Generally, it cannot be judged by chemical inspection. The difference between stainless steel plate and stainless steel is the level of nickel-containing components. Some people say that magnetic is iron, and non-magnetic is stainless steel. This is completely wrong. There are four major stainless steels.stainless steel factory System, austenite, martensite, ironite and duplex, in which austenite is not magnetic, but due to the loss of certain elements during processing, it is slightly magnetic; so it is recommended that you pass chemical inspection and stainless steel The composition comparison table is used for judgment.
Many of the everyday items that appear on the market today, despite the stainless steel on the signboard, are actually “stainless iron” products.
So what is the difference between stainless steel and stainless steel? First let’s take a look at what is stainless steel and stainless steel? Distinguish from the meaning:
Stainless steel is generally a general term for stainless steel and acid-resistant steel. Stainless steel refers to steel that is resistant to corrosion by weak media such as atmosphere, steam and water, while acid-resistant steel refers to steel that is resistant to corrosion by chemically etched media such as acid, alkali and salt. Stainless steel, which has been around since the beginning of this century, has a history of more than 90 years. The invention of stainless steel is a major achievement in the history of metallurgy in the world. The development of stainless steel has laid an important material and technical foundation for the development of modern industry and scientific and technological progress.
There are many types of stainless steel and different properties. It has gradually formed several major categories in the development process. According to the structure of the organization, it is divided into four categories: Markov stainless steel (including precipitation hardening stainless steel), ferritic stainless steel, austenitic stainless steel and austenitic and ferrite duplex stainless steel; according to the main chemical composition in steel or Some characteristic elements in steel are classified into chromium stainless steel, chrome-nickel stainless steel, chrome-nickel-molybdenum stainless steel, low-carbon stainless steel, high-molybdenum stainless steel, high-purity stainless steel, etc.; according to the performance characteristics and use classification of steel, it is divided into 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 according to the functional characteristics of steel, divided into low temperature stainless steel, non-magnetic stainless steel, free cutting stainless steel, super plastic stainless steel and so on.
At present, the commonly used classification methods are classified according to the structural characteristics of steel and the chemical composition of steel and the combination of the two. Generally divided into martensitic stainless steel, ferritic stainless steel, austenitic stainless steel, duplex stainless steel and precipitation hardening stainless steel, or divided into two categories of chromium stainless steel and nickel stainless steel.steel tubing manufacturers
The so-called stainless steel sheet is the second process of recycling the scrap iron, lead, steel, etc., which is processed by removing the “Zi”. The traditional detection method is to use the magnet, which is indistinguishable by the traditional method. Naturally, it was the sky and the sea, and it covered a lot of engineering materials. Therefore, the land of the Tangbai Emperor entered one decoration site after another, and it was mounted on another luxurious curtain wall.
Identification from the mark: Many stainless steel products are stamped on the surface, such as: 13-0, 18-8, the number on the front of the short line indicates the chromium content of the product, and the number on the back of the short line indicates the nickel content in the product. Like 13-0, it only contains chromium without nickel, commonly known as “rust iron”; and 18-8 means that the product contains chromium and nickel, which is stainless steel. Negotiating from the sound: knocking on stainless steel or “stainless iron” products can also be used as a method of judgment. Attracted by permanent magnets: true stainless steel is not attracted to magnets, and “stainless iron” can be attracted to magnets. Although there is a difference in the properties of “rust iron” and stainless steel, it is significantly superior to wrought iron and cast iron cookware in terms of its rust resistance.