1. General Overview
The Class 300 Stainless Steel 316L Threaded Slip - on Flange is a crucial component in piping systems, renowned for its reliability, durability, and excellent performance in diverse industrial applications. The "Class 300" rating indicates its pressure - bearing capacity, while the use of 316L stainless steel endows it with outstanding corrosion resistance and mechanical properties. The threaded design allows for easy installation, and the slip - on feature simplifies the alignment process during assembly.
2. Material Properties and Composition
2.1 Material Properties
- Corrosion Resistance: 316L stainless steel, also known as "marine - grade" stainless steel, offers exceptional resistance to a wide range of corrosive media, including seawater, chloride - containing solutions, and various acids. This makes it ideal for applications in coastal areas, chemical processing plants, and marine environments.
- High - Temperature Resistance: It can maintain its mechanical integrity and resist oxidation at elevated temperatures, ensuring reliable performance in high - heat applications such as heat exchangers and furnace systems.
- Mechanical Strength: Despite its excellent corrosion - resistant properties, 316L stainless steel provides sufficient tensile and yield strength, allowing the flanges to withstand high - pressure conditions within the Class 300 rating.
2.2 Chemical Composition
The chemical composition of 316L stainless steel is the key to its superior properties. The following table presents the main elements and their approximate content ranges:
| Element |
Content Range (%) |
Role |
| Chromium (Cr) |
16 - 18 |
Forms a passive oxide layer on the surface, providing corrosion resistance |
| Nickel (Ni) |
10 - 14 |
Enhances corrosion resistance, especially in reducing environments, and improves the material's ductility |
| Molybdenum (Mo) |
2 - 3 |
Significantly boosts resistance to pitting and crevice corrosion, particularly in chloride - rich environments |
| Carbon (C) |
≤0.03 |
Reduces the risk of intergranular corrosion, a common issue in stainless steels |
| Manganese (Mn) |
≤2 |
Contributes to the strength and hardenability of the steel |
| Silicon (Si) |
≤1 |
Aids in deoxidation during steel production and can improve strength |
3. Key Features
- Threaded Design: The threaded connection allows for a secure and leak - proof joint with threaded pipes. It enables quick and easy assembly and disassembly, which is beneficial for maintenance and repair operations. This type of connection also provides good alignment and stability, reducing the risk of misalignment - related leaks.
- Slip - on Construction: The slip - on design of the flange allows it to be easily positioned over the pipe end. This simplifies the installation process, especially when compared to some other flange types. Once in place, the flange is welded to the pipe, creating a strong and reliable connection.
- Pressure - Rating Compliance: With a Class 300 rating, these flanges are designed to withstand a specific range of pressures. They are suitable for applications where the operating pressure typically ranges from moderate to relatively high, ensuring the safety and integrity of the piping system.
4. Applications
- Marine and Offshore Industries: Due to their excellent resistance to seawater corrosion, Class 300 316L Threaded Slip - on Flanges are widely used in marine vessels, offshore platforms, and desalination plants. They are employed in seawater intake and discharge systems, as well as in the piping for various onboard processes.
- Chemical and Petrochemical Industries: In chemical and petrochemical plants, where exposure to aggressive chemicals and high - pressure fluids is common, these flanges provide reliable performance. They are used in the transportation of corrosive chemicals, acids, and solvents, ensuring the safety and efficiency of the processes.
- Food and Beverage Industry: The hygienic nature of 316L stainless steel, along with its resistance to corrosion from cleaning agents and food - related substances, makes these flanges suitable for use in food processing, beverage production, and pharmaceutical manufacturing. They help maintain the integrity of the product and comply with strict hygiene standards.
- Power Generation: In power plants, whether thermal, nuclear, or renewable energy - based, these flanges are utilized in high - pressure and high - temperature piping systems. They are part of steam generation, cooling water, and chemical treatment systems, contributing to the overall reliability of the power generation process.
5. Equivalent Grades and Standards
316L stainless steel has equivalent grades in different international standards, which allows for global acceptance and compatibility in various projects. The following table lists some of the common equivalent grades:
| Standard |
Equivalent Grade |
| EN (European Norm) |
1.4404 |
| JIS (Japanese Industrial Standard) |
SUS316L |
| GB (Chinese National Standard) |
022Cr17Ni12Mo2 |
These equivalent grades share similar chemical compositions and mechanical properties, ensuring that flanges made from these materials can be used interchangeably in many applications while still meeting the required performance criteria.
6. Quality Assurance and Manufacturing
- Manufacturing Processes: These flanges are typically manufactured through processes such as forging, machining, and threading. Forging helps to improve the mechanical properties of the material by aligning the grain structure, while machining and threading ensure precise dimensions and a proper fit for the connection.
- Quality Control: Rigorous quality control measures are implemented during production. This includes inspections of the chemical composition, dimensional accuracy, and mechanical properties of the flanges. Non - destructive testing methods such as ultrasonic testing and magnetic particle inspection are also used to detect any internal or surface defects, ensuring that only high - quality flanges are delivered to customers.
Product Description
| Equipment |
| 3-axis, 4-axis and full 5-axis processing equipment, CNC lathe, centering machine, turning and milling compound, wire cutting, EDM, grinding, etc |
| Processing |
| CNC machining, CNC Turning, CNC Milling, Welding, Laser Cutting, Bending, Spinning, Wire Cutting, Stamping, Electric Discharge Machining (EDM), Injection Molding |
| Our Advantages |
|
|
1)24 hours online service & Quickly Quote/Delivery.
2)100% QC quality inspection before delivery, and can provide quality inspection form.
3)10+ years of experience in the CNC machining area and have a senior design team to offer perfect modification suggestions |
| Quality Assurance |
| 100% Inspect Before Shipment, ISO9001:2015, ISO13485:2016, SGS, RoHs, TUV |
| Serface Treatment |
Stainless Steel parts:Polishing, Passivating, Sandblasting, Laser engraving, Electrophoresis black, Oxide black
Steel parts:Zinc Plating, Oxide black, Nickel Plating, Chrome Plating, Carburized, Heat treatment
Brass parts:Nickel Plating, chrome plating, Electrophoresis black, Oxide black, Powder coated |
Technical Details
Pressure-Temperature Rating
The pressure-temperature rating is the maximum allowable working pressure (bar unit) of the material and grade used at the rated temperature (Celsius).
Temperature Consideration
Whether flange joints are used at high or low temperatures, leakage due to external forces and moments generated by the connected piping or equipment should be considered. To prevent leakage, pipe flanges and flanged fittings should avoid the application of severe external loads and sharp thermal gradients.
High Temperature
Application at temperatures in the creep range will result in decreasing bolt loads as relaxation of flanges, bolts, and gaskets takes place. Flanged joints subjected to thermal gradients may likewise be subject to decreasing bolt loads. Decreased bolt loads diminish the capacity of the flanged joint to sustain loads effectively without leakage. At temperatures above 200°C (400°F) for Class 150 and above 400°C (750°F) for other class designations, flanged joints may develop leakage problems unless care is taken to avoid imposing severe external loads, severe thermal gradients, or both.
Low Temperature
Some materials, especially some carbon steel materials, exhibit a significant decrease in ductility when used at low temperatures, and thus cannot withstand impact load, sudden stress changes, and high stress concentrations. Some regulations require an impact test even when the temperature is above -29 °C (−20°F).
Packaging & Shipping
Pressure Test
No pressure test is required on the flange.
Flanged fitting should be tested for shell pressure.
Shell Pressure Test for Flanged Fittings
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment.
Test Conditions
The shell pressure test for flanged fittings shall be at a pressure no less than 1.5 times the 38°C (100°F) pressure rating rounded off to the next higher 1 bar (25 psi) increment
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