The stainless steel plate has a smooth surface, high plasticity, toughness, and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions, and other media. It is an alloy steel that is not easy to rust, but it is not rust-free. Stainless plate refers to steel plate resistance to corrosion by weak media such as atmosphere, steam, and water, while acid-resistant steel plate refers to steel plate resistant to corrosion by chemically corrosive media such as acid, alkali, and salt. The stainless plate came out at the beginning of this century and has a history of more than 90 years.
Stainless Steel Plate has become a key material in industrial manufacturing and construction projects due to its excellent corrosion resistance, high strength, and wide range of applications. Whether in construction, marine, food processing, aerospace, or other industries, stainless steel sheets have shown significant advantages. This article will detail the definition, characteristics, common applications, and key factors in the selection of stainless steel plates, providing a comprehensive guide for customers who need to purchase stainless steel sheets.
What are Stainless Steel Plates?
Stainless steel plate is generally a general term for stainless plate and acid-resistant steel plate. Stainless plate refers to steel plate resistance to corrosion by weak media such as atmosphere, steam, and water, while acid-resistant stainless plate refers to steel sheet resistance to corrosion by chemically corrosive media such as acid, alkali, and salt. Since stainless sheets came out at the beginning of this century, the development of stainless plates has laid an important material and technical foundation for the development of modern industry and technological progress. There are many types of stainless plates with different properties, and they have gradually formed several categories during the development process.
According to the organization structure, it is divided into four categories: martensitic stainless plate (including precipitation hardening stainless steel plate), ferritic stainless plate, austenitic stainless plate, and austenitic plus ferritic duplex stainless steel plate. The chemical composition or some characteristic elements in the steel plate are classified into chromium stainless steel plates, chromium-nickel stainless steel plates, chromium-nickel molybdenum stainless steel plates, low carbon stainless plates, high molybdenum stainless steel plates, and high purity stainless steel plates.
According to the performance characteristics and use of the steel plate, it is divided into nitric acid-resistant stainless plate, sulfuric acid-resistant stainless plate, pitting corrosion-resistant stainless steel plate, stress corrosion-resistant stainless steel plate, high-strength stainless plate, etc. According to the functional characteristics of the steel plate, it is divided into low-temperature stainless plate, non-magnetic stainless steel plate, free-cutting stainless plate, superplastic stainless plate, and so on.
The commonly used classification method is based on the structural characteristics of the steel sheet and the chemical composition of the steel plate, as well as the combination of the two. Generally divided into martensitic stainless plate, ferritic stainless plate, austenitic stainless plate, duplex stainless steel sheet, precipitation hardening stainless plate, etc., or divided into chromium ss plate and nickel stainless plate.
It has a wide range of uses. Typical uses: heat exchangers for pulp and papermaking equipment, machinery and equipment, dyeing equipment, film washing equipment, pipelines, exterior materials for buildings in coastal areas, etc.
Stainless plates are divided into two types: hot rolled and cold rolled according to the manufacturing method, including thin cold plates with a thickness of 0.5.10-885 mm 72938 and medium-thick plates with a thickness of 4.5-100 mm.
It is required to withstand the corrosion of various acids such as oxalic acid, sulfuric acid-iron sulfate, nitric acid, nitric acid-hydrofluoric acid, sulfuric acid-copper sulfate, phosphoric acid, formic acid, acetic acid, etc. It is widely used in chemicals, food, medicine, papermaking, petroleum, atomic energy, etc. Industry, as well as various parts and components of construction, kitchenware, tableware, vehicles, and household appliances.
In order to ensure that the mechanical properties such as yield strength, tensile strength, elongation, and hardness of various stainless steel sheets meet the requirements, the steel plates must undergo annealing, solution treatment, aging treatment, and other heat treatments before delivery. 05.10 88.57.29.38 special symbols.
The corrosion resistance of stainless steel mainly depends on its alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal structure.
There are two types of hot rolling and cold rolling according to the manufacturing method. According to the structural characteristics of the steel, it is divided into 5 categories: austenite, austenite-ferrite, ferrite, martensite, and precipitation hardening.
The stainless steel sheet has a smooth surface, high plasticity, toughness, and mechanical strength, and is resistant to corrosion by acids, alkaline gases, solutions, and other media. It is an alloy steel that is not easy to rust, but it is not rust-free.
Corrosion Conditions of Stainless Steel Sheets
1. The surface of stainless steel has accumulated dust containing other metal elements or attachments of foreign metal particles. In humid air, the condensation between the attachments and stainless steel connects the two to form a micro battery, which initiates an electrochemical reaction. , The protective film is damaged, which is called electrochemical corrosion.
2. The surface of stainless steel adheres to the organic juice (such as melon, vegetable, noodle soup, sputum, etc.), which forms organic acid in the presence of water and oxygen, and the organic acid will corrode the metal surface for a long time.
3. The surface of stainless steel adheres to acid, alkali, and salt substances (such as alkaline water and lime water splashing on the decoration wall), causing local corrosion.
4. In polluted air (such as the atmosphere containing a large amount of sulfide, carbon oxide, and nitrogen oxide), contact with condensed water will form sulfuric acid, nitric acid, and acetic acid liquid spots, causing chemical corrosion. The above conditions can cause damage to the protective film on the stainless steel surface and cause rust.
Preservative
The corrosion resistance of stainless plates mainly depends on their alloy composition (chromium, nickel, titanium, silicon, aluminum, manganese, etc.) and internal structure, and the main role is chromium. Chromium has high chemical stability and can form a passivation film on the surface of the steel to isolate the metal from the outside world, protect the steel plate from oxidation, and increase the corrosion resistance of the steel plate. After the passivation film is destroyed, the corrosion resistance decreases.
The Identification Method
Number and Representation Method
①Use international chemical element symbols and national symbols to represent chemical components, and Arabic letters to represent component content: Such as China, Russia 12CrNi3A
②Use fixed-digit numbers to indicate steel series or numbers; such as the United States, Japan, 300 series, 400 series, 200 series;
③The serial number is composed of Latin letters and sequences, which only indicates the purpose.
China’s Numbering Rules
①Using element symbols
②Purpose, Chinese pinyin, open-hearth steel: P, boiling steel: F, killed steel: B, Class A steel: A, T8: Special 8, GCr15: Ball
◆Composite steel, spring steel, such as 20CrMnTi 60SiMn, (use a few ten thousandths to express the content of C)
◆Stainless steel, alloy tool steel (using a few thousandths to express the C content), such as 1Cr18Ni9 one-thousandth (that is 0.1%C), stainless C≤0.08% such as 0Cr18Ni9, ultra-low carbon C≤0.03% such as 0Cr17Ni13Mo
International Stainless Steel Marking Method
The American Iron and Steel Institute uses three digits to indicate various standard grades of forgeable stainless steel. in:
①Austenitic stainless steel is marked with 200 and 300 series numbers,
②Ferritic and martensitic stainless steels are represented by numbers in the 400 series. For example, some of the more common austenitic stainless steels are marked with 201, 304, 316, and 310,
③Ferritic stainless steel is marked with 430 and 446, and martensitic stainless steel is marked with 410, 420, and 440C. Remember, dual-phase (austenite-ferrite),
④Stainless steel, precipitation-hardening stainless steel, and high alloys with iron content of less than 50% usually use patent names or trademarks.
name.
Standard Classification
4-1 Classification:
①National standard GB
②Industry standard YB
③Local standard
④Enterprise standard Q/CB
4-2 Classification:
①Product standard
②Packaging standard
③Method standard ④Basic standard
4-3 Standard level (divided into three levels):
Y level: international advanced level I level: international general level H level: domestic advanced level
4-4 National Standard
GB1220-84 stainless steel bar (level I) GB4241-84 stainless steel welded plate (level H)
GB4356-84 Stainless Steel Welded Panel (Class I) GB1270-80 Stainless Steel Pipe (Class I)
GB12771-91 Stainless steel welded pipe (Grade Y) GB3280-84 Stainless steel cold plate (Grade I)
GB4237-84 stainless hot plate (level I) GB4239-91 stainless cold belt (level I)
Density
The density of 400″ series: 7.75
Density of 304, 321, 304L, 202, 201 7.93
310s, 309s, 316L, 316 density 7.98
How to Choose the Right Stainless Steel Plate for Your Project
The selection of stainless plates should consider the operating conditions, such as manual or automatic operation, the performance and type of the hot press, and the quality requirements of the pressed material such as hardness and gloss. We must also consider economic calculations. Each time a new steel plate is polished, it is required to produce a low-quality decorative plate.
In addition, when selecting the most reasonable thickness of the steel plate, the service time, quality, and rigidity should be considered, as the strength requirements of the plate under compression; thermal conductivity; pressure distribution, and the size of the press plate should be considered.
stainless steel plate, 430 stainless steel plate
If the thickness of the stainless plate is not enough, it is easy to bend, which will affect the production of decorative panels. If the thickness is too large, the steel plate is too heavy, which not only increases the cost of the steel plate but also brings unnecessary difficulties to the operation. At the same time, the margin that should be left when the stainless plate is processed or used must be considered. The thickness of the copper plate is not consistent, but the thickness of the same steel plate is as consistent as possible.
Generally, the thickness tolerance of the medium-sized saw plate is 0.05 to o.15 mm. If the requirements are too strict, the grinding costs will also increase. Generally, it is a steel plate with high tensile strength and high hardness. The greater the resistance to mechanical damage, the longer the durability of use, but the cost of grinding and processing is also higher.
Application Environment: If used in chemical or marine environments, it is recommended to choose 316 grade stainless steel sheets with higher corrosion resistance.
Temperature Requirements: For high-temperature applications, it is recommended to choose 310S or 316 stainless steel plates with good heat resistance.
Aesthetic Needs: For decorative applications, stainless steel plates with polished or brushed surfaces can be selected to improve the appearance quality.
Conclusion: Stainless Steel Plate – A Reliable and Versatile Choice
Stainless steel plates have become the material of choice for all walks of life around the world due to their corrosion resistance, high strength, and wide range of applications. Whether it is the construction, marine, or food industry, stainless plates provide reliable solutions. When choosing stainless plates, considering the right material and specifications can effectively extend the service life and reduce costs.
As a high-quality stainless steel plate supplier, we sincerely welcome global customers to consult us to learn about our diverse stainless steel plate products and competitive prices.