scholarly journals Effect of Cooling Media on Steel Hardness ST 37 of Conventional Lathe Process

2018 ◽  
Author(s):  
Teknomekanik ◽  
Nelvi Erizon ◽  
M. Iksan Ardiyansyah ◽  
Jasman ◽  
Yufrizal. A
Keyword(s):  
Oil Content ◽  
Hardness Test ◽  
Air Cooling ◽  
Hardness Tester ◽  
Cooling Medium ◽  
Average Hardness ◽  
Spindle Rotation ◽  
Boring Tool ◽  
Cooling Media ◽  
Hardness Values

This study aims to determine the type of air cooling media, soluble oil, and air to the result on lathe ST 37 steel. The cooling medium is very important to maintain boring tool deformation and can add product quality. In the process lathe of friction between the workpiece and chisel cut that can produce overheating and influence on the result of the slice boring tool on the workpiece. The research that will be carried out is experimental research with variables that are controlled that is feeding, deep of a cut, and spindle rotation and examination of the hardness of the specimen on the object before done lathe. The sample in this study which is ST 37 steel with diameter 25 mm and length 60 mm as many as 9 specimens which will be done lathe with different type media kind inprocess working. To know influence the type of cooling medium against steel ST 37 is done brinnel hardeness test using test equipment hardness tester. Of the 9 specimens lathe will be determined 3 points to do hardeness tests. From the result of hardness test and analysis obtained from hardness test on steel ST 37 average data that is use of soluble refrigerant media that produce a very good cooling at the time of the lathe process. The results of research is obtained that the use of soluble refrigerant media is the best with an average hardness of 224.10 kg / mm². On the lathe process, the cooling media has oil content will be able to maintain the scores hardness and time-worn on boring tool. Thus to maintain the hardness values can be used soluble oil cooling media and to increase the hardness values of workpieces can be used air cooling media.

scholarly journals Effect of Cooling Media on Steel Hardness ST 37 On Conventional Lathe Process

Teknomekanik ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 6-11
Author(s):  
Nelvi Erizon ◽  
M Iksan Ardiyansyah ◽  
Jasman Jasman ◽  
Yufrizal A
Keyword(s):  
Oil Content ◽  
Hardness Test ◽  
Air Cooling ◽  
Hardness Tester ◽  
Cooling Medium ◽  
Average Hardness ◽  
Spindle Rotation ◽  
Boring Tool ◽  
Cooling Media ◽  
Hardness Values

This study aims to determine the type of air cooling media, soluble oil, and air to the result on lathe ST 37 steel. The cooling medium is very important to maintain boring tool deformation and can add product quality. In the process lathe of friction between the workpiece and chisel cut that can produce overheating and influence on the result of the slice boring tool on the workpiece. The research that will be carried out is experimental research with variables that are controlled that is feeding, deep of a cut, and spindle rotation and examination of the hardness of the specimen on the object before done lathe. The sample in this study which is ST 37 steel with diameter 25 mm and length 60 mm as many as 9 specimens which will be done lathe with different type media kind inprocess working. To know influence the type of cooling medium against steel ST 37 is done brinnel hardeness test using test equipment hardness tester. Of the 9 specimens lathe will be determined 3 points to do hardeness tests. From the result of hardness test and analysis obtained from hardness test on steel ST 37 average data that is use of soluble refrigerant media that produce a very good cooling at the time of the lathe process. The results of research is obtained that the use of soluble refrigerant media is the best with an average hardness of 224.10 kg / mm². On the lathe process, the cooling media has oil content will be able to maintain the scores hardness and time-worn on boring tool. Thus to maintain the hardness values can be used soluble oil cooling media and to increase the hardness values of workpieces can be used air cooling media.

scholarly journals PENGARUH MEDIA PENDINGIN PADA PROSES HARDENING MATERIAL BAJA S45C

POROS ◽  
2017 ◽  
Vol 14 (2) ◽  
pp. 79
Author(s):  
Syaifudin Yuri ◽  
Sofyan Djamil ◽  
Sobron Yamin Lubis
Keyword(s):  
Impact Test ◽  
Salt Water ◽  
Water Hardness ◽  
Hardness Test ◽  
Hardening Material ◽  
Journal Literature ◽  
Average Value ◽  
Cooling Medium ◽  
Oil Water ◽  
Hardness Values

Abstract: Hardening is the process of heating the steel to a temperature of austenite and then dyeing is done quickly, the process is carried out to improve the properties of steel hardness. The method used in this research using books and journal literature .The purpose of this study to determine the mechanical properties of the steel that is cooled by the cooling medium brine , oil, water and air in the cooling medium to the level of violence after the S45C steel is hardened in a hardening process and microstructure . The study starts from the cutting hardness test specimen with a diameter of 65 mm x 7 mm x 10 mm and impact test with a diameter of 10 mm x 10 mm x 55 mm . The results obtained hardness test salt water has the average value of hardness 95 BHN , the average value of hardness oli 89 BHN , the average value of water hardness 94 BHN , the average value of hardness air 87 BHN and hardness values without in hardening 88 BHN , impact test on the air has an average value 1.175 J/

scholarly journals STUDI KARAKTERISTIK MATERIAL STEM SEPEDA UNTUK PENGEMBANGAN PROTOTIPE STEM SEPEDA BERBASIS LIMBAH PISTON DENGAN VARIASI TEMPERATUR CETAKAN

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Cecep Suganda ◽  
Edi Sutoyo ◽  
Dwi Yuliaji
Keyword(s):  
Room Temperature ◽  
Hardness Test ◽  
Mold Temperature ◽  
Material Characteristic ◽  
Micro Structure ◽  
Average Hardness ◽  
Before And After ◽  
Characteristic Values ◽  
Hardness Values

<p>Bicycle stem is the link between handlebar (handlebar) with steerer tube (fork). Stem one of the bike parts to<br />note and Each type of bike is different for the size and specifications stemnya. This research aims to. Obtained<br />characterization of alumunium casting material as a material for making stem bikes with casting temperature of<br />700 ° C, and temperature variations of room temperature (30 ° C), 100 ° C, 150 ° C, 200 ° C, and characteristic<br />hardness values stem between piston waste material and stem. The piston waste is melted at the melting<br />furnace at a temperature of 700 ° C. then cast into the mold. After obtaining the specimen and then testing the<br />material characteristics include chemical composition, microstructure, and hardness. The result of the research<br />after casting with variation of the molded temperture has different material characteristic values, ie: chemical<br />composition which has no change before and after casting, the microt structure has little porous defect, and the<br />hardness value where the higher the mold temperature the lower the hardness . Conclusions of data processing<br />The highest value of piston recycled hardness is 93 HV when compared to the hardness of 61.2 HV stem bike<br />material, the hardness is more than enough and from the composition test there is a difference of Si 12%<br />composition. Result of micro structure at foundry with 4 variation still have defect of cast (porous and<br />shrinkage). the stam bike hardness test has an average hardness value of 64.2 HV whereas for the hardness<br />value of piston waste casting results show the hardness value of 91 HV with mold temperature 30 ° C, 93 HV<br />with mold temperture 100 ° C, 89 HV with mold temperature 150 ° C, 87 HV with mold temperature 200 ° C. The<br />higher the mold temperature, the lower the hardness of the material.</p>

scholarly journals Pengaruh Media Pendingin Terhadap Kekerasan Baja Tahan Karat Martensitik Type 431 Pada Proses Hardening dan Tempering

2018 ◽  
Vol 1 (02) ◽  
pp. 27-32
Author(s):  
Suyanta Suyanta ◽  
Subagiyo Subagiyo ◽  
Syamsul Hadi ◽  
Zahratul Jannah
Keyword(s):  
Stainless Steel ◽  
Stainless Steels ◽  
Air Conditioning ◽  
Cutting Tool ◽  
High Hardness ◽  
Air Cooling ◽  
Water Cooling ◽  
Cooling Medium ◽  
Hardening Process ◽  
Cooling Media

Stainless steels consist of several types such as Austenitic, Ferritic and Martensitic, Martensitic is one of the stainless steels that has a hardenability property, so it is suitable to be used as cutting tool components which require high hardness and corrosion resistance . The purpose of this study was to obtain information about the hardness of stainless steel martensitic type of hardening results with variations of cooling media. Methods of research used were experiments, ie hardening process by heating the material up to 1100oC temperature, held for 30 minutes, then cooled quickly on water, oil and the air, then heated back to 400oC temperature, cooled slowly, the results tested the hardness of Rockwell C method The results showed the type of stainless steel type martensitic 431 increased significantly after the Hardening process of 21.20 HRC before hardening, and after the hardening process to 47 , 6 HRC with water cooling, 47.9 HRC with oil cooling medium and 46.5 HRC for air cooling media, hardness after tempering down ranges from 6-7 HRC to 41.7 HRC for hardening with water cooling medium 41, 2HRC hardening results with oil cooling medium, and 40,4HRC un tuk hardening results with air conditioning medium.

scholarly journals PENGARUH QUENCHING DENGAN MEDIA PENDINGIN AIR DAN OLI TERHADAP MECHANICAL PROPERTIS BAJA S45C

JTAM ROTARY ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 183
Author(s):  
Deni Setiadi ◽  
Achmad Kusairi Samlawi
Keyword(s):  
Heat Treatment ◽  
High Hardness ◽  
Hardness Test ◽  
Water Cooling ◽  
Test Analysis ◽  
Cooling Medium ◽  
A Value ◽  
Before And After ◽  
Cooling Media

The role of steel in the industrial world today is very important, especially in terms of making components related to violence such as gears, fly wheel, axe, and so forth.This steel has a high hardness for components that require hardness, to uletan and resistance to friction. get hardness and resistance to steel hence need heat treatment process using Quenching process. The material of this research is S45C carbon steel with specimen number 1 for hardness test before treatment and after treatment with rockwell test, this process is done in Central Laboratory of FMIPA UM, unfortunate. In this process heat treatment is carried out at temperatures of 800⁰C and 900⁰C with water and oil cooling medium, from the results of comparative analysis on S45C steel before and after the treatment obtained increased hardness. This can be seen from the test analysis in which 93 kgf of hardness n is for the untreated specimens. At a temperature of 800⁰C with a water cooling medium at a crude value of 94.6 kgf, and on oil cooling medium at a hardness value of 92.5 kgf. At a temperature of 900⁰C with a water cooling medium at a hardness value of 93.5 kgf and on the oil cooling medium at a value of 93 kgf. Can be concluded from all the cooling media is the highest media water with value of violence 94.6 kgf.Keywords: S45C Steel, Quenching, Cooling

The Present and Future of Hardness Standard Blocks

2006 ◽  
Vol 118 ◽  
pp. 457-462
Author(s):  
Takashi Yamamoto
Keyword(s):  
Hardness Test ◽  
Test Methods ◽  
Test Block ◽  
Current Status ◽  
Testing Procedures ◽  
Hardness Tester ◽  
Standard Tool ◽  
Standard Block ◽  
Testing Practices ◽  
Hardness Values

Looking at the current status of hardness standards, we occasionally come across the view that it is sufficient that hardness measurements can be matched somewhat forcibly to the hardness values of standard blocks. However, if the direct accuracy of a hardness tester and indenter and loading conditions are well managed and appropriate testing procedures are taken, the measurement of hardness should naturally agree with the value indicated on a standard block, and “hardness” should be an industrial quantity obtained in that way. Therefore, we should recognize anew the original purpose of a hardness standard block as a standard tool, such as the daily inspection (indirect verification) of a tester and/or whether testing practices are under proper management, as well as to make a comparison between testers and/or between indenters. From this standpoint, we, in the capacity of a dedicated test-block manufacturer, discuss the principles of hardness test methods, the uniformity, durability and trends of hardness standard blocks, and future hardness standards relative to the ISO standards, based on our past results from testing and experiments with a number of standard blocks.

Micro-Hardness and Morphology of LDPE Influenced by Beta Radiation

2014 ◽  
Vol 606 ◽  
pp. 253-256 ◽  
Author(s):  
Martin Ovsik ◽  
Petr Kratky ◽  
David Manas ◽  
Miroslav Manas ◽  
Michal Stanek ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Hardness Test ◽  
Polymer Materials ◽  
Beta Radiation ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Depth Sensing ◽  
Surface Layers ◽  
Hardness Values ◽  
Different Doses

This article deals with the influence of different doses of Beta radiation to the structure and mico-mechanical properties of Low-density polyethylene (LDPE). Hard surface layers of polymer materials, especially LDPE, can be formed by radiation cross-linking by β radiation with doses of 33, 66 and 99 kGy. Material properties created by β radiation are measured by micro-hardness test using the DSI method (Depth Sensing Indentation). Individual radiation doses caused structural and micro-mechanical changes which have a significant effect on the final properties of the LDPE tested. The highest values of micro-mechanical properties were reached at radiation dose of 66 and 99 kGy, when the micro-hardness values increased by about 21%. The changes were examined and confirmed by X-ray diffraction.

scholarly journals PENINGKATAN SIFAT MEKANIS BESI COR KELABU MELALUI PROSES TEMPERING

2018 ◽  
Vol 2 (2) ◽  
Author(s):  
A. Noor Setyo HD ◽  
Sri Widodo
Keyword(s):  
Cold Water ◽  
Hardness Test ◽  
Heating Time ◽  
Initial Energy ◽  
Test Results ◽  
Maximum Hardness ◽  
Quenching Temperature ◽  
Independent Variables ◽  
Hardness Tester ◽  
Water Media

This study aims to determine the Hardness and Toughness of cast iron after undergoing a Tempering process with independent variables heating time and dependent Hardness, microstructure and toughness Impack. Quenching was carried out at temperatures of 7750C, 8000C and 8250C in cold water media, while Tempering was carried out at temperatures of 2000C, 3000C and 4000C with a holding time of 15 minutes. Vickers Hardness test results using "Micro Hardness Tester" after Quenching have increased by an average of 95.6% at Quenching 7750C, 99.8% at Quenching 8000C and 107.1% at Quenching temperature 8250C from Hardness value of row material of 256.6 BHN or 260.8 VHN0,040. The maximum hardness value is obtained 531.4 BHN or 553.6 VHN 0,040 at Quenching temperature 8250C and the lowest Hardness of 501.8 BHN or 541,8 VHN0,040 at Quenching 7750C temperature, has Cementite phase as a matrix with little Martensite, is due to treatment The partial tempering of Martensite is replaced by the ferrite phase between Cementites. The results of the study concluded that at Tempering temperatures of 2000C, 3000C and 4000C, the toughness of FC 30 experienced an increase of 106.5%, 121.9% and 130.5% from the initial energy of 5.21 Joule / mm2, whereas violence decreased by 88, 6%, 80.8% and 40.4% of the original Hardness of 260.8 VHN 0,040

scholarly journals STUDY ON THE EFFECT OF COMPOSITION AND VARIATION OF Sn/Zn COOLING MEDIA ON NICKEL ALLOY STEEL THROUGH HOT FORGING AND AUSTEMPERING

2021 ◽  
Vol 23 (1) ◽  
pp. 37
Author(s):  
Satrio Herbirowo ◽  
Martin Harimurti ◽  
Septian Adi Chandra ◽  
Dedi Pria Utama ◽  
Faried Miftahur Ridlo ◽  
...  
Keyword(s):  
Nickel Alloy ◽  
Alloy Steel ◽  
Nickel Content ◽  
Hot Forging ◽  
Industrial Applications ◽  
Cooling Medium ◽  
Nickel Chromium ◽  
Cooling Media ◽  
The One ◽  
Bainite Microstructure

STUDY ON THE EFFECT OF COMPOSITION AND VARIATION OF Sn/Zn COOLING MEDIA ON NICKEL ALLOY STEEL THROUGH HOT FORGING AND AUSTEMPERING. Laterite steel with nickel content is expected to be a solution to overcome the lack of domestic steel availability and dependence on imports. This research was conducted to develop Nickel-Chromium-Molybdenum alloy steel used Grinding ball for cement industrial applications. Grinding ball is the one of imported steel products needed to be crushing and size reduction the ores or cement. In addition to import issues, grinding balls have a significant problem: their mechanical properties that do not meet SNI 1049 require the material to have a minimum hardness value of 45 HRC. In this study, the characteristics of Nickel alloy steel were investigated further through heat treatment of forgings heated at the austenitizing temperature of 950 °C and austempering with variations in the cooling medium of Sn/Zn solution. The cooling medium was chosen because it has a melting temperature in the phase diagram area to form the bainite microstructure with complex and challenging characteristics, both of which are required in material for grinding ball applications. In particular, the hardness value that passed the SNI 1069 standard was the use of samples with a Cr-Mo alloy of 1%-wt with a hardness value of 45.92 HRC for Sn Austemper and 48.07 HRC for Zn austemper.

scholarly journals PENGARUH NORMALIZING TERHADAP BAJA 20Mn Cr6 HASIL PENGECORAN UNTUK SUPPORT ROLLER

POROS ◽  
2018 ◽  
Vol 16 (1) ◽  
Author(s):  
Yusril Irwan Irwan
Keyword(s):  
Rotary Kiln ◽  
Mechanical Test ◽  
Hardness Test ◽  
Casting Process ◽  
Air Cooling ◽  
Machining Processes ◽  
Support Roller ◽  
Softening Process ◽  
Micro Structures ◽  
Roller Support

Rotary Kiln  machine  is used in fertilizer plant which is function to mix the fertilizer ingredients. Part of the Rotary Kiln is support by using a roller. Support roller is made of 20MnCr6 material, AISI 5120 (0.18% C) with casting process. Normalizing phase on casting processes is using to increase strength of the material The objectives of the normalizes process is to eliminate residual stresses, softening, increasing toughness, homogenization of micro structures and to ease machining processes. The effect of normalizing can be measured by using  mechanical test, ie tensile test, hardness test and microstructure analysis. Test specimens were made the same material with normalizing and without normalizing process. Normalizing process temperature at 900oC heating for 150 minutes with air cooling for 7 hours. The results has shown that normalizing material has lowest tensile strength of 41.05 kgf/mm2 is compared to 42.16 kgf/mm2. However, the ductile fracture is higher 41.2% is compared to 29.52%, the microstructure formed uniformly evenly compared without normalizing. The softening process also makes the roller support rotate due to rubbing with riding ring.

Sign in / Sign up

Export Citation Format

Share Document