forms
Alfa Chemistry offers 418 stainless steel in a variety of forms, including Round bar, Sheet, Plate, Wire.
Mechanical Properties
| Properties | At 21 °C |
|---|---|
| Ultimate Tensile Strength, MPa | 965 |
| 0.2% Yield Strength, Mpa | 760 |
| Elongation % | 15 |
| Hardness (Brinell) | 302-352 (311 max. for annealed material) |
Specifications
Round bar, Sheet, Plate, Wire: AMS 5616, AMS 5508
Applications
- Compressor components
- Steam and gas turbine blades
- Steam turbine buckets
- Elevated temperature bolts
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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