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96434 Effects of Fabrication Practices and Techniques on the Corrosion and Mechanical Properties of Ni-Cr-Mo Nickel Based Alloys UNS N10276, N06022, N06686, and N06625

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Product Number: 51300-96434-SG
ISBN: 96434 1996 CP
Author: Evan B. Hinshaw, James R. Crum
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Ni-Cr-Mo alloys have excellent resistance to both oxidizing and reducing type environments; however, heat treating, surface condition, welding, and type of welding consumable can have a significant affect on the corrosion resistance and mechanical properties of these alloys. It is also important when performing standard ASTM intergranular corrosion tests on welded test coupons to make an accurate comparison of alloys being tested. A standard weld procedure and consistent postweld sample conditioning method should be incorporated into the comparison test program. An evaluation of the effect of various fabrication practices on the corrosion resistance of the alloy was performed using accelerated corrosion tests ASTM G28B. The fabrication conditions examined were as-welded, welded-pickled, welded-annealed-pickled, welded annealed ground, welded-ground, using over matching filler metals, and various levels of heat input. In addition to fabrication techniques, the effect of ASTM G28B test duration on corrosion rates of UNS N10276, N06022, N06686, and N06625 was evaluated. ASTM G28A intergranular corrosion and mechanical testing using welded coupons of UNS N06625 were also performed to determine the affect of post-weld annealing and aging heat treatments on the corrosion resistance and mechanical properties of UNS N06625. Keywords: nickel alloys, welding, corrosion testing, chromium, molybdenum, fabrication, heat treating, pickling, grinding, UNS N 10276, N06022, N06686, N06625, filler metal, test-time.
Ni-Cr-Mo alloys have excellent resistance to both oxidizing and reducing type environments; however, heat treating, surface condition, welding, and type of welding consumable can have a significant affect on the corrosion resistance and mechanical properties of these alloys. It is also important when performing standard ASTM intergranular corrosion tests on welded test coupons to make an accurate comparison of alloys being tested. A standard weld procedure and consistent postweld sample conditioning method should be incorporated into the comparison test program. An evaluation of the effect of various fabrication practices on the corrosion resistance of the alloy was performed using accelerated corrosion tests ASTM G28B. The fabrication conditions examined were as-welded, welded-pickled, welded-annealed-pickled, welded annealed ground, welded-ground, using over matching filler metals, and various levels of heat input. In addition to fabrication techniques, the effect of ASTM G28B test duration on corrosion rates of UNS N10276, N06022, N06686, and N06625 was evaluated. ASTM G28A intergranular corrosion and mechanical testing using welded coupons of UNS N06625 were also performed to determine the affect of post-weld annealing and aging heat treatments on the corrosion resistance and mechanical properties of UNS N06625. Keywords: nickel alloys, welding, corrosion testing, chromium, molybdenum, fabrication, heat treating, pickling, grinding, UNS N 10276, N06022, N06686, N06625, filler metal, test-time.
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In the present study, corrosion behavior of base metal (BM), all-weld-metal (AWM) and heat-affected-zone (HAZ) samples of C-276 (UNS N10276), C-22 (UNS N06022) and C-2000 (UNS N06200) alloys were evaluated in concentrated hydrochloric (HCl), sulfuric (H2SO4) and nitric acid (HNO3).

 
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