2021 Nashville AISTech

Fundamentals of Alloy and Processing Design for the Successful Production of Ferritic, TiC-Strengthened Ultrahigh-Strength 100-ksi (Yield Strength) Hot-Rolled Steel With Low-Temperature Toughness Through a Flex Mill (Room 208 B)

30 Jun 21
11:00 AM - 11:30 AM

Tracks: Metallurgy - Processing, Products & Applications: Developments in Steel Processing

Speaker(s): Denis Hennessy, Big River Steel; V.S.Y. Injeti, Plant Metallurgist, Big River Steel, a U. S. Steel Company; Jay Martin, Big River Steel; Venkata Natarajan, Plant Metallurgist, Big River Steel; Chirag Mahimkar, Big River Steel - A U. S. Steel Co.; Amar De, Big River Steel – A U. S. Steel Co.

A low-carbon Ti-Nb-microalloyed steel chemistry was designed for the production of ultrahigh-strength hot-rolled steels with 100 ksi minimum yield strength and low-temperature toughness suitable for automotive, agricultural and machinery component applications. Ultrahigh strength was achieved through ferrite grain refinement and very fine TiC precipitation strengthening only. Alloy design and processing approaches were tailored to the dynamics of a continuous hot strip producing line with no interruption to regular production routine. Hot-rolled coils up to 8 mm have been successfully produced so far with enhanced low-temperature toughness and cold bendability.