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용접방향에 따른 오스트나이트계 스테인리스강(STS304L) 용착금속파단 용접접합부의 내력에 관한 실험적 연구
김태수,이후창,황보경,조태준 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 논문집 Vol.22 No.1
Austenitic stainless steels have excellent corrosion resistance, durability and fire resistance. Especially, since STS304L among austenitic types is a low-carbon variation of STS304 and has excellent intergranular corrosion resistance, it can often be used under the welded condition without heat treatment after field welding. This paper investigated ultimate behaviors such as ultimate strength and weld metal fracture mechanism of STS304L fillet-welded connections with TIG(tungsten inert gas) welding through test results. Main variables of specimens are weld length and welding direction against loading. Fracture of specimens are classified into three modes(tensile fracture, shear fracture and block shear fracture). Ultimate strengths were compared according to the welding direction and weld length and TFW series with transverse fillet weld had the highest strength compared with other types(LFW series with longitudinal fillet weld and FW series with all round weld). It is known that current design specifications such as KBC 2016 and AISC2010 underestimated the strength of TFW and LFW specimens and provided unconservative estimates for FW specimens. Finally, strength equations were proposed considering material properties of STS 304L material. 오스테나이트계 스테인리스강은 우수한 내식성, 내구성 및 내화성을 지닌다. 특히, 오스테나이트계 스테인리스강중의 대표인 STS304에 비해 저탄소를 함유하고 있는 STS304L은 현장용접 후 별도의 열처리 없이 높은 내입계부식성능을 지니고 있어 용접후 내입계 부식이 우려되는 부재 접합에 적용할 수 있다. 본 연구에서는 티그(TIG)용접으로 필릿 용접된 STS304L 용접접합부의 용접재(용착금속부) 내력과 파단 메카니즘을 조사하고자 한다. 주요변수인 하중방향에 대한 용접선의 배치에 따라 TFW(하중직각방향 용접), LFW(하중방향용접), FW(하중방향용접과 하중직각방향 용접조합)시리즈의 실험체를 제작하여 인장실험을 실시하였고, 각각 인장파단,전단파단, 블록전단파단(인장파단과 전단파단의 조합)이 발생하였다. 동일 용접길이에 대해 TFW 시리즈의 접합부가 가장 높은 내력을 나타났으며, 현행기준식( KBC2016/AISC2010)과 기존 연구자의 식에 의한 예측내력과 비교한 결과, TFW와 LFW접합부는 과소평가되었고 FW실험체는 과대평가되었다 .실제 파단 위험단면과 블록전단파단 메카니즘을 고려한 내력식을 제안하였다.
침의 재료인 스테인리스강 STS304 및 STS316의 생체적합성에 대한 고찰
황의형 ( Eui Hyoung Hwang ),구성태 ( Sung Tae Koo ),이인환 ( In Hwan Lee ),이민호 ( Min Ho Lee ),장인수 ( In Soo Jang ) 대한경락경혈학회 2007 Korean Journal of Acupuncture Vol.24 No.1
Objectives: To discuss the biocompatibility of stainless steel for using acupuncture needles. Results and Conclusions: It is widely assumed that stainless steel is one of the good corrosion-resistant materials and is safe for human body. Most of metal acupuncture needles are made of STS304 and STS316 stainless steel. However, it has been claimed that there are differences between STS304 and STS316 in light of human body safety: STS304 is more vulnerable to oxidation than STS316. A variety of literature survey showed that although STS316 is more corrosion-resistant than STS304 there is no evidence supporting the hypothesis that STS304 has the potential danger to human body. Further study would be necessary to draw more decisive conclusion.
강흥주(HEOUNG-JOO KANG),남기우(KI-WOO NAM),안석환(SEOK-HWAN AHN),강창룡(CHANG-YONG KANG),도재윤(JAE-YOON DO),박인덕(IN-DUCK PARK) 한국해양공학회 2003 韓國海洋工學會誌 Vol.17 No.2
The corrosion resistance of super duplex stainless steel on both its fibrous and dispersed phases was investigated. These structures consist of various volume fraction and distribution of austenite structure, which were obtained by changing the heat treatment temperature and cycle. The fibrous phase had higher austenite volume fraction than that of the dispersed phase at the same temperature. Corrosion resistance of super duplex stainless steel was evaluated through an immersion test and an impingement test, using 35% HCl and sea water, respectively. Super duplex stainless steel was compared with STS316L and STS304. The corrosion resistance of super duplex stainless steel was superior to STS316L and STS304. The dispersed phase of super duplex stainless steel was more stabilized than the fibrous phase in corrosion. The magnitude of corrosion rate was in order STS304, STS316L, fibrous phase of super duplex stainless steel and dispersed phase of super duplex stainless steel.
스테인리스강 소방분야 적용 확대를 위한 소화전함 실물 성능시험에 관한 연구
임우섭(CW.S. Lim),김재훈(J.H. Kim),박승근(S.G. Park),오재성(J.S. Oh),장동하(D.H. Jang),홍승태(S.T. Hong),정재한(J.H. Joeng),박영기(Y.K. Park) 한국화재소방학회 2022 한국화재소방학회 학술대회 논문집 Vol.2022 No.추계
소방용품은 긴급한 화재상황에서 언제든 정상작동을 해야한다. 특히, 해안이나 터널 등 열악한 환경에서도 제 기능이 발휘될 수 있도록 설계되어야 하므로 내식성과 내구성, 내열성이 뛰어난 소재를 사용하는 것이 타당하다. 현재 소방분야에서는 STS304(18Cr-8Ni-Fe)를 많은 설비에 적용하여 사용하고 있으나, Ni의 가격변동성으로 인해 국내 소방 업체들이 받는 영향이 불가피한 상황이다. 이에 원재료 가격 인상 등의 영향을 최소화할 수 있는 신재료의 개발이 요구되고 있다. 따라서, 본 연구에서는 Ni의 대체재로 질소를 활용하여 개발된 신강종 STS290을 소방장비에 적용해보고자 한다. STS290은 STS304에 비해 경제적인 부분에서 안정적이지만, 아직 STS290을 적용한 소방장비의 내식성을 연구한 자료 및 결과는 없는 상황이다. 이를 위해 STS290으로 시편 및 소화전함을 제작하여 내식성확인시험과 폭로시험을 진행하여 소재의 성능을 확인하고자 한다. STS201, STS304로 제작된 시편 및 소화전함을 통해 비교분석 하였으며, 제작된 시편은 용접이나 타공 등의 가공부를 포함한다. 이를 통해 STS290과 STS304의 내식성을 보다 면밀히 비교할 수 있을 것이다. 내식성확인시험은 가속노화시험, 제설염모사시험, 가스부식시험을 진행하였으며, 폭로시험은 옥외폭로시험과 터널폭로시험을 진행하였다. 본 시험 결과를 통해 재료 사용가능 유무를 검토할 수 있으며, 향후 STS290에 대한 다양한 연구가 필요할 것이다.
고온 저주기 피로에 의한 STS 304 압연강재의 특성연구
김치환 ( C. H. Kim ),박영민 ( Y. M. Park ),배문기 ( M. K. Bae ),신동철 ( D. C. Shin ),김대원 ( D. W. Kim ),김태규 ( T. G. Kim ) 한국열처리공학회 2019 熱處理工學會誌 Vol.32 No.1
In this study, strain-controlled low cycle fatigue test for hot rolled STS304 steel was carried out at 400oC and 600oC, respectively. High temperature fatigue test was done using an electric furnace attached on the hydraulic fatigue test machine. The results of this study show that STS304 hot rolled steel has excellent static strength and fatigue characteristics. The hysteresis loop at half life was obtained in order to calculate the elastic and plastic strain. Also, Relationship between strain amplitude and fatigue life was examined in order to predict the low cycle fatigue life of STS304 steel by Coffin-Manson equation. (Received January 7, 2019; Revised January 14, 2019; Accepted January 24, 2019)
STS 304 스테인리스강의 대기중 1050~1200˚C, 1시간 동안의 산화
Thuan Dinh Nguyen,이동복 대한금속·재료학회 2009 대한금속·재료학회지 Vol.47 No.4
The STS304 stainless steel was oxidized isothermally and cyclically at temperatures between 1050 and 1200˚C for 1 hr in air. During isothermal oxidation, it displayed good oxidation resistance at 1050˚C. However, it suffered from breakaway oxidation above 1100˚C, being accompanied with internal oxidation. During cyclic oxidation, it also displayed good oxidation resistance at 1050˚C, but it suffered from massive weight loss above 1125˚C. The oxide scales formed consisted primarily of Fe2O3, Fe3O4 with and without Cr2O3. They were generally non-adherent.
STS 304 스테인리스강의 대기중 1050~1200℃, 1시간 동안의 산화
이동복 ( Dong Bok Lee ),( Thuan Dinh Nguyen ) 대한금속재료학회 ( 구 대한금속학회 ) 2009 대한금속·재료학회지 Vol.47 No.4
The STS304 stainless steel was oxidized isothermally and cyclically at temperatures between 1050 and 1200℃ for 1 hr in air. During isothermal oxidation, it displayed good oxidation resistance at 1050℃. However, it suffered from breakaway oxidation above 1100℃, being accompanied with internal oxidation. During cyclic oxidation, it also displayed good oxidation resistance at 1050℃, but it suffered from massive weight loss above 1125℃. The oxide scales formed consisted primarily of Fe2O3, Fe3O4 with and without Cr2O3. They were generally non-adherent.
STS304L 캡슐의 펄스형 GTA 용접에서 용접변수들이 용접부 형상에 미치는 영향
이형근,한현수,손광재,Lee, Hyoung-Keun,Han, Hyon-Soo,Son, Kwang-Jae 대한용접접합학회 2007 대한용접·접합학회지 Vol.25 No.5
The aim of this paper is to investigate the effects of welding parameters on the weld shape in seal-welding of STS304L capsule for manufacturing a radioisotope source which is widely used in nondestructive testing of metal structures using gamma ray. Pulsed gas tungsten arc (Pulsed GTA) welding is performed for thin cross sectional area of the capsule. Seven welding parameters including current waveform parameters and arc length etc. are selected as main process parameters using design of experiment. The weld shape such as bead width, penetration depth, weld area, aspect ratio and area rate is investigated to assess the effects of welding parameters. As results, the combination of pulse duty/welding speed largely affects on bead width, penetration depth, area and aspect ratio. Finally, it is concluded that the key parameters are the combination of pulse duty/welding speed, base current and arc length, and their optimal conditions are 50%/1.77mm/s, 6.4A and 1 mm.