Category: pipes

Material selection for chemical pipelines

There are many factors affecting the choice of pipeline materials: process design conditions, material properties, economy, processability, contamination of the final product, process safety, corrosion resistance, etc. Cast iron pipe: Ordinary cast iron pipe: It is mainly used for water pipe, gas main pipe, sewage pipe, etc. buried in the ground, which has good corrosion resistance […]

The overall market trend of stainless steel seamless pipes

First. China’s stainless steel seamless pipe production and consumption trends With the development of China’s economy and the acceleration of industrialization, oil, petrochemical, boiler, nuclear power, military, shipbuilding, fertilizer and other enterprises that have long relied on imported stainless steel pipes have turned their attention to stainless steel pipe products produced by Chinese enterprises. Development and construction […]

Development and application of duplex stainless steel

Duplex stainless steel has two kinds of metal phase structure, so the duplex stainless steel can combine the properties of ferritic stainless steel and austenitic stainless steel by properly controlling the chemical composition and heat treatment process, that is, the good toughness and welding of austenitic stainless steel. Performance combined with higher strength and chloride stress […]

Technical research on intergranular corrosion performance of TP321 stainless steel seamless pipe

Intergranular corrosion of stainless steel is a phenomenon of corrosion damage, which is manifested by the loss of bonding force between grains, so that the strength of the material deteriorates. There are many different theories for the cause of intergranular corrosion, such as chromium-depleted theory, grain boundary adsorption theory, precipitation phase metastable theory, metastable phase […]

Matters needing attention in welding of stainless steel water pipes for water supply

When welding the stainless steel pipe, the grinding wheel used only for grinding stainless steel pipes; the steel wire brushes used and the tools to remove the slag are made of stainless steel; the stainless steel pipe surface is not allowed to be exposed to the flame processing place, otherwise the corrosion resistance of the stainless […]

Content and application of various elements added to stainless steel industrial welded pipe

The metal content of different materials in stainless steel welded pipes are different, and the application is very different. The 316 and 317 stainless steel welded industrial tubes contain molybdenum (Mo), which is superior to the 304 stainless steel industrial welded pipe in the marine and chemical industry environments. Among them, 316 stainless steel extends from low […]

The method of identifying the poor quality stainless steel pipe

The stainless steel pipe in the passivated state still has a certain reaction ability because its passivation film is always in a state of dynamic equilibrium of dissolution and repair and repassivation. When the stainless steel pipe is in an environmental medium containing active anions, the equilibrium state is easily destroyed, and the dissolved state at this […]

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