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Hydrogen embrittlement stress cracking in prestressing steel wires

Singh, S.K. / Sidky, P.S. / Hocking, M.G. / Boran, J.

The high carbon content and severe deformation due to cold drawing affect the corrosion resistance of prestressing steel wires. The effect of alloying elements on the corrosion resistance properties of prestressing steel wires was not adequately known prior to this study. The paper examines the effects of alloying elements and surface condition on the hydrogen embrittlement stress cracking (HESC) behaviour of cold drawn steel wires. To assess the HESC of the steel wires the tests were carried out in 20% ammonium thiocyanate at 50 deg C. Different compositions of micro-alloyed and patented plain carbon steel wires were selected for experimentation. The HESC tests were carried out on wires in as received as well as in the machined and polished conditions. The machined and polished specimens were tested to eliminate the effect of surface condition on the HESC. The HESC behaviour of one type of wire was found to be different in the polished and the as-received condition. The HESC tests on the wire specimens in as received condition were carried out at different levels of specified minimum ultimate tensile strength (SMUTS) i.e. from 10-80% of SMUTS. The FIP tests on the machined and polished specimens were conducted at 70% of SMUTS.

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Hydrogen embrittlement stress cracking in prestressing steel wires

Singh, S.K. / Sidky, P.S. / Hocking, M.G. / Boran, J.

The high carbon content and severe deformation due to cold drawing affect the corrosion resistance of prestressing steel wires. The effect of alloying elements on the corrosion resistance properties of prestressing steel wires was not adequately known prior to this study. The paper examines the effects of alloying elements and surface condition on the hydrogen embrittlement stress cracking (HESC) behaviour of cold drawn steel wires. To assess the HESC of the steel wires the tests were carried out in 20% ammonium thiocyanate at 50 deg C. Different compositions of micro-alloyed and patented plain carbon steel wires were selected for experimentation. The HESC tests were carried out on wires in as received as well as in the machined and polished conditions. The machined and polished specimens were tested to eliminate the effect of surface condition on the HESC. The HESC behaviour of one type of wire was found to be different in the polished and the as-received condition. The HESC tests on the wire specimens in as received condition were carried out at different levels of specified minimum ultimate tensile strength (SMUTS) i.e. from 10-80% of SMUTS. The FIP tests on the machined and polished specimens were conducted at 70% of SMUTS.

Hydrogen embrittlement stress cracking in prestressing steel wires

Singh, S.K. / Sidky, P.S. / Hocking, M.G. / Boran, J.

The high carbon content and severe deformation due to cold drawing affect the corrosion resistance of prestressing steel wires. The effect of alloying elements on the corrosion resistance properties of prestressing steel wires was not adequately known prior to this study. The paper examines the effects of alloying elements and surface condition on the hydrogen embrittlement stress cracking (HESC) behaviour of cold drawn steel wires. To assess the HESC of the steel wires the tests were carried out in 20% ammonium thiocyanate at 50 deg C. Different compositions of micro-alloyed and patented plain carbon steel wires were selected for experimentation. The HESC tests were carried out on wires in as received as well as in the machined and polished conditions. The machined and polished specimens were tested to eliminate the effect of surface condition on the HESC. The HESC behaviour of one type of wire was found to be different in the polished and the as-received condition. The HESC tests on the wire specimens in as received condition were carried out at different levels of specified minimum ultimate tensile strength (SMUTS) i.e. from 10-80% of SMUTS. The FIP tests on the machined and polished specimens were conducted at 70% of SMUTS.

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Title:

Hydrogen embrittlement stress cracking in prestressing steel wires

Contributors:

Singh, S.K. (author) / Sidky, P.S. (author) / Hocking, M.G. (author) / Boran, J. (author)

Published in:

Past Success - Future Challenges, Eurocorr, Eurocorr, 2000 ; 1-10

Publication date:

2000

Size:

10 Seiten, 4 Bilder, 3 Tabellen, 22 Quellen

Type of media:

Conference paper

Type of material:

Storage medium

Language:

English

Keywords:

Stahldraht , mechanische Vorspannung , Kaltziehen , Korrosionsgeschwindigkeit , Korrosionswiderstand , Legierungselement , Wasserstoffversprödung , Ammoniumverbindung , Thiocyanat , Sehne , vorgespannter Beton , Bewehrungsstahl

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