Differences between S30408 and 0Cr18Ni9
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A storage tank has been designed, with the cylinder made of S30408 and the fittings made of 0Cr18Ni9
The components should be the same; the differences may lie in the fact that one is in sheet form while the other is in tube form, with different standards
There are usually standards for where the materials come from. By comparing them, you can see the difference.
The same; it’s basically all 304
A more accurate way to write it is model number + standard number. . .
The material for the cylinder should be S30408 as specified in GB24511-2009, while the material for the fittings should be S30408 as per GB/T14976-2012. Both S30408 are numerical codes for materials; 0Cr18Ni9 is the material grade according to GB/T14976-2002. In that standard, the material grade corresponding to S30408 for pipes is 0Cr18Ni9. It is necessary to use the numerical codes as specified in the latest standards
One is the old standard and the other the new standard; the main difference in their chemical composition lies in the chromium content, which is 17% in one case and 18% in the other
Has 0Cr18Ni9 been discontinued and is no longer in use?
S30408 is what is commonly referred to as 304; 0Cr18Ni9 corresponds to 06Cr19Ni10 in the new standards. In terms of the material itself, there is no difference
In SW6, both materials are used for the takeover tubes and heat exchange tubes; however, the allowable stress of S30408 is lower than that of 0Cr18Ni9, so a coefficient of 0.85 is applied when using it for welded tubes