Utilization of RH-vacuum Degassing for Ultra Clean Steel Production at PT Krakatau Steel

oleh Beno Supriyadi, Maulud Hidayat, Jan Tagor

Penerbit - PT. Krakatau Steel, Indonesia

Kategori - Novel Am

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.

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