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  1. allab

    PWHT as per B31.3

    Gentlemen: We have a 24-inch x 19.05mm thick alloy pipe, A691, Grade Cr. 1-1/4, Class 32. Table 331.1.1 of B31.3 indicates that heat treatment is required for alloy steels with Cr content greater than 1/2% and less than or equal to 2%. Does this table 331.1.1 supersedes the B31 (.1 or .3) PWHT...

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