ASTM A632 TP304 TP304L TP310 TP316 TP316L Stainless Steel Tube
Seamless Austenitic Stainless Steel Tubing for Medical Applications
Material
ASTM A632 specifies the requirements for seamless austenitic stainless steel tubing. This type of tubing is widely used in various industries, particularly in medical applications due to its excellent corrosion resistance, high strength, and good formability.
Specification
The ASTM A632 standard covers several grades of stainless steel tubing, including TP304, TP304L, TP310, TP316, and TP316L. Each grade has specific properties that make it suitable for different applications.
Key Features
- Corrosion Resistance: Excellent resistance to a wide range of corrosive environments.
- High Strength: Provides good mechanical properties at both room and elevated temperatures.
- Formability: Can be easily formed and welded, making it suitable for complex designs.
- Biocompatibility: Essential for medical applications, ensuring compatibility with biological systems.
Chemical Composition
| Grade |
C (%) |
Mn (%) |
P (%) |
S (%) |
Si (%) |
Cr (%) |
Ni (%) |
Mo (%) |
| TP304 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
18.0-20.0 |
8.0-10.5 |
- |
| TP304L |
0.03 |
2.00 |
0.045 |
0.030 |
0.75 |
18.0-20.0 |
8.0-12.0 |
- |
| TP310 |
0.25 |
2.00 |
0.045 |
0.030 |
0.75 |
24.0-26.0 |
19.0-22.0 |
- |
| TP316 |
0.08 |
2.00 |
0.045 |
0.030 |
0.75 |
16.0-18.0 |
10.0-14.0 |
2.0-3.0 |
| TP316L |
0.03 |
2.00 |
0.045 |
0.030 |
0.75 |
16.0-18.0 |
10.0-14.0 |
2.0-3.0 |
Mechanical Properties
| Grade |
Yield Strength (MPa) |
Tensile Strength (MPa) |
Elongation (%) |
Hardness (HB) |
| TP304 |
205 |
515-720 |
40 |
183 |
| TP304L |
193 |
485-620 |
40 |
183 |
| TP310 |
205 |
520-720 |
40 |
183 |
| TP316 |
205 |
515-720 |
40 |
183 |
| TP316L |
193 |
485-620 |
40 |
183 |
Steel Grade
The steel grades covered under ASTM A632 are:
- TP304
- TP304L
- TP310
- TP316
- TP316L
Application
These stainless steel tubes are primarily used in:
- Medical devices and equipment
- Pharmaceutical manufacturing
- Food processing
- Chemical processing
- Oil and gas industries
Possible Alternative Grades
Depending on the specific requirements of an application, alternative grades may include:
- AISI 321: Offers better resistance to high-temperature oxidation.
- AISI 347: Provides improved corrosion resistance in high-temperature environments.
- AISI 630: A precipitation-hardening stainless steel with high strength.
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