Stainless steel material testing problem?
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This post was last posted by Benbenxuan on 2009-8-25 11:29. Generally speaking, magnets can be used to detect stainless steel if it is above 304. However, magnets are not very effective for detecting stainless steel if it is lower than 304. Do you have any good methods to detect stainless steel in actual projects?
You can refer to this post http://bbs.hcbbs.com/viewthread.php?tid=502590 http://bbs.hcbbs.com/viewthread.php?tid=395791
1. There is an instrument in engineering that can perform qualitative and quantitative testing. It is easy to detect whether the pipe material is qualified, but the price is relatively expensive. I forgot the name. 2. In addition, the supplier is required to provide test reports and test methods.
The most reliable is chemical analysis, but it is also the most inconvenient. Generally, we use spectrum analysis. There are portable spectrum analyzers, such as radioactive ones (cannot analyze carbon) or another type (sorry, can't remember, but can analyze more than ten elements such as carbon). During the construction of refining and chemical plants in the Middle East market, standard specifications require that every pipe fitting and every weld be subjected to spectral analysis.
You cannot fully trust the analysis provided by the manufacturer. You can outsource the analysis to a unit with analytical qualifications and compare it with the manufacturer's analysis results.
1. Try to purchase stainless steel products from manufacturers with high quality and high reputation. 2. Check the product quality certificate submitted by the manufacturer. 3. Appearance inspection. 4. PMI, positive material identification, uses a spectrometer to detect the content of various elements in stainless steel products to check whether they comply with standard specifications and design requirements. When appropriate, a third party can be entrusted with testing.
Just do chemical analysis. If you want to know the content of an element, just measure it. It’s more reliable. That’s what I do here.
This post was last edited by Benbenxuan on 2009-8-4 11:03. You can buy a portable alloy detector. I remember it cost more than 20,000 yuan. It can directly tell you the alloy composition and give the corresponding grade. How to use: Directly press the instrument's spectrum probe against the material, and various data will be displayed on the screen in a few seconds.
A portable spectrometer seems to cost 5 yuan per click. I forgot, one tube costs about 5 points.
Use a metal composition detector. The practice of using magnets to test stainless steel has long been outdated. Today's stainless iron cannot be detected with a magnet.
The poster used a magnet for testing. This method is not good. First of all,: When the nickel content in stainless steel is greater than 9, it can be tested with a magnet. If the nickel content is less than 9, this method cannot be used. However, some stainless steel with less than 9 does meet the requirements. * * Standard stainless steel, of course, there are many models of stainless steel, and it cannot all be tested with a magnet. Remember! The best way to detect is: sampled * * It is best to conduct laboratory analysis by a recognized and qualified testing department. Otherwise, even if the magnet can be absorbed, S and P may exceed the standard.