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Agus Suprapto
Jurusan Teknik Mesin Fakultas Teknik Universitas Merdeka Malang Jl. Terusan Raya Dieng 62-64 Malang
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Journal : RING Mechanical Engineering

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ANALISIS TEGANGAN DAN REGANGAN PADA KAWAT STAINLESS STEEL 304 HASIL PERLAKUAN HARDENING DAN TEMPERING Sekiwa; Suprapto, Agus; Tsamroh, Dewi Izzatus; Rusdijanto
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21747

Abstract

Currently, the demand for materials, especially metals, is very significant. Iron and steel are inseparable basic needs. However, with diverse needs, the desired mechanical characteristics of a material also vary. These mechanical aspects include hardness, ductility, strength, and toughness. The use of stainless steel is increasing worldwide due to its superior characteristics. One of them is using stainless steel wire. This research aims to identify the tensile strength limit of 304 stainless steel wire with variations in hardening and tempering. The test results show that the unheat treated 304 stainless steel wire has a higher stress value than the heat treated one. The test results show that the stress value in the test object which has undergone heat treatment of hardening at a temperature of 820°C with a holding time of 30 minutes with water cooling and tempering at a temperature of 400°C with a holding time of 20, 30, 40 minutes with air cooling has decreased. This can be compared with raw or untreated specimens which have a stress value of 176.815 kg/mm2. For specimens that underwent the hardening heat treatment process, the stress value decreased to a value of 88.025 kg/mm2. Meanwhile, for test objects that underwent a tempering process, the stress also decreased compared to normal or untreated test objects with stress values ​​for 20 minutes of tempering 87,261 kg/mm2, 30 minutes of tempering 87,261 kg/mm2, and 40 minutes of tempering 87,006 kg/mm2.
INVESTIGASI PENGARUH VARIASI AIR LAUT TERHADAP LAJU KOROSI BAJA ST 37 Djahilepang, Raywantus Baur; Suprapto, Agus; Tsamroh, Dewi Izzatus
RING ME Vol 4 No 1 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rm.v4i1.21765

Abstract

In the current era of globalization, metal has an important role and is a primary need in various aspects of human daily life. One metal that is widely used is steel, which is a mixture of iron (Fe) and carbon (C) with the addition of other ingredients in the modern context. Low carbon steel, such as ST 37, is often used in making components such as nails, bolts and screw threads. The affordability and availability of ST 37 makes it a top choice in the construction industry, although it is often subject to corrosion problems due to its natural properties. In various situations and conditions, the wide use of ST 37 steel often interacts with natural elements, such as sea water, river water, oxygen, pH values, and other environmental conditions. The problem of corrosion is a major concern for many researchers and industry, because it can affect various processes such as cleaning by etching, pickling, and the use of corrosive chemicals such as acids and salts to inhibit corrosion. The test results showed that the highest corrosion rate occurred in Tanjung Perak Surabaya sea water, amounting to 2.817 mpy, while Panjang Pasuruan sand sea water had the lowest corrosion rate of 0.626 mpy.
Perbandingan Laju Korosi dengan Menggunakan Spray Chamber Test dan Corrosion Coupon Rack pada Baja Karbon Rendah Suprapto, Agus; Tsamroh, Dewi Izzatus; Sentosa, Obaja Eden Riyanto
RING ME Vol 4 No 2 (2024): RING Mechanical Engineering
Publisher : Universitas Islam Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33474/rme.v4i2.22887

Abstract

Penelitian ini bertujuan untuk membandingkan laju korosi baja karbon rendah menggunakan dua metode pengujian, yaitu spray chamber test dan corrosion coupon rack. Baja karbon rendah dipilih karena penggunaannya yang luas di berbagai industri, seperti konstruksi dan peralatan, namun memiliki kerentanan terhadap korosi di lingkungan tertentu. Penelitian ini menggunakan metode spray chamber test dengan mensimulasikan lingkungan korosif dengan penyemprotan larutan garam secara terkontrol, sedangkan corrosion coupon rack menggunakan eksposur langsung terhadap larutan korosif dalam kondisi statis. Laju korosi dianalisis berdasarkan perubahan massa spesimen dan dievaluasi menggunakan perhitungan corrosion rate. Hasil penelitian menunjukkan bahwa laju korosi yang dihasilkan oleh spray chamber test cenderung lebih tinggi dibandingkan dengan corrosion coupon rack. Hal ini disebabkan oleh mekanisme penyemprotan yang meningkatkan kontak permukaan spesimen dengan larutan korosif, mempercepat reaksi oksidasi. Sementara itu, corrosion coupon rack menunjukkan laju korosi yang lebih lambat karena kondisi larutan statis yang mengurangi dinamika reaksi.
Co-Authors Achmad Taufik Afriyanti Afriyanti, Afriyanti Agus Iswantoko Andrijono, Djoko Bharata, Risma Wira Catarina Wahyu Dyah Purbaningrum, Catarina Wahyu Dyah Darto, D Dewi Izzatus Tsamroh Dewi Septanti, Rina Djahilepang, Raywantus Baur Ellyta Hadi Sasana Historiawati, H Imsak Rochmadi Irwandi, Jul Viansyah Dwiki Jumiadi, Jumiadi MARIA BINTANG Murti Astiningrum Nasroh, Zahrotul Ulin Negara, Julius Galih Prima nur jannah, eka Nurrohman Fajri, Haru Perdana, Adhi Surya Poerwanto, Andi Pramita, Cynthia Rosa Pungky Eka Setyawan Riyanto, Obaja Eden Sentosa Rusdijanto Sekiwa Siti Rohmah Sonief, Ahmad As'ad Whinarko Juliprijanto Wibowo, Adalia Natarina Widi, Riantin Hikmah Widyastuti, Ike