NPS 8 ASTM A105 Slip On RF Flange
NPS 8 ASTM A105 Slip On RF Flange | SSM
SSM is a trusted global manufacturer and supplier of NPS 8 ASTM A105 Slip On Raised Face (SO RF) Flanges, designed for reliable performance, easy installation, and long service life in oil & gas, petrochemical, power generation, water treatment, and industrial piping systems.
The ASTM A105 carbon steel SO RF flange is widely used for connecting pipes, valves, pumps, and equipment. Its slip-on design provides convenient alignment and welding installation, while the raised face (RF) sealing surface ensures reliable gasket performance under pressure and temperature conditions.
1. Product Overview
The NPS 8 ASTM A105 SO RF Flange is a forged carbon steel slip-on flange manufactured according to international standards. The flange slides over the pipe end and is fillet welded internally and externally to provide a secure connection.
With excellent mechanical strength, good weldability, and cost-effectiveness, ASTM A105 slip-on flanges are commonly selected for medium-pressure piping systems where frequent maintenance and installation efficiency are important.
Product Specifications:
| Item | Specification |
|---|---|
| Standard | ASME B16.5 / ASTM A105 / Custom |
| Material | ASTM A105 Forged Carbon Steel |
| Flange Type | Slip On Flange (SO) |
| Facing Type | Raised Face (RF) |
| Size | NPS 8" (DN200) |
| Pressure Rating | Class 150 – Class 600 (Custom Available) |
| Manufacturing Process | Forging, Heat Treatment, CNC Machining |
| Applications | Oil & Gas, Petrochemical, Chemical, Power Plants, Water Systems |
2. Material Properties (ASTM A105 Carbon Steel)
ASTM A105 is a widely used forged carbon steel material designed for pressure piping components, including flanges, fittings, and valve parts.
| Element | Content (%) |
|---|---|
| Carbon (C) | ≤ 0.35 |
| Manganese (Mn) | 0.60 – 1.05 |
| Silicon (Si) | 0.10 – 0.35 |
| Phosphorus (P) | ≤ 0.035 |
| Sulfur (S) | ≤ 0.040 |
| Copper (Cu) | ≤ 0.40 |
| Nickel (Ni) | ≤ 0.40 |
| Chromium (Cr) | ≤ 0.30 |
| Molybdenum (Mo) | ≤ 0.12 |
ASTM A105 provides:
Excellent mechanical strength for pressure applications
Good weldability and machinability
Reliable performance in normal and elevated temperature services
Cost-effective solution compared with alloy and stainless steel flanges
3. Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength | ≥ 485 MPa |
| Yield Strength | ≥ 250 MPa |
| Elongation | ≥ 22% |
| Hardness | ≤ 187 HB |
| Service Temperature | Approx. -29°C to +425°C (depending on application) |
4. Key Features
✅ Reliable Carbon Steel Construction
Manufactured from ASTM A105 forged carbon steel, providing excellent pressure resistance and structural durability.
✅ Slip On Design for Easy Installation
The flange slides over the pipe, allowing easier alignment and welding compared with welded neck flanges.
✅ Raised Face (RF) Sealing Surface
The raised face design improves gasket contact pressure and provides dependable sealing performance.
✅ Cost-Effective Solution
More economical than butt-weld neck flanges, especially for general industrial piping applications.
✅ International Standard Compliance
Produced according to ASME B16.5, ASTM A105, and customer-specific requirements.
5. Advantages and Limitations
Advantages:
High mechanical strength for industrial piping systems
Easy installation and alignment
Lower manufacturing cost compared with WN flanges
Suitable for a wide range of industrial applications
Available in various pressure classes and sizes
Limitations:
Lower fatigue resistance compared with Weld Neck Flanges
Not recommended for extremely high-pressure or high-cyclic applications
Requires corrosion protection when exposed to aggressive environments
6. Applications
Oil & Gas Pipelines
Used for process piping, transportation lines, and equipment connections.
Petrochemical and Chemical Plants
Suitable for connecting pumps, vessels, reactors, and piping systems.
Power Generation Facilities
Applied in steam, cooling water, and utility piping systems.
Water Treatment Systems
Used in water supply, wastewater, and industrial fluid applications.
Industrial Equipment Connections
Commonly installed with valves, pumps, and pressure equipment.
7. Why Choose SSM
30+ years of experience in carbon steel flange manufacturing
ISO 9001 quality management system certified
Compliance with ASME B16.5 and ASTM A105 standards
Advanced forging, heat treatment, CNC machining, and inspection capabilities
Dimensional inspection, material testing, and NDT services available
Fast global delivery and customized flange solutions
8. Conclusion
The SSM NPS 8 ASTM A105 SO RF Flange provides a reliable, economical, and durable connection solution for industrial piping systems. With excellent mechanical properties, easy installation, and compliance with international standards, it is widely used in oil & gas, petrochemical, power, and water treatment industries.
SSM supplies high-quality ASTM A105 Slip On Raised Face Flanges with customized dimensions, pressure classes, and technical requirements to meet global project demands.
📩 Contact SSM today for quotation and technical support for your ASTM A105 SO RF flange requirements.
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