Material Besi Adalah

Besi Tuang Nodular (BTN) atau Ductile Iron adalah besi tuang yang mempunyai partikel graft berbentuk bulat. Peningkatan kekuatan material BTN sering dilaksanakan melalui proses perlakuan panas yang lebih dikenal dengan Austempered Ductile Iron (AN), tapi dalam penelitian ini diharapkan bahwa melalui penambahan unsur paduan Al dan Si pada BTN khususnya kelas FCD 50 akan memiliki karakteristik yang mirip, sama atau pun lebih baik dari pada ADI. Di samping itu secara ekonomi, diharapkan dapat menekan biaya manufaktur (manufacturing cost) yang dalam hal ini dibatasi pada perhitungan harga pokok produk untuk satu kali proses peleburan BTN dalam dapur dengan kapasitas 500 kg.

Sampel uji dalam penelitian ini diperoleh dengan komposisi unsur paduan Si 0,5 % - Al 1,5 % ; Si 1,5 % - Al 1,5 % dan Si 3 % - Al 1,5 % menggunakan Y-block standar iTS G 5502. Sedangkan Y-block standar ASTM E-71-64 diperlukan untuk variasi dengan ketebalan dinding cetakan Y-block yaitu 7,4 mm, 8,4 mm, 9,4 mm, 10,4 mm dan 12,5 mm, diperlakukan untuk mengetahui pengaruhnya terhadap karakteristik atau kekuatan mekanis material optimum. Sebagai pembanding path kondisi sampel uji yang sama dengan karakteristik hasil penambahan unsur paduan tersebut, dilakukan proses austemper pada temperatur austenisasi 900 °C. selama 30 menit dan austemper pada 385 °C. selama 30 menit. Sampel uji yang diperoleh kemudian dilakukan pengujian tank, kekerasan, kekuatan impak serta uji komposisi kimia dan pengamatan struktur mikro yang dilaksanakan pada suhu kamar.

Hasil penelitian menunjukkan bahwa jika dibandingkan kondisi as-castnya, penambahan unsur paduan Al 1,5 % - Si 1,5 % dengan ketebalan dinding cetakan Y -block 9,4 mm mampu meningkatkan kekuatan tank dan kekerasan menjadi 73 kg/mm² dan 59 HRA, sedangkan elongasi dan harga impak terjadi penurunan menjadi 4,1 % dan 3,4 J/cm². Hal ini menunjukkan bahwa penambahan unsur paduan Al & Si layak dipertimbangkan sebagai alternatif dalam peningkatan kekuatan material pada proses manufaktur pengecoran tanpa melalui proses perlakuan panas, dimana diperoleh penghematan harga pokok produk sebesar Rp. 8.839,-/kg.

Since 2015 Centralized Procurement System, many of the required outcomes are also reflected keeping the legacy of the existing IITR procurement process and the framework that underpins IITR Purchase & Store Rule, which aligns Material Management activities with broader objectives including prompt response and building procurement capability. There has been a strong achievement in procurement reform and many of the initiatives are embedded and subject to regular review and improvement.

Since 2015 Centralized Procurement System, many of the required outcomes are also reflected keeping the legacy of the existing IITR procurement process and the framework that underpins IITR Purchase & Store Rule, which aligns Material Management activities with broader objectives including prompt response and building procurement capability. There has been a strong achievement in procurement reform and many of the initiatives are embedded and subject to regular review and improvement.

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