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Diffusion Rate and Chemical Composition Variance of Nickel Alloys 625 Vs. 825 Multi-Layers

Picture for Diffusion Rate and Chemical Composition Variance of Nickel Alloys 625 Vs. 825 Multi-Layers
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In this paper, a detailed analysis was performed to define the variance between both Nickel alloys 825 and 625 Multi-alloys. A comprehensive experiment and testing was done to evaluate both mechanical and chemical properties for the flanges with weld overlay, fittings and pipe components. The results of the study indicated several challenges and the gaps between both materials. Therefore, an initiative was led to promote the current process in order to prevent reoccurrence and mitigate associated consequences of failure by investigating and defining the root cause analysis. In order to ensure bridging the gaps, the paper concludes with a list of recommendations for the actions taken towards the material and vendor quality in order to proceed forward with the corrective actions and precautions for utilization whenever different PMI readings are found in cladding to continue supplying high quality products as expected.

Product Number: MPWT19-15029
Author: Mohammad Al Sultan, Ahmed Al Maghlouth
Publication Date: 2019
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Picture for High Quality CRA solutions by Electro Slag Process for Austenitic Stainless Steels, 625 & 825 Single & Multiple Layer Solutions
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High Quality CRA solutions by Electro Slag Process for Austenitic Stainless Steels, 625 & 825 Single & Multiple Layer Solutions

Product Number: MPWT19-14343
Author: JP Van Nieuwenhoven
Publication Date: 2019
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Within many features of the Electro Slag Strip Cladding (ESSC) technique, one of the most attractive is the opportunity to achieve a required clad metal chemical analysis in one single layer. All these CRA 308L, 316L, 347, 625 & 825 types frequently concern fabricators who are constantly demanding for ways to reduce production costs & thicknesses of CRA. Hence, new low dilution and high-travel speed solutions have been developed with the aim to reduce the thickness and/or the number of layers in order to answer to industry expectations in terms of productivity. Through controlling dilution with the parent metal and balancing the chemistry by means of the new fluxes, it has been possible to achieve high quality results with an iron content Fe <7% & Fe < 10% for 625 cladding in a single layer where traditional ESSC requires two layers for the same objective. Also, for Alloy 825, single and thin layer solutions have been achieved. This subject presents an overview of these new developments with details on the applied welding conditions and the quantitative results achieved, showing benefits in terms of material savings and productivity gains.
Picture for Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments
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Corrosion of Nickel Alloys in Elevated Temperature Sour Gas Environments

Product Number: 51317--9135-SG
ISBN: 9135 2017 CP
Author: Robert Rettew
Publication Date: 2017
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Test results for four alloys in six different sour environments are presented. Alloys 625, 825, 316L and carbon steel were testing in sour gas with varying exposure to moisture at 280°C. Corrosion rates for each alloy over a 30 day period are measured from mass and thickness changes.
Picture for 10262 Corrosion Resistance of Nickel Alloys and Super Austenitic Stainless Steel Weld Claddings
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10262 Corrosion Resistance of Nickel Alloys and Super Austenitic Stainless Steel Weld Claddings as a Function of Dilution

Product Number: 51300-10262-SG
ISBN: 10262 2010 CP
Author: Dirk Aberle, Martin Wolf and Friedrich Stenner
Publication Date: 2010
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Nickel alloys UNS N06625, UNS N06059, UNS N06022, UNS N08825 and one Special Stainless Steel (UNS N08031) are overlay welded in 1 to 3 layers on carbon steel. The dilution is measured and results of pitting corrosion in an immersion test with “Green Death” solution will be discussed.
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