304 Stainless Steel,also known as 18/8 (18% chromium 8% nickel) stainless steel,is the most widely used of all Stainless Steel types,widely used in industry, construction, furniture decoration, food and medical industries. 304 ss yield strength is one of its important mechanical performance indicators.In this blog,we will show the yield strength of stainless steel 304 and its properties under different conditions in detail.
304 Stainless Steel
Type 304 is the most versatile and widely used stainless steel,also known as AISI 304 or S30400, is a typical austenitic chromium-nickel stainless steel containing chromium (18%) and nickel (8%), which is also called "18-8" stainless steel. 304 steel also contains a small amount of carbon, manganese, silicon, phosphorus, sulfur and other elements. It has excellent corrosion resistance and processing performance and is widely used in food processing equipment, chemical equipment, building materials and household products.
Chemical Composition of 304
|
% |
C |
Mn |
Si |
P |
S |
Cr |
Mo |
Ni |
N |
|
Min |
|
|
|
|
|
18.0 |
|
8.0 |
|
|
Max |
0.08 |
2.0 |
0.75 |
0.045 |
0.030 |
20.0 |
|
10.5 |
0.10 |
304 SS Yield Strength
The yield strength of 304 stainless steel will be affected by the material processing method, heat treatment process, and product form (such as sheets, bars, pipes, etc.).Generally, 304 yield strength ranges from 205 MPa to 260 MPa.
| Form | Conditions | Yield Strength,MPa |
|
Sheet |
Annealed | 205-215 |
| Plate | Annealed | 200-210 |
| Bar | Annealed | 205-215 |
| Pipe | Annealed | 190-205 |
Stainless Steel 304 Yield Strength under different conditions:
- The yield strength at the 0.2% offset is 215 MPa.
- In the annealed condition,304 stainless steel has a lower yield strength, usually between 200 and 300 MPa.
- Under certain specific conditions, the yield strength can reach 240 MPa.
304 SS Physical Properties |
Metric | English | Comments |
| Density | 8 g/cc | 0.289 lb/in³ | |
304 Stainless Steel Mechanical Properties |
|||
| Hardness, Brinell | 123 | 123 | Converted from Rockwell B hardness. |
| Hardness, Knoop | 138 | 138 | Converted from Rockwell B hardness. |
| Hardness, Rockwell B | 70 | 70 | |
| Hardness, Vickers | 129 | 129 | Converted from Rockwell B hardness. |
| Tensile Strength, Ultimate | 505 MPa | 73200 psi | |
| Tensile Strength, Yield | 215 MPa | 31200 psi | at 0.2% offset |
| Elongation at Break | 70 % | 70 % | in 50 mm |
| Modulus of Elasticity | 193 - 200 GPa | 28000 - 29000 ksi | |
| Poisson's Ratio | 0.29 | 0.29 | |
| Charpy Impact | 325 J | 240 ft-lb | |
| Shear Modulus | 86 GPa | 12500 ksi | |
Factors affecting the 304 yield strength
1.Heat Treatment
Annealed 304 stainless steel can reduce internal stress and restore the 304 material to a softer state, reducing its yield strength to about 205 MPa. Thus, the heat treatment process significantly affects the yield strength of 304 stainless steel.
2.Stress corrosion
304 stainless steel may suffer from stress corrosion cracking in certain environments, especially when it contains chloride ions. This corrosion phenomenon reduces the effective yield strength of 304 steel and affects its service life.
3.Manufacturing process
Different manufacturing processes can also affect the yield strength. For example, the cold rolling process can increase the yield strength of the material.
4.Temperature
Temperature changes can also affect the yield strength. Under high temperature conditions, the yield strength of the material may decrease.
Disclaimer: Many things here represent our opinion. Others are information from the Internet. We can therefore never claim to be correct or complete. And never base a business decision solely on the news you receive from us.
