Stainless Steel

The main function of chromium is to form a dense oxide film to prevent oxygen and moisture from corroding the metal surface, thereby playing an anti-corrosion role. In addition, the addition of nickel can improve the corrosion resistance and plasticity of stainless steel.

The corrosion resistance of stainless steel decreases with the increase of carbon content. Therefore, the carbon content of most stainless steels is low, not exceeding 1.2% at most. The Wc (carbon content) of some steels is even lower than 0.03% (such as 00Cr12).

The main alloying element in stainless steel is Cr (chromium). Only when the Cr content reaches a certain value, the steel will be corrosion-resistant. Therefore, the Cr (chromium) content of stainless steel is generally at least 10.5%. It also contains Ni, Ti, Mn, N, Nb, Mo, Si, Cu and other elements.

As the chromium content in steel increases, the corrosion resistance of steel increases. When the chromium content reaches a certain proportion, a very thin, colorless, transparent, smooth chromium-rich oxide film will automatically form on the steel surface to prevent the steel from rusting. This film is very stable and will quickly repair itself even if it is damaged. It is called a self-passivating film.

The corrosion resistance of stainless steel depends on the alloying elements contained in the steel, and chromium is the basic element that makes stainless steel corrosion-resistant. In addition to chromium, commonly used alloying elements include nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the requirements of stainless steel organization and performance for various uses.

It is a kind of material with a brightness close to that of a mirror, and a hard and cold touch. It is a relatively avant-garde decorative material with excellent heat resistance, weldability, corrosion resistance, compatibility, and toughness.

Different products have different requirements for welding performance. Class I tableware generally does not require welding performance, even for some pot companies. However, most products require good welding performance of raw materials, such as Class II tableware, thermos cups, steel pipes, water heaters, water dispensers, etc.

The corrosion resistance of stainless steel generally increases with the increase of chromium content. The basic principle is that when there is enough chromium in the steel, a very thin and dense oxide film is formed on the surface of the steel, which can prevent further oxidation.

Nowadays, in the production process of stainless steel products, polishing is a process that must be carried out, so this requires raw materials with better polishing performance.

The heat resistance of stainless steel mainly refers to the ability of stainless steel to maintain excellent physical and mechanical energy at high temperatures. Carbon is an interstitial element that can significantly improve the strength of austenitic stainless steel through solid solution strengthening. Carbon can also improve the stress resistance and corrosion resistance of austenitic stainless steel in high-concentration chlorides. Therefore, using carbon as a raw material for stainless steel pipes can improve the heat resistance of stainless steel.

Because of the unique characteristics and diverse classification of stainless steel, it is widely used in various fields. The following are several typical application fields:

In the chemical, petroleum, energy and other industries, stainless steel is often used to manufacture containers, pipes, heat exchangers and other equipment to withstand high temperature, high pressure and corrosive media.

Stainless steel has good weather resistance and aesthetics, and is widely used in architectural decoration, interior decoration, and structural materials such as bridges and columns.

Food-grade stainless steel materials meet hygiene standards and are widely used in food processing equipment, food storage containers, etc. to ensure food safety and hygiene.

Stainless steel has antibacterial properties and biocompatibility, and is widely used in the manufacture of medical devices, surgical instruments, artificial joints, etc., to improve the reliability and durability of medical equipment.

As an important material, stainless steel has the characteristics of corrosion resistance, aesthetics and good mechanical properties, and is widely used in many fields. When choosing stainless steel materials, Wanzhi Company is a reliable partner, providing stainless steel materials of various specifications and models to provide customers with a full range of solutions.