China Steel Technical Report No.33 .. Development of the 550MPa Grade Hot-dipped Galvanized .. Energy Saving Technology for Lowering Air Leakage .. Seam Defects in Bar Rolling with Consideration .. Prevention of Ferrite Decarburization of Spring Steel .. Characterization and Application of Chromium-free ..
Historically, heating steel for forming, forging or rolling, was done in electrical resistance or natural gas heated furnaces. It was inevitable that these furnaces contained Oxygen and Decarburization of the steel surface occurred. This decarburization was either ignored or minimized by coating the steel with Decarburization - an overview ScienceDirect TopicsDecarburization is a loss of carbon in the surface-adjacent zone of the material (Gunnarson, 1963). Contributing factors are high temperatures and large amounts of oxygen in the atmosphere. At higher temperatures, the diffusion rate of carbon is so large that longer annealing times lead to decarburization. Here, the carbon atoms migrate from the outer layer to the surface and oxidize there to CO or CO2,
through its CLU technology [9,10]. To the knowledge of the present authors, no systematic investigation has been carried out with respect to the simultaneous decarburization and Cr-loss in Fe-Cr-C melts with introduction of CO. 2. In the present study, the Cr retention during M-LCFeCr making process and high alloy steel making process Deep decarburization of steel - PDF Free DownloadDeep Decarburization of Steel M. A. Makarov, A. A. Aleksandrov, and V. Ya. Dashevskii Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, Moscow, 119991 Russia e-mail:[email protected] Received April 17, 2006. AbstractThe process of deep decarburization of steel during argon or hydrogen
Investigation of Decarbuization in Spring Steel Production Process-Part I:Experiments. Dejun, L., Anghelina, D., Burzic, D., Zamberger, J., Kienreich, R., Schifferl, H., Krieger, W. & Kozeschnik, E., 2009, in :Steel research international. 4, S. 298-303. Effect of Decarburization on the Residual Stresses May 26, 2016 · The shot peening is used in the leaf springs manufacturing process for producing a compressive residual stress field (CRSF) at and near the surface that improves the fatigue resistance. The resulting CRSF is influenced by the surface ferrite thickness associated with the decarburization. Hence, this work aims to extend the knowledge on the influence of the decarburization on the CRSF
percentcarbonsteel,normalizedat795°C,annealedat765°C.;e,0.72percentcarbonsteel,nor- malized at795° C, annealed at765° C, quenched in oil from 775° C; /, 0.72 per cent carbon steel, normalized at795° C, annealed at765° C, quenched in oil from 775° C, tempered at450° C. Effects of Temperature and Oxygen Concentration on the Effects of temperature and oxygen concentration on decarburization of 55SiCr spring steel were investigated at the temperature range of 500°C1200°C by using a Muffle furnace (an atmosphere of ambient air) and a Simultaneous Thermal Analyzer (low oxygen concentration with 2% O 2 and 98% N 2).
Jan 25, 2012 · The ferrite decarburization behavior of 60Si2MnA spring steel wires for automotive suspensions, including the forming condition and the influence of heating time and cooling rate after hot rolling, was investigated comprehensively. Forming condition and control strategy of ferrite Jan 25, 2012 · The ferrite decarburization behavior of 60Si2MnA spring steel wires for automotive suspensions, including the forming condition and the influence of heating time and cooling rate after hot rolling, was investigated comprehensively. Also, a control strategy during the reheating process and cooling process after rolling was put forward to protect against ferrite decarburization. The results
Mar 29, 2019 · At present, the most effective measure is to add alloying elements. In general, Sb and Sn are added to inhibit quenching and decarbonization. Two spring steel rods with the same chemical composition, one with Sb and Sn added, the other without Sb and Sn added. The surface C concentration and decarburization depth of sbsn-free steel are about 0 How to prevent decarburization of steel pipes? - SHINESTAR Once decarburization occurs in the production process of the steel pipe, it will affect the subsequent process and reduce the high-quality performance and service life of the steel pipe itself. Therefore, manufacturers usually take appropriate measures to avoid or solve this problem. In general, there are two ways to avoid decarburization.
Sep 01, 2016 · 1. Examination of spring steel microstructure revealed sufficiently high quality of material. The index of non-metallic inclusions was determined to be i = 0.5 (the lowest index for globular oxides) according standard ISO 4967. Decarburization of the surface was found in one specimen among six ones and did not exceed the permissible limits. 2. Protective Bauxite-Based Coatings and Their Anti Jul 20, 2012 · Decarburization of spring steels often occurs during the heat-treatment procedures, such as reheating of base material, hot rolling, and annealing (Ref 1-5), in which, the resulting loss of carbon elements degrades the mechanical properties, by way of reduction of tensile strength, worsening of ductility, and development of cracks, etc. Taking the Si-Mn-added spring steel as an example, it is
Surface decarburization of spring steel 60Si2MnA heated under AC1 temperature and in temperature range of AC3-G was investigated. The results show that under the AC1 temperature, pearlite spheroidization and surface decarburization were carried out simultaneously and had a mutual promotion relationship. In the temperature range of AC3-G, decarburized layer consisted of complete Surface decarburization characteristics and relation The characteristics of complete and partial decarburizations in spring steel 60Si2MnA were systematically investigated, including the microstructure, the hardness gradient, and the formation mechanism. The relation between decarburized types and heating temperature of the steel was comprehensively discussed. It is found that heating temperature has an important influence on the
Decarburization on surface layers can affect heat treatment and hardness attained on parts. Decarburization also provides evidence of where in a process a defect or imperfection occurred. Most defects in steel workpieces encountered in our precision machine shops are longitudinal in nature.Investigation of fracture of carbon steel springs used for [5, 18]. Precise examination of microstructure of steel wire requires other investigation techniques such as X-ray analysis or micro-indentation [5, 19]. For examination of decarburization all transverse samples were observed. According standard EN 10270-1 , permissible depth of decarburization