API TR 21TR1
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Technical Report on Materials Selection for Bolting, First Edition, Includes Addendum 1 (2020), Addendum 2 (2020), and Addendum 3 (2022)
This document provides guidance for the selection of materials and manufacturing processes for low-alloy steel bolting manufactured in accordance with API Specification 20E and nickel-based and stainless alloys manufactured in accordance with API Specification 20F. Table 2 and Table 3 are provided as guidance for materials selection of fasteners.
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