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

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Materials of Construction - Metals - Alloy 33
February 4, 2003

Introduction
Chemical Composition
Corrosion Resistance
Designations
Specifications
Physical Properties
Mechanical Properties

Fabrication
        Heat Treatment
        Forming
        Welding
Associated Links

Introduction

Alloy 33 is a relatively new chromium-based corrosion resistant austenitic material introduced in 1995.  It offers outstanding resistance to highly oxidizing media.  Corrosion resistance is enhanced by additions of molybdenum and copper.

The high nitrogen content results in a small grain size in the solution-annealed condition which gives the material a high yield strength and excellent toughness properties.

Typical applications of Alloy 33 include heat exchangers, vessels, tubes and other equipment for sulphuric acid plants, sulphuric acid heat recovery and distribution systems, nitric-hydrofluoric acid pickling plants, seawater systems, evaporation plants for salts and alkalis, bleaching plants for chemical pulp, plate or tubular exchangers using brackish water or seawater as a coolant and lightweight strutures in the offshore industry.

Chemical Composition (%)

Nickel Ni 31
Nitrogen N 0.4
Chromium Cr 33
Molybdenum Mo 1.6
Iron Fe 32
Copper Cu 0.6
Carbon C 0.010

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Corrosion Resistance

Test Temperature (°C) Corrosion Rate (mm/year)
98% H2SO4, 7 days 100 0.04
125 0.07
150 0.08
175 0.16
200 0.04
99.1% H2SO4, 134 days, velocity > 1.2 m/s 150 < 0.01
96-98.5% H2SO4, 14 days, velocity > 1 m/s 135 to 140 < 0.01
96% H2SO4, 65 days, velocity > 1 m/s, saturated with SO2 80 0.06
96% H2SO4, 7 days, with nitrosylsulfuri acid 240 0.33

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Designations

UNS R20033

W.Nr. 1.4591

Krupp VDM: Nicofer 3033 - Alloy 33

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Specifications

VdTÜV Sheet 516

ASME Code Case 2227

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Physical Properties

No information

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Mechanical Properties

No information

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Fabrication

Heat Treatment

No information

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Forming

No information

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Welding

Alloy 33 is weldable by gas tungsten arc welding (GTAW) using matchng filler, plasma arc welding and laser welding.  The mechanical properties of the matching weld deposit compare favourably with those of the base material.

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