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What are the methods of judging the national standard stainless steel pipe?

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This is a very important issue for engineers who do stainless steel pipe projects, because if you use non-national standard stainless steel diamond pipe products, you may fail the acceptance criteria during project acceptance. Then distinguish whether you bought the national standard 3 aspects to judge:
1. The material of stainless steel
The state has standard data on the material of 304-201-316 stainless steel pipes, that is, the content standard of each metal element of stainless steel diamond pipes: 201 stainless steel pipes (1 Cr17Ni17)-304 stainless steel pipes (0 Cr18Ni9)-316 stainless steel pipes (0 Cr17Ni12Mo2). If you buy a 201-304-316 stainless steel pipe with a content lower than this standard, then you buy a stainless steel pipe that does not conform to the national standard.
Now the more commonly used stainless material is 304 material and 201 material, because 201 is a relatively poor raw material, so the user is most concerned about whether the 304 is up to standard. 304 the most important chemical element content standard is 8% nickel 18% chromium, some poor 304 materials in some elements will exceed the standard such as carbon content, although it is poor but also up to standard. The user is most worried about the 301 charging 304 or more serious is the 201 charging 304, because it does not meet the 304 standard, naturally does not play a 304 role in rust prevention, but this situation is rare now, many well-known manufacturers still use high-quality raw materials.
2. Stainless steel pipe specifications
The country has the specifications of stainless steel pipe products designed by the design institute for each project, and has a series of specifications and models for each caliber stainless steel pipe. Before purchasing, you can refer to the GB stainless steel pipe specification sheet to purchase.
I believe those who are familiar with stainless steel pipes know that at first there were not many specifications of stainless steel pipes, but later there were more and more specifications, and we called non-standard pipes with more specifications. The emergence of non-standard pipes is mainly due to the fact that some illegal project bosses make a fuss about specifications in order to cut corners, such as 50 instead of 51 and 60 instead of 63, which cannot be seen by naked eyes alone. Therefore, manufacturers also make many non-standard pipes to cater to the market to satisfy customers.
Therefore, when you buy stainless steel pipes, you should try your best to choose a manufacturer of national standard stainless steel pipes. For example, Zhonglian Stainless Steel Pipe is one of the few manufacturers of stainless steel pipes that do not do national standard, and these important parameters of national standard are stamped on the stainless steel pipes.
3. Thickness of stainless steel pipe
The national standard stainless steel pipe pair has a standard thickness for each caliber. Some manufacturers will produce some products with regional national standard thickness in order to cut corners, but there will also be the problem of project acceptance.
The thickness standard of stainless steel pipe is plus or minus 2c, but the real local market situation is that many people are making false marks. This is not the real thickness of the pipe. For example, the 1.0 of the mark is actually only 0.7. This is actually an opportunity for some illegal engineers to make the thickness thinner. In fact, there are some manufacturers who still do not make false targets, such as Zhonglian Stainless Steel and other pipe factories, which have set an example of honesty and trustworthiness.
These three are the national standards for stainless steel that users are concerned about. If you want to know whether the stainless steel pipe you bought is the national standard, please go back and see if it meets the standard.