Weldable high strength steels for naval construction
- Cranfield Inst. of Tech. (United Kingdom)
- Defense Research Agency, Holton Heath (United Kingdom)
The benefits of high strength steels in terms of enhanced mechanical performance and weight and cost reduction have been known for some time. However, these materials have not been widely used in industry. One of the main reasons behind this has undoubtedly been a lack of knowledge and experience with respect to their weldability. Moreover, traditional high strength steels, of the nickel chrome molybdenum type, are known to be difficult to weld, requiring expensive fabrication procedures to guarantee satisfactory production of crack-free welds. This paper presents data on weldability and weldment properties for a group of modern high strength steels (690MPa) primarily intended for naval construction but which may also be suitable for other heavy constructions such as offshore structures. It examines the changes in steel composition and production route and identifies the resultant influence on weldment performance and on the economics of fabrication, in terms of the requirement for less stringent welding precautions during fabrication. In general, it was found that certain modern high strength steels possess balanced and acceptable mechanical and weldability properties in comparison to their older counterparts. This is supported by features such as comparable mechanical properties, reduced hardenability, increased resistance to cold cracking and acceptable HAZ impact performance and resultant HAZ hardness values over the heat input range 1--4 kJ/mm. It has also been demonstrated that by adopting suitable welding procedures, namely a welding preheat level of {approx} 120 C in the case of SAW, or the use of FCAW welding in the absence of preheat, these higher strength steels can be welded successfully.
- OSTI ID:
- 33201
- Report Number(s):
- CONF-930641-; ISBN 0-7918-0785-1; TRN: IM9518%%22
- Resource Relation:
- Conference: OMAE `93: 12th international conference on offshore mechanics and arctic engineering, Glasgow (United Kingdom), 20-24 Jun 1993; Other Information: PBD: 1993; Related Information: Is Part Of OMAE 1993: Volume 3, Part A -- Materials engineering; Salama, M.M.; Toyoda, Masao; Liu, S.; Dos Santos, J.F.; Kocak, M.; Williams, J. [eds.]; PB: 434 p.
- Country of Publication:
- United States
- Language:
- English
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