The difference between stainless steel and stainless iron
Thread Content
Stainless steel generally refers to the collective term for stainless steel and acid-resistant steel. Stainless steel refers to steel that is resistant to corrosion by weak media such as the atmosphere, steam, and water, whereas acid-resistant steel refers to steel that is resistant to corrosion by chemically aggressive media such as acids, alkalis, and salts. Stainless steel has been around since the beginning of this century, and it now has a history of over 90 years. The invention of stainless steel was a major achievement in the history of world metallurgy. Its development provided an important material and technical foundation for the growth of modern industry and scientific progress. There are many types of stainless steel, each with different properties, and several major categories have gradually emerged throughout its development. Classified by organizational structure, they are divided into four main categories: Martensitic stainless steels (including precipitation-hardening stainless steels), ferritic stainless steels, austenitic stainless steels, and austenitic-ferritic duplex stainless steels ； Classified by the main chemical components in steel or certain characteristic elements present in it, they include chromium stainless steels, chromium-nickel stainless steels, chromium-nickel-molybdenum stainless steels, as well as low-carbon stainless steels, high-molybdenum stainless steels, and high-purity stainless steels ； Classified according to the performance characteristics and applications of steel, they include nitric acid-resistant stainless steel, sulfuric acid-resistant stainless steel, pitting-resistant stainless steel, stress corrosion-resistant stainless steel, high-strength stainless steel, etc ； Classified by the functional properties of steel, they include low-temperature stainless steels, non-magnetic stainless steels, free-cutting stainless steels, superplastic stainless steels, and so on. The commonly used classification methods at present are classification based on the microstructural characteristics of steel, its chemical composition, and a combination of both. They are generally classified into martensitic stainless steels, ferritic stainless steels, austenitic stainless steels, duplex stainless steels, and precipitation-hardening stainless steels, or into two main categories: chromium-based stainless steels and nickel-based stainless steels. Stainless steel is generally used in environments where corrosion resistance is required, as well as in medical devices and household items. The so-called \"stainless iron\" is produced by reprocessing recycled scrap metal, lead, steel, etc. through further melting and purification processes to remove impurities. The traditional method for detecting it involves using a magnet, but this material cannot be identified using such traditional methods; thus, it manages to deceive many people making choices regarding materials for construction projects. As a result, it finds its way into one decoration project after another, ending up in various luxurious curtain walls. This name emerged after it was brought to light by the program \"Focus Interview,\" and it holds about 65% of the market share; whereas genuine standard SUS304 stainless steel products do not find a market due to their higher prices. The reason why \"stainless iron\" products hold a 65% share in the market is largely due to their price. Currently, the price of standard stainless steel products is around 20,000 yuan per ton, while the price of standard 7075 aluminum alloy is about 16,000 yuan per ton; in contrast, the price of \"stainless iron\" is only 5,000–7,000 yuan per ton ； Looking further at the tensile strengths of these three materials, they are as follows: standard stainless steel ranges from 530–620 MPa, standard 7075 aluminum alloy ranges from 540–560 MPa, while \"stainless iron\" has a tensile strength of 160–180 MPa. Obviously, the tensile strength of \"stainless iron\" is not even one-third that of stainless steel, which makes it highly likely to cause accidents.
Learn*, learn* – the market is full of scammers these days, and it’s very easy to get deceived.
I’ve learned something new; I really didn’t know such a thing as “stainless steel” existed
I’ve learned something new~~~ It seems like someone is faking it. I need to find out how to identify this stainless steel properly; it wouldn’t be good to get scammed.
I used to find shiny tableware to be very pleasing. Later, I went to the site of a company that manufactures tableware, and it was only after talking with the people there that I learned that the tableware they produce is actually made of stainless steel. It’s cheap, and its appearance is similar to that of pure stainless steel. During the processing, using an atmosphere for protection yields better results. Since then, I have never trusted stainless steel tableware again. Industry insiders say that 80% of tableware is made of stainless steel.
This is really the first time I’ve heard of something called “stainless iron”. It’s interesting to learn about it; thank you
Does the original poster have a good way to distinguish them?
It’s a valuable lesson; be more careful when buying stainless steel pipes in the future
Is there also “stainless steel”? I say that all the projects these days are of poor quality
Using stainless steel in tableware and similar items is less of a concern; however, using it in industrial equipment can lead to serious problems. Therefore, when purchasing stainless steel equipment, it is essential to specify the material requirements clearly in the contract, thereby shifting the risk to the equipment manufacturer.
The original poster posted a great post; it’s only now that I realize that many stainless steels are actually iron-based products.
It’s really eye-opening – the material quality is indeed a major issue; poor-quality products simply can’t be produced
Chinese people are far more skilled at falsifying things than at creating genuine products; hence, extra caution is needed when working on construction sites, as using the wrong materials can lead to serious accidents.