Everything you need to know about SUS SS304
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SS304: Grade, Variation, and Application
The SS30Ultimate FAQ Guide
Stainless steel is widely used in several industries, from construction to food preparation. It is because of its great durability, anti-corrosion property, and workability as a material. However, did you know that there are different grades of stainless steel? One of the stainless steel grades that are usually used in various industries is SUS 304.
Stainless steel consists of different alloys like chromium, silicon, carbon, nickel, and so on. Depending on the composition, you can find different kinds of steel classified according to various grades.
Grade defines the stainless steel depending on what alloy it has, the quantity of alloy, its strength, properties, and so on. Thanks to that, people can find stainless steel that is suited for their needs.
If you are interested to know where to use SUS 304 and its properties, read on. All the information you will need is listed down here.
How do I know the grade between grade 304 or 202 in stainless steel?
SS304 vs SS316
Elements of alloy
Problems of food quality
The material content of ss304 met the grade of food according to the material. The market is from three types of standard quality food materials: 304, 316, and 430. Grade 304 stainless steel is usually in use with our kitchen appliances or water cups, some 316 with medical equipment, and some 430 with stainless steel cutting tools.
However, a definition must also be in clarification here. The substance is not the quality of food. It also requires whether the production and other ties meet the quality of foodstuffs.
Resistant to corrosion
The 304 ss is from the addition of some more molybdenum to the pitting resistance. The resistance to corrosion of 304 stainless steel and 316 stainless steel is almost identical in different water quality forms like distilling water, drinking water, river water, boiler water. However, if the medium's chloride ion content is very great, 316 stainless steel is better suited.
Cost: ss304 vs ss316
Molybdenum and added nickel added to 316 are more pricy than ss304 stainless steel.
Low carbon issue: ss304 vs ss316
The carbon content of ss304L and 316L is lower than that of ss304 and 316. Also, there is a clear comparison in the material content table. Stainless steel rust is mainly information on the chromium-rich oxide film's surface, but when the temperature is too high, intergranular corrosion will occur.
Therefore, less carbon content thus decreases intergranular corrosion in ss304L and 316L. Increased vulnerability to integrated corrosion does not imply a higher susceptible non-low carbon content to corrosion but even in high chlorine environments.
The following pages will introduce the basic roles and scope of use of all stainless steel materials. Rational use of their advantages and drawbacks would give us more benefit.
What do you have to do with grades ss304 vs ss316?
Here are some cases in which the best option can be ss304 stainless steel:
1. The application demands outstanding formability.
2. The higher content of molybdenum in Grade 316 can adversely affect formability.
3. The request has reservations about prices.
In short, it is necessary to carefully compare ss304 vs ss316.
How does the 304 grade of stainless steel vary from the AISI 304 grade?
The ss304 is a guideline only and does not provide the physical properties minimum or maximum values. If in the test according to the specification, the ss304 applies to the various ASTM, BS, etc. standards depending on the type of material being in evaluation. For example, such as 304 ss plates obey a different ASTM standard and vary in physical demands, while the ASTM standard will be in test on the SS304 rods with a different physical value. There are identical chemical compositions.
How do I stop SS304 rust following MIG welding?
The following methods can be in use for deep skin corrosion:
How do you recognize products like copper and brass materials SS304 and SS316L?
How do we modify if we use SS304 in sheet metal work instead of stainless steel?
The SS304 stainless steel offers outstanding corrosion strength due to the heavy chromium and nickel concentrations. ss304 stainless steel popular applications include:
Refrigerator and washing machines such as appliances
Commercial machines for food processing
Exchangers of heat
Structures that corrode regular carbon steel in environments
What Does SUS 304 Stainless Steel Mean?
The SUS 304 is a Japanese standard JIS stainless steel. The "SUS" designation means the material uses stainless steel. This steel is almost the same as other 304 stainless steel. The only difference is that it's a standard grade employed in Japan.
It is a widely used stainless steel for chemical plants, paper making industry, vehicles, and kitchenware. This stainless steel consists of 18% chromium, 0.042% carbon, 0.004% Sulfur, 8% Nickel, and other material in minute quantities.
It has great corrosion resistance so that it won't get damaged easily. This grade can also keep its strength and heat resistance in high and low temperatures. Besides that, it has great weldability, mechanical properties, and cold workability.
How To Identify SUS 304 Stainless Steel?
SUS 304 composition is almost the same as other 304 stainless steel. However, there is still some difference. To know more about it, please read on.
1. Internal Structure
The SUS 304 stainless steel is a Chromium-nickel austenitic alloy since it has 18% chromium and 8% nickel. Austenitic structure stainless steel can easily retain its original structure even if the temperature is very low. Besides that, it will also have a high strength value, high-temperature resistance, and resistance to heavy load.
2. Corrosion Resistance
One of the SUS 304 stainless steel advantages over others is its great corrosion resistance in any atmosphere. It has chromium that helps protect it from getting rust, while nickel makes sure that it won't get easily corrupted.
However, in a warm chloride environment, above 60 degrees celsius, this grade will easily get pitting, stresses, and crevice corrosion. It can resist corrosion from water with 200 mg of chloride per liter at room temperature.
3. Physical Properties
For its physical properties, its density is 7.93, the same as other 304 stainless steel in the market. It has a melting point of 1,400 to 1,450 degrees Celsius and has 193 GPa of elastic modulus. For its electrical resistivity, its value is around 0.73. At the same time, its thermal expansion value is 16.3 (20-100°C), 17.8 (20-300℃), 18.4 (20-500℃). Lastly, the thermal conductivity value is 16.8 (100°C), which is relatively low compared with other steel grades.
4. Mechanical Properties
The SUS304 stainless steel has a yield strength of ≥ 205 while its tensile strength is ≥ 520. At the same time, the elongation value is 40%. For the hardness, its Brinell hardness value is ≥ 187, while its HV hardness value is ≥ 200. These properties denote that this material is good for many industrial and medical applications.
Its weldability is also excellent, so employing it using the usual technique is no problem. Unlike other 304 grades, SUS 304 has high toughness, so it won't easily crack at very high heat or cold temperature. However, it can contain intergranular corrosion, especially if big parts are welded together in a chlorine-containing medium.
Industries define the workability of stainless steel as its ability to be transformed using various metal-working processes without forming cracks. In this regard, SUS 304 is one of the most used steel due to its outstanding workability.
Due to its toughness coupled with great weldability, it can withstand various fusion techniques without using filler metals. Manufacturers can also subject this steel grade to different metal processes in high or low temperatures, which only a few stainless steel grades can do without breaking.
Moreover, the workability and the strength of this stainless steel also increases in cold working or cryogenic processes. This feature is due to the occurrence of induced martensite in its composition and work hardening of austenite.
Additionally, industries know the SUS 304 as a model stainless steel for other grade material due to its ability to withstand cold working conditions. Other steel grades do not have this feature since they are fragile and susceptible to cracks in cryogenic environments.
7. Heat Treatment
Stainless steel usually undergoes heat treatment based on the need and steel type. Manufacturers do this to increase corrosion resistance and add strength and elasticity. Some of the heat treatment processes include hardening, stress relief annealing and are conducted during fabrication.
Industries do the heat treatment to produce hard stainless steel that can withstand abrasion stress and other physical stress. It is conducted under controlled conditions to prevent scaling, carburization, and decarburization.
For SUS 304, manufacturers apply heat treatment to achieve the highest corrosion resistance of this material. Manufacturers do this to ensure that the carbide will be fully dissolved and maintained at room temperature, resulting in a single-phase austenite composition.
The solution treatment for the heating treatment of SUS 304 is relatively high, ranging between 1050-1100 ℃. Manufacturers can adjust the temperature from time to time according to the monitored carbon content. Manufacturers also carefully subject the 304 steel to the preheating process before undergoing any heating and quenching process. This part is important since SUS 304 has a relatively low thermal conductivity.
Additionally, careful consideration is given for the holding time of the heating solution. The solution treatment usually undergoes a long holding time to avoid carburization. This technique is crucial to lowering the susceptibility of SUS 304 to intergranular corrosion.
After the heating treatment, the SUS 304 undergoes stress relief annealing at a lower temperature. Finally, the stainless steel will then undergo a stabilization process to complete the heat treatment method.
What Are the Applications of SUS 304 Stainless Steel?
You will see the SUS 304 used in most industrial applications. Industries use it in chemical plants, paper making industry, vehicles, kitchenware, and many more. Besides that, experts also use it for surgical instruments, decorations, electronic products, and machinery parts.
What's the Difference Between SUS 304 and 304 Stainless Steel?
If you are going to check the two stainless steel grade compositions, you will see that it's almost the same. The discrepancy of the alloy's quantity used in each grade is very little or the same. Even its physical properties are almost identical. The only thing that differs between the two grades is that the SUS 304 is a Japanese standard steel grade.
Is This Medical Grade?
304 stainless steel is medical-grade since it has anti-corrosive property. Industries commonly use it in surgical instruments, but it's not as good as other stainless steel grades like 316. Stainless steel grade 316 has molybdenum, which heightens its corrosive property better than 304. Its molybdenum features also help in resisting corrosion when it is exposed to saline solutions or chlorine.
SUS 304 stainless steel doesn't have molybdenum, so it can easily rust when exposed to chlorine and saline. However, this grade still has great weldability and properties that is why its uses in other applications. Industry experts still use this in medicine but in applications where it won't be exposed to acids or chlorine.
Is SUS 304 Stainless Steel Magnetic?
All austenitic steel is not magnetic since it has high chromium and nickel content like the 300 series. However, after it has undergone cold working like SUS 304, it can be slightly magnetic.
Are 18/8 And SUS 304 The Same?
The term 18/8 is used to designate stainless steel based on its composition. Specifically, its chromium quantity is 18%, while its nickel is 8%. Hence the name 18/8. However, 18/8 steel grade is another form of 304 stainless steel. They are sometimes called interchangeably due to their similarities in physical, mechanical, and corrosive resistance.
Unlike other metals, industry experts commonly use stainless steel because of its advantages. It also has different grades that help people know which one to use depending on what they want to do. You will find the SUS 304 here, including its properties, strength, and applications. Hopefully, the information you will find here about SUS 304 can help with the application you want to do.
If you have any more questions or concerns about SUS 304, please check it to the nearest stainless steel manufacturer in your area.