WRC 576:2020

$29.25

Recognition of UNS K91060 (Alloy 115, aka T115) Alloy in API 579-1/ASME FFS-1 and API Std 530

Published By	Publication Date	Number of Pages
WRC	2020	74

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Category: WRC

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Description

Alloy 115 (T115) is a highly creep resistant ferritic steel containing a chromium content of 11 wt%. Achromium content of this amount not only gives excellent high temperature creep properties (up to 650°C[1202°F]), but also provides sulfidation resistance. The ferritic microstructure provides increased thermalconductivity and lower thermal expansion characteristics, compared to higher-alloy austenitic materials,which offers advantages in high temperature applications. While increased chromium content providesbetter creep and high temperature oxidation resistance, the manufacturing and welding procedures arecomparable to those of Grade 91 (9 wt% Cr). Alloy 115 was developed by Tenaris, primarily for supercriticaland ultra-supercritical boiler applications, but is being considered for use in petrochemical industry(including oil refinery) fired heaters, given its creep and sulfidation resistance. Tenaris provided theMaterials Properties Council (MPC) of Welding Research Council, Inc. (WRC) with available creep andrupture data for analysis. E2G | The Equity Engineering Group, Inc. analyzed the results on behalf of WRCand developed high temperature material properties based on the methodology outlined in WRC Bulletin546. This WRC Bulletin records the data provided by the supplier, as well as the analysis performed andresulting material properties. Material properties provided include Larson-Miller method Properties andMPC Omega method properties for base materials. For applications outside of fired heaters, wherelongitudinally welded product forms may be utilized, guidance is provided in this Bulletin for adjustments tobase material properties. This is achieved by either substitution of a weld Larson-Miller constant, ,for the Larson-Miller constant , or by adjustments to the MPC Omega method strain rate andcreep ductility adjustment factors (respectively, ?OSR and ?OCD). In most cases, data and properties areexpressed in both US customary and metric units. It is anticipated that additional test results will be reportedin the future, potentially justifying expansion of the useful temperature range or increases to the materialcreep strength.

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