304 stainless steel, also known as 304 stainless steel (SUS 304), is the most popular stainless steel in the world. 304 stainless steel contains 18% Chromium and 8% Nickel. Therefore, this type of stainless steel has excellent anti-corrosion and anti-rust ability. So 304 stainless steel is applied in the industry: petroleum, food, pharmaceutical, textile dyeing,….
SUS 304, also known as INOX 304 or stainless steel, is an alloy of iron containing at least 10.5% chromium content.
Viewing: What is Sus 304
304 stainless steel is the most popular and popular type of stainless steel in the world today. 304 stainless steel accounts for 50% of stainless steel produced globally. And in Australia this figure ranges from 50% to 60% of stainless steel consumed. 304 stainless steel is used in most applications in all fields. You can see 304 stainless steel everywhere around your daily life such as: pots, pans, pots, spoons, forks, tables, chairs, decorations…
SUS steel grade has 2 types (304 L & 304H)
– Type 304L stainless steel is a type of stainless steel with low Carbon content (L symbol for Low, in English means low). 304L is used to avoid corrosion in important welds.
Type 304H stainless steel is a type with a higher Carbon content than 304L, used in places where higher durability is required.
Both 304L and 304H are available in sheet and tube form, but 304H is less commonly produced.
2. Chemical composition of stainless steel 304
Currently, we can easily see the applications of 304 stainless steel (stainless steel) in daily life as well as in production fields: construction, oil and gas, food, pharmaceuticals…and certainly the need The demand for 304 stainless steel will increase more and more. Below is a table of the chemical composition of 304 steel that stainless steel buyers should refer to and it is also the difference between stainless steel and other stainless steels.
Type C Si Mn P S Ni Cr 304 = = = = = 8 ∼ 10.5 18 ∼ 20 304H >0.08 = = = = 8 ∼ 10.5 18 ∼ 20 304L = = = = 9∼ 13.5 18 ∼ 20
304 stainless steel is one of the metal materials widely used in various fields of human life. Not only characterized by durability, rigidity and good resistance, stainless steel also brings a high aesthetic to the finished products. Please see the following outstanding features of 304 stainless steel:
3.1. Corrosion resistance of 304 stainless steel
304 stainless steel has shown its excellent corrosion resistance when exposed to many different chemicals. 304 stainless steel is rust resistant in most architectural applications, in most food processing environments and is easy to clean. In addition, 304 stainless steel also demonstrates its corrosion resistance in the textile industry and in most inorganic acids.
Stainless steel 304 exhibits good oxidation resistance at a temperature of 870 degrees Celsius, and continues to show up to 925 degrees Celsius In cases where high thermal resistance is required, a material with high content is required. higher carbon.
Figure 2. Heat resistance of stainless steel sus 304
For example: According to the AS1210 Pressure Vessels Code standard, the heat resistance of 304L is limited to 425 degrees Celsius, and it is forbidden to use 304 stainless steel with a carbon content of 0.04% or higher above a temperature of 550 degrees Celsius.
304 stainless steel exhibits excellent toughness when lowered to liquefied gas temperatures and applications at these temperatures have been found.
3.3.Mechanical and physical properties of 304 stainless steel
Like the steels in the Austenitic series, the magnetism of Type 304 is very weak and almost nonexistent. But after working in a low temperature environment, the magnetism is very strong (this goes against the process of quenching).
In addition, 304 stainless steel can only be hardened in low-temperature environments. The highest elastic stress that 304 stainless steel can achieve is 1000MPa, which is also influenced by factors such as the quantity and shape of the material.
I am the main method to produce 304 stainless steel. It will be heated up to 1010 degrees Celsius – 1120 degrees Celsius, and then cooled suddenly by dipping in cold water.
304 stainless steel has very good formability, it can be laminated without heating. This makes this Inox exclusive in the field of manufacturing stainless steel parts.
Figure 3. Machinability of stainless steel sus 304
For example: sinks, pans, pots … In addition, this property also makes 304 stainless steel applied as brake wire in industry and vehicles such as cars, motorcycles, bicycles…
304 stainless steel exhibits excellent weldability, this type of stainless steel is suitable for all welding techniques (except rock-wind welding). The cutting ability of Inox 304 is lower than that of Carbon steel, when processing this material on machine tools, it must require low rotational speed, large inertia, and the cutting tool must be hard, sharp and not forgot to use coolant
There are several grades of stainless steel with different physical properties. The magnetic properties of stainless steel are very dependent on the elements added to the alloy. A basic stainless steel with a “ferritic” and magnetic structure, formed from the addition of chromium – it can be hardened through the addition of carbon, making it “martensitic”. However, the most common stainless steel is “austenitic” – they have a higher chromium content and nickel is also added during machining. This is the nickel that changes the physical structure of the steel and makes it theoretically non-magnetic.
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304 stainless steel contains chromium (minimum 18%) and nickel (minimum 8%). It is an austenitic steel and is only slightly responsive to magnetic fields. It also contains 18 – 20% chromium and 8-10.50% nickel, and smaller amounts of several other elements.
316 stainless steel is a molybdenum alloy steel. The fact that it also reacts insignificantly to magnetic fields means that it can be used in applications where a non-magnetic metal is required. It also contains some other elements in different concentrations with different methods.
Is 304 stainless steel permanently rust-free? Absolutely not, in fact, rust or stains (light) can still cling to the edges or surfaces of products manufactured from SUS 304 stainless steel due to the habit of not regularly cleaning the product. However, simple cleaning will easily remove rust because 304 stainless steel has high corrosion resistance. As for stainless steel 201, when it is rusted, it will often be corroded, then even if it is cleaned or re-polished the product will still be corroded and the surface will not be as it was.
As we all know: stainless steel, also known as stainless steel, is a monolithic form of iron containing a minimum of 10.5% chromium. However, it is less prone to discoloration or corrosion like other common steel, with its durability and high ability in all weathers, so almost stainless steel is becoming more and more popular in Vietnam. However, stainless steel can still rust because it still has a composition of steel.
The main components of 304 stainless steel are the following contents: Fe, C ~ $ 0.08, Cr from 17.5-20%, Nickel from 8-11%, Mn
304 stainless steel is often used to create food processing equipment, especially in the beer industry, dairy processing and especially in making wine, screws, screws, bolts, and other stainless steel accessories.
With these features, many people choose stainless steel as the main raw material to create common products for daily life. 304 stainless steel is more popular than other types of stainless steel, not only in Vietnam but also in the whole world.
Stainless steel has the innate ability to form a passive layer to resist corrosion.
Chromium found in all stainless steels reacts rapidly with oxygen, like iron. However, the only difference is that a very fine layer of chromium will oxidize (usually only a few molecules in thickness). Unlike flacy and unstable iron oxide, chromium oxide is highly stable and non-reactive. It adheres to stainless steel surfaces and will not transfer or react with other materials. It also renews itself – if it is removed or damaged, more chromium will react with oxygen to replenish the barrier. The higher the chromium content, the faster the barrier will repair itself.
Once oxidized, or passivated, stainless steel typically rusts at a very low rate of less than 0.002 inches per year. When kept in top condition, stainless steel provides a clean and bright surface ideal for many building and landscape designs.
6.Application of 304 stainless steel
Stainless steel 304 (as well as stainless steel 201, stainless steel 316, stainless steel 430) uses nickel to maintain the austenitic composition at lower temperatures. Austenitic steels provide a balance of strength, practicability and corrosion resistance, making them ideal for outdoor architectural features, surgical instruments and food processing equipment.
A large amount of stainless steel produced today (especially 316 stainless steel) can be found in products related to the food and beverage industry. Stainless steel is commonly found in commercial kitchens and food processing plants because it serves many needs:
It can be easily formed and made into the shapes needed to manufacture a wide variety of equipment and machines, such as cooking tables, ventilation covers, storage tanks, and dischargers. It is available in a Wide range of decorative and polished finishes.
It can withstand the shock and abrasive conditions found in kitchens or food processing plants.
It can be cleaned easily and can withstand repeated washing with many of the chemicals and detergents used to meet public health needs.
It does not react with alkalis and acids in milk, cooked foods, vegetables, and food additives.
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The ultimate benefits of stainless steel include a long service life that will retain an attractive, clean finish. Proper care and cleaning of stainless steel has low maintenance costs.