When is the best time for post-weld flaw detection of alloy pipes, and how long will it take to finish the heat treatment at most?

Wuxi Duorunde Steel Pipe Co., Ltd. (my answer); ? Low alloy precision pipe is a kind of steel pipe made by cold drawing process, which has good mechanical properties and corrosion resistance and is widely used in petrochemical industry, energy and other fields. Cold-drawn pipe is a kind of steel pipe formed by cold-working hot-rolled or hot-extruded steel pipe, and its dimensional accuracy and surface quality are better than those of hot-rolled steel pipe. There are some differences in chemical composition between low-alloy precision tubes and cold-drawn tubes. Let's briefly analyze them.

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1. carbon element (c)

Carbon is one of the main elements in steel, which has an important influence on the mechanical properties and weldability of steel. Both low-alloy precision tubes and cold-drawn tubes contain a certain amount of carbon, but the carbon content is different. Generally speaking, the carbon content of cold-drawn tubes is high, about 0. 15%-0.20%, while the carbon content of low-alloy precision tubes is low, about 0.05%-0. 10%.

2. Silicon element

Silicon is one of the beneficial elements in steel, which can improve the strength and hardness of steel. Low-alloy precision tubes usually contain a certain amount of silicon, while the silicon content in cold-drawn tubes is low.

3. Manganese element

Manganese is one of the important elements in steel, which can improve the strength, hardness and wear resistance of steel. Both low-alloy precision tubes and cold-drawn tubes contain a certain amount of manganese, but the content is different. Generally speaking, the manganese content of cold-drawn tubes is high, about 0.30%-0.50%, while the manganese content of low-alloy precision tubes is low, about 0.20%-0.30%.

4. Phosphorus and sulfur

Phosphorus and sulfur are one of the harmful elements in steel, which will reduce the plasticity and toughness of steel. Strictly control the contents of phosphorus and sulfur in low alloy precision tubes and cold-drawn tubes to keep them at a low level.

5. Alloy elements

Both low-alloy precision tubes and cold-drawn tubes contain a certain amount of alloying elements, such as chromium (Cr), nickel (Ni) and molybdenum (Mo). These alloying elements can improve the strength, hardness and corrosion resistance of steel. The types and contents of alloying elements in different low-alloy precision tubes and cold-drawn tubes are different, which need to be analyzed according to specific materials and uses.

In a word, there are some differences in chemical composition between low-alloy precision tubes and cold-drawn tubes, which have an important influence on their mechanical properties and corrosion resistance. When purchasing and using these pipes, it is necessary to comprehensively consider the specific materials, uses and use environment.