Search
Filters
Close

11146 The Influence of Surface Pre-Treatment on the Metal Dusting Behavior of Cast and Wrought 20Cr32NiFe

Product Number: 51300-11146-SG
ISBN: 2011 11146 CP
Author: Chrétien Hermse, Henrik Asteman, R. M. IJzerman and Dietlinde Jakobi
Publication Date: 2011
$0.00
$20.00
$20.00
Corrosion investigations and testing standards normally use standard surface pre-treatments, e.g. ground samples. This is in order to be able to determine the impact of various elements. The end users of materials therefore generally have access to good data regarding the impact of the alloy composition. The problem is that alloys are almost never used in a ground condition, as the surface condition strongly depends on the production route used. This study addresses this problem.

The metal dusting resistance of wrought and spun cast 20Cr32NiFe with different surface states has been investigated. The samples came from commercially available tubes with their standard surface condition; the wrought alloys in a pickled state and the spun cast deep hole drilled. Samples with the original and ground surfaces were exposed for 300 h at 600 °C in a CO/CO2/H2/H2O mixture, Ptot=5.5 bar (ac: Boudouard/COred/Water-Gas-Shift: 558/232/379), corresponding to conditions in some furnaces used for the direct reduction of iron ore. The results clearly show that that 20Cr32NiFe is not suitable for high carbon activities. However, the pickled surface was sensitive toward metal dusting attack while the drilled and the ground samples had better resistance. This shows that the surface pre-treatment plays a crucial role.

Key words: metal-dusting, surface pre-treatment, wrought alloys, cast alloys, pickling, machining
Corrosion investigations and testing standards normally use standard surface pre-treatments, e.g. ground samples. This is in order to be able to determine the impact of various elements. The end users of materials therefore generally have access to good data regarding the impact of the alloy composition. The problem is that alloys are almost never used in a ground condition, as the surface condition strongly depends on the production route used. This study addresses this problem.

The metal dusting resistance of wrought and spun cast 20Cr32NiFe with different surface states has been investigated. The samples came from commercially available tubes with their standard surface condition; the wrought alloys in a pickled state and the spun cast deep hole drilled. Samples with the original and ground surfaces were exposed for 300 h at 600 °C in a CO/CO2/H2/H2O mixture, Ptot=5.5 bar (ac: Boudouard/COred/Water-Gas-Shift: 558/232/379), corresponding to conditions in some furnaces used for the direct reduction of iron ore. The results clearly show that that 20Cr32NiFe is not suitable for high carbon activities. However, the pickled surface was sensitive toward metal dusting attack while the drilled and the ground samples had better resistance. This shows that the surface pre-treatment plays a crucial role.

Key words: metal-dusting, surface pre-treatment, wrought alloys, cast alloys, pickling, machining
Product tags
Also Purchased
Picture for 11157 Performance of Alumina-Forming Austenitic Steels
Available for download

11157 Performance of Alumina-Forming Austenitic Steels, Fe-base and Ni-base Alloys Exposed to Metal Dusting Environments

Product Number: 51300-11157-SG
ISBN: 2011 11157 CP
Author: Aurelie Vande Put, Kinga A. Unocic, Michael P. Brady and Bruce A. Pint
Publication Date: 2011
$20.00
Picture for 11051 Bouri Field Platforms, Libya. Review and Statistical Analysis of CP Inspection Data
Available for download

11051 Bouri Field Platforms, Libya. Review and Statistical Analysis of Cathodic Protection Inspection Data

Product Number: 51300-11051-SG
ISBN: 11051 2011 CP
Author: Ahmed Msallem, Paolo Cavassi, Simone Pietro Dubini, Bruno Bazzoni, Filippo Belloni and Isabella Rome
Publication Date: 2011
$20.00
Picture for 11143 Behavior of Nickel-tin Coated High Temperature Materials
Available for download

11143 Behavior of Nickel-tin Coated High Temperature Materials Exposed Under Metal Dusting Conditions

Product Number: 51300-11143-SG
ISBN: 2011 11143 CP
Author: C. Geers, M. Schütze
Publication Date: 2011
$20.00