ASTM A182 304 Stainless Steel Tube Austenitic Stainless Steel Pipe For High Temperature Service
ASTM A182 304 304H 304L 304N 304LN Stainless Steel Tube Austenitic Stainless Steel Pipe For High-Temperature Service
Material
ASTM A182 covers forged or rolled alloy and stainless steel pipe flanges, fittings, and valves for high-temperature service. The grades 304, 304H, 304L, 304N, and 304LN are austenitic stainless steels known for their excellent corrosion resistance and high-temperature strength.
Specification
The specification outlines the requirements for the chemical composition, mechanical properties, and manufacturing processes of these stainless steel grades. They are primarily used in high-temperature applications, such as in power generation, petrochemical, and chemical processing industries.
Key Features
- Corrosion Resistance: Excellent resistance to a wide range of corrosive environments.
- High-Temperature Strength: Maintains strength and stability at elevated temperatures.
- Versatility: Suitable for various applications, including pressure vessels and piping systems.
- Weldability: Good weldability, allowing for easy fabrication and assembly.
Chemical Composition
| Grade | C (%) | Cr (%) | Ni (%) | Mn (%) | Si (%) | P (%) | S (%) |
|---|---|---|---|---|---|---|---|
| 304 | 0.08 max | 18.0-20.0 | 8.0-10.5 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| 304H | 0.04-0.10 | 18.0-20.0 | 8.0-10.5 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| 304L | 0.03 max | 18.0-20.0 | 8.0-12.0 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| 304N | 0.08 max | 18.0-20.0 | 8.0-10.5 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
| 304LN | 0.03 max | 18.0-20.0 | 8.0-12.0 | 2.0 max | 1.0 max | 0.045 max | 0.03 max |
Mechanical Properties
| Grade | Yield Strength (MPa) | Tensile Strength (MPa) | Elongation (%) | Hardness (HB) |
|---|---|---|---|---|
| 304 | 205 | 515-720 | 40 | 201 |
| 304H | 205 | 515-720 | 40 | 201 |
| 304L | 170 | 480-620 | 40 | 197 |
| 304N | 205 | 515-720 | 40 | 201 |
| 304LN | 205 | 515-720 | 40 | 201 |
Steel Grade
The steel grades 304, 304H, 304L, 304N, and 304LN are commonly used in various applications due to their unique properties. Each grade has specific characteristics that make it suitable for different environments and conditions.
Application
These stainless steel grades are widely used in:
- Power Generation: Boiler tubes and heat exchangers.
- Chemical Processing: Piping systems and storage tanks.
- Oil and Gas: Equipment and piping in high-temperature environments.
- Food and Beverage: Processing equipment that requires corrosion resistance.
Possible Alternative Grades
While 304 series stainless steels are popular, alternative grades may be considered based on specific requirements:
- 316 Stainless Steel: Offers better corrosion resistance, especially in chloride environments.
- 321 Stainless Steel: Provides improved high-temperature stability.
- 310 Stainless Steel: Suitable for high-temperature applications due to its higher chromium and nickel content.
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