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Trip Steels, High-Performance Steels

Trip Steels
Similar to dual-phase steels, trip steels have emerged as an energy-absorbing
high-strength steel for the automobile. The term ‘‘trip’’ is derived from the mechanism of
transformation induced plasticity. These steels contain a high percentage of retained austenite (10–15%). The austenite transforms to martensite during the forming of the part, thus providing enhanced formability or transforms upon impact in a crash.



High-Performance Steels.
There are a number of high-performance steels that are used in critical applications. These low-alloy steels, such as HY80 and HY100, are used in applications requiring high strength and excellent toughness. The ‘‘80’’ and ‘‘100’’ in the codes represent the minimum yield strength in ksi units. Another family of low-alloy steels is used in heat exchangers, high-temperature piping, and boiler applications. These steels, like 2–1% Cr–1% Mo, find wide use in these applications. Other high-performance steels are the 4 Ni–Cr–Mo steels used as rotors for large steam generators and motors in electric power plants. These steels must withstand temperatures of superheated steam and must maintain high strength, superior toughness, as well as high fatigue strength and creep resistance. The Ni–Cr–Mo–V steels are also used in pressure vessels in nuclear reactors.


Mechanical Engineers’ Handbook: Materials and Mechanical Design, Volume 1, Third Edition.
Edited by Myer Kutz
Copyright  2006 by John Wiley & Sons, Inc.


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