Projects / Programmes
Prevention of embrittlement in the heat affected zone of weldments of the high strength steel niomol 490 k for vessels for hydrocarbons
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 |
vessels for hydrocarbons, structural steel, weldments, resistance to hydrogen embrittlement
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 |
0 |
2. |
00741 |
Bojan Breskvar |
Materials science and technology |
Researcher |
2003 - 2004 |
2 |
3. |
17161 |
Roman Celin |
Materials science and technology |
Researcher |
2003 - 2005 |
0 |
4. |
04982 |
Dimitrij Kmetič |
Materials science and technology |
Researcher |
2003 - 2005 |
0 |
5. |
07642 |
PhD Vojteh Leskovšek |
Materials science and technology |
Researcher |
2003 - 2005 |
0 |
6. |
13026 |
PhD Roman Šturm |
Manufacturing technologies and systems |
Researcher |
2003 - 2005 |
0 |
7. |
08195 |
PhD Borivoj Šuštaršič |
Materials science and technology |
Researcher |
2003 - 2005 |
0 |
8. |
09788 |
PhD Jelena Vojvodič Tuma |
Civil engineering |
Head |
2003 - 2005 |
0 |
Organisations (1)
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.