The 45mn blades used for transporting coal slurry wear out very quickly – are there more wear-resistant blade materials available?
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The blades of the screw used for transporting cinder have worn out; it’s currently made of 45 manganese steel. To improve its wear resistance, what material would be suitable? This post is also being discussed in the Moving Equipment section; everyone is welcome to share their thoughts
Judging from the picture, it doesn’t seem to have been ground to that state; rather, it looks like it broke due to insufficient strength. 45Mn is a medium-carbon quenched and tempered steel whose strength, toughness, and hardenability are all higher than those of 45 steel. After quenching and tempering, it achieves good overall mechanical properties; its machinability is satisfactory, but its weldability is poor, its cold-forming plasticity is low, and it tends to develop temper brittleness. This steel is generally used in its quenched and tempered state, with a service temperature range of -20 to 425°C. It is primarily used as a substitute for 40Cr steel in the manufacture of quenched and tempered parts with medium and small cross-sections. The cross-sectional area of the spiral blade seems to be quite large; the yield strength of 45Mn is ≥375 MPa, and its weldability is poor. Judging from the photo, almost all of the blades at the bottom are missing; this area is likely to be a pile of coal slag. As a result, these blades are subjected to the greatest stress. Additionally, the welding properties of 45Mn material are poor, and it can be seen that the blades broke at the welding points, with the breaks not appearing to be caused by wear. The poster might consider using 65Mn in its annealed state; 65Mn in its returned state has better welding properties, and its yield strength is ≥784 MPa, which is twice that of 45Mn. The material must be in the annealed state, as 65Mn in its unannealed state also has very poor welding properties. These are just my humble opinions; I welcome feedback from all fellow sailors.
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It’s just my personal opinion; please forgive me. I hope professionals in materials fields will take a look; it would be great to be able to learn something from them*