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SAE Code 61 Flange
QS Flange: SAE Code 61 Flange
Name: SAE Code 61 Flange
Standard: SAE J518
Size: 1-1/2 Inch
Material: SS304
Pressure: 3000 psi
Type: SW
Code: 61
Application: used in pipe and tube systems for pumps and oil-dynamic applications in many industries such as mining, shipbuilding, paper processing, machinery manufacturing, building machinery and so on.
Standard: SAE J518
Size: 1-1/2 Inch
Material: SS304
Pressure: 3000 psi
Type: SW
Code: 61
Application: used in pipe and tube systems for pumps and oil-dynamic applications in many industries such as mining, shipbuilding, paper processing, machinery manufacturing, building machinery and so on.
Quantity
SAE Code 61 Flange, compliant with the SAE J518 standard, has a size of 1-1/2 inches and is made of SS304 stainless steel, with a pressure resistance of up to 3000 psi. It belongs to the SW (Socket Weld) type. This flange is specifically designed for pipeline and pump systems and is widely used in industries such as mining, shipbuilding, paper manufacturing, machinery manufacturing, and construction machinery. Its high strength and corrosion resistance ensure reliable connections under high-pressure and dynamic operating conditions, making it an ideal choice for industrial equipment.
The SAE Code 61 Flange is made of SS304 stainless steel, with corrosion resistance being one of its core advantages.
1. Material Characteristics
SS304 stainless steel is an austenitic stainless steel with the following main composition:
- Chromium (Cr): 18-20%
- Nickel (Ni): 8-10.5%
- Carbon (C): ≤0.08%
- Manganese (Mn): ≤2%
- Silicon (Si): ≤1%
- Phosphorus (P): ≤0.045%
- Sulfur (S): ≤0.03%
SS304 stainless steel is an austenitic stainless steel with the following main composition:
- Chromium (Cr): 18-20%
- Nickel (Ni): 8-10.5%
- Carbon (C): ≤0.08%
- Manganese (Mn): ≤2%
- Silicon (Si): ≤1%
- Phosphorus (P): ≤0.045%
- Sulfur (S): ≤0.03%
Chromium (Cr) is the key element that provides SS304 stainless steel with its corrosion resistance. Chromium forms a dense chromium oxide (Cr₂O₃) passive layer on the surface, effectively isolating the corrosive medium from the base material, thereby offering excellent corrosion resistance.
2. Corrosion Mechanisms and Protection
The corrosion resistance of the SAE Code 61 Flange is mainly reflected in the following aspects:
The corrosion resistance of the SAE Code 61 Flange is mainly reflected in the following aspects:
2.1 Acid Resistance
Dilute Acid Environments: The SAE Code 61 Flange exhibits good corrosion resistance in weak acid environments such as dilute sulfuric acid (H₂SO₄) and dilute hydrochloric acid (HCl). For example, in a 10% sulfuric acid solution, the corrosion rate is below 0.1 mm/year.
Dilute Acid Environments: The SAE Code 61 Flange exhibits good corrosion resistance in weak acid environments such as dilute sulfuric acid (H₂SO₄) and dilute hydrochloric acid (HCl). For example, in a 10% sulfuric acid solution, the corrosion rate is below 0.1 mm/year.
Organic Acids: It demonstrates excellent resistance to organic acids such as acetic acid and citric acid, making it suitable for the food and chemical industries.
2.2 Alkali Resistance
Strong Alkali Environments: The SAE Code 61 Flange shows good corrosion resistance in strong alkali solutions such as sodium hydroxide (NaOH). For example, in a 50% sodium hydroxide solution, the corrosion rate is below 0.01 mm/year.
Strong Alkali Environments: The SAE Code 61 Flange shows good corrosion resistance in strong alkali solutions such as sodium hydroxide (NaOH). For example, in a 50% sodium hydroxide solution, the corrosion rate is below 0.01 mm/year.
2.3 Oxidation Resistance
Oxidizing Media: In oxidizing media such as nitric acid (HNO₃) and hydrogen peroxide (H₂O₂), the passive layer of the SAE Code 61 Flange becomes more stable, resulting in an extremely low corrosion rate. For example, in a 65% nitric acid solution, the corrosion rate is below 0.05 mm/year.
Oxidizing Media: In oxidizing media such as nitric acid (HNO₃) and hydrogen peroxide (H₂O₂), the passive layer of the SAE Code 61 Flange becomes more stable, resulting in an extremely low corrosion rate. For example, in a 65% nitric acid solution, the corrosion rate is below 0.05 mm/year.
2.4 Chloride Ion Resistance
Chloride Ion Environments: The SAE Code 61 Flange performs well in low-concentration chloride ion environments. However, in high-concentration chloride ion environments (e.g., seawater), pitting or stress corrosion cracking may occur. Therefore, SS316 stainless steel is recommended for marine environments.
Chloride Ion Environments: The SAE Code 61 Flange performs well in low-concentration chloride ion environments. However, in high-concentration chloride ion environments (e.g., seawater), pitting or stress corrosion cracking may occur. Therefore, SS316 stainless steel is recommended for marine environments.
3. Application Environments
The corrosion resistance of the SAE Code 61 Flange makes it suitable for the following environments:
Chemical Industry: Used in pipeline systems for transporting corrosive media such as acids, alkalis, and salts.
Food Industry: Suitable for organic acid environments such as acetic acid and citric acid, meeting food-grade standards.
Pharmaceutical Industry: Performs excellently in oxidizing media (e.g., hydrogen peroxide), making it suitable for sterile environments.
The corrosion resistance of the SAE Code 61 Flange makes it suitable for the following environments:
Chemical Industry: Used in pipeline systems for transporting corrosive media such as acids, alkalis, and salts.
Food Industry: Suitable for organic acid environments such as acetic acid and citric acid, meeting food-grade standards.
Pharmaceutical Industry: Performs excellently in oxidizing media (e.g., hydrogen peroxide), making it suitable for sterile environments.
Energy Industry: Used in pipeline systems for transporting high-temperature and high-pressure water, steam, and other media.
4. Experimental Data
The following table shows the typical corrosion rates of the SAE Code 61 Flange in different corrosive media:
The following table shows the typical corrosion rates of the SAE Code 61 Flange in different corrosive media:
| Corrosive Medium | Concentration | Temperature | Corrosion Rate (mm/year) |
| Sulfuric Acid (H₂SO₄) | 10% | 25°C | <0.1 |
| Hydrochloric Acid (HCl) | 10% | 25°C | <0.5 |
| Nitric Acid (HNO₃) | 65% | 25°C | <0.05 |
| Sodium Hydroxide (NaOH) | 50% | 25°C | <0.01 |
| Acetic Acid (CH₃COOH) | 10% | 25°C | <0.01 |
| Seawater | - | 25°C | 0.1-0.5 (possible pitting) |
5. Conclusion
The SAE Code 61 Flange, made of SS304 stainless steel, offers excellent resistance to acids, alkalis, and oxidation, meeting the requirements of various corrosive environments. Its stable passive layer and low corrosion rate ensure long-term reliability in industries such as chemical, food, and pharmaceutical. Through proper selection and maintenance, the SAE Code 61 Flange provides users with efficient and durable connection solutions.
The SAE Code 61 Flange, made of SS304 stainless steel, offers excellent resistance to acids, alkalis, and oxidation, meeting the requirements of various corrosive environments. Its stable passive layer and low corrosion rate ensure long-term reliability in industries such as chemical, food, and pharmaceutical. Through proper selection and maintenance, the SAE Code 61 Flange provides users with efficient and durable connection solutions.
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