When purchasing stainless steel toilets, we often need to consider which type of stainless steel to choose. Common stainless steel materials include 304 and 316. What are the differences between these two materials? Which material better suits our needs?
This article will compare 304 and 316 stainless steel to help you clarify your thinking and make an informed choice when purchasing stainless steel toilet.
What is 304 Stainless Steel?
304 stainless steel is the most common austenitic stainless steel, with its core components containing 18% chromium and 8% nickel, hence it is also known as 18/8 stainless steel.
It possesses good corrosion resistance, heat resistance, low-temperature strength, and mechanical properties; it has good hot workability such as stamping and bending, and its operating temperature ranges from -196℃ to 800℃. It is commonly used in food processing equipment, medical devices, chemical equipment, shipbuilding, and other fields.
What is 316 Stainless Steel?
316 stainless steel is also a molybdenum-containing austenitic stainless steel. Its core components include 16%-18% chromium, 10.0-14.0% nickel, and 2.0-3.0% molybdenum. The molybdenum significantly enhances its corrosion resistance and high-temperature strength, allowing it to withstand temperatures up to 1200-1300 degrees Celsius.
These corrosion-resistant and high-temperature-resistant characteristics make 316 stainless steel widely used in chemical and marine engineering applications.
The Difference Between 304 Stainless Steel And 316 Stainless Steel：
The main difference between 304 stainless steel and 316 stainless steel is that 2% -3% molybdenum is added to 316 stainless steel, The difference in composition determines the functional differences of stainless steel。
| Feature | 304 stainless steel | 316 stainless steel |
| Composition | 18% -20%Chromium, 8% -10%Nickel | 16%-18% Chromium, 10% -14%Nickel, 2-3% Molybdenum |
| Mechanical properties | Good ductility | High tensile strength and hardness |
| High-Temperature Performance | -196℃ to 800℃ | 1200-1300 ℃ |
| Corrosion Resistance | Excellent corrosion resistance in daily environments | Under harsh conditions, it will not corrode |
In addition, both 304 and 316 stainless steel have good resistance, wear resistance, and high compressive strength.
Both 316 and 304 stainless steel have excellent strength. 316 has higher hardness than 304, so 316 has better wear resistance. However, 304 has higher mechanical tensile strength than 316, so it is less prone to deformation
Both 304 and 316stainless steel are rust resistant and corrosion-resistant, but due to the presence of molybdenum in 316 stainless steel, it is more corrosion-resistant and durable when dealing with chlorides (such as seawater) and chemicals.
Cost Comparison
When deciding between purchasing 304 and 316 stainless steel, cost is a key consideration, and understanding their prices is essential for procurement personnel.
The different material compositions of 304 and 316 stainless steel inevitably lead to price differences.
316 stainless steel contains 2-3% molybdenum, an element more expensive than other elements, and also contains up to 14% nickel, resulting in a higher overall cost compared to 304 stainless steel.
Generally, 316 stainless steel is 30%-50% more expensive than 304 stainless steel.
Therefore, the choice must be made based on the specific needs of the project’s construction.
How to Choose
How to choose depends on the environment in which your project is located. If your project is indoors with low humidity and low corrosion, then 304 stainless steel is sufficient and an economical choice.
If your project designs chemicals for outdoor or high-intensity coastal environments, 316 stainless steel performs better and is more durable.
Taking stainless steel toilets as an example, they are commonly used in places with heavy traffic such as prisons, detention centers, correctional institutions, hospitals, sports centers, trains, and high-speed trains. These places have certain requirements for the safety and non-destructive performance of stainless steel toilets.
If it is indoors or in a normal environment, 304 stainless steel can meet the requirements. If it is in high traffic and high-risk environments, 316 stainless steel is more durable and safer.
Application Scenarios
The following scenarios are commonly applicable to 304 stainless steel toilet: f
prison： Prisons have high safety requirements for equipment, including anti destruction and anti suicide measures. 304 stainless steel toilet can meet these requirements
hospital： The hospital environment is quite oppressive, harsh, and has a very high flow of people, requiring the strength of stainless steel.
Sports Institute Hall：There is a high flow of people in the gym, and they sweat a lot, resulting in a high salt content. The toilet needs to be resistant to salt erosion
school：School students are lively and have strong destructive abilities, so the toilet needs to be sturdy and durable
The following scenarios are commonly applicable to 316 stainless steel toilet:
boat：The toilet on the ship needs to be resistant to seawater corrosion, and 316 stainless steel has stronger corrosion resistance
high-speed rail : The toilet on the high-speed rail needs to withstand high-speed movement, and the passenger flow on the high-speed rail is large, with many users
airplane: The toilet on the airplane needs to withstand the vibration caused by frequent takeoff and landing, and has high requirements for the strength of stainless steel
chemical plant: Chemicals have strong corrosiveness, and equipment must have high corrosion resistance
Summary:
304 and 316 stainless steel have similar chemical compositions and many common characteristics, but there are also significant differences.
In the fields of kitchen equipment, food processing, indoor bathroom, interior decoration, medical equipment, etc., both can be used interchangeably, and 304 stainless steel has lower cost and is more affordable. Therefore, choosing 304 stainless steel in these fields can meet the needs.
In high-strength, high hardness applications, or environments containing highly corrosive elements, 304 may corrode prematurely, while 316 is a better choice. 316 stainless steel has superior mechanical strength, oxidation resistance, and corrosion resistance.
FAQ
Why is 316 Stainless Steel More Expensive than 304
316 stainless steel is expensive because it contains 2% -3% more molybdenum, which is relatively rare and has high smelting costs; 316 stainless steel also contains a relatively high nickel content, and the price of nickel is relatively high, so the overall cost of 316 is higher than that of 304.
Why is 304 Called Food Grade Stainless Steel
304 is known as food grade stainless steel because it has excellent corrosion resistance and does not rust or release harmful substances to contaminate food under normal conditions. It can meet food contact safety standards, which ordinary steel cannot achieve.
Moreover, the price of 304 stainless steel is moderate and it is often used in food processing equipment. With its widespread use, it has gained the popular name “food grade stainless steel”.
Why is 316 Called Marine Grade Stainless Steel
The reason why 316 marine stainless steel is named is because it has chlorine corrosion resistance compared to other grades of stainless steel. Marine grade stainless steel contains 2% -3% molybdenum, an extremely hard metallic element used to enhance material toughness and corrosion resistance. It is a high-end choice for dealing with harsh or continuously humid environments
