Ali, Faizah (2023) Analisis Pengaruh Laying Head Temperature dan Base Speed Terhadap Struktur Mikro dan Sifat Mekanik Wire Rod Grade SWRH 82BCr Untuk Aplikasi Prestressed Concrete Strand (PCS). Masters thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Prestressed Concrete Strand (PCS), penyangga beton yang merupakan gabungan dari kawat-kawat baja (wire rod). PCS merupakan salah satu bahan konstruksi yang banyak digunakan dalam industri proyek karena paling andal dan tahan lama. Salah satu grade wire rod yang banyak digunakan untuk aplikasi PCS adalah SWRH 82B karena nilai Tensile Strength (TS) yang tinggi yaitu 1101-1220 Mpa. Namun diperlukan peningkatan sifat mekanik untuk aplikasi yang lebih baik sehingga digunakanlah grade wire rod SWRH 82BCr yang merupakan grade wire rod baja karbon tinggi yang dipadukan dengan Chrom (Cr). Namun, penambahan unsur Cr pada grade SWRH 82B banyak memiliki pengaruh terhadap parameter rolling yang digunakan, dimana semakin banyak kadar Cr maka semakin tinggi nilai Cooling Rate yang digunakan sehingga semakin tinggi Laying Head Temperature (LHT) dan semakin rendah base speed yang digunakan agar Cr berkontribusi maksimal. Tujuan dari penelitian ini adalah untuk mengalisis pengaruh laying head temperature dan base speed terhadap strukturmikro dan sifat mekanik wire rod SWRH 82BCr untuk aplikasi PCS. Penelitian ini dilakukan dengan memvariasikan laying head temperature sebesar 900, 930, dan 960 0C dengan base speed sebesar 0,4; 0,6 dan 0,8 m/s saat proses rolling. Wire rod yang diproduksi kemudian di uji komposisi menggunakan OES-Spectrometer, struktur mikro menggunakan pengujian metalografi, inklusi dan Grain Boundary Cementite (GBC) dan sifat mekaniknya kekuatan tarik meliputi nilai Ultimate Tensile Strength (UTS) dan Reduction of Area (RA). Hasil penelitian menunjukkan bahwa parameter rolling mill terbaik pada wire rod 82BCr untuk aplikasi PCS adalah dengan menggunakan LHT sebesar 900 0C dan base speed sebesar 0.6 m/s karena dapat menghasilkan struktur mikro pearlite halus dan sifat mekanik kekuatan tarik sebesar 1196 MPa dengan RA sebesar 36% yang sesuai dengan aplikasi PCS.
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Prestressed Concrete Strand (PCS), is a concrete support that is a combination of steel wires (wire rod). PCS is one of the most widely used construction materials in the project industry because it is the most reliable and durable. One of the wire rod grades that are widely used for PCS applications is SWRH 82B due to its high Tensile Strength (TS) value of 1101-1220 Mpa. However, it is necessary to improve mechanical properties for better applications, so wire rod grade SWRH 82BCr is used, which is a grade of high carbon steel wire rod combined with Chrom (Cr). However, the addition of Cr to the SWRH 82B grade has a lot of influence on the rolling parameters used, where the more Cr content, the higher the Cooling Rate value used so that the higher the Laying Head Temperature (LHT) and the lower the base speed used so that Cr contributes maximum. The purpose of this study was to analyze the effect of laying head temperature and base speed on the microstructure and mechanical properties of SWRH 82BCr wire rods for PCS applications. This research was conducted by varying the laying head temperature of 900, 930, and 960 0C with a base speed of 0.4; 0.6 and 0.8 m/s during the rolling process. The wire rod produced was then tested for composition using an OES-Spectrometer, microstructure using metallographic testing, inclusions and Grain Boundary Cementite (GBC), and mechanical properties of tensile strength including Ultimate Tensile Strength (UTS) and Reduction of Area (RA) values. The results showed that the best rolling mill parameter on 82BCr wire rod for PCS applications was to use LHT of 900 0C and a base speed of 0.6 m/s because it can produce fine pearlitee microstructure and mechanical properties of tensile strength of 1196 MPa with RA of 36% suitable
for PCS applications.
Item Type: | Thesis (Masters) |
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Uncontrolled Keywords: | PCS, SWRH 82BCr, Laying Head Temperature, Base Speed, Rolling Parameter |
Subjects: | T Technology > TS Manufactures > TS170 New products. Product Development T Technology > TS Manufactures > TS183 Manufacturing processes. Lean manufacturing. T Technology > TS Manufactures > TS205 Metals--Heat treatment. T Technology > TS Manufactures > TS320 Steel--Metallurgy. |
Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 27101-(S2) Master Thesis |
Depositing User: | Faizah Ali |
Date Deposited: | 02 Aug 2023 06:45 |
Last Modified: | 02 Aug 2023 06:45 |
URI: | http://repository.its.ac.id/id/eprint/102132 |
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