Easy way to identify shoddy stainless steel
Published： 2013/01/29     Views: 6266

People tend to think, "stainless steel" is not rusty steel rust, then be sure it is fake and shoddy products. This understanding, of course it is too simple. The first stainless steel plate "stainless" not absolutely does not rust, but relative under certain conditions, does not rust. If the improper use, will be used in the circumstances or conditions beyond its corrosion will naturally rust. Products in stainless steel corrosion, it may be because of the manufacturers selection irrational, that manufacturers for its products use selected inappropriate grades of stainless steel raw materials, may also factory production and processing technology, but relevant. In addition, it is the manufacturers really chosen market authority does not comply with the relevant national or industry standards and shoddy stainless steel raw materials. Does still exist in the current market, production, sales of low-grade stainless steel, as well as shoddy, counterfeit quality certificate market fraud in the procurement of stainless steel how to seize the initiative, quick to see through deception, Free was shoddy stainless harm it? These may be equally bright stainless steel, from appearance to distinguish between true and false pros and cons, and even as an expert is unlikely they will ever do, then what is there easy?
Someone said: It's very simple, with a magnet!! Sucked, gone is good, "stainless steel" suck is poor is stainless iron "! This argument, the approach seems very popular, even scientific journals, TV programs are implemented through this method. For this argument, practices, industry experts give a negative is unscientific and extremely wrong. The world on the development and application of the five main categories of stainless steel 300 series grades, 200 series grades are often non-magnetic (processed or weakly magnetic), and ferritic stainless steel (many 400 series grades), duplex stainless steel, Ma The body of stainless steel, precipitation hardening stainless steel with a magnetic. With or without a magnetic, each stainless steel has its own characteristics and scope of application. 300 series austenitic stainless steel is the most widely used, while increasingly high percentage of use of modern ferritic magnetic type of stainless steel tableware and kitchenware products, home appliances and appliances, decorative, automotive exhaust systems, petrochemical and other civilian the industrial sector can be a partial substitute for the 300 series austenitic stainless steel. 200 such magnets "suck live austenitic stainless steel, manganese, nitrogen generation of nickel, the cost was lower than the 300 series, increase strength, but declined because of its resistance to corrosion, making its applications more narrow, often require high strength, non-magnetic and corrosion resistance less demanding areas, such as springs, electronic equipment. For the currently prevalent in the Chinese market, the so-called "200 series stainless steel, corrosion resistance and value in use is low. These products are not in accordance with existing national standards of production, but in accordance with very strict corporate standards reduced nickel, chromium content in the steel, manganese content, some of which even down to less than 1% nickel, chromium dropped below 10%, manganese increase to more than 14%, the very low pitting equivalent, far less than the corresponding national standards. From the corrosion resistance, these products can not even be called stainless steel, also can not be called the 200 series stainless steel. In the Chinese stainless steel market, it can be said almost no real 200 series stainless steel on the market, the so-called "200 series stainless steel is the biggest problem the steel, shoddy steel and 300 austenitic stainless steel, but it is yet, it is precisely is a non-magnetic austenitic steel! It can be said, magnet pros and cons to identify stainless steel, tend to condone shoddy stainless steel, while crowding out quality magnetic ferrite steels, crowding out non-magnetic and also because of the cost factor in the current Chinese market 300 austenitic stainless steel, and may even make such a shoddy steel fake non-magnetic 300 series austenitic stainless steel used in the industry.
Advantages and disadvantages of magnet to identify stainless steel true and false is clearly not enough, and that there is no easy way of other practical? The answer is yes. This describes a simple method, i.e. the use of stainless steel for the determination of the fluid identification, color change characteristics is generated by observing the measurement liquid in the process of dissolving the measured steel to determine or distinguish between the measured steel some cases. "Color change" is often associated with a particular element as measured in the steel of nickel (Ni), molybdenum (Mo), manganese (Mn), etc..
Stainless steel plate in our market determination of liquid products, imported from Japan and other countries, and there are a lot of domestic. Especially in the more developed areas of China's stainless steel industry and stainless steel scrap recycling industry, such as Jiangsu wearing South, Wuxi, Foshan, Guangdong, Zhejiang, Ningbo and other places, there have been a number of specially developed stainless steel measuring liquid manufacturers, while previously engaged in chemical technology, enterprises of chemical reagents, but also the need for the stainless steel industry has developed a stainless steel measuring liquid. Currently, the the my stainless determination fluid although many brands, but the products seem to be identical, basically be divided into two types of batteries without battery and be equipped with. Without the use of the battery of this is often not subdivided, is mainly determined by viewing the color change of the droplets on the surface of stainless steel after again cf chromatography distinguish. Kind on the market known as "304", it is marked with four standard colors correspond to the four grades of stainless steel --- 201,202,301,304, of which 201 correspond to dark red, 202 corresponding to red, 301 corresponding to shallow red, 304 corresponds to a colorless or pale yellow. These colors are doing test respectively, showing the color of the corresponding kinds of steel with the measured liquid. Battery measured liquid market are many, such as "Mo2 low Ni, Ni2, Ni4, Ni6, Ni8, Ni14, Ni20 alloys, Ni40, of Ni60", etc., and some products in the logo on the "N" instead of "Ni" . These products are used alone or in combination roughly corresponding elements of steel nickel (Ni), molybdenum (Mo), manganese (Mn) content (percentage) can be measured, and then to distinguish between the true and false of steel excellent cf the relevant national authority standard content inferior. Such as "Ni8" Determination of liquid, the first time using the right amount of "Ni8" drug drop of water in a clean steel surface, and then there will be sufficient electricity batteries (generally 9V, manufacturers can Placing) cathode connected steel negative connected "Ni8" on the steel surface the medicine beads (be careful not to come into contact with the steel surface), deenergized after a few seconds the drug beads observation steel surface color changes, the color red, it indicates that the steel contains nickel in 8% and above, otherwise Bead colors will become yellowish or unchanged. Another example is the "low Ni" solution given liquid, Determination of low nickel (Ni), manganese (Mn) is a powerful weapon, such as stainless steel energized oxidation was purple Bead, indicates that the manganese content in steel more than 6%, nickel content is generally less than 5.5%, as energized oxidation colorless or pale yellow, generally is 301,304,430 and other materials. Another example is the "Mo2" Determination of liquid, such as power not faded red complex oxidation indicates that the molybdenum content in steel in about 2% or more ... the use of each product in its manual will have detailed introduction.
The use of stainless steel measuring liquid to a certain extent, we will be able to easily see through the true face of the market, some of the fraud and shoddy stainless steel. Vendors buy 304 grades of stainless steel, for example, we can provide the "304" product testing. Really the case 304, measured using the above "304" or "Ni8" type measurement liquid test should test results, otherwise, it is not really 304; reuse "low Ni" determination was further tested found drugs bead was purple, it indicates that the product is high manganese steel, is likely to be popular in the current market, the corrosion resistance of low shoddy stainless steel, the so-called "200 series stainless steel. For testing to identify the approximate content of specific elements in the measurement of stainless steel measuring liquid, we refer to and understanding of the about Stainless national standards, the chemical composition.
Stainless steel liquid measured using a stainless steel plate to identify, in fact, just a certain extent, to answer "no problem," exactly what the problem but can not really answer. For example: "304" Determination or "Ni8" type determination solution test the businesses so-called "304" product, if the same test results with true 304 products, we must not conclude that it is 304, but only to say " possible "304. Because whether it is energized or not energized, test results, but we judge the measured steel is a necessary but not sufficient condition of a steels (such as 304). If we want to really figure out the exact grades of steel, then it must be a professional chemical analysis or spectral analysis method, a comprehensive determination of its chemical composition, and then control the relevant authority standards were identified. Of course, these methods was measured with the use of stainless steel compared to liquid, more professional and accurate, but the difficulty or cost is also high a lot.
In addition, the level of quality of the stainless steel plate material is not only determined by its chemical composition, its organization, performance, purity and other factors. For the determination of these factors, stainless steel measuring liquid apparently powerless, only by means of a relevant professional tests test.
Determination of liquid products, stainless steel on the market place there are still not enough science to identify other aspects. As mentioned above with "N" in place of "Ni", as well as 200 series stainless steel is divided into "201,202". Also found that the results of some tests are difficult to distinguish visually observed easily lead to errors in the actual use of the process. Test in addition to the more obvious color difference between 201, 202 and 301, 304, 201 and 202, between 301 and 304 of the color change is not obvious. These unscientific and inadequate needed further improvement of the manufacturers concerned.
Anyway, in the procurement of stainless steel products, we should pay attention to the products of the factory inspection certificate or quality certificate, to focus on the credibility of the business, instead of freeloaders, we see through the market to deceive the true colors of behavior and shoddy stainless steel products, aspects, or can take the initiative to take some action. Small bottles of stainless steel on the market measuring liquid, small volume, light weight, easy to carry, the cost of low-cost (per bottle price points varieties ranging from ten dollars to twenty or thirty dollars, the cost of each test only a few cents), the test operation is very simple, after all, a powerful tool and "weapons", we give it a try.