Abstract
Wear on sugar cane rolls is an expensive maintenance problem for the sugar cane industry. Wear produces loss of sucrose extraction and loss of grip of the roll on the bagasse. This paper presents the evaluation of wear and loss of grip of hypoeutectic and hypereutectic high chromium welding deposits applied on ASTM A-36 steel and gray cast iron. A modified ASTM G-65 standard test was used. Wear was produced by the abrasive action of wet bagasse with three levels of mineral extraneous matter. Silica grains with sizes in the range of 0.212-0.300 mm (AFS 50/70) were used as mineral extraneous matter. Grip was evaluated by measuring the torque on the power transmission shaft that moves the specimens. Worn surfaces were characterized by using scanning electron microscopy. Wear was found to increase proportionally related to the mineral extraneous matter content. Geometric changes of the weld deposits related to wear caused grip loss. For low mineral extraneous matter level, wear resistance of carbon steel was greater than that of gray cast iron; whereas the opposite was found for high mineral extraneous matter level.
Highlights
One of the most important stages of the sugar cane process is crushing, where juice is extracted from the shredded cane by compressing it between grooved rolls
This paper presents the evaluation of wear and loss of grip of hypoeutectic and hypereutectic high chromium welding deposits applied on ASTM A-36 steel and gray cast iron
This paper shows the results of a research project undertaken to evaluate wear and grip loss produced by wear on two base materials: ASTM A-36 steel and gray cast iron class 50, both materials hardfaced with hypoeutectic or hypereutectic high chromium white cast irons
Summary
One of the most important stages of the sugar cane process is crushing, where juice is extracted from the shredded cane by compressing it between grooved rolls. Wear produces loss of the original geometry of the teeth of the rolls producing loss of compaction and decreasing the extraction. Wear produces loss of roughness on the roll surface [1] and decreases the grip of the roll over the sugar cane producing a poor feeding to the mill. Hardfacing welding deposits are applied to the teeth to protect the surface and decrease wear, since these hardfacing deposits are made with alloys of high wear resistance. Some welded particles are eventually detached from the rolls and contaminate the cane, affecting later stages of the process
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