TY  - BOOK
AU  - Khan, Waheed Qamar
TI  - Study of Controlled Processing to Produce High Yield Strength in Low Carbon Steel Strip (M.Sc.Thesis)
U1  - 669.142 
PY  - 1995///
CY  - Karachi : 
PB  - Institute of Materials Sciences and Research Pakistan Steel, 
KW  - Carbons in Metal Thesis
KW  - Metallurgy Thesis
N1  - NN
N2  - Abstract:

Parameters related to controlled processing are thoroughly studied. This research study will present the main features involved in the control of the manufacture of hot rolled high yield strength steels and will outline some of the general properties that could be achieved. Commercially produced hot rolled grades at Pak. Steel have a yield strength of the order 350 N/mm² while during this work specially produced grade with vanadium upto 0.08% have yield strength equal to 478 N/mm². The increased yield strength is a result of grain refinement and precipitation strengthening mechanism. These steels are produced by basic steel making and a sophisticated laminar flow cooling system is employed following hot strip rolling to develop the required yield strength.
This research study includes the recommendations about high reheating temperatures, high finishing temperatures and low coiling temperatures to improve the properties of the product.

This work also attempts to summarize the role of vanadium at various stages of controlled processing. Because higher mill loads can develop during rolling on the hot strip mill which can encroach on mill limits so there is a need of interpretation of hot strength during the interstand period. 

This work will also reveal that strict control of the chemical analysis and subsequent processing of these steels ensures that they possess good formability and a high level of consistency in use. In addition such steels also exhibit useful properties in terms of weldability and low-temperature impact strength.
ER  -