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Cause Analysis and Countermeasure of Flange Seal Leakage

Leakage is a common phenomenon in chemical production, and it is also a problem that must be solved in safety production of chemical industry. Once all kinds of chemical pipelines and equipment leak, they will be wasted, and the whole plant will be shut down. Some leaks will do harm to people and the surrounding environment. Therefore, people do everything possible to prevent leakage in production practice. In chemical pipeline transportation process, flange connection and sealing are necessary, and the quantity is large and wide. Reasonable selection of flange sealing form and gasket material can effectively prevent leakage, and make […]

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Brief Introduction of Solution Treatment Heat Treatment Process for 304 Stainl……

Austenitic stainless steel is a kind of stainless steel with austenitic structure at room temperature. Steady austenite structure occurs in steels containing about 18% Cr, 8%-10% Ni and 0.1% C. Austenitic stainless steel is nonmagnetic and has high toughness and plasticity, but its strength is low. It is impossible to strengthen austenitic stainless steel by phase transformation. It can only be strengthened by cold working. If S, Ca, Se and other elements are added, it has good machinability. In addition to oxidation resistance and acid medium corrosion, such steels can also resist sulfuric acid, phosphoric acid, formic acid and acetic […]

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Heat treatment process and properties of S30432 austenitic stainless steel bend

A new austenite S30432 stainless steel pipe bend was prepared, and the effect of heat treatment technology on properties of S30432 pipe bend was investigated. The results show that the 1150℃ solution strengthening lead to the grain size nouniform and large austenite grain occurring. Solution process at 1110℃ or 1060℃, the uniform and fine austenite grain was obtained, with a austenite grain size 8~9 grade even if at the largest deformation zone, which still keep the same grain size in comparison with the original direct tube. While, the tensile strength at the zone is higher than that of direct raw […]

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Automobile fastener variety optimization and material and heat treatment

According to statistics, there are currently about 240 commonly used standards for automotive standard parts, including tube sealing components, pipe line connecting fixtures, washers, screws, nuts and bolts, etc., of which 115 standards and metal fastening Related, accounting for about 48%. With the continuous development of the automotive industry, the automakers have increased the cost of production and management to curb the increasing number of metal fasteners (hereinafter referred to as automotive fasteners), from structural elements, materials, heat treatment and surface treatment. In terms of the benchmarking of fasteners, this paper discusses this. Auto Fastener Variety Optimization Materials and Heat […]

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What’s the difference between 304, 304H and 304L?

Actually, according to the content of chromium and nickel, 304 stainless steel is made up of 18% chromium (Cr) and 8% nickel (Ni), but the main difference is the carbon content. Chemicals (%) of 304, 304L and 304H Grade C Mn Si P S Cr Mo Ni N 304 min. max. – 0.08 – 2.0 – 0.75 – 0.045 – 0.030 18.0 20.0 – 8.0 10.5 – 0.10 304L min. max. – 0.030 – 2.0 – 0.75 – 0.045 – 0.030 18.0 20.0 – 8.0 12.0 – 0.10 304H min. max. 0.04 0.10 – 2.0 – 0.75 -0.045 – 0.030 […]

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China International Stainless Steel Industry EXPO 2019, Shanghai

China International Stainless Steel Industry Exhibition 2019, Shanghai Date: 10/30/2019 – 11/1/2019 City: Shanghai, China Venue: Shanghai New International Expo Centre(SNIEC), Shanghai, China Organizers: Shanghai Shenshi Exhibition Service Co., Ltd China International Stainless Steel Industry Exhibition will cover steel metallurgy, stainless steel pipes, stainless steel flanges, stainless steel pipe fittings, metal materials, stainless steel enterprises, etc. With the continuous improvement of residents’ living standards, the potential of ultra-large-scale domestic demand is continuously released, and the development of infrastructure construction and high-end equipment manufacturing brings new opportunities for the stainless steel industry to expand the market. Concurrent Expo: Shanghai Metallurgy Expo 2019 – 21st Shanghai Metallurgy […]

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What is a safety valve?

What is a safety valve? Safety valve is a special branch of valve family. Its particularity is that safety valve only plays the role of switch unlike other valves. More importantly, it plays a role in protecting the safety of equipment. Safety valve is in normal closed state under the action of external force. When the medium pressure in the equipment or pipeline rises above the prescribed value, it is a special valve that prevents the medium pressure in the pipeline or equipment from exceeding the prescribed value by discharging the medium outside the system. Safety valves belong to automatic […]

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Six Solutions for Flange Corrosion

The integrity of flange connection is very important for the pipeline system of conveying fluid. Whether it is the pipeline system for transporting chemical media (such as hydrocarbons) or the water supply pipeline, the leakage of flange connection will cause serious environmental and economic impact, and even may bring huge potential safety hazards. If flanges are exposed to corrosive environment or polluted industrial atmosphere without protective measures, the corrosion rate will be very fast. In addition, because of the complex geometry of flange connection, it is easy to cause gap corrosion between two flange surfaces and galvanic corrosion between different […]

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Flange pressure rating

What Is The Nominal Pressure Pn What Is Work Pressure What Is Design Pressure Test Pressure Relationship Flange Pressure Rating 1. What is the nominal pressure PN (MPa)? Reference values related to the pressure resistance of pipeline system components refer to the design pressures related to the mechanical strength of pipeline components. Nominal pressure is generally expressed in PN. (1) Nominal pressure – the compressive strength of the product at the base temperature, expressed in PN, in MPA. (2) Reference temperature: The reference temperature varies with different materials. For example, the reference temperature of steel is 250 degree C. (3) […]

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What is a diaphragm valve?

What is a diaphragm valve? A diaphragm valve is different in structure from the general valves. It is a new type of valve and a special type of shut-off valve widely used in various fields. Its opening and closing member is a diaphragm made of soft material. The inner cavity of the cover and the driving member are separated. Commonly used diaphragm valves are rubber-lined diaphragm valves, fluorine-lined diaphragm valves, unlined diaphragm valves, and plastic diaphragm valves. The diaphragm valve is provided with a flexible diaphragm or a combined diaphragm in the valve body and the valve cover, and the […]

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