• 제목/요약/키워드: stainless-steel

검색결과 3,657건 처리시간 0.025초

Review on sodium corrosion evolution of nuclear-grade 316 stainless steel for sodium-cooled fast reactor applications

  • Dai, Yaonan;Zheng, Xiaotao;Ding, Peishan
    • Nuclear Engineering and Technology
    • /
    • 제53권11호
    • /
    • pp.3474-3490
    • /
    • 2021
  • Sodium-cooled fast reactor (SFR) is the preferred technology of the generation-IV fast neutron reactor, and its core body mainly uses nuclear-grade 316 stainless steel. In order to prolong the design life of SFRs to 60 years and more, it is necessary to summarize and analyze the anti-corrosion effect of nuclear grade 316 stainless steel in high temperature sodium environment. The research on sodium corrosion of nuclear grade 316 stainless steel is mainly composed of several important factors, including the microstructure of stainless steel (ferrite layer, degradation layer, etc.), the trace chemical elements of stainless steel (Cr, Ni and Mo, etc) and liquid impurity elements in sodium (O, C and N, etc), carburization and mechanical properties of stainless steel, etc. Through summarizing and constructing the sodium corrosion rate equations of nuclear grade 316 stainless steel, the stainless steel loss of thickness can be predicted. By analyzing the effects of temperature, oxygen content in sodium and velocity of sodium on corrosion rate, the basis for establishing integrity evaluation standard of SFR core components with sodium corrosion is provided.

산소 플라즈마 처리가 스테인레스 스틸 섬유의 표면 및 인장특성에 미치는 영향 (Effect of Oxygen Plasma Treatment on the Surface and Tensile Properties of Stainless Steel Fibers)

  • 권미연;임대영;이승구
    • 한국염색가공학회지
    • /
    • 제34권2호
    • /
    • pp.102-108
    • /
    • 2022
  • The physicochemical properties of stainless steel fibers which were modified by oxygen plasma treatment were analyzed through microscopy and XPS analysis. The wettability of the surface of the stainless steel fiber was observed by measuring water contact angle to find out the effect of the plasma treatment time on the surface characteristics of the stainless steel fiber. In addition, in order to understand the effect of oxygen plasma treatment on the deterioration of the stainless steel fiber properties, the physical properties due to plasma treatment was investigated by measuring the weight reduction, tensile strength, elongation, tensile modulus of the stainless steel fibers according to the treatment time. As a result, the stainless steel fiber surface was etched by the oxygen plasma and the surface became more wettable by the introduction of hydrophilic functional groups. However the physical properties of the stainless steel fiber were not significantly deteriorated even if the surface of the stainless steel fiber made hydrophilic.

스테인레스 스틸 슬래그의 분말도에 따른 모르터의 물성에 관한 기초적 연구 (A Fundamental Study on Properties of Mortar Following the Stainless Steel Slag of Fineness)

  • 이희두;임남기
    • 한국건축시공학회:학술대회논문집
    • /
    • 한국건축시공학회 2002년도 학술논문발표회
    • /
    • pp.69-74
    • /
    • 2002
  • The following results are achieved from a mortar flow test depending on stainless steel slag fineness, replacement ratio, and a research on material age compressive strength, strength activity index. 1. Flow is proportional to the stainless steel slag fineness within the limits of 4000~8000$\textrm{cm}^2$/g, but in the case of fineness 20000$\textrm{cm}^2$/g flow decreases at all conditions except the case of replacement ratio 10%. 2. As stainless steel slag replacement ratio increases, Mortar of flow somewhat decreases. 3. As stainless steel slag blends, compressive strength decreases, but in proportion to the increase of age, compressive strength increases. 4. As stainless steel slag replacement ratio, compressive strength decreases. 5. In the case of stainless steel slag fineness 6000$\textrm{cm}^2$/g and 20.000$\textrm{cm}^2$/g, compressive strength of revelation ratio has the maximum value when it's replacement ratio is 10%.

  • PDF

Ultimate behaviour and rotation capacity of stainless steel end-plate connections

  • Song, Yuchen;Uy, Brian;Li, Dongxu;Wang, Jia
    • Steel and Composite Structures
    • /
    • 제42권4호
    • /
    • pp.569-590
    • /
    • 2022
  • This paper presents a combined experimental and numerical study on stainless steel end-plate connections, with an emphasis placed on their ultimate behaviour and rotation capacity. In the experimental phase, six connection specimens made of austenitic and lean duplex stainless steels are tested under monotonic loads. The tests are specifically designed to examine the close-to-failure behaviour of the connections at large deformations. It is observed that the rotation capacity is closely related to fractures of the stainless steel bolts and end-plates. In the numerical phase, an advanced finite element model suitable for fracture simulation is developed. The incorporated constitutive and fracture models are calibrated based on the material tests of stainless steel bolts and plates. The developed finite element model exhibits a satisfactory accuracy in predicting the close-to-failure behaviour of the tested connections. Finally, the moment resistance and rotation capacity of stainless steel end-plate connections are assessed based on the experimental tests and numerical analyses.

연강-스테인리스강의 확산접합에 관한 연구 (Study on Diffusion Bonding of Stainless Steel to Mild Steel)

  • 김승태
    • 열처리공학회지
    • /
    • 제11권1호
    • /
    • pp.17-26
    • /
    • 1998
  • Cladding of stainless steel on mild steel was prepared by diffusion bonding process. The bond strength increased with an increase of bonding temperature and time. It was also found that the bond strength increased as the surface roughness decreased. After the diffusion bonding of stainless steel-mild steel, the mild steel part near the bonded interface showed higher strength than the base steel due to the migration of chromium and nickel from stainless steel to mild steel. Carbon migration from mild steel gave effect on the formation of chromium carbides at grain boundaries of stainless steel, the fractograpohic features of the imperfectly bonded interface showed rather coarse dimples in the mild steel part and very fine dimples in the stainless steel part.

  • PDF

페라이트계 스테인레스강의 STICKING 발생 및 성장기구 (Nucleation and Growth Mechanism of Sticking Phenomenon in Ferritic Stainless Steel)

  • 진원;최점용
    • 한국소성가공학회:학술대회논문집
    • /
    • 한국소성가공학회 1999년도 제3회 압연심포지엄 논문집 압연기술의 미래개척 (Exploitation of Future Rolling Technologies)
    • /
    • pp.373-382
    • /
    • 1999
  • Nucleation and growth process of sticking particle in ferritic stainless steels was investigated using a two disk type hot rolling simulator. The sticking behavior was strongly dependent on the surface roughness of a high speed steel roll(HSS) and the oxidation resistance of the ferritic stainless steels. A hot rolling condition with the lower oxidation resistance of the stainless steel and the higher surface roughness of HSS roll was more sensitive to sticking occurrence. It was also illucidated that the initial sticking particles were nucleated at the scratches formed on the roll surface and were served as the sticking growth sites. As rolling proceeded, the sticking particles grew sites. As rolling proceeded, the sticking particles grew by the process that the previous sticking particles provided the sticking growth sites.

  • PDF

Investigation of cold-formed stainless steel non-slender circular hollow section columns

  • Ellobody, Ehab;Young, Ben
    • Steel and Composite Structures
    • /
    • 제7권4호
    • /
    • pp.321-337
    • /
    • 2007
  • The investigation on the behaviour of cold-formed stainless steel non-slender circular hollow section columns is presented in this paper. The normal strength austenitic stainless steel type 304 and the high strength duplex materials (austenitic-ferritic approximately equivalent to EN 1.4462 and UNS S31803) were considered in this study. The finite element method has been used to carry out the investigation. The columns were compressed between fixed ends at different column lengths. The geometric and material nonlinearities have been included in the finite element analysis. The column strengths and failure modes were predicted. An extensive parametric study was carried out to study the effects of normal and high strength materials on cold-formed stainless steel non-slender circular hollow section columns. The column strengths predicted from the finite element analysis were compared with the design strengths calculated using the American Specification, Australian/New Zealand Standard and European Code for cold-formed stainless steel structures. The numerical results showed that the design rules specified in the American, Australian/New Zealand and European specifications are generally unconservative for the cold-formed stainless steel non-slender circular hollow section columns of normal and high strength materials, except for the short columns and some of the high strength stainless steel columns. Therefore, different values of the imperfection factor and limiting slenderness in the European Code design rules were proposed for cold-formed stainless steel non-slender circular hollow section columns.

정수기 냉온수 탱크 원통형 드로잉 제품의 재질 변화에 따른 두께 변화에 관한 연구 (A study on the change of thickness according to material change of water purifier cold and hot water tank cylindrical drawing products)

  • 장은정;이춘규
    • Design & Manufacturing
    • /
    • 제15권3호
    • /
    • pp.13-18
    • /
    • 2021
  • In plate forming technology, cylindrical drawing process is widely used in industry due to technological development. In this study, we used stainless steel 3042B and stainless steel 304J1, which are the most commonly used materials in the production of cold and hot water tanks for water purifiers, among cylindrical drawing products. Under the same conditions, the thickness of the sidewall of the product formed by drawn experiment was studied. As a result of the experiment, the bottom thickness of stainless steel 304J1 was considered to be thick. It is judged that the defect rate can be reduced by changing the breaking phenomenon of the floor surface of the cold and hot water bottles to the material of stainless steel 304j1. Stainless steel 304 2B material shows a sharp change in thickness from punch corner R to sidewall position, while stainless steel 304J1 material showed a uniform change from punch corner R to sidewall position. Stainless steel 304J1 material is considered to improve the clamping of the product in the process of extracting the product after hand drawing. The appearance of stainless steel 3042B products is considered to produce more wrinkles in the flange, which exerts greater tensile force on the sidewall during molding, resulting in uneven sidewall thickness.

탄소강-스테인리스강 용접부의 피로균열진전 특성에 관한 연구 (A Study on the Fatigue Crack Growth Characteristics for the Weldment of Carbon steel-Stainless steel)

  • 권재도;김우현;김길수;박중철;배용탁;김중형
    • Journal of Welding and Joining
    • /
    • 제16권4호
    • /
    • pp.47-54
    • /
    • 1998
  • Various equipments in plants are welded with two different materials and it is required to investigate the effects of fatigue crack propagation on the neighborhood of a welded portion. The characteristics of fatigue crack growth in the base metal of carbon and stainless steel, in the carbon and stainless steel sides located in the neighborhood of welded portion (carbon/stainless steel), respectively and welded portion, are investigated. The results show that the crack growth in the welded portion (carbon/stainless steel) is an average value of the crack growths in the carbon and stainless steel respectively located in the neighborhood of the welded portion. It is found that the crack growth in the welded portion is not significantly different from those in the carbon and stainless steel sides. Hence it can be concluded that the structure welded with two different materials wold not impede the integrity based on the fatigue crack growth.

  • PDF

Investigations on the bearing strength of stainless steel bolted plates under in-plane tension

  • Kiymaz, G.
    • Steel and Composite Structures
    • /
    • 제9권2호
    • /
    • pp.173-189
    • /
    • 2009
  • This paper presents a study on the behavior and design of bolted stainless steel plates under in-plane tension. Using an experimentally validated finite element (FE) program strength of stainless steel bolted plates under tension is examined with an emphasis on plate bearing mode of failure. A numerical parametric study was carried out which includes examining the behavior of stainless steel plate models with various proportions, bolt locations and in two different material grades. The models were designed to fail particularly in bolt tear-out and material piling-up modes. In the numerical simulation of the models, non-linear stress-strain material behavior of stainless steel was considered by using expressions which represent the full range of strains up to the ultimate tensile strain. Using the results of the parametric study, the effect of variations in bolt positions, such as end and edge distance and bolt pitch distance on bearing resistance of stainless steel bolted plates under in-plane tension has been investigated. Finally, the results obtained are critically examined using design estimations of the currently available international design guidance.