scholarly journals Analisis Radiografi Sinar-X Terhadap Sambungan Pelat Baja Tahan Karat Aisi 304 Hasil Pengelasan Tungsten Inert Gas Dengan Arus 40–60 Ampere

2021 ◽  
Vol 6 (2) ◽  
pp. 12-22
Author(s):  
Ahmad Zayadi ◽  
Sungkono ◽  
Cahyono HP
Keyword(s):  
Welded Joints ◽  
Steel Plate ◽  
Butt Joint ◽  
304 Stainless Steel ◽  
Machine Construction ◽  
Aisi 304 ◽  
X Ray ◽  
Ss 304 ◽  
A Current

X-Ray Radiographic Analysis of Aisi 304 Stainless Steel Plate Joints From Inert Gas Tungsten Welding Results with 40 – 60 Ampere Current. Metal welding process is one of the main processes in machine construction. The quality of welded joints determines the strength and toughness of a machine construction. The quality of welded joints of installed construction can be determined by the non-destructive test method using X-ray radiography equipment. This study aims to obtain a butt joint obtained from TIG welding of AISI 304 stainless steel plate with a current of 40 - 60 A, identification of defects in the 1G butt joint, and analysis of the quality of the weld joint. The research method used is testing of welded joints using X-ray radiography which refers to the ASME V article II standard and the connection quality refers to ASME section IX. The results showed that TIG welding with a current of 60 Ampere produced a butt joint butt joint that was penetrated and there was no gap between the plates, whereas with a current of 40 A and 50 A the weld joint was not see-through but there was still a gap between the plates. Incomplete penetration weld defects were found in the welded SS 304 plate joints with a current of 40 A. Welded porosity defects were found in the welded SS 304 plate joints with a current of 50 A. Weld defects were not found in the SS 304 plate joints with a current of 60 A. Butt joint connections TIG welded SS 304 plate with the best current of 60 A compared to the current of 40 A and 50 A.

Corrosion Behaviour of AISI 304 Stainless Steel with Solar Salt Heat Transfer Fluid

2014 ◽  
Vol 922 ◽  
pp. 13-17 ◽  
Author(s):  
Omar Ahmed ◽  
Le Zhou ◽  
Nahid Mohajeri ◽  
Yong Ho Sohn
Keyword(s):  
Heat Transfer ◽  
Stainless Steel ◽  
Iron Oxide ◽  
Corrosion Behavior ◽  
304 Stainless Steel ◽  
Salt Mixture ◽  
Aisi 304 Stainless Steel ◽  
Aisi 304 ◽  
Solar Salt ◽  
X Ray

In an effort to understand the compatibility between the heat transfer medium and the structural materials used in concentrated solar power plants, the corrosion behavior of AISI 304 stainless steel (18 wt.% Cr, 8 wt.% Ni) in a molten solar salt mixture (53 wt. % KNO3, 40 wt. % NaNO2,7 wt. % NaNO3) has been investigated. The 304 stainless steel coupon samples were fully immersed and isothermally exposed to solar salt at 530°C for 250, 500, and 750 hours in air. X-ray diffraction and scanning electron microscopy with X-ray energy-dispersive spectroscopy were employed to examine the extent of corrosion and identify the corrosion products. Oxides of iron were found to be the primary corrosion products in the presence of the molten alkali nitrates-nitrite salt mixture because of the dissolution of the protective chromium oxide (Cr2O3) scale formed on 304 stainless steel coupons. The corrosion scale was uniform in thickness and chromium-iron oxide was found near the AISI 304. This indicates that the scale formed, particularly on the upper layer with presence of sodium-iron-oxide is protective, and forms an effective barrier against penetration of fused solar salt. By extrapolation, annual corrosion rate is estimated to reach 0.784 mils per year. Corrosion behavior of AISI 304 stainless steel is discussed in terms of thermodynamics and reaction paths.

scholarly journals PELAPISAN PERMUKAAN BAJA TAHAN KARAT AISI 304 DENGAN KHROM OKSIDA MENGGUNAKAN METODA SPUTTERING

2019 ◽  
Vol 25 (2) ◽  
Author(s):  
Sungkono Sungkono ◽  
Jan Setiawan ◽  
Isfandi Isfandi ◽  
Ikhwanul Azis
Keyword(s):  
Base Metal ◽  
Aisi 304 ◽  
X Ray ◽  
Dc Sputtering ◽  
Ss 304

PELAPISAN PERMUKAAN BAJA TAHAN KARAT AISI 304 DENGAN KHROM OKSIDA MENGGUNAKAN METODE SPUTTERING. Baja tahan karat digunakan sebagai bahan struktur reaktor daya tipe LWR, AGR dan LMFBR. Permasalahan bahan struktur yang timbul adalah ketahanan korosi rendah dan swelling dalam lingkungan iradiasi tinggi. Salah satu cara yang digunakan adalah melapisi permukaan kelongsong baja tahan karat dengan khrom oksida. Tujuan penelitian adalah mendapatkan karakter mikrostruktur, kekerasan mikro, dan senyawa yang terbentuk pada lapisan permukaan baja tahan karat AISI 304. Metode  yang digunakan adalah pelapisan permukaan SS 304 dengan metode DC-sputtering. Proses pelapisan menggunakan bahan pelapis berupa target khrom, argon sebagai gas sputter, yang didoping gas oksigen dengan konsentrasi bervariasi dari 0 – 50 %volume, arus 10 – 20 mA, dan waktu 1 - 3 jam. Karakterisasi lapisan meliputi pengamatan mikrostruktur menggunakan mikroskop optik, kekerasan dengan microhardness Vickers tester, dan senyawa dalam lapisan dengan X-ray difractometer. Hasil penelitian menunjukkan bahwa mikrostruktur base metal tersusun dari fasa austenit dan endapan karbida, antarmuka logam-lapisan terlihat jelas, serta lapisan kompak dan homogen dengan ketebalan cenderung naik dalam rentang   0 – 30 %volume, menurun pada 30 – 40 %volume, dan bertambah tebal pada 40 – 50 %volume gas O2  Kekerasan lapisan bertambah tinggi hingga doping gas oksigen 30 %volume, kemudian menurun hingga 50 %volume gas O2. Pada konsentrasi dopan tetap dengan arus 10 – 20 mA dan waktu proses 1 – 3 jam diketahui kekerasan lapisan permukaan SS 304 bertambah tinggi seiring dengan bertambah besarnya arus dan waktu sputtering. Pada konsentrasi dopan 30 %volume O2, arus 10 mA dan waktu 2 jam, lapisan yang terbentuk mengandung CrO2 Kata kunci: Karakterisasi, lapisan permukaan, bahan struktur, SS 304, mikrostruktur, kekerasan, senyawa lapisan.

scholarly journals Pengaruh Variasi Konsentrasi Ekstrak Daun Alpukat (Persea americana M.) Sebagai Inhibitor Pada Baja Tahan Karat SS-304 Dalam Medium Korosif HCl 1M

2019 ◽  
Vol 7 (2) ◽  
pp. 207-214
Author(s):  
Windy Mustika Sari ◽  
◽  
Syafriadi Syafriadi ◽  
Ediman Ginting Suka ◽  
◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosive Medium ◽  
Persea Americana ◽  
304 Stainless Steel ◽  
Inhibitor Concentration ◽  
X Ray ◽  
Inhibitor Efficiency ◽  
Three Samples ◽  
Weight Method ◽  
Ss 304

Avocado leaves extract (Persea americana M.) is used as an inhibitor to the sample of SS-304 Stainless steel which cures in HCl 1M Corrosive Medium for 168 hours, the inhibitor concentration variation added 0%, 2%, 4%, 6%, 8% and 10% respectively. The rate sample is measured by using lose-weight method. The results show the lowest samples is 0,37 mm/y of 6% and the highest 10,75 mm/y of 0%. Inhibitor efficiency to the sample SS-304 Stainless steel potrays the effectively progress to 96,55% with 6% concentration. X-Ray Diffaraction Results accquired BCC and FCC with Fe-a dan Fe-g phase along with SEM that forms agglomeration, cracked, and hole which result on its corrosion. In addition EDS contains Oxygen (O) and Chlorine (Cl) Element which indicate that stainless still has affected by corrotion. Thus from three samples which characterized and measured show that avocado leaves effectively as an inhibitor to the sample SS-304 stainless steel in HCl 1M corrosive medium

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