Views: 0 Author: J-VALVES Publish Time: 2022-01-11 Origin: Site
I. Introduction to S32750 Material
S32750 (2507) is a super duplex stainless steel. Its chemical composition includes high contents of chromium (24% - 26%), molybdenum (3% - 5%), and nitrogen (0.24% - 0.32%). These elements endow it with excellent corrosion resistance. Its main performance indicators are as follows:
Performance Indicator | Value Range |
Tensile Strength (σb) | ≥ 795 MPa |
Yield Strength (σs) | ≥ 550 MPa |
Elongation after Fracture (δ) | ≥ 15% |
Hardness (HBW) | ≤ 310 |
The pitting corrosion resistance equivalent (PREN) of S32750 reaches 40 - 43, which is much higher than that of ordinary stainless steel, enabling it to perform excellently in chloride-containing environments.
II. Special Requirements for Nuclear Power Filters
Nuclear power filters are mainly used for the purification of nuclear reactor coolants, radioactive waste liquids, and ventilation systems. Their materials need to meet the following special requirements:
• Radiation Resistance: Materials must maintain stable mechanical properties in a high-radiation environment and prevent embrittlement or degradation caused by irradiation.
• Corrosion Resistance: Nuclear reactor coolants contain corrosive substances such as boric acid and chloride ions, so materials need to have excellent anti-corrosion capabilities.
• High Strength and Toughness: Filters need to withstand high-pressure environments and maintain structural integrity under extreme working conditions.
• Long Service Life Design: The design life of nuclear-grade filters is usually 30 - 60 years, and materials need to have good anti-fatigue properties.
III. Mechanical Property Stability of S32750 in a Radiation Environment
1.Influence of Irradiation on S32750
Studies have shown that S32750 exhibits good mechanical property stability in a high-radiation environment. Its duplex microstructure (austenite and ferrite) enables it to effectively disperse stress during irradiation and reduce grain boundary weakening. Even under high-dose neutron irradiation, the tensile strength and yield strength of S32750 can still remain at a relatively high level.
2.Comparison with Other Materials
Material | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) | Corrosion Resistance | Radiation Resistance |
S32750 | ≥ 795 | ≥ 550 | ≥ 15 | Excellent | Stable |
316L | 515 | 310 | 35 | Good | Poor |
Inconel 690 | 700 | 350 | 20 | Excellent | Excellent |
Titanium Alloy (Gr.2/Gr.5) | 800 | 500 | 25 | Excellent | General |
It can be seen from the above table that S32750 is superior to 316L stainless steel in terms of strength and corrosion resistance. Meanwhile, its radiation resistance is comparable to that of Inconel 690, but with a lower cost.
IV. Application of S32750 in Nuclear Power Filters
FILTERS MADE OF S32750 MATERIAL ARE WIDELY USED IN NUCLEAR REACTOR COOLANT SYSTEMS, RADIOACTIVE WASTE LIQUID TREATMENT, AND SEAWATER FILTRATION SYSTEMS. Its high corrosion resistance and strength enable it to effectively intercept corrosion products, radioactive particles, and marine organisms, while maintaining long-term stable operation in extreme environments.
V. Conclusion
S32750 DUPLEX STAINLESS STEEL HAS BECOME AN IDEAL MATERIAL FOR NUCLEAR POWER FILTERS BY VIRTUE OF ITS EXCELLENT CORROSION RESISTANCE, HIGH STRENGTH, AND GOOD RADIATION RESISTANCE. Its mechanical property stability in a high-radiation environment enables it to meet the strict requirements of nuclear-grade equipment and provides a reliable guarantee for the safe operation of nuclear reactors. With the continuous development of the nuclear power industry, the application prospects of S32750 will be even broader.
