Paper 9.1 - Steel Innovations Conference 2013 Christchurch-Ver4.pdf

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Structural Steel • 153 years since Bessemer set up a Steel Company in Sheffield • Steel more plentiful, less expensive and available for structures • Open Hearth method used for higher quality steel • Electric Arc and Oxygen processes are modern methods • Late 1800’s, maximum limits for phosphorous, P, & sulphur, S • Early 1900’s impact tests for toughness in use • After WWII increased weldability important • Also need for increased strength, ductility & toughness
Modern Structural Steel • Strengthening structural steel by - grain refinement (reduce size) - solid solution strengthening - precipitation hardening • Increase Toughness & reduce Transition Temp. by - grain size reduction • These achieved by Al treatment, addition of micro-alloying elements, Nb, V & Ti together with controlled rolling.
Page 2 and 3: The Performance and Remnant Life of
Page 4 and 5: Eccentrically Braced Frame (EBF) K
Page 8 and 9: Lamellar Tearing - RBNZ 1974 Sulphu
Page 10 and 11: Certificate of Analysis and Mechani
Page 12 and 13: Hardness Technique Grade 300Mpa ste
Page 14 and 15: EBF - Web Plastic Strain - testing
Page 16 and 17: Hardness versus Normalised Beam Dep
Page 18 and 19: - paint peeled off centre of web -
Page 20 and 21: Toughness of Pre-strained Steel •
Page 22 and 23: Conclusions • Need knowledge of S
Page 26: Tensile Properties -at 10˚C - sign

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