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

New Publications available from DKL Engineering  Click Here

Pre-order your copy of the Handbook of Sulphuric Acid Manufacturing - 2nd Edition

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

Google Search

Materials of Construction - Metals - Cronifer 2803 Mo
March 5, 2003

Introduction

Cronifer 2803 Mo also known as “Superferritic” is a iron-chromium-nickel alloy with controlled carbon and nitrogen contents, stabilized with niobium.  The material has excellent resistance to pitting and crevice corrosion in chloride containing media.

Its high chromium content gives outstanding resistance to corrosion in oxidizing media such as hot, concentrated sulphuric acid where it is used in heat recovery systems in sulphuric acid plants. 

Cronifer 2803 Mo is also produced as longitudinally welded  thin wall tubing for heat exchanger using chloride containing cooling water.

Typical applications include seawater or brackish water cooling systems in power stations, seawater desalination plants, storage and transportation of organic and inorganic acids and sulphuric acid production.

A patent application has been submitted for the use of this material in sulphuric acid plants.

Chemical Composition (%)

SEA-CUREŽ is a registered Trademark of Crucible Materials Corporation

Cronifer 2803 Mo and SEA-CUREŽ share the same UNS number.  The composition of the materials are similar but SEA-CURE allows the presence of Mn, Si, P and S and Cronifer 2803 Mo has more stringent specification for C, N and Nb.  SEA-CUREŽ should not be considered as a direct substitute for Cronifer 2803 Mo in hot, concentrated sulphuric acid service without prior testing.

Avesta make a version of 1.4575 called Monit which has a slightly different composition.

Back to top

Corrosion Resistance

No information available

Back to top

Designations

UNS S44660

Werkstoff No. 1.4575

X 1 CrNiMoNb 28 4 2

ASTM A268 Grade 26-3-3

Back to top

Specifications

⁽¹⁾ Krupp VDM literature refers to ASTM A176 as an applicable specification but only UNS S44600 is listed in the specification.

Back to top

Physical Properties

Back to top

Mechanical Properties

No information

Back to top

Fabrication

Heat Treatment

No information

Back to top

Forming

Good

Back to top

Welding

Weldabity is considered satifactory

Filler wire Cronifer S 2803

Back to top

CopyrightŠ 2005, 2006, 2007, 2008 DKL Engineering, Inc., All Rights Reserved
DKL Engineering, Inc. shall not be held liable for any type of damages resulting from the use of this information. The user assumes all risk and liability in connection with the use of information contained in this and associated web sites.  The data is intended for personal, non-commercial use.