It is also stronger and is less susceptible to corrosion. At this point in technology, the 630 type is perhaps right up there with the K-500 Monel competing for the top spot as the "best shaft material." Type 630 is priced higher than the other kinds of stainless steel materials. Type 316 is a lot less vulnerable and as such, it is much better suited for use in salt water. When it comes to crevice corrosion, types 303 and 304 are widely viewed as the worst. When used in salt water, stainless steel shaft is vulnerable to pitting which often results in crevice corrosion. All of them are strong, particularly the 630 variety. Typically, the stainless steels used to make propeller shafts include types 630, 316, 304, and 303. Naval brass has a content of approximately 60 percent copper, while bronze must have a copper content of 90 percent or more this makes it more superior. The copper bearing metals commonly used for propeller shafting are Monel alloys, Naval brass, and a variety of bronzes. However, salt water can cause a range of corrosion problems, making the task of selecting an appropriate shaft material more crucial.īasically, shaft materials are typically made of a variety of stainless steels or copper bearing materials. As such, the propeller shaft will, most likely, be less expensive. If intended solely for fresh water use, corrosion problems should not be a major issue. These include whether the boat will be exclusively used in fresh water or be operated in brackish or salt waters. The "best" shaft material depends on a number of different variables.
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