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Effect of Bending Stress on Stress Corrosion Property of LDX2101 Duplex Stainl……

Abstract: The microstructure,corrosion resistance and corrosion morphology of the cold-rolled LDX2101 stainless steel with varying degrees of deformation were characterized by means of optical microscope, and potentiodynamic polarization, and electrochemical impedance spectroscopy. The result showed that: with the increase of stress, the stability of the passivation film on the steel surface was reduced, thus its corrosion resistance decreased obviously. The increasing of stress may also cause the change of corrosion morphology, and thus selective corrosion could clearly observed. As the increase of stress, the pitting preferentially occurred on α/γ phase boundary or inclusions, and then extended to ferrite phase, and thereby the […]

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Knowledge of a filter and a gate valve

A gate valve is one of the most common types of valves in isolation valves. A gate valve can be found in every refinery, chemical plant, power station and industrial enterprise production facility, and its sizes range from DN6 to 4200. The main purpose of selecting the gate valve is to cut off the fluid. It is for this reason that gate valves are often referred to as “cutoff” valves or “block” valves. Gate valves are generally used in fully open or fully closed operation. When a gate valve is fully opened, the pressure drop through the gate valve is very small; when a gate valve is fully […]

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Where to buy high quality Carbon Steel Flanges

What are Carbon Steel Flanges? Carbon steel flanges, the main materials are carbon steels. Carbon Steel Flanges are designed with care using current techniques under the visionary guidance of accomplished professionals at manufacturing unit. Offered range is stringently tested on various parameters of quality for ensuring flawlessness and defect free. These products are widely used in various industries and widely appreciated by clients for owning unmatchable characteristics. Offered range supplied in quality assured packaging material. Carbon steel   • ASTM A105/A266 Gr.2 (high temperature carbon steel flanges)   • ASTM A350 LF1 to LF3 (low temperature carbon steel flanges)   • ASTM A694 […]

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Where to buy high quality stainless steel flange

What is a stainless steel flange? A stainless steel flange is a method of connecting pipes, valves, pumps and other equipment to form a piping system. It also provides easy access for cleaning, inspection or modification. stainless steel flanges are usually welded or screwed. stainless steel flanged joints are made by bolting together two stainless steel flanges with a gasket between them to provide a seal. What is stainless steel? This crystal structure makes such steels non-magnetic and less brittle at low temperatures. For higher hardness and strength, carbon is added. When subjected to adequate heat treatment these steels are used as […]

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Corrosion Fatigue Crack Propagation Behavior of 2205 Duplex Stainless Steel in……

Abstract: Experiments of fatigue crack propagation were performed of 2205 duplex stainless steel (2205 DSS) in the deionized water, 3.5%(mass fraction) NaCl solution and atmosphere respectively. It found that in the aqueous solutions the crack growth rate and the fatigue life of the steel was greatly enhanced and reduced respectively. Correspondingly, the influencing degree of the three media can be described respectively as the following two rankings: (da/dN)deionized water>(da/dN)NaCl>(da/dN)atmosphere for fatigue crack propagation rate and Natmosphere>NNaCl>Ndeionized water for fatigue crack propagation life. The fracture morphology revealed that hydrogen induced cracking is the main reason for the deterioration of the fatigue performance of the […]

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Steel pipe

What is a steel pipe? A steel pipe is a round steel with a hollow section whose length is much larger than the diameter or circumference. It is divided into round, square, rectangular and special-shaped steel pipes according to the cross-sectional shape; it is divided into carbon steel pipe, stainless steel pipe, alloy steel pipe and composite steel pipe according to the material; it is divided into conveying pipe and engineering structure according to its purpose. For thermal equipment, petrochemical industry, machinery manufacturing, geological drilling, steel pipe for high pressure equipment, etc. According to the production process is divided into seamless steel pipe and welded steel pipe, which seamless […]

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Pipe fittings

What are pipe fittings? Pipe fittings are collectively referred to as components that play the role of connecting, controlling, redirecting, diverting, sealing, supporting, etc. in a piping system. According to the different processing techniques, there are four major categories, namely butt-welding pipe fittings (having two kinds of welds and no welds), socket welding and screw fittings. Classification of fittings There are many types of pipe fittings, which are classified according to their use, connection, materials, and processing methods. By usage 1. Fittings for connecting pipes to each other: flanges, unions, pipe clamps, clamps, ferrules, hose clamps, etc. 2, Change the direction of the […]

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Where to get high quality welded steel pipe

What is a welded steel pipe? Welded steel pipe is one pipe the surface has the steel pipe joint,which is use the steel belt or steel plate material through the bending deformation into round ,square ect then welded into shape.  Welded steel pipes products are widely used in boilers, automobiles, ship building lightweight structural steel of the doors and windows, furniture, agricultural machinery, scaffolding, wire conduit, top shelves, containers, etc.. which can meet customer requirements, the special specifications welded pipe can be processed according to user requirements. Welded pipes for conveying water, sewage, gas, air, heating, steam and other low-pressure fluid and other […]

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Flange

What is a flange? A flange is a part that connects a pipe to a pipe, and is connected to a pipe end. There are holes in the flange, and bolts make the two flanges tight. The flanges are sealed with a gasket. Flanged pipe fittings are pipe fittings with flanges (flange or socket). It can be cast (not shown), it can also be threaded or welded. A flange joint consists of a pair of flanges, a washer, and bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After the nut is tightened, the […]

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Failure Analysis on Natural Gas Pipeline of 20 Steel and 16Mn Steel

Xuexu XU1, Zhiyong LIU1, Jiankuan LI1, Cuiwei DU1, Hui HUANG2, Renyang HE2 1 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China 2 China Special Equipment Inspection and Research Institute, Beijing 100013, China Abstract: The failure analysis for a natural gas pipeline, composed of pipes of 20 steel and 16Mn steel, was performed by means of examination of macro-morpholopy, metallograph, inclusion analysis as well as scanning electron microscope examination and chemical analysis for the relevant materials. Results showed that the areas with higher Mn-content such as the weld joint and the right-angle elbow, were serious corroded. […]

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