• Title/Summary/Keyword: SS400

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A Study on SS400 Cutting Characteristics using Continuous Wave Fiber Laser (연속파 파이버 레이저를 이용한 SS400의 절단 특성에 관한 연구)

  • Oh, Yong-Seok;Lee, Ka-Ram;Park, Eun-Kyeong;Yoo, Young-Tae
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.21 no.4
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    • pp.644-650
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    • 2012
  • This paper show the 2kW fiber laser cutting properties of SS400. The study was comparison of traditional 4kW $CO_2$ Laser cutting and 2kW Fiber laser cutting characteristics for the application of Industrial 2D Laser Cutting Machine. The laser used in this investigation was an IPG YLU-2000 multi-mode Ytterbium Fiber machine with a maximum power of 2000W and a wave length of 1070 nm. The laser was used in its Continuous Wave (CW) mode with an approximately top hat beam intensity distribution. Fiber laser high quality cuts at a large range of speeds (ranging from 2000 to 3800 mm/min) which has been obtained for the 2.3mm Sheet of SS400. 2kW power Fiber laser cut was able to max. 20mm sheets of SS400 (speed range from 650 to 850 mm/min). Fiber laser cutting used in conventional hole nozzle could cut 12mm SS400 but used in special dual cutting nozzle could cut 20mm SS400.

Study on the Crevice Corrosion Behavior of SS 400 in Marine Environment (해양환경중에서 SS400강재의 간극부식거동에 관한 연구)

  • 임우조;정기철;안석환;윤병두
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.1-6
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    • 2000
  • This paper was studied on the crevice corrosion behavior of SS 400 in marine environment. In 0%, 2%, 3.5%, 5% NaCl solution, the aspect of the crevice corrosion and polarization behavior under the crevice corrosion was investigated. And Weight loss rate of SS 400 with crevice and non-crevice was measured according to the NaCl concentration. The main results obtained are as follows : 1) Under crevice corrosion, the corrosion potential become less noble as the concentration of NaCl solution increased. 2) The current density under open circuit potential was high drained as concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, the current density was low drained. 3) The weight loss rate of SS400 was increased as concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, that of SS400 was decreased.

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Study on the Characteristics of Crevice Corrosion Prevention of SS 400 in Marine Environment (해양환경 중에서 SS400강재의 간극부식방지 특성에 관한 연구)

  • 임우조;정기철;구영필;윤병두
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • pp.152-157
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    • 2001
  • This paper was studied on the characteristics of crevice corrosion prevention of SS 400 in marine environment. In NaCl solution, polarization behavior under the crevice corrosion was investigated. And Weight loss rate of SS 400 applied cathodic protection and non cathodic protection was measured according to the NaCl concentration. The main results obtained are as follows : The weight loss rate of Al-alloy galvanic anode was increased as the concentration of NaCl solution increased by 3.5% but the concentration increased over 3.5%, that of Al-alloy galvanic anode become decreased. The protective potential of SS 400 used Al-alloy galvanic anode becomes more cathodic polarization with increasing concentration of NaCl solution. Effects of oxygen on the weight loss rate of Al-alloy sacrificial anode for cathodic protection as the concentration of 3.5% NaCl solution become sensitive than that of 0% NaCl solution.

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Material Degradation in KS D 3503 SS400 Rolled Steel at $179^{\circ}C$ (KS D 3503 SS400 압연강 $179^{\circ}C$에서의 재질열화 연구)

  • Baek, Un-Bong;Park, Jong-Seo;Nahm, Seung-Hoon
    • Journal of the Korean Society of Safety
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    • v.21 no.4
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    • pp.13-18
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    • 2006
  • In spite of frequent defect in industrial boilers, life assessment or diagnostic method for them has not been actively studied. In this research, SS400 carbon steel used in industrial boilers is simulated with artificial aging heat treatment. To do qualitative life assessment, differences in micro-structures and hardness of SS400 by the degradation time are studied. In addition, variation in material properties by aging was observed with the tensile test at room temperature and $179^{\circ}C$ and changes in ductile to brittle transition temperature was observed with the charpy impact test performed at several test temperature.

An Experimental Study of Concussion Blasting for Structural Steel (구조용 강재에 대한 폭파절단실험 연구)

  • Yang, Hyung-Sik;Jang, Hyong-Doo;Ko, Young-Hun;Kim, Sung-Jun;Moon, Hee-Sook
    • Explosives and Blasting
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    • v.29 no.1
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    • pp.27-33
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    • 2011
  • Concussion shots were conducted for SS400, a general structural steel, and SM490, a structural steel for welding, using TNT, which is used as a standard explosive. The ability to cut the steels was compared for different combinations of charges and materials. The results show that the amount of explosives used for SM490 requires more 30% than SS400.

Evaluation of Microstructure and Mechanical Properties of Friction Stir Lap Jointed Inconel 600/SS 400 (겹치기 마찰교반접합된 Inconel 600/SS 400 합금의 미세조직과 기계적 특성 평가)

  • Song, Kuk-Hyun;Nakata, Kazuhiro
    • Korean Journal of Materials Research
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    • v.22 no.3
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    • pp.123-129
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    • 2012
  • The microstructures and mechanical properties of friction stir welded lap joints of Inconel 600 and SS 400 were evaluated; friction stir welding was carried out at a tool rotation speed of 200 rpm and welding speed of 100 mm/min. Electron back-scattering diffraction and transmission electron microscopy were introduced to analyze the grain boundary characteristics and the precipitates, respectively. Application of friction stir welding was notably effective at reducing the grain size of the stir zone. As a result, the reduced average grain size of Inconel 600 ranged from $20{\mu}m$ in the base material to $8.5{\mu}m$ in the stir zone. The joint interface between Inconel 600 and SS 400 showed a sound weld without voids and cracks, and MC carbides with a size of around 50 nm were partially formed at the Inconel 600 area of lap joint interface. However, the intermetallic compounds that lead to mechanical property degradation of the welds were not formed at the joint interface. Also, a hook, along the Inconel 600 alloy from SS 400, was formed at the advancing side, which directly brought about an increase in the peel strength. In this study, we systematically discussed the evolution of microstructures and mechanical properties of the friction stir lap joint between Inconel 600 and SS 400.

Development of Microstructure and Mechanical Properties of Friction Stir Lap Jointed Invar 42/SS 400 (겹치기 마찰교반접합된 Invar 42/SS 400 합금의 미세조직과 기계적 특성 발달)

  • Song, K.H.;Nakata, Kazuhiro
    • Journal of Welding and Joining
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    • v.30 no.5
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    • pp.34-39
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    • 2012
  • This study was conducted to investigate the microstructure and mechanical properties of friction stir lap joints. Invar 42 and SS 400 were selected as the experimental materials, and friction stir welding was carried out at a tool rotation speed of 200 rpm and welding speed of 100 mm/min. The application of friction stir welding to Invar 42 effectively reduced the grain size in the stir zone; the average grain size of Invar 42 was reduced from $11.5{\mu}m$ in the base material to $6.4{\mu}m$ in the stir zone, which resulted in an improvement in the mechanical properties of the stir zone. The joint interface between Invar 42 and SS 400 showed a relatively sound weld without voids and cracks, and the intermetallic compounds with $L1_2$ type in lap jointed interface were partially formed with size of 100 nm. Moreover, the hook in the advancing side of Invar 42 was formed from SS 400, which contributed to maintenance of the tensile strength. The evolution of microstructures and mechanical properties of friction stir lap jointed Invar 42 and SS 400 are also discussed herein.

Investigation of Corrosion Characteristics with Zn, PTFE Hybrid Coating for SS400 in Sea Water (Zn, PTFE 복합 코팅에 의한 SS400 강의 해수 부식 특성 변화 연구)

  • Han, Min Su;Prak, Jae Cheul;Jang, Seok Ki;Kim, Seong Jong
    • Corrosion Science and Technology
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    • v.10 no.6
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    • pp.205-211
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    • 2011
  • The severe corrosion environment makes the steel product lifecycle short while Cu-alloys with anti-corrosion characteristic used in sea water are too expensive. This study shows that the Cu-alloy(Cu-37.25% Zn-0.67%Al) used in sea water environment can be superseded by SS400 with various coating process, evaluating electrochemical characteristics. Three coating processes were applied to SS400 such as PTFE + Zn coaing, Zn + PTFE coating and only Zn electrogalvanizing coaing. Various electrochemical experiments such as open circuit potential measurments, potentiodynamic polarization tests and analyses of Tafel constants. Mechanical properties were also measured by tensile test and hardness tests. As a result, Zn + PTFE coating for SS400 steel presented the excellent anti-corrosion characteristic in sea water.