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Projects / Programmes source: ARIS

Prevention of embrittlement in the heat affected zone of weldments of the high strength steel niomol 490 k for vessels for hydrocarbons

Research activity

Code Science Field Subfield
2.04.00  Engineering sciences and technologies  Materials science and technology   

Code Science Field
T150  Technological sciences  Material technology 
T450  Technological sciences  Metal technology, metallurgy, metal products 
Keywords
vessels for hydrocarbons, structural steel, weldments, resistance to hydrogen embrittlement
Evaluation (rules)
source: COBISS
Researchers (8)
no. Code Name and surname Research area Role Period No. of publicationsNo. of publications
1.  08236  Boris Arzenšek  Materials science and technology  Researcher  2003 - 2005  225 
2.  00741  Bojan Breskvar  Materials science and technology  Researcher  2003 - 2004  160 
3.  17161  Roman Celin  Materials science and technology  Researcher  2003 - 2005  285 
4.  04982  Dimitrij Kmetič  Materials science and technology  Researcher  2003 - 2005  421 
5.  07642  PhD Vojteh Leskovšek  Materials science and technology  Researcher  2003 - 2005  359 
6.  13026  PhD Roman Šturm  Manufacturing technologies and systems  Researcher  2003 - 2005  329 
7.  08195  PhD Borivoj Šuštaršič  Materials science and technology  Researcher  2003 - 2005  412 
8.  09788  PhD Jelena Vojvodič Tuma  Civil engineering  Head  2003 - 2005  629 
Organisations (1)
no. Code Research organisation City Registration number No. of publicationsNo. of publications
1.  0206  Institute of Metals and Technology  Ljubljana  5051622000  5,981 
Abstract
Slovenia has to build reserves of capacity of 500.000 m3 for earth oil derivates before its full assotiation to the EU. Some years age in the company Acroni the new steel Niomol 490 K was developed with cooperation with IMT. This new steel has a significantly greater yield stress and according to the API test a three times better resistance to hydrogen embrittlement than the 350 MPa yield stress, which is generally used for great vessels. International experience shows that by using a higher yield stress steel the costs are decreased by approximately half of the relative difference in yield stress due to the smaller steel weight, the smaller consumption in welding consumables, on site work, etc. The hydrogen embrittlement is caused because traces of water and hydrogen sulphide reacts with iron, the produced atoms of hydrogen penetrate in the steel and produce the embrittlement. Laboratory experiments have shown that the temperature of brittle fracture of the heat affected zone is increased in weldments of plates of thickness below 15 mm, while it remains very low in weldments of plates of thickness of above 20 mm. The aim of this project is to explain the cause of the embrittlement with thin plates weldments, and to establish methods for it prevention.
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