Stainless steel in life can be seen everywhere, and there are different models, which are not clear.Today, I will share an article with you to clarify the knowledge points.

Stainless steel (stainless steel) is the abbreviation of stainless acid resistant steel.Corrosive steel species of chemical corrosion media (chemical engraving such as acid, alkali, salt, etc.) are called acid -resistant steel.Stainless steel refers to steel, steam, water and other low corrosive mediums and steel corrosive steel such as acid, alkali and salt, also known under the name of stainless steel and acidic.In practical applications, corrosive steel with low corrosive environments is often called stainless steel, and steel that corrodes chemical resistance is called acid -resistant steel.Due to the differences in chemical composition, the first does not necessarily resist the corrosion of the chemical environment, while the second is generally stainless.The corrosion resistance of stainless steel depends on the alloy elements contained in steel.

Common classification:Usually, the organization in the golden phase is divided into:Generally, in accordance with the golden phase, ordinary stainless steel is divided into three categories: Austrian stainless steel, ferrite stainless steel and Malian stainless steel.On the basis of these three types of basic cashier organizations, for specific needs and purposes, in double phase steel, in precipitated hardening steel and steel with high alloy with an iron content of less than 50% .1. Austrian stainless steel.The matrix is ​​mainly based on the austenitic fabric (CY) of the Cubic Cubic Face structure.The American Iron and Steel Association is marked with the number of 200 and 300 series, like 304.

2, stainless steel of the iron body.The matrix is ​​mainly based on the Cubic crystalline structure in the heart of the body (a phase).The American Iron and Steel Association is marked with 430 and 446.

3. Maj’s innelesdled Steel.The matrix is ​​a fabric of martensite (cube or cube), which is made of magnetic and stainless steel which can adjust its mechanical properties by thermal treatment.The American Iron and Steel Association is marked with 410, 420 and 440.At high temperatures, the austenitic fabric of the workshop is at high temperature.4. ASSENITE (two phases) in stainless steel.The matrix has both auscopic tissue and ferrite.Compared to austenitic stainless steel, the resistance of steel to two phases is high, the resistance to corrosion and resistance to chlorine from resistance to chloride and punctual corrosion have improved considerably.

5. Prepare the stainless steel with rigid blanket.The matrix is ​​auscoplasm or with a martensite fabric, and stainless steel can be hardened by a precipitated treatment.The American Iron and Steel Association is marked with a 600 series, like 630, that is to say 17-4ph.In general, in addition to alloys, the corrosion resistance of Austeen stainless steel is excellent. Hardness, stainless steel with martensite and precipitated stainless steel can be used.Characteristics and use

Thickness1. During the steel plant rolling process, the rolls are slightly deformed by heat, which deflects the thickness of the rolled plate.When the thickness of the board is measured, the condition stipulates that the median part of the head of the map must be measured.

2. The reason for tolerance is based on market needs and customers, which are generally divided into Dagong and small tolerances:For example

What type of stainless steel is not easy to rust?

There are three main factors affecting stainless steel rust:

1. The content of the alloy elements.In general, the chrome content is not easy to rust when 10.5% steel.The higher the content of chrome nickel, the better.

2. The manufacturers’ merger process will also affect the corrosion resistance of stainless steel.Stainless steel mills with good fusion technology, advanced equipment and advanced know-how can be guaranteed in terms of control of alloy elements, the elimination of impurities and the control temperature control of the billette . Reliable, with good interior quality and not easy to rust.Conversely, a few small steel equipment is back and back.

3. The external environment, the environment where the climate is dry and ventilated is not easy to rust.Air humidity is large and it is easy to rust in environmental areas with continuous rainy weather or environmental areas with large and alkaline.304 in stainless steel, if the surrounding environment is too poor, it rusts.

How to manage stainless steel?

1. Chemical methodUse an acid cream or spray to help its rusty pieces to reappear or a passivation to form an oxide of chrome to restore corrosion resistance. appropriate rinsing.After all the treatment, use the polishing equipment to be polished again and close it with polishing wax.It can also be used by those who have a slight rust point for local rust stains:1 The liquid mixed with petrol and oil can be wiped with a clean cloth to remove rust spots.

2. Mechanical methodClean sandy and use glass or ceramic particles to be cleaned, destroyed, brushed and polishing.It is possible to wipe the pollution caused by the materials, the polishing materials or the materials previously destroyed.All kinds of pollution, in particular foreign iron particles, can become a source of corrosion, especially in a wet environment.Therefore, the surface of the mechanical cleaning should be properly cleaned under dry conditions.The use of mechanical methods cannot clean its surface and cannot modify the resistance to the corrosion of the material itself.Therefore, it is recommended to remove the polishing equipment after mechanical cleaning and close it with polishing.

Graphics and performance in stainless steel commonly used in meters

1. 304 in stainless steel.It is one of the austenite stainless steel with a large amount of application and the most used range.

2. 304L in stainless steel.In order to solve stainless steel with Ultra-Low-Carbon Austenesta developed by 304 stainless steel which developed by 304 in stainless steel under certain conditions.With the exception of slightly low resistance, other performances are the same as 321 in stainless steel, which are mainly used for equipment and components resistant to corrosion which cannot be soluble after welding, and can be used to make various instrumental bodies.

3. 304h in stainless steel.The internal support of 304 in stainless steel has a carbon mass score from 0.04% to 0.10%, and high temperature performance is better than 304 in stainless steel.

4, 316 in stainless steel.Add the molybdenum on the basis of steel 10CR18ni12, so that steel has a good medium and punctual corrosion capacity.In seawater and other environments, corrosion resistance is better than 304 in stainless steel, which is mainly used for engraving materials.

5, 316L in stainless steel.Ultra-up-carbone steel has a good corrosion performance of a good awareness crystal, is suitable for welding parts and equipment that make a thick section size, such as materials resistant to corrosion in petrochemical equipment.

6. 316h in stainless steel.The internal support for 316 stainless steel has a 0.04% carbon mass score to 0.10%, and high temperature performance is better than 316 in stainless steel.

7, 317 in stainless steel.Extract resistance and fluting resistance is better than 316L stainless steel, which is used to manufacture petrochemical and organic corrosion equipment.

8, 321 in stainless steel.Stabilized titanium stainless stainless steel adds titanium to improve corrosion resistance from crystal resistance and has good mechanical properties at high temperature.With the exception of special occasions such as high temperature or corrosion of hydrogen, it is generally not recommended.

9, 347 in stainless steel.奥 L’acier inoxydable stable Austeenian, ajoutez 铌 铌 铌 pour améliorer les performances de corrosion de la résistance aux cristaux. Mainly used in fields of thermal power and petrochemicals, such as the manufacture of containers, pipes, heat exchangers, trees, furnace tubes in industrial ovens and thermometers of oven tubes.

10, 904L in stainless steel.Super entirely in Austeen stainless steel, is a super austean stainless steel invented by Outokumpu, Finland. Resistance in non-oxidized acids such as sulfuric acid, acetic acid, methodal acid and phosphoric acid, while having good properties of anti-gap corrosion and antiplication corrosion.It is suitable for various concentrations of sulfuric acid lower than 70 ° C. It is also very good to resist with any concentration, any temperature and any temperature and hybrid acid of methods and acetic acid.ASMESB-625 standard of origin will belong to the nickel alloy, and the new standards are attributed to stainless steel.China has an almost 015cr19ni26Mo5cu2 steel number. stainless steel.11, 440C in stainless steel.Martin in stainless steel, the highest hardness in hard stainless steel, stainless steel and HRC57.It is mainly used to make nozzles, bearings, valves, valves, valves, sleeves and valve rods.

12, 17-4PH in stainless steel.Martine precipitates hardening steel hardening with HRC44 hardness, which has resistance, hardness and high corrosion resistance, and cannot be used for temperatures above 300 ° C.It has good corrosion resistance to atmospheric acid and diluted salt.

在仪表专业中 ， 结合通用性及成本问题 ， 常规的奥氏体不锈钢选择顺序是 304-304l-316-316l-317-321-347-904l 不锈钢 ， 其中 317 较少用 较少用 321 不推荐 ， 347 用At high anti-corrosion temperature, 904L is only the default material of certain components of individual manufacturers.In the selection of the instrument design, the meter material is generally different from the different occasions of the pipeline material, in particular in industrial conditions at high temperature. Treatment equipment or pipeline, such as pipelines, such as pipelines for high temperature chrome steel, and the instrument chooses stainless steel. .

In the selection of the design of the instruments, stainless steel with various systems, series and marks often encounter various perspectives such as the specific process medium, temperature, pressure, constraint components, corrosion and costs as a function of the specific process environment.