Properties of low carbon aluminum killed steel

Effect of hot rolling process on microstructure and properties of low carbon aluminized steel.

Produced by TSCR technology

Paul, Ahmed and Megahead

(Submitted on 29 October 2009/KLOC-0; Revised version 438+00 on April 27th, 1965)

Low-carbon aluminized steel is manufactured by thin slab continuous casting and rolling technology (S.K. Paul, U.Ahmed, G.M. Megahed.

Submitted on June 29th, 2009 and revised on April 27th, 2000)

Hot rolled strip of low-carbon aluminum killed steel for direct forming, cold rolling and galvanizing applications is produced by thin slab continuous casting and rolling (TSCR) technology with similar chemical composition of Ezz flat steel (EFS).

The chemical treatment process of low-carbon hot-rolled strip steel used for direct forming, cold rolling and galvanizing is similar to that of thin slab continuous casting and rolling of flat steel in Aichi Iron and Steel Company.

By controlling the hot rolling parameters, and then controlling the precipitation and growth of AlN, the mechanical and microstructure properties of hot rolled steel strips with different uses can be obtained.

By controlling the hot rolling parameters and the growth of precipitates and aluminum nitride accordingly, the expected mechanical and microstructure properties of hot rolled strip can be obtained for different applications.

Nitrogen in solid solution strongly affects the yield strength (YS), ductility, strain aging index (SAI) and other formability of steel.

Nitrogen in solid solution seriously affects the formability of steel such as yield strength, ductility and strain index.

The equilibrium solubility and isothermal precipitation of AlN in austenite at different temperatures were studied. In order to realize the formability of direct forming, the soluble nitrogen is fixed as AlN by winding the strip at a higher temperature.

We studied the solubility of austenitic aluminum nitride at different temperatures and the precipitation during isothermal process. In order to obtain formability for direct molding, steel bars are coiled into a spiral shape at high temperature and filled with soluble nitrogen as aluminum nitride.

For strict cold forming, boron is added in a stoichiometric ratio lower than that of nitrogen, which significantly improves the formability.

For cold forming, boron and nitrogen are mixed in an ideal ratio, which greatly improves the formability.

The requirements of hot rolled strip processed into cold rolled and annealed deep drawing sheet are high SAI and fine grain structure.

Requirements for cold rolling and hot rolling of annealed deep-drawn sheet processed into high index and granular structure

Higher finishing temperature and lower coiling temperature are used to achieve these goals.

The above goal has not been achieved, and higher rolling and lower coiling temperature are needed.

Fully processed cold-rolled steel plates made of these hot-rolled steel strips sent by customers show good formability.

From these cold-rolled plates, which are completely processed by hot-rolled strip steel, customers feedback that they have good formability.

It is found that the fracture marks observed in some coils during uncoiling are related to the yield phenomenon.

On some coils, we have observed the trace of rolling cracks, which is related to the buckling phenomenon.

It is found that peak height (the difference between upper and lower yield stress) and yield elongation (YPE) are the key material parameters of fracture trace.

The height of the peak (the yield stress difference between the upper and lower parts) and the extension of the yield point are the main material characteristics that lead to fracture marks.

The factors affecting these parameters have been studied and the coiling temperature has been optimized to overcome this problem.

The factors affecting these parameters have been studied, and we will optimize the coiling temperature to overcome this problem.