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

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

Introduction
Chemical Composition
Corrosion Resistance
Designations
Specifications
Physical Properties
Mechanical Properties

Fabrication
        Heat Treatment
        Forming
        Welding
Associated Links

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 (%)

Element Cronifer 2803 Mo SEA-CURE®/ASTM A240 S44660
Nickel Ni 3 - 4 1.0 - 3.5
Nitrogen N 0.020 max 0.040 max
Chromium Cr 28 – 29 25.0 - 28.0
Molybdenum Mo 1.8 – 2.5 3.0 - 4.0
Iron Fe Balance Balance
Manganese Mn - 1.0 max
Carbon C 0.015 max 0.030 max
Silicon Si - 1.00 max
Phosphorous P - 0.040 max
Sulphur S - 0.030 max
C + N - 0.030 max -
Nb/C + N - 12 min -
Ti + Nb and 6x(C+N) min - - 0.20-1.00

SEA-CURE® is a registered Trademark of Crucible Materials Corporation

Cronifer 2803 Mo and SEA-CURE® 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-CURE® 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.

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Corrosion Resistance

No information available

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Designations

UNS S44660

Werkstoff No. 1.4575

X 1 CrNiMoNb 28 4 2

ASTM A268 Grade 26-3-3

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Specifications

Sheet/Strip ASTM A176(1)
ASTM A240
Tubing ASTM A268

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

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Physical Properties

Density 7.7 g/cm3
Specific Heat 400 J/kg K
Thermal Conductivity 14.5 W/m K
Electrical Resistivity 80 µO cm
Thermal Expansion (20-300°C) 10.5 (10-6) /K
Modulus of Elasticity 215 kN/mm2

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Mechanical Properties

No information

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Fabrication

Heat Treatment

No information

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Forming

Good

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Welding

Weldabity is considered satifactory

Filler wire Cronifer S 2803

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