Proposal Of Using Higher Tensile Steel HTS-40(390 MPa) On Hatch Coamings Of Open-deckShips

Abstract

The article presents the proposed scope of application of higher tensile steel (HTS), having yield point of 390 MPa, and the involved design and fabrication problems resulting on a structure of open-deck ships hatch coamings. 1 General assumptions as for using HTS-40 steel at building of open-deck ships Due to the growing pressure exerted by Owners in order to improve economic aspect of sea transport, the ship designers have to use higher tensile steels in their ships to a higher and higher degree. The higher tensile steel grades in question are those steel grades that have yield point above 265 MPa, but not exceeding 400 MPa. On the ships built so far in Szczecin Shipyard (Stocznia Szczecinska S.A. SSSA.) mainly steel grades of R,=315 and 355 MPa have been used and all technological problems involved have been overcome. In case of steel grades of 390 MPa, these have never been used so far in SSSA. Higher tensile steel grades are applied in structures of different types of ships for building of high loaded hull structure components characterized by high stress levels, such as strength deck plating and longitudinals, sheer strakes, bottom Transactions on the Built Environment vol 42, © 1999 WIT Press, www.witpress.com, ISSN 1743-3509