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

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Materials of Construction - Sandvik SX®
June 6, 2005

Introduction
Corrosion Resistance
Properties
        Mechanical
        Physical Properties
Specifications
Approvals
Weldability		 Associated Links

Sandvik HT 9067

Introduction

Sandvik SX (UNS S32615) is a high silicon containing austenitic stainless steel.  It was developed by Sandvik exclusively for use in concentrated sulphuric acid.  Edmeston AB is a wholly owned subsidiary of Sandvik and introduced SX to the industry in 1985.  Edmeston continue to market SX world wide through its licensees, agents and representatives.

Edmeston has developed a complete standard for pipes, flanges and fittings made of SX.  The standard is based on ASME B 31.3 and covers the size range from DN 25 (1”) up to DN 600 (24”).  Flanges are available in ISO, PN 10 and ANSI B16.5 (150 lb) standards.  Larger dimensions and other custom parts are manufactured according to individual customer needs.

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Corrosion Resistance

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Properties

Mechanical

Yield Strength (0.2% offset) minimum 20°C 220 N/mm²
50°C 196 N/mm²
100°C 175 N/mm²
150°C      160 N/mm²
200°C 148 N/mm²
Yield Strength (0.1% offset) minimum 20°C  250 N/mm²
Tensile Strength 20°C 550-800 N/mm²
Elongation A5 20°C       30%
Hardness, Vickers    160 nom

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Physical Properties

Density 7.8 g/cm³
Thermal Conductivity   20°C   11 W/m °C
100°C 13 W/m °C
200°C 14 W/m °C
Specific Heat Capacity  50-100°C 500 J/kg °C
Thermal Expansion 20-100°C  15.0 x 10-6 per °C
20-200°C 15.5 x 10-6 per °C
20-300°C     16.0 x 10-6 per °C
Modulus of Elasticity  20°C     200,000 N/mm²
400°C  170,000 N/mm²

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Specifications

Seamless Tube ASTM A213, A312, A530
SS 219711
Plate ASTM A480
SS 219120
Welded Pipe ASTM A530

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Approvals

ASME Code Case 2029-2

The National Swedish Board of Occupational Safety and Health

TÜV Wien, Austria

TÜV Nord, Einzelgutachten

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Weldability

As is common for most stainless steel, SX is welded with low heat input.  The welding properties are good and the welds produced are smooth and show a corrosion resistance comparable to that of the base metal.

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