PENGENDALIAN PROSES BAJA KARBON TINGGI DI PABRIK BILLET BAJA PT KRAKATAU STEEL (PERSERO) Tbk, CILEGON HIGH CARBON STEEL PROCESS CONTROL IN BILLET STEEL PLANT OF PT KRAKATAU STEEL (PERSERO) TBK, CILEGON
| Main Authors: | Pertiwi, Riska Asri, Erfiani, _, Kusumaningrum, Dian |
|---|---|
| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Departemen Statistika IPB
, 2013
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| Online Access: |
http://journal.ipb.ac.id/index.php/xplore/article/view/12423 http://journal.ipb.ac.id/index.php/xplore/article/view/12423/9490 |
Daftar Isi:
- Process control is used to guarantee a product/service that was produced to meet certain specification andhas high uniformity over time. Process control generally usesquality control charts that is used to detect the causes ofhigh variability a product. Quality control charts that wasused in this study was Generalized Variance control chart andIndividual Hotelling T2 control chart. The Individual HotellingT2 control chart was done after the Generalized Variancecontrol chart was under control. Based on the results of theGeneralized Variance (GV) control chart and the Hotelling T2control chart using a confidence level of 99.73%, the processof high carbon steel was under control after observations thatwere outside the control limits were removed, which means varianceand average of the process was under control. However,the identification of the previously uncontrolled observationswas done first. One way to determine the variables (elements)that affected the out of control observation was to calculatethe decomposition value of out of control observations. Basedon these values, it indicated that the variables mainly causesout of control observation were Cu, Ni, S, and P.Keywords-Generalized Variance control char; Individual HotellingT2 control chart; out of control observation;