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51317--9636-Optimizing Composition Fabrication and Inspection of Chromium Carbide Overlay (CCO) for Oil Sands

Lab tests, assessments and technical studies/literature reviews were done concerning common commercial Chromium Carbide Overlay (CCO) products to understand the effects of overlay composition and welding parameters on underbead cracking, mechanical properties, and wear/abrasion resistance.

 

Product Number: 51317--9636-SG
ISBN: 9636 2017 CP
Author: Duane Serate
Publication Date: 2017
$0.00
$20.00
$20.00

Chromium Carbide Overlay (CCO) has long been used in Canadian oil sands mining industry to protect process equipment and piping from severe abrasion erosion and erosion/corrosion. However CCO with poor quality had led to many premature failures in the field service and resulted in high production/maintenance loss for oil sands operators. Most of the failures were due to the spallation of CCO under sliding/impact wear. Shell Wear Technology Team had conducted extensive lab tests (ASTM G65 Rotary Impact Test and metallography) and studies on most commercial CCO products in the market. This research sought to understand the effects of overlay composition and welding parameters on underbead cracking impact resistance and abrasion resistance of CCO. The study revealed that the extent of underbead cracking is related to the welding heat input and consequently affects the spallation resistance of CCO. The paper concludes with a general guideline on how to improve the CCO performance under sliding and impact wear by optimizing composition fabrication and inspection techniques. A new inspection methodology developed by Shell is also presented to properly determine the extent of underbead cracking.

Key words: Chromium carbide overlay, wear, ASTM G65A, impact test, underbead cracking

Chromium Carbide Overlay (CCO) has long been used in Canadian oil sands mining industry to protect process equipment and piping from severe abrasion erosion and erosion/corrosion. However CCO with poor quality had led to many premature failures in the field service and resulted in high production/maintenance loss for oil sands operators. Most of the failures were due to the spallation of CCO under sliding/impact wear. Shell Wear Technology Team had conducted extensive lab tests (ASTM G65 Rotary Impact Test and metallography) and studies on most commercial CCO products in the market. This research sought to understand the effects of overlay composition and welding parameters on underbead cracking impact resistance and abrasion resistance of CCO. The study revealed that the extent of underbead cracking is related to the welding heat input and consequently affects the spallation resistance of CCO. The paper concludes with a general guideline on how to improve the CCO performance under sliding and impact wear by optimizing composition fabrication and inspection techniques. A new inspection methodology developed by Shell is also presented to properly determine the extent of underbead cracking.

Key words: Chromium carbide overlay, wear, ASTM G65A, impact test, underbead cracking

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