ASTM A312 TP304H is a specific grade of stainless steel pipe that conforms to the standards set by the American Society for Testing and Materials (ASTM). This grade, TP304H, is a high-carbon version of the TP304 stainless steel grade. The "TP" in the designation stands for "Type," indicating that this stainless steel pipe is intended for use in high-temperature applications such as in refineries, petrochemical plants, and power generation facilities. Stainless steel grade TP304H contains higher carbon content compared to TP304, which enhances its high-temperature strength and creep resistance. This makes it suitable for applications where the pipe is exposed to elevated temperatures, aggressive environments, and corrosive substances. The "304" in the grade designation indicates the composition is primarily composed of iron, chromium, and nickel, which impart excellent corrosion resistance and durability to the material.
ASTM A312 is the standard specification for seamless, welded, and heavily cold worked austenitic stainless steel pipes, meant for high-temperature and general corrosive service. TP304H pipes manufactured in accordance with this standard undergo various tests such as chemical analysis, mechanical testing, hydrostatic testing, non-destructive electric tests, and more to ensure the pipes meet the required quality and performance standards.
In summary, ASTM A312 TP304H stainless steel pipes are designed to provide superior high-temperature strength and corrosion resistance due to their higher carbon content. These pipes are commonly used in industries where reliable performance at elevated temperatures is crucial, making them an essential component in various industrial processes..
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Specification:
| Specification | ASTM A312 TP304H Stainless Steel Pipe |
| Grade | TP304H |
| Standards | ASTM A312 |
| Type | Seamless, Welded |
| Application | High-temperature and corrosive environments in refineries, petrochemical plants, power generation facilities, etc. |
| Key Properties | Enhanced high-temperature strength and creep resistance due to higher carbon content. Excellent corrosion resistance. |
| Manufacturing | Chemical analysis, mechanical testing, hydrostatic testing, non-destructive electric tests, etc. |
| Common Uses | Boiler tubes, superheaters, heat exchangers, and other high-temperature applications. |
| Benefits | Reliable performance at elevated temperatures, resistance to corrosion and aggressive environments. |
| Important Notes | TP304H is a high-carbon version of TP304 for improved high-temperature properties. |
Chemical Composition of ASTM A312 TP304H Stainless Steel Pipe
| Element | Composition Range |
| Chromium (Cr) | 18.0 - 20.0% |
| Nickel (Ni) | 8.0 - 10.5% |
| Carbon (C) | 0.04 - 0.10% |
| Manganese (Mn) | Up to 2.00% |
| Silicon (Si) | Up to 0.75% |
| Phosphorus (P) | Up to 0.045% |
| Sulfur (S) | Up to 0.030% |
| Iron (Fe) | Balance |
Mechanical Properties of ASTM A312 TP304H Stainless Steel Pipe
| Property | Typical Range |
| Tensile Strength | 75,000 - 95,000 psi |
| Yield Strength (0.2%) | 30,000 - 35,000 psi |
| Elongation (in 2") | 35 - 55% |
| Hardness (Brinell) | 170 - 202 |
| Hardness (Rockwell B) | 85 - 95 |
| Modulus of Elasticity | 28.5 x 10^6 psi (196 GPa) |
| Poisson's Ratio | 0.33 - 0.37 |
Advantages of ASTM A312 TP304H Stainless Steel Pipe
- Good general corrosion resistance and high strength
- Good sulfide stress corrosion resistance
- Resistance to chloride pitting and crevice corrosion
- Higher resistance to chloride stress corrosion cracking
- Easy to weld and conform
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Applications Industry
| Pharmaceutical Equipment | Chemical Equipment |
| Sea Water Equipment | Heat Exchangers |
| Heat Exchangers | Gas Processing |
| Condensers | Specialty Chemicals |
| Pulp and Paper Industry | Pharmaceuticals |
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