Development of Nanoprecipitation-Strengthened Cold-Rolled Batch-Annealed HSLA Coated and Uncoated Sheet Steels (>550 MPa Yield Strength) With Superior Formability

A low-carbon Ti-microalloyed chemistry was selected for the development of a family of cold-rolled and batch-annealed high-strength high-formable uncoated and coated steels. The batch annealing practice was optimized to retain precipitate strengthening in the final fully processed steel and microstructural attributes that resulted in superior forming characteristics. Cold-rolled fully processed sheet steel was galvanized and the processing conditions were adjusted to retain mechanical properties attained after batch annealing. Production strategy, material characterization and formability of high-strength low-alloy steels with minimum yield strength of 550 MPa uncoated and coated sheet steel will be discussed, and results will be presented.

Authors:

Siddhartha Biswas | Big River Steel – A U.S. Steel Company
 

Shobhit Bhartiya | Big River Steel – A U. S. Steel Company
 

Dr. William Williams | Big River Steel – A U. S. Steel Company
 

Dr. V.S. Yashwanth Injeti | Big River Steel – A U. S. Steel Company
 

Dr. Amar De | Big River Steel – A U. S. Steel Company
 

Session Chairs:

Siddhartha Biswas | Big River Steel
 

Nilesh Kumar | University of Alabama
 

Vignesh Nallasivam | Tata Steel International (Americas) Inc.