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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Sulphuric Acid on the Web

Introduction
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Cooling Water
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Materials of Construction
Corrosion
Properties
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DKL Engineering, Inc.

Handbook of Sulphuric Acid Manufacturing
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Preface
Contents
Feedback

Sulphuric Acid Decolourization
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Preface
Table of Contents

Process Engineering Data Sheets - PEDS
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Table of Contents

Introduction

Bibliography of Sulphuric Acid Technology
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Preface
Contents

Sulphuric Acid Plant Specifications
 

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Materials of Construction - LEWMET®
July 2, 2003

Introduction
Corrosion Resistance
Associated Links

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.

  LEWMET® 15 LEWMET® 33 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
Forms       Cast and wrought
Plate and Wire
Application     98%, 135oC max.  
Composition        

C

0.15-0.25      

Si

0.75 max      

Mn

1.0 max      

Cr

27.0-29.0      

Ni

7.0-9.0      

Mo

2.0-2.5      

Cu

3.0-3.5      

Fe

53.0-59.0      

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Corrosion Resistance

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Lewmet® 55 Isocorrosion Curve

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Lewmet® 66 Isocorrosion Curve

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