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Optimal design and research on lap joint flange of heat exchanger

The design of titanium lap joint flange (loose flange) is the key and difficult point in the design of seawater heat exchangers for offshore oil platforms. In order to make the design of loose flanges more reasonable, the article takes titanium loose flanges as the research object, and builds physical models based on an example of a platform heat exchanger, and establishes mathematical models based on relevant standards and mechanical knowledge; using EDR, SW6 and FORTRAN Language and other tools are used to optimize the solution, and the final solution results meet the requirements of on-site working conditions, design strength and […]

2020-08-06 read more...
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Nickel-based super alloy: Incoloy 840 (Alloy 840/UNS S33400)

What is Incoloy 840? Nickel-based super alloy Incoloy 840 (Alloy 840/UNS S33400): Incoloy 840 nickel-based alloy: The Cr content in Incoloy 840 nickel-based alloy alloy is usually 18-20%, and the nickel content is 19-21%. Incoloy 840 alloy is a kind of austenitic stainless steel containing titanium and aluminum. It contains enough chromium to form and maintain a sufficient scale of chromium oxide to protect it under high temperature conditions and is more resistant to high temperatures than traditional chromium-nickel stainless steels such as 304; The higher nickel content makes it have better oxidation resistance than the standard 18-8 stainless steel, […]

2020-08-06 read more...
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Nickel-based super alloy: Incoloy 925 (Alloy 925/UNS N08925)

What is Incoloy 925? Designated as UNS N08925, Incoloy 925 (also known as “Alloy 925”) is a precipitation-hardenable iron-nickel-chromium alloy with additions of molybdenum, copper, titanium and aluminum. The alloy has outstanding resistance to general corrosion, pitting, crevice corrosion, and stress-corrosion cracking in many aqueous environments, including those containing sulfides and chlorides. Incoloy 925 is used in various applications requiring a combination of high strength and corrosion resistance such as sour gas wells, oil production equipment, surface & down-hole piping components (flanges, valves, fasteners, fittings, shafts), etc. ASTM B983 UNS N08925 heavy-wall seamless pipe, 16″ w.t=45mm, Incoloy 925. Characteristics of […]

2020-08-04 read more...
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Steel surface treatment: application of new environmental protection blackenin……

What is blackening? Blackening is a common method of chemical surface treatment. The principle is to produce an oxide film on the metal surface to isolate the air and achieve the purpose of rust prevention. Blackening treatment can be used when the appearance requirements are not high. The surface blackening treatment of steel parts is also called bluing. Common method The commonly used methods for blackening treatment are the traditional alkaline heating blackening and the late normal temperature blackening. However, the blackening process at room temperature is not very effective for low carbon steel. Alkaline blackening is subdivided, and there […]

2020-08-03 read more...
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Nickel-based super alloy: Incoloy 330 (UNS N08330/W.Nr. 1.4886)

What is Incoloy 330? Incoloy 330 (UNS N08330) is a nickel-iron-chromium austenitic alloy, specially used in high temperature environment Oxidation and carburization. The nickel content of 34%-37% makes the material highly resistant to chloride stress corrosion cracking and sigma phase precipitation embrittlement. The material is processed through standard processing procedures for stainless steel and nickel alloys. It is widely used for anti-corrosion in the environment of combined heating and carburizing. Designated as UNS N08330 or DIN W.Nr. 1.4886, Incoloy 330 (also known as “Alloy 330”) is an iron-nickel-chromium alloy with deliberately controlled addition of silicon to improve its oxidation resistance. It […]

2020-08-02 read more...
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Nickel-based super alloy: Incoloy 20 (UNS N08020/DIN 2.4660)

What is Incoloy 20? Alloy 20, UNS N08020, is also known as Incoloy 020, Incoloy 20, 20Cb-3, CN7M(castings), or DIN 2.4660. It is a nickel-iron-chromium alloy with additions of copper and molybdenum. It has exceptional corrosion resistance to sulfuric acid, choloride stress-corrosion cracking, nitric acid, and phosphoric acid. Alloy 20 can be readily hot-formed or cold-formed to valves, pipe fittings, flanges, fasteners, pumps, tanks, as well as heat exchanger components. The hot forming temperature should be in the range of 1400-2150°F [760-1175°C]. Usually, the heat treatment of annealing should be conducted at the temperature range of 1800-1850°F [982-1010°C]. Alloy 20 is […]

2020-08-01 read more...
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Research on Machining Technology and Method of Thin-Wall Sleeve

Thin-walled sleeves have always been difficult to form in machining. This is mainly because they are prone to deformation during machining, and the size and shape tolerances are difficult to meet the requirements. However, the thin-walled sleeve is a necessary structural part of various machines, which requires the machining technology to overcome the thin-walled sleeve. This article is to solve the problem of thin-walled sleeve machining and analyze its technology and methods. Factors affecting the quality of thin-walled sleeves Modern processing technology is constantly advancing, and thin-walled sleeve processing technology has become increasingly mature, and it has now become one […]

2020-07-31 read more...
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Nickel-based super alloy: Incoloy 825 (UNS N08825/W.Nr. 2.4858)

What is Incoloy 800H? Designated as UNS N08825 or DIN W.Nr. 2.4858, Incoloy 825 (also known as “Alloy 825”) is an iron-nickel-chromium alloy with additions of molybdenum, cooper and titanium. The molybdenum addition improves its resistance to pitting corrosion in aqueous corrosion application while copper content bestows resistance to sulfuric acid. Titanium is added for stabilization. The Alloy 825 has excellent resistance to both reducing and oxidizing acids, to stress-corrosion cracking, and to localized attack such as pitting and crevice corrosion. It is especially resistant to sulfuric and phosphoric acids. Incoloy 825 alloy is mainly used for chemical processing, petrochemical piping, pollution-control […]

2020-07-31 read more...
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Nickel-based super alloy: Incoloy 800HT (UNS N08811/W.Nr. 1.4959)

What is Incoloy 800H? Incoloy 800HT, also known as “Alloy 800HT”, is designated as UNS N08811 or DIN W.Nr. 1.4959. It is an iron-nickel-chromium alloy having the same basic composition as Incoloy 800 and Incoloy 800H but with significantly higher creep-rupture strength. The higher strength results from deliberate control of the carbon, aluminum, and titanium contents in conjunction with a high-temperature anneal. Used in chemical and petroleum processing, in power plants for superheater and reheater tubing, in industrial furnaces, and for heat treating equipment. Incoloy800HT (N08811) is a kind of All-Austrian in the same series as Incoloy 800 a low-carbon nickel-iron-chromium alloy whose cobalt content can be […]

2020-07-31 read more...
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Nickel-based super alloy: Incoloy 800H (UNS N08810/W.Nr. 1.4958)

What is Incoloy 800H? Incoloy 800H, also known as “Alloy 800H”, is designated as UNS N08810 or DIN W.Nr. 1.4958. It has almost the same chemical composition as Alloy 800 except that it requires a higher carbon addition resulting in improved high-temperature properties. Compared to Incoloy 800, it has better creep and stress-rupture characteristics in the 1100°F [592°C] to 1800°F [980°C] temperature range. While Incoloy 800 is usually annealed at at approximately 1800°F [980°C], Incoloy 800H should be annealed at approximately 2100°F [1150°C]. Besides, Alloy 800H has a coarser average grain size in accordance with ASTM 5. Incoloy 800H (NO8810) nickel-based alloy alloys usually […]

2020-07-31 read more...
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