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Materials of Construction - LEWMET®
July 2, 2003
Introduction Corrosion Resistance |
Associated Links |
LEWMET® designates a series of austenitic nickel-chrome alloys designed specifically as construction materials for use in sulphuric acid plant service. Since 1970, LEWMET® has been regularly and successfully employed in critical wear parts to resist corrosion/erosion/galling in areas having fluid velocities of more than 30.5 m/s (100 ft/s). Extensive corrosion testing indicates a corrosion rate of approximately 0.0762 mm/year (0.003 inches/year) in 98% H2SO4 at 120°C.
LEWMET® owes its superior performance to a unique combination of alloy composition and hardenability. LEWMET® is a nickel-based alloy containing approximately 30% nickel, 30% chromium as well as molybdenum, silicon, copper, manganese and boron. LEWMET® can be hardened to 500 Brinnel without compromising its excellent corrosion resistance.
Due to the proprietary nature of
the material there is not much published information concerning LEWMET®
LEWMET® 15 |
LEWMET® |
LEWMET®
55 |
LEWMET®
66 |
|
Description |
High chromium duplex stainless steel |
Two-phase casting alloy |
Fully austenitic nickel-base alloy | |
Introduced | Early 1970’s |
Late 1970’s |
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Forms |
Cast and wrought |
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Application |
98%, 135oC max. |
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Composition |
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0.15-0.25 |
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0.75 max |
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1.0 max |
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27.0-29.0 |
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7.0-9.0 |
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2.0-2.5 | |||
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3.0-3.5 |
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53.0-59.0 |
Lewmet® 55 Isocorrosion Curve |
Lewmet® 66 Isocorrosion Curve |