Abstract
Many high temperature alloys are used in tubular forms, but most of creep strength or creep-rupture strength data for these materials are based on simple tension bar specimens. The high-temperature strength data based on bar specimens can't eliminate many of discrepancies between test of specimens and actual service. Many of investigators have developed the method closely simulated actual service condition. This method is the creep-rupture test adopted for a tubular specimen under internal steam pressure and at a controlled temperature. The author compared the creep-rupture characteristics of tubular and bar specimens for rolled material and welded joint. The following results were obtained:(1) Agreement between the data of tubular and bar specimens of 18 Cr-8 Ni·Ti steel is good when the equivalent stress in tube wall is calculated on the formula which developed in ASME.(2) In case that the strength of weld metal is stronger or indicates a similar degree of strength as compared with base metal, the creep-rupture strength of 18Cr-8Ni·Ti welded joint indicates the similar strength in comparison with base metal.(3) In case that the strength is weaker than base metal, this 18Cr-8Ni·Ti welded joint decreases in high-temperature strength. But the degree of strength-lowering in the test applied to the bar specimen is more remarkable than that in the case applied to the tubular specimen.(4) The creep-rupture strength of dissimilar joint between 18 Cr-8Ni·Ti steel and 21/4 Cr-1 Mo steel is lower than the strength of 21/4 Cr-1 Mo steel. But, the degree of strength-lowering is more remarkable in the case of the bar specimen than in the case of the tubular specimen.
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