Is there a grade called 0Cr19Ni9?
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I would like to ask fellow marine engineers: Is the grade 0Cr19Ni9 specified in the basic design documents compliant? Is it necessary to request corrections from the design institute? Additionally, since it is said to be a cast structure of this material, can it indeed be cast?
This post was last edited by niat8888 on 2015-12-24 19:11. If it is a casting. . Generally, there’s a letter that starts with ZG. . It can only be said that the description is not standardized. . Saw a ZG08Cr19Ni9
This grade is equivalent to 304.
So what is the difference between it and 0Cr18Ni9? Why isn’t it included in the standards? Should it be corrected to a new grade or the same numerical code in the design documents?
Is it worth informing the design institute about such a minor issue? If changes are needed, should it be changed to 0Cr18Ni9, or some other new grade, or S30408?
Currently, the grades of stainless steel are rather confusing. To figure things out, one must first determine which standard is being used in the design – whether it relates to sheets, pipes, forgings, or castings – and whether they are intended for use in equipment, pipelines, valves, or structural components. Different materials have different standards, and different standards correspond to different grades. In fact, all you need to do is respond to the designer by saying, \"Please specify the grades as defined by the current standards.\" In practical applications, it’s sufficient to consider them all as 18-8 series stainless steel, as this will not result in significant errors.
Yes. 0Cr19Ni9 (0Cr18Ni9) stainless steel is equivalent to American 304 stainless steel; the chemical composition of the Japanese grade SUS304 differs slightly, but its uses are the same.
It is a cast component within a valve
It’s better not to mention such minor issues. For the castings used in valves, check the relevant valve standards; these standards will include references to other standards, and within those standards you will definitely find the correct answer you’re looking for. Valves labeled B8 according to American standards are quite common; this corresponds to China’s 18-8 series. In any case, the designation codes are rather confusing, so to be accurate one needs to check each standard individually! There are so many standards! ! ! ! ! ! ! ! ! ! ! ! !