The Development of 540 MPa Class High Strength Low Alloys Steel for Bridge Structural Application Paper

by Agung Baskoro, Himawan Sutanto

Publisher - Krakatau Steel, Indonesia

Category - Engineering & IT

Indonesia is an archipelago country which needs bridges to connect each island. For the future, Indonesia has planned to build some bridges and others infrastructure. Therefore the demand of steel especially for bridge structure application will increase significantly. Bridges offer great potential for the use of high strength steel grades because higher strength steel material may reduce plate thickness, resulting in significant weight savings. In addition the extra strength of HSLA steel makes it more durable and offers a longer useful life span for bridges. This paper concerns to the development of 540 MPa Class High Strength Low Alloy (HSLA) steel strips specification BSEN S460ML for pylon and deck in bridge structural and construction applications. The addition of solid solution strengthening elements up to 0.3% Ni, 0.2% Cu and grain refinements strengthening elements up to 0.055% Nb, 0.05% V into steel containing 0.07% C and 1.2% Mn, combined with controlled rolling process resulted in high yield strength of 470-570 MPa, tensile strength of 550-630 MPa, and fine ferrite grain size of 4.5 – 9.0 µm. This steel has excellent charpy impact properties up to 200 Joule at -50 OC and also good weldability.

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