Internal defect control of small diameter high pressure boiler tube

　　Boiler tubes

　　Defect localization and analysis, mainly for the defect depth 0.2 ~ 0.5mm, the length of 20 ~ 50mm superficial cracks, which causes the piercing of minute defects generated in the process, or rolling the first and second plurality of specifications by trauma, Four planes during rolling 20g high-pressure boiler tube by the inner surface of the oxide residue effects formed in the slide and scarring defects, these defects after rolling reduction of squash and stretch Zhang aggravated.

　　Through the high-pressure boiler tube double length number tracking found that injury concentrated in the steel tube end report first, twice-foot (from the pipe end within 25m), is closely related to the capillary head borax oxide accumulation, small-diameter steel pipe defect in the front of the capillary the higher the ratio of the rolling zone appears. Through the above analysis we can draw the following conclusions:

　　(1) the presence of perforated capillary end in addition to the adverse effects of oxidation issues that need to be improved.

　　(2) the presence of a work surface and rolling rack rolling defects within the designated road, we need to start to be addressed from the hole, lubrication improvement.

　　(3) Save dryer sheets high total reduction ratio in diameter, in the presence of the shortage of raw tube defects can not be completely eliminated during rolling.

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