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01161 Erosion/Corrosion Behavior of Weld Overlays in HCI Containing Atmospheres

Picture for 01161 Erosion/Corrosion Behavior of Weld Overlays
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Product Number: 51300-01161-SG
ISBN: 01161 2001 CP
Author: George Lai, Christopher Van Lienden and Peggy Y. Hou
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Erosion/corrosion behavior of various weld overlays has been studied in a laboratory erosion test rig, which was designed to simulate dense particle impacts under fluidized-bed conditions. Weld overlay alloys under study included Types 309 SS and 312 SS, Alloy 625, Alloy 133 and Alloy 140. The overlay was applied to carbon steel tubing for preparation of test specimens. Overlaid specimens were tested in comparison with a bare carbon steel specimen. Testing was conducted at 316 C (600 F) for about 20 hours in air containing about 250-280 ppm (by volume) HCl. After testing, metal wastage was measured circumferentially using a profilometer. Surface damage characteristics were studied by scanning electron microscopy. Under the current test conditions, it was concluded that carbon steel suffered erosion/corrosion attack due to enhanced oxidation resulting from HC1. Type 309 SS, Type 312 SS and Alloy 625, which exhibited somewhat better resistance than carbon steel, suffered essentially erosion attack with little or no oxidation. Two hardfacing materials, Alloy 133 and Alloy 140, exhibited significant reduction in wastage primarily due to their erosion resistance.
Erosion/corrosion behavior of various weld overlays has been studied in a laboratory erosion test rig, which was designed to simulate dense particle impacts under fluidized-bed conditions. Weld overlay alloys under study included Types 309 SS and 312 SS, Alloy 625, Alloy 133 and Alloy 140. The overlay was applied to carbon steel tubing for preparation of test specimens. Overlaid specimens were tested in comparison with a bare carbon steel specimen. Testing was conducted at 316 C (600 F) for about 20 hours in air containing about 250-280 ppm (by volume) HCl. After testing, metal wastage was measured circumferentially using a profilometer. Surface damage characteristics were studied by scanning electron microscopy. Under the current test conditions, it was concluded that carbon steel suffered erosion/corrosion attack due to enhanced oxidation resulting from HC1. Type 309 SS, Type 312 SS and Alloy 625, which exhibited somewhat better resistance than carbon steel, suffered essentially erosion attack with little or no oxidation. Two hardfacing materials, Alloy 133 and Alloy 140, exhibited significant reduction in wastage primarily due to their erosion resistance.
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