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Stainless steel seamless pipe Your current location: home page /Stainless steel seamless pipe / summarize the quality problems of stainless steel pipe
The quality problems of stainless steel pipe are summarized
Double click auto scroll Published by: lcqywlzx published on: November 30, 2016 read: two thousand five hundred and ninety-eight Secondary [font: large in Small

yes Stainless steel pipe Material quality problems are summarized

There are super large size compound inclusions in the inner wall of stainless steel tube and nearby. According to the results of spectrum detection, the inclusions are mainly composed of Mg, Al, Si, s, CA, O, Na, and some inclusions also contain a small amount of Zr. The inclusions exist in steel in the form of mixture of calcium aluminate, alumina, silicon oxide, magnesium oxide and iron oxide. Na and k elements in inclusions are the characteristic components of mold flux during continuous casting. Other oxides and compounds come from deoxidation products, tundish covering agent, mold flux and nozzle material, The main reason is that the liquid level of tundish steel is low, which causes the tundish covering agent to be involved in the molten steel or the mold liquid level fluctuates greatly during the pouring process, which results in the mold powder being involved in the molten steel. In the process of continuous casting, these foreign inclusions can't float up completely and remain in the slab, forming extra large size inclusions. In the process of pipe sizing, the rolling force and friction force act on the inner wall of the pipe, and the inclusions are separated from the metal matrix and "wrinkled" due to large axial rolling and extrusion, thus forming a series of convex strip bulges. Strict control of steelmaking and pouring process, selection of appropriate mold powder according to pouring process and equipment conditions, as far as possible to reduce the formation of oversize inclusions in steel, effectively improve the purity of molten steel, is the fundamental way to solve the problem of inner wall bulging of stainless steel pipe.


3.2 unqualified pipes


3.2.1 macroscopic morphology


? ? Some stainless steel pipes give an alarm during ultrasonic inspection, but no obvious defects are observed on the inner and outer surfaces of the pipes. After grinding, the slender defects similar to cracks can be observed in the stainless steel pipes.


3.2.2 microscopic examination


? ? Gradually grind the profile in two directions to find the defect. Large size inclusions were found after several times of polishing and sampling on the pipe wall. The inclusions in the longitudinal section were found by cutting along the longitudinal direction. The inclusions found in the experiment were generally linear or chain like. According to the energy spectrum detection, most of the inclusions were compound inclusions composed of deoxidation products, mold powder and nozzle falling residue.





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