Effect of Sb,P, Sn and B on the microstructure and creep properties of normalized and tempered 1.25 Cr−0.5 Mo Steels |
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Authors: | R Viswanathan |
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Affiliation: | (1) Westinghouse Research Labs, 15235 Pittsburgh, PA |
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Abstract: | A program to study the effect of Sb, P, Sn and B on creep properties of four normalized and tempered 1.25 Cr−0.5 Mo steels
at 538°C (1000°F) has been completed. Results show that even a combined addition of large amounts of Sb, P and Sn does not
affect short time creep strength or ductility of the steel at 538°C (1000°F). Addition of B resulted in an increase or decrease
of creep strength depending on the nature of the impurity species present, presumably due to B-impurity interactions. Regardless
of the effect on creep strength, B additions caused sharp reductions in rupture ductility in all cases. Comparison of the
present results on the four laboratory steels (100 pct bainite) with results of a previous study on a commercial steel (60
pct bainite + 40 pct ferrite) show that the effect of microstructure becomes negligible and rupture strength values of the
various steels at 538°C (1000°F) approach each other at rupture times in excess of 104 h. |
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Keywords: | |
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