[ Infrastructure ]
[ Infrastructure ]
The Sant Fruitós Pedestrian Bridge , Barcelona , Spain , has a tilted-arch design . It is built with a combination of Forta LDX 2101 and GFRP ( glass fibre reinforced polymer ).
what is probably the first road bridge made of duplex ( grade 2205 ), at Cala Galdana in Minorca , Spain . This was one of many examples in which outstanding beauty was allied to functionality . Dynamic , fluid designs became the order of the day , such as tilted arches and curved decks . The complexity that it is possible to achieve can be seen in the double-helix designs of the Helix ( Singapore , 2009 ) and Arup ’ s Christopher Cassaniti Bridge ( 2020 ). Colour and texture often play an important role , along with the play of light and changing weather and water conditions . For instance , the Sölvesborg Bridge ( 2013 ), Europe ’ s longest pedestrian / bicycle bridge , has been widely praised for its graceful design ( deck support , railings , and arches in Forta LDX 2101 ) and spectacular lighting .
Grade 410 and its derivatives Another important grade in bridge construction is 410 and its derivatives .
Grade 410 is a martensitic-ferritic dualphase metal known for its hardness and its resistance to mild corrosion . First developed in the 1970s by Columbus Steel , it was applied as rebar in two bridges built in Durban , South Africa , and , as SUS 410 , in the Nou Road Bridge in Japan ( 2012 ). The patent was bought by ArcelorMittal in 1991 , where it was known as Duracorr ® . In the USA , where Arcelor had a manufacturing base , it was specified as ASTM A1010 before being incorporated into the ASTM A709 specification in 2017 . Thenceforward it has been known by its current name ,
ASTM A709 Grade 50CR . US end-users started to specify 50CR for bridges where time-of-wetness and chloride exposure were too high to allow painted carbon steels or weathering steels to be used . In 2004 , 50CR was applied to welded plate girders on the Fairview Road Bridge in California ; it was the first time the grade had been used on US bridges . Since then , about ten other bridges using 50CR have been built in the USA ( including one at the ArcelorMittal works itself ) and two in Canada . The alloy received a big boost after tests were carried out to see
Table . PREN values of 50CR compared with duplex stainless steels
Material type
PREN range ASTM A709 Grade 50CR 11-13 Grade 2304 ( UNS S32304 ) 22-30 Grade 2202 ( UNS S32202 ) 25-27 Grade 2101 ( UNS S32101 ) 25-29 Grade 2205 ( UNS S32205 ) 34-38
The Christopher Cassaniti Bridge , New South Wales , Australia , for which Outokumpu supplied 80 tons of bead-blasted 2205 duplex stainless steel plates . Photo : Arup .
www . stainless-steel-world . net Stainless Steel World December 2023 17