GB/T 30073 Seamless Austenitic Stainless Steel Tubes For Heat Exchangers In Nuclear Power Plant
Material and Specification
Seamless austenitic stainless steel tubes are widely used in heat exchangers within nuclear power plants. These tubes are specifically designed and produced according to the GB/T 30073 standard.
The GB/T 30073 standard covers the material, specification, key features, chemical composition, mechanical properties, steel grade, application, and possible alternative grades of these stainless steel tubes for heat exchangers in nuclear power plants. Let's explore these aspects in detail.
Chemical Composition
The following table presents the typical chemical composition of the seamless austenitic stainless steel tubes :
| Element | C | Si | Mn | P | S | Cr | Ni | Mo |
| Composition % | 0.08 max | 1.00 max | 2.00 max | 0.045 max | 0.030 max | 18.0-20.0 | 8.0-12.0 | 3.0-4.0 |
Mechanical Properties
The mechanical properties of the seamless austenitic stainless steel tubes are as follows:
| Property | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
| Minimum Value | 515 | 205 | 35 |
Steel Grade
The steel grade for seamless austenitic stainless steel tubes conforming to GB/T 30073 is designated as "TP304" or "TP304L." These grades are widely used due to their excellent corrosion resistance, high-temperature strength, and good mechanical properties.
Key Features
The key features of GB/T 30073 seamless austenitic stainless steel tubes for heat exchangers in nuclear power plants are as follows:
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Excellent corrosion resistance: These tubes are highly resistant to corrosion caused by a variety of factors, including high temperatures, aggressive chemicals, and chloride-containing environments.
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High-temperature strength: The stainless steel tubes exhibit exceptional strength and stability at elevated temperatures, making them suitable for use in heat exchangers within nuclear power plants.
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Good mechanical properties: These tubes offer good mechanical properties, including high tensile strength, yield strength, and elongation, ensuring long-lasting and reliable performance.
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Seamless construction: The seamless design of these tubes eliminates the risk of leakage, ensuring efficient heat transfer and minimizing downtime.
Application
GB/T 30073 seamless austenitic stainless steel tubes find extensive application in heat exchangers within nuclear power plants. These tubes are utilized for the following purposes:
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Steam generators: The stainless steel tubes facilitate the transfer of heat from the nuclear reactor's primary circuit (cooling water) to the secondary circuit, where steam is generated and used for power generation.
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Condensers: These tubes enable the efficient condensation of steam, allowing its conversion back into water and subsequent reuse in the steam generator.
Possible Alternative Grades
While TP304 and TP304L are the standard grades specified in GB/T 30073, there are alternative grades available that exhibit similar properties. Some possible alternative grades include:
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TP316: This grade offers enhanced corrosion resistance, particularly in chloride-rich environments, and is often chosen for applications where exceptional resistance to pitting and crevice corrosion is required.
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TP321: This grade contains titanium, which stabilizes the stainless steel against carbide precipitation, making it suitable for applications involving intermittent heating between 427°C and 816°C.
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TP347: This grade provides improved resistance to intergranular corrosion and chloride stress corrosion cracking, specifically in high-temperature environments.
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