Sheet cobalt alloy L-605™

for the aerospace industry

The ATI L-605™ alloy is a cobalt-based, solid-solution strengthened alloy that has excellent high temperature strength, good oxidation resistance up to 2000°F (1093°C), and excellent sulfidation resistance. This alloy also offers good resistance to wear and galling. The high temperature strength results from solid-solution strengthening by tungsten with second phase strengthening by precipitated carbides. ATI L-605 alloy is used in the hot sections of aircraft gas turbine engines (i.e., combustion liners), and for industrial furnace and other high temperature applications. Elsewhere, this grade is known as alloy 25. FORMS AND CONDITIONS AVAILABLE The ATI L-605™ alloy is available in sheet and strip product forms. It is normally provided in the solution annealed condition. The ATI L-605™ alloy (UNS R30605) is covered by the AMS 5537 specification Limiting Chemical Composition of ATI L-605™ Alloy (AMS 5537 Specification Limits for UNS R30605) Element Weight Percent Carbon 0.05 – 0.15 Manganese 1.00 – 2.00 Silicon 0.40 max Phosphorus 0.040 max Sulfur 0.030 max Chromium 19.00 - 21.00 Nickel 9.00 - 11.00 Tungsten 14.00 – 16.00 Iron 3.00 max Cobalt Remainder