What is the maintenance of stainless steel stainless steel building materials

In layman's terms, stainless steel is a steel that does not easily rust. In fact, a part of stainless steel has both stainless and acid resistance (corrosion resistance). The stainless steel's stainless and corrosion resistance is due to the formation of a chromium-rich oxide film on its surface. This stainless steel and corrosion resistance are relative. Tests have shown that the corrosion resistance of steel in weak media such as air and water and in oxidizing media such as nitric acid increases with the increase of chromium content in the steel. When the chromium content reaches a certain percentage, the corrosion resistance of steel undergoes abrupt changes. , that is, from rust to rust, from corrosion resistance to corrosion. Then the following will introduce to you what is the maintenance of stainless steel and stainless steel building materials .

一、Introduction of stainless steel

All metals react with oxygen in the atmosphere to form an oxide film on the surface. Unfortunately, the iron oxide formed on ordinary carbon steel continues to oxidize, causing the rust to continuously expand, eventually forming holes. The carbon steel surface can be protected by plating with paint or oxidation-resistant metals (for example, zinc, nickel and chromium), but, as is known, this protection is only a thin film. If the protective layer is destroyed, the underlying steel begins to rust.

Chromium is an essential element for obtaining corrosion resistance of stainless steel. When the chromium content in the steel reaches approximately 12%, chromium acts on oxygen in the corrosive medium to form a very thin oxide film on the surface of the steel (self-passivation film). , can prevent further corrosion of the steel substrate. In addition to chromium, the commonly used alloying elements are nickel, molybdenum, titanium, niobium, copper, nitrogen, etc., to meet the various requirements of the stainless steel structure and performance requirements.

Stainless steel is usually divided into matrix structures:

1, ferritic stainless steel. Chromium 12% to 30%. Its corrosion resistance, toughness and weldability increase with the increase of chromium content, and its resistance to chloride stress corrosion is superior to other types of stainless steel.

2, austenitic stainless steel. Chromium is more than 18%, also contains about 8% nickel and a small amount of molybdenum, titanium, nitrogen and other elements. Good overall performance, resistant to many media corrosion.

3, austenitic - ferritic duplex stainless steel. It combines the advantages of austenitic and ferritic stainless steels and has superplasticity.

4, martensitic stainless steel. High strength but poor plasticity and weldability.

Second, stainless steel history

From 1820 to 1900, very little is written about the progress of stainless steel.

In 1932 the hot rolled strip was successful. Stainless steel flagpole

In 1934, the stainless steel sheet was successfully developed. Stainless steel is a synthetic steel with iron as its main component. It has excellent corrosion resistance and is not easily rusted.

In the early 1820s, the British scientist Faraday invented and created the first step in the birth of stainless steel. This is a method of adding a few percent of chromium to iron to enhance the corrosion resistance of iron and synthetic steel that does not easily rust. However, the practical application of "stainless steel" was carried out for decades afterwards. After many studies by many scientists, improvements were made to the current stainless steel.

Third, the role of stainless steel

Stainless steel does not produce corrosion, pitting, rust, or wear. Stainless steel is also one of the strongest materials in construction metal materials. Because stainless steel has good corrosion resistance, it can make structural components permanently maintain the integrity of the engineering design. Chromium-containing stainless steel also combines mechanical strength and high extensibility, making it easy to manufacture parts that meet the needs of architects and structural designers.

How to maintain the stainless steel building materials

1.Stainless steel surface dust and easy to remove the dirt can be washed with soap, weak detergent or warm water.

2. The trademark and film on the surface of stainless steel are washed with warm water and weak detergent, and the adhesive component is scrubbed with alcohol or organic solvents (ether, benzene).

3. Contaminate the grease, oil, and lubricating oil on the surface of stainless steel, wipe it off with a soft cloth, and then clean it with a neutral detergent or ammonia solution or with a special detergent.

4. The surface of stainless steel is bleached and adhered to various acids. Rinse immediately with water, then dip in ammonia solution or neutral carbonated soda solution, and wash with neutral detergent or warm water.

5. The rainbow stain on the surface of stainless steel is caused by excessive use of detergent or oil. It can be washed with warm aqueous detergent.

6. The rust on the surface of stainless steel can be washed with 10% nitric acid or grinding detergent. It can also be washed with special washing chemicals.

A, product maintenance

When stainless steel is used as a building material, it must be protected from processing damage. In general, all stainless steel surfaces are covered with plastic films for protection. When the manufacturer ships the product, it also adds a surface protective film for the purpose of use. These films can be easily peeled off, and the surface of the product must not leave a paste mark.

When the final product is bundled, the protective film is not torn as far as possible. For these protected products, it is best processed on a soft gantry such as a wooden stand.

B. On-site maintenance

When the processed product is shipped to the site, it must first be bundled. Bales are generally implemented in workshops. Depending on the size, shape and delivery methods of the products, protective measures such as cardboard and plastic plates are used, and wooden frames are used.

In terms of transportation, trucks are generally used for direct transportation in order to ensure the installation time and prevent damage to the products. Moreover, at the installation site, the protection of the products after the installation is completed and the protection against contamination during the installation are also required.

The cause of damage on the site is falling objects falling from the upper floors, sparks from electric welding, etc. In summary, there are various different damage factors depending on the site. Therefore, most of them are covered with plastic films and other external surfaces, side parts, etc.

Editor's summary: The relevant information on what is stainless steel, stainless steel building materials maintenance is introduced here for everyone, I hope this article helps everyone. If you still have something you don't understand, you can leave a message to Xiaobian at the bottom. We will answer your questions as soon as possible.

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