Sandvik HT 9067

Materials of Construction - Sandvik HT 9067
June 6, 2005

Introduction
Corrosion Resistance
Properties
Approvals

Associated Links

Sandvik HT 9067 is a patented duplex stainless steel developed and adapted for use in hot concentrated sulphuric acid. It exhibits excellent corrosion resistance to sulphuric acid including when fluorides are present. It is resistant to chlorides, pitting and crevice corrosion and stress corrosion cracking. The material can be easily worked and has good weldability. Sandvik HT has very high strength as do most duplex stainless steels.

The above properties make Sandvik HT ideal for the following applications in the sulphuric acid industry:

Low pressure steam boilers
BFW heaters
Heat recovery systems
Seawater acid coolers

Sandvik HT will experience accelerated corrosion if the acid contration drops below 97% acid.

Properties

Mechanical

Yield Strength (0.2% offset) minimum	200°C	470 MPa
Tensile Strength	200°C	720 MPa
Elongation	200°C	25%

Physical

Thermal Conductivity	20-300°C	13-18 W/m °C
Thermal Expansion	30-300°C	12.5 x 10^-6 per °C
Modulus of Elasticity	20-200°C	200,000-186,000 MPa

Approvals

ASME Code Case

PED-PMA


Sulphuric Acid on the Web^TM	Technical Manual	DKL Engineering, Inc.