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Material
Published in Subhash Reddy Gaddam, Design of Pressure Vessels, 2020
Inconel and incoloy are used for very high temperature services above 800°C, for noncooled and non-PPs such as coil supports, tube supports in high temperature radiation zones, and furnace components.Inconel: Different grades of inconel contain nickel in the range of 50 to 75% and chromium in the range of 15 to 25% and are suitable for high temperature above 800°C. SB-168 Alloy Nos. 6600, 6601, 6617, and 6690 belong to this group.Incoloy: Different grades of incoloy contain nickel in the range of 30 to 40% and chromium around 20% and are suitable for high temperature above 800°C. SB-409 Alloy No.8120, 8800, 8810, and 8811 belong to this group.
Corrosion
Published in Mavis Sika Okyere, Mitigation of Gas Pipeline Integrity Problems, 2020
Incoloy 825: this alloy will give excellent corrosion resistance to a broad base of severe environments. It has good resistance to stress corrosion cracking, and the high nickel content in conjunction with the copper and molybdenum gives it outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids.
External Corrosion Protection
Published in Mavis Sika Okyere, Corrosion Protection for the Oil and Gas Industry, 2019
Incoloy 825: This alloy will give excellent corrosion resistance in a broad base of severe environments. It has good resistance to stress corrosion cracking, and the high nickel content in conjunction with the copper and molybdenum gives it outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids.
The high temperature corrosion of Incoloy 800H alloy at three different atmospheres
Published in Journal of Nuclear Science and Technology, 2023
Haoxiang Li, Wei Zheng, Bin Du, Huaqiang Yin, Xuedong He, Tao Ma, Xingtuan Yang
Incoloy 800 H (Fe-32Ni-21Cr) alloy is a Ni-Fe-Cr solid solution strengthened nickel-based superalloy with austenite as matrix developed by American Special Metals Corporation (SMC). This alloy has excellent creep fracture resistance, oxidation resistance, and corrosion resistance, and has become one of the main candidate materials for steam generator heat transfer tubes of nuclear power units [6,7]. Previous studies have shown that different impurity contents will lead to different corrosion phenomena of the alloy, and the main corrosion types are oxidation, carburization, and decarburization [8–10]. In the previous work of others, the corrosion of Incoloy 800 H alloy in air, helium, and molten salt environment had been thoroughly studied [11–14]. However, there were few studies on the corrosion of the alloy under the extreme impurity content strictly controlled and monitored at 950°C. In this study, the corrosion phenomenon and mechanism of Incoloy 800 H alloy under three strictly controlled and monitored extreme atmosphere conditions (Vacuum: almost free of any impurities; Air: the most extreme impurity atmosphere that can be reached after the breach of the primary circuit pipeline; impure helium: the most extreme atmosphere that reaches the design limit of HTR-PM under normal working conditions) were mainly explored. It provided a reference for the use of Incoloy 800 H alloy as an alternative material for high-temperature gas cooled reactor in three extreme environments of ultra-high temperature.
Face turning of Incoloy 800 under MQL and nano-MQL environments
Published in Materials and Manufacturing Processes, 2021
K. V. Ramanan, S. Ramesh Babu, M. Jebaraj, K. Nimel Sworna Ross
Face turning experiments were carried out on Kirloskar lathe with a spindle speed range from 35 to 1500 rpm. The cutting conditions were selected based on the previous researchers and cutting tool manufacturer’s recommendation. Two samples were taken for each trail. The work material is Incoloy 800 whose chemical composition was tested by spark emission spectrometer, which is listed in Table 1. Incoloy 800 is an Iron-based Nickel alloy commonly used in Nuclear, Petrochemical industries mainly for its superior strength and excellent corrosion resistance properties. Incoloy 800 of size 50 mm (dia) x 35 mm (length) was utilized for the current investigation. To ensure trueness of the work material during the face turning operation, the surface of the work material was pre-machined on the faces. Incoloy 800 is more difficult to machine when compared to austenitic stainless steels. Work hardening and stickiness are the issues involved while machining this material. The bulk material hardness is 170–175 BHN as tested by 10 mm ball/3000 kg Load. In this study, SANDVIK makes CNMG 12 04 type inserts GC1105 PVD-TiAlN coated grade has been used as per Sandvik recommendations. Accordingly, DCLNR 25 25 12 tool Holder with a top clamp to improve the rigidity was used. A new cutting edge of the carbide insert is employed for each experiment. Figure 1 depicts the experimental setup and measurement.