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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
Utilities
Construction
Maintenance
Inspection
Analytical Procedures
Materials of Construction
Corrosion
Properties
Vendor Data

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Materials of Construction - Metals - Alloy 20
December 12, 2001

Introduction

Alloy 20 is a highly alloyed iron-base nickel-chromium-molybdenum stainless steel developed primarily for use in the sulphuric acid related processes. Besides sulphuric acid related processes, some typical corrosion resistant applications for the alloy include chemical, pharmaceutical, food, plastics, synthetic fibres, pickling and FGD systems plus many others.

The high nickel content combined with chromium, molybdenum, and copper gives the alloy good resistance to pitting and chloride-ion stress-corrosion cracking. The copper content combined with other elements gives the alloy excellent resistance to sulphuric acid corrosion under a wide variety of conditions. The addition of columbium stabilizes the heat affected zone carbides so the alloy can be used in the as-welded condition. Alloy 20 has good mechanical properties and is easily fabricated.

Chemical Composition (wt% typical)

Corrosion Resistance

Designations

UNS N08020

Alternate Names: Carpenter 20Cb3

Specifications

Physical Properties

Mechanical Properties

Fabrication

To follow

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