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Cilegon, Indonesia

Govindaraju R.,Bandung Institute of Technology | Putra K.,PT. Krakatau Steel
IOP Conference Series: Materials Science and Engineering

Manufacturing execution system is information systems (IS) application that bridges the gap between IS at the top level, namely enterprise resource planning (ERP), and IS at the lower levels, namely the automation systems. MES provides a media for optimizing the manufacturing process as a whole in a real time basis. By the use of MES in combination with the implementation of ERP and other automation systems, a manufacturing company is expected to have high competitiveness. In implementing MES, functional integration -making all the components of the manufacturing system able to work well together, is the most difficult challenge. For this, there has been an industry standard that specifies the sub-systems of a manufacturing execution systems and defines the boundaries between ERP systems, MES, and other automation systems. The standard is known as ISA-95. Although the advantages from the use of MES have been stated in some studies, not much research being done on how to implement MES effectively. The purpose of this study is to develop a methodology describing how MES implementation project should be managed, utilising the support of ISA- 95 reference model in the system development process. A proposed methodology was developed based on a general IS development methodology. The developed methodology were then revisited based on the understanding about the specific charateristics of MES implementation project found in an Indonesian steel manufacturing company implementation case. The case study highlighted the importance of applying an effective requirement elicitation method during innitial system assessment process, managing system interfaces and labor division in the design process, and performing a pilot deployment before putting the whole system into operation. © Published under licence by IOP Publishing Ltd. Source

Syuhada E.,PT. Krakatau Steel
SEAISI Quarterly (South East Asia Iron and Steel Institute)

EAF slag is by product arising in a huge volume in steel making (15-20% of melt capacity). Depending on the steel making process and slag tretment, it contains metal residues. Treatment of these slags used to be difficult and the treatment methods inefficient.Based on the National Regulation, the steel slag (EAF slags) are hazardous wastes catagories. Its shall meet government regulation about the hazardous wastes management, so the steel slags (EAF slags) must be handled and managed meet those regulations. Since 1st December 2008, PT Krakatau Steel used the environmental friendly technology i.e. Slag Atomizing Technology. The slag atomizing technology (SAT) is a new system adopted to atomized molten slag from electric arc furnaces in a highly efficient way. This technology is very economical compared with traditional methods of aging and crushing. The product of the SAT process are spherically shaped with different diameters, socalled PS (Precious Slag) balls. Slag Atomizing technology (SAT) is invented, patented and commercialized by Ecomaister Co., Ltd of Korea. The molten slag is immediately converted to environmental friendly. PS Ball as soon as it is dumped into the SAT system. SAT is a strategic approach to overcome the environmental problem of Electric arc Furnace (EAF) slags. Source

Supriyadi B.,PT. Krakatau Steel | Hidayat M.,PT. Krakatau Steel | Tagor J.,PT. Krakatau Steel
SEAISI Quarterly (South East Asia Iron and Steel Institute)

Nowadays, 'oil and gas' and automotive industries are growing very fast, demanding for products with excellent quality. The challenge that emerges at this field is manufacturing steel products with better and higher mechanical properties, such as yield strength, ductility, toughness, formability, resistance to hydrogen induced cracks, etc. One method to fulfill the requirements mentioned earlier is clean steel production which can be achieved by utilizing RH Vacuum Degassing. PT. Krakatau Steel has been utilizing RH Vacuum Degassing for ultra clean steel production since 1993. It is used to decrease the content of Carbon, Oxygen, Nitrogen and Hydrogen in the molten steel. Along with Ladle Furnace, RH Vacuum Degassing has been used to produce ultra clean steel for oil and gas pipe, automotive parts, enamelware, deep drawing quality steel, and so on. As mentioned above, RH Vacuum Degassing can reduce Carbon, Nitrogen and Hydrogen content by means of decarburization, denitrogenization and dehydrogenization processes. This is conducted by lowering the pressure down to below atmospheric pressure to increase the kinetics of reactions mentioned earlier. To produce steel for sour gas pipeline which is discussed specifically in this paper, the process route applied is EAF - LF - RH - LF - CCM. Dephosphorization occurs at EAF, temperature homogenization is conducted at LF, and then degassing at RH Vacuum Degassing. Next step is desulfurization back at LF and then casting process at CCM. In American Petroleum Institute Standard, sour gas pipe material is designated as API 5LX60SG, with tight requirements in chemical composition and also resistance to Hydrogen Induce Crack (HIC) and Sulfide Stress Corrosion Crack (SSCC) requirements. At 2009, PT. Krakatau Steel has been successful in producing sour gas pipe steel (API 5LX60SG) and receive certifications of HIC and SSCC Testing from Bandung Institute of Technology and DNV Singapore. Source

Baskoro A.,PT. Krakatau Steel | Sumadi,PT. Krakatau Steel | Desrianto A.,PT. Krakatau Steel
SEAISI Quarterly (South East Asia Iron and Steel Institute)

Steels are widely used as raw material in many applications, which one of them is as a raw material for rock bolt in mining application. In Indonesia, the steel for this application is also commonly used since several years ago. Rock bolt is a long anchor bolt, for stabilizing rock excavations, which may be tunnels or rock cuts. Steel for rock bolt application requires not only high strength but also good stiffness and small deflection to ensure the rock bolt does not pull up after being pre-loaded. The requirement of mechanical properties of the steel can be fulfilled by chemical composition adjustment and appropriate controlled rolling. This work is concerned with the development of 540 MPa Class High Strength Low Alloy (HSLA) steel strips for mining rock bolt applications. The addition of small amount of grain refinements strengthening elements up to 0.03% Nb and 0.02% Ti into steel containing 0.17% C and 1.556 Mn, combined with controlled rolling process resulted in high yield strength of 420 - 500 MPa, tensile strength of 560 - 600 MPa, fine ferrite grain size of 3.5 - 4.0 μm and most importantly high stiffness properties has been developed. Source

Bharata H.I.,PT. Krakatau Steel | Desrianto A.,PT. Krakatau Steel | Muslim Z.A.,PT. Krakatau Steel
SEAISI Quarterly (South East Asia Iron and Steel Institute)

Steel for a thick-wall pipeline, especially for oil and gas pipeline application, requires not only high toughness, high strength and good weldability, but also good Bäuschinger effect resistance during pipe manufacturing. The requirement of mechanical properties of the steel can be fulfilled by chemical composition adjustment and appropriate controlled rolling. This work is concerned with the development of High Strength Low Alloy (HSLA) steel strips in terms of low carbon high manganese for thick-wall pipeline applications. The addition of solid solution strengthening elements up to 0.3% Ni, 0.3% Cu, 0.2% Cr, and grain refinements strengthening elements up to 0.06% Nb, 0.08% V into steel containing 0.07% C and 1.2% Mn, combined with controlled rolling process resulted in an excellent impact properties up to 285 Joule at 0 °C, high yield strength of 470-570 MPa, tensile strength of 560-700 MPa, and fine ferrite grain size of 5 μm. A special effort has been addressed to investigate the effect of some microalloys such as niobium, vanadium and nickel on steel microstructures and mechanical properties in terms of improving the Bauschinger effect resistance. The investigation clearly shows that there is no decreasing of yield strength from hot rolled coil to pipe. Source

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