From the analysis of the ASME SA213 T11 boiler pipe chemical composition, metallographic structure, macroscopic and microscopic fracture of the pinhole defect, it can be seen that the chemical composition and the metallographic structure of the ASME SA213 T11 boiler pipe are all normal, and the possibility of the crack caused by the expansion of the ASME SA213 T11 boiler pipe is relatively small.
A large number of slag inclusions have been found on the micro fracture surface of ASME SA213 T11 boiler pipe pinhole crack. It is concluded that the large slag inclusion is one of the important reasons for the crack of ASME SA213 T11 boiler pipe flaring. The collapse of the slag retaining wall in the tundish is the main cause of a large amount of slag inclusion in ASME SA213 T11 boiler pipe, so the following improvement measures are taken:
1. replacing high quality ASME SA213 T11 boiler pipe slag retaining wall;
2. sending special person to observe the condition of tundish slag retaining wall during continuous casting;
3. when ASME SA213 T11 boiler pipe slag retaining wall collapses, the casting is stopped immediately and quality evaluation is carried out.
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