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Media Nofri
Program Studi Teknik Mesin Institut Sains dan Teknologi Nasional ISTN Jakarta Selatan
Electrical & Electronics Engineering Engineering

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PERUBAHAN SIFAT MEKANIS DAN STRUKTUR MIKRO BAJA JIS G4051 S15C AKIBAT HARDENING DENGAN VARIASI MEDIA PENDINGIN Media Nofri
Bina Teknika Vol 13, No 1 (2017): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (618.087 KB) | DOI: 10.54378/bt.v13i1.20

Abstract

Testing is an experiment to know the change of mechanical properties and micro structure in JIS G 4051 S 15 C series steel which is previously was cooled with some variation of media such as immersion into water, oil and cooling in free air then the test include: chemical composition, hardness , Impact, Fractography and Metallography. From result of testing the chemical composition with main integer element got result: 0.15% C, 0.157% Si, 1.2% Mn, 0.01% P, 0.02% S. Hardness test results with Vickers method obtained 183 HV for original test object (original) , 182.66 HV for water-cooled test specimens, 190.33 HV cooled with oil and 196.33 HV cooled with air. While in the impact test the toughness value is 0.5 Joule / mm2 for the original test object, 0.39 Joule / mm2 water-cooled test specimens, 0.56 Joule / mm2 oil-cooled specimen, and 0.61 Joule / mm2 cooled test object With free air. In Fractography testing can not be further analyzed the type of fracture, because the photo does not showed the form of cracks or fault plot. While the metallographic results for the original test object or non heat treatment structure is Ferrite and Pearlit, after Hardening the structured remains Ferrit and Pearlit, there is a change in the structure form into Martensit. The mechanical properties generated after the testing process on the JIS G 4051 S 15 C steel have increased the toughness and decreased the hardness so that the steel can be summarize to be more resilient than the original.
ANALISIS SIFAT MEKANIK BAJA SKD 61 DENGAN BAJA ST 41 DILAKUKAN HARDENING DENGAN VARIASI TEMPERATUR Media Nofri; Acang Taryana
Bina Teknika Vol 13, No 2 (2017): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (842.879 KB) | DOI: 10.54378/bt.v13i2.218

Abstract

The alloy steel that is widely used in the world of manufacturing industry is the type of tool steel because it has special characteristics and includes special steel. One type of tool steel that is widely used by the manufacturing industry is SKD steel type 61. ST 41 steel material is a low carbon steel with a carbon content of 0.08% -0.20%. ST 41 steel is commonly used as industrial machine component, but in this ST 41 steel is not as strong as steel SKD 61. So, to improve quality to ST 41 steel. Quality improvement can be done by heat treatment process. To obtain hardness requires the heating process, holding time, cooling medium, precise hardening temperature and see the material comparison between SKD 61 steel and ST 41 steel before and after the hardening process to the nature of hardness and microstructure. Result of hardness test of SKD 61 nonheattreatment steel material has hardness value equal to 197 HV, ST 41 nonheatreatment steel material has hardness value equal to 165 HV, after hardening for temperature 900⁰C has hardness value 154 HV, temperature 950⁰C has hardness value 152 HV, temperature 1000⁰C has 161 HV magnification value. Seen in the metallographic results appear to be a change in microstructure on ST 41 steel which after the hardening structure looks more dominant after the hardening structure turned into bainite-ferrit
ANALISIS SIFAT MEKANIK PIPA CARBON STEEL GRADE A A106 DAN GRADE B A53 UNTUK PROSES PRODUKSI PADA KILANG LNG Media Nofri; Arif Fardiansyah
Bina Teknika Vol 14, No 2 (2018): Bina Teknika
Publisher : Faculty of Engineering UPN "Veteran" Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (682.092 KB) | DOI: 10.54378/bt.v14i2.335

Abstract

This study aims to determine the quality and mechanical properties of carbon steel pipes for the production process at a good liquefied Liquified Natural Gas and after 10 years of use. As a temporary repair reference on damaged pipe. The step is to compare the results of testing the mechanical properties and microstructure of both types of pipes. The parameters used are chemical composition, hardness, tensile strength, and micro structure of both types of pipes. Test results on a good pipe have an average hardness value of 90 HV whereas in the damaged pipe the average hardness value of 85.9 HV decreased by 4.1 HV. The tensile test on a good pipe value of 60kg / mm2 (588 MPa), on a damaged tube of tensile strength of 56 kg / mm2 (549 MPa), decreased 4 kg / mm2 (39 MPa). Good pipe microstructure test results consist of ferrite and pearlite structures while in the damaged pipe consisting of pearlite phase. From the results of the study concluded that the pipeline after the use for 10 years experienced a decrease in mechanical properties, namely: hardness and tensile strength. This is the result of thinning of the corrosion pipe wall thickness.
Co-Authors Acang Taryana Arif Fardiansyah