303 Stainless Steel
303 Stainless Steel is a non-magnetic, austenitic,a free-machining modification of the basic 10% chromium-8% nickel stainless steel specially designed to exhibit improved machinability while maintaining good mechanical and corrosion-resistant properties.
303 stainless steel is a stainless steel alloy. The main chemical composition of 303 stainless steel includes about 17-19% chromium, 8-10% nickel and a small amount of sulfur (usually 0.15%). The addition of sulfur helps improve processing performance.
The difference between 303 stainless steel and 304 stainless steel:
303 stainless steel and 304 stainless steel are two common stainless steel materials. They have some differences in chemical composition, mechanical properties and uses.
Chemical composition:
- 303 Stainless Steel: Contains approximately 17-19% chromium, 8-10% nickel, and 0.15% sulfur. The addition of sulfur improves processing properties, making it easier to cut and process.
- 304 Stainless Steel: Contains approximately 18-20% chromium and 8-10.5% nickel, no sulfur. 304 stainless steel is a general-purpose stainless steel suitable for a variety of applications.
|
Grade |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
Se |
|
|
303 |
min. max. |
– 0.15 |
– 2.00 |
– 1.00 |
– 0.20 |
0.15 – |
17.0 19.0 |
– |
8.0 10.0 |
– |
|
Grade |
C |
Si |
Mn |
P |
S |
Ni |
Cr |
Mo |
|
304 |
≤0.08 |
≤1.0 |
≤2.0 |
≤0.045 |
≤0.03 |
8.0-11.0 |
18.0-20.0 |
- |
Mechanical Properties
- 303 stainless steel: has good cutting performance and is suitable for manufacturing threads and other precision parts. But its intensity is relatively low.
- 304 stainless steel: It has high strength and corrosion resistance and is suitable for a wide range of uses, such as manufacturing kitchen utensils, chemical equipment, building materials, etc.
Corrosion resistance:
- 303 stainless steel: Compared with 304 stainless steel, 303 has poor corrosion resistance, especially in acidic environments.
- 304 Stainless Steel: Has good corrosion resistance and is suitable for many different environments, including acidic and alkaline conditions.
Application areas:
- 303 Stainless Steel: Mainly used for manufacturing parts that are easy to machine, such as bolts, nuts, shafts, etc., as well as applications that require an emphasis on processing performance rather than maximum corrosion resistance.
- 304 Stainless Steel: Used to manufacture products that require strength and corrosion resistance, such as kitchen utensils, building materials, chemical equipment, etc.
