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The Analysis of SA-335 P22 High Pressure Boiler Tube Defect and Its Improving Measure |
Liu He-Ping |
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Abstract A lot of external cracks appear after piercing of SA-335P22 high pressure boiler tube bloom, they looks special and distribute randomly. Optical and digital microscope analysis of cracks, acid leaching test of bloom and acid leaching sample test, indicate that the defect caused by bloom’s internal fine cracks. Measures of lowering the liquid steel superheat, decreasing the casting speed of bloom and reduction billet’s secondary cooling strength are obviously effective to reduce such kinds of defects.
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Received: 04 August 2008
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