What material is 30403?
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As the title suggests, please ask an expert to explain in detail!!!!!
Reply to 1# huimengling: I’ve been looking at it for a while; it’s said to be stainless steel, but the 304 type of stainless steel that I’m familiar with is quite common. I’ve never seen 30403 before – does it represent some larger category? I don’t know for now
30403 is a type of stainless steel; it is essentially the same as the original 304 stainless steel. 30403 is a new grade.
New designation for 304? ? :o
This post was last edited by Black gold on 2011-5-13 at 13:56. 1. Stainless steel 30403 is ordinary stainless steel. In GB/T 20878, its serial number is 18; its unified numerical code is S30403. The new grade designation is 022Cr19Ni10, while the old grade designation is 00Cr19Ni10. 2. There is also stainless steel S30408. In GB/T 4237-1992, its grade designation is 0Cr18Ni9; in GB/T 4237-2007, it is designated as 06Cr19Ni10; and in GB24511-2009, it is referred to as S30408/06Cr19Ni10. In reality, these all refer to the same material – only the standards have changed, the names have changed, and there have been slight adjustments to the composition. In the new standards of 2009, 06Cr19Ni10 replaced 0Cr18Ni9, just as Q345R replaced the previous 16MnR. It’s just a different name; however, for steel pipes, the 0Cr18Ni9 grade is still commonly used. For sheets, the 06Cr19Ni10 grade is mostly employed nowadays. Additionally, 316L has been replaced by S31683. S31683 is an old American grade, equivalent to ER316L, which corresponds to China’s H03Cr19Ni12Mo2Si. S31680 is equivalent to ER316, corresponding to China’s H08Cr19Ni12Mo2Si. Other specific grades should be indicated as well, but I don’t have detailed information on them. I only noticed these changes because I saw them in the design documents prepared by the design institute during an expansion project. If any marine enthusiast has detailed information, please upload and share it. Thank you!
This post was last edited by zgtysb on 2011-5-14 at 11:24. It’s enough to know that it’s stainless steel
It’s the issue of old and new grades, that is, 304L
GB24511-2009 provides a table comparing old and new grades of stainless steel; 30403 is what used to be called 304L, and it is now referred to as 022Cr19Ni10