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ステンレス鋼と亜鉛メッキ鋼

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Introduction Stainless Steel vs Galvanized Steel, it’s crucial to consider the environment, required durability, and maintenance needs. Stainless steel offers unmatched corrosion resistance, strength, and visual appeal, making it suitable for demanding applications in harsh environments. Galvanized steel, on the other hand, offers cost-effective corrosion protection for less aggressive settings. 1. Composition and Manufacturing Process Stainless Steel Stainless steel is an alloy composed mainly of iron, chromium (at least 10.5%), and sometimes nickel and molybdenum. Chromium forms a protective oxide layer on the surface, giving it excellent corrosion resistance. Different grades, like 304 and 316, vary in alloying elements, providing options for various environments, including extreme temperatures and high salinity. […]

異なる等温温度における P92 鋼の微細構造の進化

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Microstructure Evolution of P92 Steel at Different Isothermal Temperatures P92 steel is mainly used in ultra-supercritical boilers, ultra-high-pressure pipelines, and other high-temperature and high-pressure equipment.P92 steel is in the P91 steel chemical composition based on the addition of trace elements of W and B elements, reduces the content of Mo, through the grain boundaries of the strengthened and dispersion strengthened in a variety of ways, to improve the comprehensive performance of the P92 steel, P92 steel than the P91 steel has better resistance to oxidation performance and corrosion resistance. A hot working process is essential for producing the P92 steel pipe. Thermal processing technology can eliminate the internal defects generated […]

ASME B31.1 と ASME B31.3: 配管設計規格を知る

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Introduction In piping design and engineering, selecting the appropriate piping code is essential for ensuring safety, efficiency, and compliance with industry standards. Two of the most widely recognized piping design codes are ASME B31.1 and ASME B31.3. While they both come from the American Society of Mechanical Engineers (ASME) and govern the design and construction of piping systems, their applications differ significantly. Understanding the ASME B31.1 vs. ASME B31.3 debate is crucial for selecting the correct code for your project, whether it involves power plants, chemical processing, or industrial facilities. Overview: ASME B31.1 vs. ASME B31.3 What is ASME B31.3 or Process Piping Code? ASME B31.1 is the standard that […]

ASME BPVC セクション II パート A: 鉄鋼材料仕様

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Introduction ASME BPVC Section II Part A: Ferrous Material Specifications is a section of the ASME Boiler and Pressure Vessel Code (BPVC) that covers specifications for ferrous materials (primarily iron) used in the construction of boilers, pressure vessels and other pressure-retaining equipment. This section specifically addresses the requirements for steel and iron materials, including carbon steel, alloy steel, and stainless steel. Related Material Specifications for Tubes & Plates Tubes: SA-178/SA-178M – Electric-Resistance-Welded Carbon Steel and Carbon-Manganese Steel Boiler and Superheater Tubes SA-179/SA-179M – Seamless Cold-Drawn Low-Carbon Steel Heat-Exchanger and Condenser Tubes SA-192/SA-192M – Seamless Carbon Steel Boiler Tubes for High-Pressure Service SA-209/SA-209M – Seamless Carbon-Molybdenum Alloy-Steel Boiler and Superheater Tubes […]

焼入れSAE4140シームレス鋼管のリング状亀裂の原因分析

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The reason for the ring-shaped crack at the pipe end of the SAE 4140 seamless steel pipe was studied by chemical composition exam, hardness test, metallographic observation, scanning electron microscope, and energy spectrum analysis. The results show that the ring-shaped crack of SAE 4140 seamless steel pipe is a quenching crack, generally occurring at the pipe’s end. The reason for the quenching crack is the different cooling rates between the inside and outside walls, and the outside wall cooling rate is much higher than that of the inside wall, which results in cracking failure caused by stress concentration near the inside wall position. The ring -shape crack can be eliminated by […]

ASME SA213 T91: どれくらい知っていますか?

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Background & Introduction ASME SA213 T91, the steel number in the ASME SA213/SA213M standard, belongs to the improved 9Cr-1Mo steel, which was developed from the 1970s to the 1980s by the U.S. Rubber Ridge National Laboratory and the Metallurgical Materials Laboratory of the U.S. Combustion Engineering Corporation in cooperation. Developed based on the earlier 9Cr-1Mo steel, used in nuclear power (can also be used in other areas) high-temperature pressurized parts materials, is the third generation of hot-strength steel products; its main feature is to reduce the carbon content, in the limitation of the upper and lower limits of the carbon content, and more stringent control of the content of residual […]