Yield Improvement of the Hot Rolles Sted Steel Coil Industry

Abstract

The objective of the thesis is to develop and improve the yield of the hot rolled steel product by reducing and improve the failure from inefficient managing the scraps. The scope of the research is limited to the improving yield for the product MScode001 in the melting process The research starts from the study the melting production system include scraps handling system. It was found that the original mixing the scrap lead to low yield as well as handling the material that is lack of the experience result in receiving the low quality of the scrap mixing lead to low quality of the molten steel The problemsdivided into two parts, 1) Hiring the subcontractor to handling the raw material especially scrap and 2) lmproving the pattern of mixng the scrap from 4-basket pattern to 2-basket pattern for receiving the suitable density Results from comparison between before and after improvement showed that 1) the yield increased from 75 percent to 85 percent 2) flux utilization decreased from 7200 kg/heat to 5200 kg/heat 3) T-T-T time reduced from 83 minutes/heat to 74.24 minutes/heat 4) Electrical energy used reduced from 517 KwH/ton to 430.39 KwH/ton and 5) Production per month increased by 20.41 percent from the past.