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Knowledge for the Sulphuric Acid Industry

Introduction
General
Definitions
Instrumentation
Plant Safety
Metallurgial Processes
Metallurgical
Sulphur Burning
Acid Regeneration
Lead Chamber
Technology
Gas Cleaning
Contact
Strong Acid
Acid Storage
Loading/Unloading
Transportation
Sulphur Systems
Liquid SO₂
Boiler Feed Water
Steam Systems
Cooling Water
Effluent Treatment
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Construction
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Inspection
Analytical Procedures
Materials of Construction
Corrosion
Properties
Vendor Data

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Materials of Construction - LEWMET®
July 2, 2003

Introduction 

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® materials.   Contact Chas. S. Lewis for further information.

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Corrosion Resistance

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