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End Blind Flange
QS Flange: End Blind Flange
Name: End Blind Flange
Type: BL
Process Method: Forged
Material: Stainless Steel
Face: RF
Class: 150 LB
Size: 1/2 to 24 Inch
Feature: High Corrosion-resistant and Environmentally Friendly
Standard: ANSI B16.5
Manufacture Standard: ANSI B16.5
Usage: The end of the pipeline is blocked or temporarily blocked
Type: BL
Process Method: Forged
Material: Stainless Steel
Face: RF
Class: 150 LB
Size: 1/2 to 24 Inch
Feature: High Corrosion-resistant and Environmentally Friendly
Standard: ANSI B16.5
Manufacture Standard: ANSI B16.5
Usage: The end of the pipeline is blocked or temporarily blocked
Quantity
The End Blind Flange is made from stainless steel using forging processes and complies with the ANSI B16.5 standard. It features a Raised Face (RF) design, is suitable for a pressure rating of 150LB, and is available in sizes ranging from 1/2 inch to 24 inches. This product offers high corrosion resistance and eco-friendly properties, specifically designed for permanent or temporary sealing of pipeline ends, ensuring the safety and sealing integrity of pipeline systems.
The high corrosion resistance of the End Blind Flange is one of its core advantages, particularly in harsh corrosive environments such as chemical and marine applications.
1. Material Properties
The End Blind Flange is typically made from austenitic stainless steels such as 304, 304L, 316, and 316L, which exhibit the following characteristics:
- High Chromium Content: Chromium content ≥18%, forming a dense chromium oxide (Cr₂O₃) protective film on the surface, effectively isolating corrosive media.
The End Blind Flange is typically made from austenitic stainless steels such as 304, 304L, 316, and 316L, which exhibit the following characteristics:
- High Chromium Content: Chromium content ≥18%, forming a dense chromium oxide (Cr₂O₃) protective film on the surface, effectively isolating corrosive media.
- Addition of Nickel and Molybdenum: Nickel (Ni) enhances the material's toughness and corrosion resistance, while molybdenum (Mo) further improves resistance to chloride ion corrosion (e.g., 316L contains 2%-3% molybdenum).
- Low Carbon Design: 304L and 316L are low-carbon stainless steels with carbon content ≤0.03%, reducing the risk of intergranular corrosion.
2. Corrosion Mechanisms and Protection
The corrosion resistance of the End Blind Flange is primarily reflected in the following aspects:
- Uniform Corrosion: In acidic, alkaline, and saline media, the oxide film on the stainless steel surface effectively prevents uniform corrosion. For example, 304 stainless steel can withstand ≤10% sulfuric acid and ≤20% hydrochloric acid at room temperature.
The corrosion resistance of the End Blind Flange is primarily reflected in the following aspects:
- Uniform Corrosion: In acidic, alkaline, and saline media, the oxide film on the stainless steel surface effectively prevents uniform corrosion. For example, 304 stainless steel can withstand ≤10% sulfuric acid and ≤20% hydrochloric acid at room temperature.
- Pitting and Crevice Corrosion: The addition of molybdenum significantly enhances resistance to chloride-induced pitting. The critical pitting temperature (CPT) of 316L stainless steel in chloride-containing media can exceed 50°C.
- Intergranular Corrosion: Low-carbon stainless steels (e.g., 304L, 316L) reduce carbon content to prevent chromium carbide precipitation at grain boundaries, thereby avoiding intergranular corrosion.
- Stress Corrosion Cracking (SCC): Austenitic stainless steels exhibit high resistance to chloride-induced stress corrosion cracking under high temperature and pressure. 316L stainless steel can withstand ≤1000ppm chloride ion concentration at temperatures below 60°C.
3. Corrosion Resistance in Practical Applications
The End Blind Flange performs exceptionally well in the following corrosive environments:
Chemical Industry:
- In strong acid media such as sulfuric acid, hydrochloric acid, and nitric acid, 304 and 316L stainless steels demonstrate excellent corrosion resistance. For example, the corrosion rate of 304 stainless steel in ≤65% nitric acid is <0.1mm/year.
The End Blind Flange performs exceptionally well in the following corrosive environments:
Chemical Industry:
- In strong acid media such as sulfuric acid, hydrochloric acid, and nitric acid, 304 and 316L stainless steels demonstrate excellent corrosion resistance. For example, the corrosion rate of 304 stainless steel in ≤65% nitric acid is <0.1mm/year.
- In alkaline media, the End Blind Flange can withstand ≤50% sodium hydroxide solution.
Marine Environment:
- 316L stainless steel, with its high molybdenum content, exhibits strong resistance to chloride ion corrosion in seawater. In marine atmospheres, the corrosion rate of 316L is only 0.002mm/year.
- 316L stainless steel, with its high molybdenum content, exhibits strong resistance to chloride ion corrosion in seawater. In marine atmospheres, the corrosion rate of 316L is only 0.002mm/year.
- Suitable for seawater desalination equipment, offshore platform pipeline systems, and more.
Food and Pharmaceutical Industry:
- In weak acids, weak alkalis, and organic acids, 304 and 316L stainless steels show excellent corrosion resistance, meeting food-grade and pharmaceutical-grade standards.
- In weak acids, weak alkalis, and organic acids, 304 and 316L stainless steels show excellent corrosion resistance, meeting food-grade and pharmaceutical-grade standards.
Environmental Engineering:
- In environments such as wastewater and exhaust gas treatment, the End Blind Flange can withstand corrosive gases like hydrogen sulfide and ammonia.
- In environments such as wastewater and exhaust gas treatment, the End Blind Flange can withstand corrosive gases like hydrogen sulfide and ammonia.
4. Conclusion
The End Blind Flange, with its high chromium, nickel, and molybdenum content and low-carbon design, demonstrates exceptional corrosion resistance in acidic, alkaline, and saline media. Whether in the strong acid and alkali environments of the chemical industry or the high chloride ion environments of marine engineering, it provides reliable sealing solutions, ensuring the long-term stable operation of pipeline systems. Choosing the End Blind Flange means choosing comprehensive protection against corrosive environments.
The End Blind Flange, with its high chromium, nickel, and molybdenum content and low-carbon design, demonstrates exceptional corrosion resistance in acidic, alkaline, and saline media. Whether in the strong acid and alkali environments of the chemical industry or the high chloride ion environments of marine engineering, it provides reliable sealing solutions, ensuring the long-term stable operation of pipeline systems. Choosing the End Blind Flange means choosing comprehensive protection against corrosive environments.
The End Blind Flange: A corrosion-resistant sealing solution for demanding applications!
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