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Three questions about aging deformation

What is aging deformation? Aging deformation is the general term of deformation (dimensional change and deformation) of steel parts placed at room temperature, which is also called long-term aging change. Deformation is not allowed in such precision measuring tools as micrometers and micrometers. The manifestation of aging deformation of quenched parts is initial expansion and then contraction. And this expansion The change of shrinkage is significantly different with the carbon content of steel. Types of aging deformation Deformation aging can be divided into low-temperature Deformation Aging and high-temperature deformation aging. (1) Low temperature deformation aging. After quenching, the material is […]

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Elbow manufacturing by hot push method

The hot push method of manufacturing elbows was developed by Hamburger Bohling GmbH around the sixties according to foreign information. Yaang product specifications range from 21.7mm to 2033mm in steel, stainless steel, non-ferrous metals, and special alloys. Varieties include elbows, pipes, reducer, tee, cross, caps, flanges, sockets, etc. The manufacturing process of the elbow made of steel pipe by the hot push method is as follows. Steel pipe → Cutting off → Raw pipe treatment → Bending → Shaping → Sandblasting → Pipe end processing → Bevel processing → Inspection → Marking → Painting → Drying → Shipping The hot […]

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Study on forming technology of hot push bend

The forming principle and characteristics of hot push bend are briefly described. The process, parameter selection, process control and detection of hot push bend are briefly described. The principle and characteristics of the hot push bend process Hot pushing is the use of steel pipe heated to reduce the strength, plasticity increases the characteristics of the bending power is greatly reduced after the steel pipe bending system. Hot push pipe bend selected equipment for the pushing machine, its structure is divided into four parts: heating and cooling device, mainly induction loop and cooling water system; transmission structure, consisting of electric […]

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What is P91 steel

What is P91 steel? P91 steel is a 9% Cr-1% Mo low-carbon martensitic steel micro-alloyed with vanadium and niobium elements and controlled nitrogen content, which has excellent high-temperature strength and creep properties in the temperature range of 560℃~610℃, as well as good corrosion resistance, oxidation resistance and high-pressure hydrogen resistance, and is widely used in the superheater and reheater pipes in power plant boilers, and distillation, cracking units and refineries in the construction of high-temperature, high-pressure, hydrogen-proof equipment. P91 steel is equivalent to the national standard 10Cr9Mo1VNbN, which not only has high oxidation resistance and high temperature steam corrosion resistance, […]

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Brief analysis of forming and heat treatment process of P91 tee

With the massive application of P91 steel in domestic thermal power generating units, the demand for P91 pipe fittings (elbows, tees, reducers, etc.) used for pipeline connections is also increasing day by day, due to the special characteristics of P91 material, P91 pipe fittings (especially tees) forming and heat treatment process has been plagued by many pipe manufacturing enterprises. This paper discusses and summarizes the forming and heat treatment of P91 tee from the performance of P91 material, combined with the manufacturing practice of P91 tee of this enterprise for many years. 1. Properties and uses of P91 material P91 material […]

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Quality control methods and specific measures for industrial pipeline installa……

How to control the quality of industrial pipeline installation? Industrial pipeline installation has a strong technical nature, the construction process needs to be carried out in strict accordance with the construction specifications and construction procedures, this paper combines many years of experience in pipeline construction, summarizing the industry pipeline installation quality control methods and specific measures. With the accelerated pace of industrialization and urbanization construction, a new city, factories, mines and enterprises will rise suddenly, and with it, the industrial pipeline installation project has increased. Industrial pipeline installation project quality control requirements are high, often affected by a variety of […]

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Application of stainless steel pipe in petroleum and petrochemical industry

Stainless steel in the petroleum and petrochemical applications Stainless steel according to the chemical composition can be divided into Cr stainless steel, Cr-Ni stainless steel, Cr-Ni-Mo stainless steel, according to the application area can be divided into medical stainless steel, atmospheric corrosion resistant stainless steel, oxidation resistant stainless steel, Cl- corrosion resistant stainless steel, etc.. But the most commonly used classification is according to the steel organization, generally can be divided into ferritic stainless steel, austenitic stainless steel, martensitic stainless steel, duplex stainless steel and precipitation hardening stainless steel. In the petroleum and petrochemical applications mainly austenitic stainless steel, ferritic […]

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Provisions for arrangement of pipe fittings and pipe accessories

Function of piping system 1. piping system: abbreviated as pipe line, composed of pipe, pipe fitting and valve. 2. function of piping system: used in chemical plants to connect various devices and convey fluids into and out of equipment to carry out physical and chemical reactions. 3. piping: the construction of piping. Pipes Classification of pipes Pipes can be divided into three kinds of pipes, such as pipe, tube and hose, as 1.5.1 shown in the table. Table 1.5.1 Classification of pipes Classification Type Special Features pipe Steel pipe, stainless steel pipe, cast iron pipe Larger pipe diameter and thicker […]

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Folding defect detection method and device of seamless steel pipe

For the folding defects in the steel pipe, many flaw detection methods lack the ability to detect. In the water coupler, multi-channel high-energy focusing probe and impact function excitation circuit, pulse width linear amplification circuit in the detection device, using “time division multiplexing, high-speed sampling” technology and intelligent computer programs and other technologies, not only can detect folding defects, but also detect the wall thickness of the steel pipe. The detection speed of 15m / min, detection accuracy ± 0.1mm. experiments and long-term application to prove that this detection technology is reliable. Many non-destructive testing methods and equipment for the […]

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Study on precision forming process of stainless steel pipe end of braking system

Among the existing connection methods of railroad wagon braking system pipe system, flange connection is a widely used scheme at present [1], and is also the direction of this improvement. The flange connection consists of flange body, joint body and seal ring, where the flange body is further divided into integral flange and split flange. The joint body in the flange connection structure is machined, which wastes materials and energy, and its tube system and joint body are connected by welding, which generates harmful gases during the welding process and causes pollution to the environment, and the strength of the […]

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