Bridge Steels - From Iron To High PerformanceSteels

摘要

Many early railway bridges were constructed of cast and wrought iron.Unfortunately, many of these bridges failed due tooverloads or fatigue after only 12 to 30 years of service.In the mid-1850’s, steel became available at reasonable cost and in largequantity for bridge construction.In the past 150 years, bridge steels have progressed from carbon steels to specialty steels, suchas, nickel steels, to high strength low alloy steels, to quenched and tempered high strength steels, and now to high performancesteels for the 21st.Century.