ASA 300# Flanges
What are ASA 300# Flanges?
ASA 300# Flanges are medium-pressure flanges designed for use in systems requiring higher strength and tighter sealing compared to Class 150. Rated for up to 300 PSI, these flanges are used to connect pipes, valves, and other components in fluid transfer systems where durability and pressure resistance are critical.
Asiad Steel Industries is a trusted manufacturer and exporter of ASA 300# Flanges, offering a wide range of sizes and materials including stainless steel, carbon steel, and alloy steel. These flanges are designed to meet ANSI/ASME B16.5 standards for dimensional and pressure integrity.
Key Features
- Rated for 300 PSI – Suitable for medium-pressure industrial applications.
- Strong & Durable – Ideal for steam lines, chemical processing, and offshore systems.
- Wide Face Types – Raised Face, Flat Face, Ring Type Joint (RTJ).
- Available in multiple materials – SS, CS, Duplex, and custom alloys.
- International Compliance – Manufactured as per ASME, ANSI, and BS standards.
Types of ASA 300# Flanges
- Weld Neck Flanges
- Slip-On Flanges
- Blind Flanges
- Socket Weld Flanges
- Lap Joint Flanges
- Threaded Flanges
Specifications
Mechanical Properties
Chemical Composition
Equivalent Grades
Weight Chart
Specifications
| Parameter | Specification |
|---|---|
| Size Range | ½” to 24″ (DN15 – DN600) |
| Pressure Rating | Class 300 (300 PSI) |
| Standards | ANSI B16.5, ASME B16.5 |
| Facing Types | RF, FF, RTJ |
| Material Options | SS 304/316, CS A105, Duplex, Inconel |
| Manufacturing | Forged / Heat Treated / CNC Machined |
| Property | Value |
|---|---|
| Tensile Strength | 520 – 700 MPa |
| Yield Strength | 250 – 450 MPa |
| Hardness | 130 – 220 HB |
| Temperature Range | -40°C to +600°C |
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.08 – 0.30 |
| Manganese (Mn) | 0.50 – 1.70 |
| Silicon (Si) | 0.20 – 0.50 |
| Chromium (Cr) | 17.0 – 20.0 |
| Nickel (Ni) | 8.0 – 10.5 |
| Molybdenum (Mo) | 2.0 – 3.0 (SS 316) |
| Sulfur (S) | ≤ 0.035 |
| Phosphorus (P) | ≤ 0.040 |
| Iron (Fe) | Balance |
| Standard | Equivalent Grade |
|---|---|
| ASTM | A105, A182 F304 / F316 |
| EN | 1.4301 / 1.4401 |
| JIS | SUS 304 / SUS 316 |
| DIN | 1.4541 / 1.4571 |
| Flange Type | Size (Inch) | Approx. Weight (kg) |
|---|---|---|
| Weld Neck | 6″ | 20.30 |
| Slip-On | 8″ | 28.50 |
| Blind | 10″ | 41.20 |
Applications of ASA 300# Flanges
Construction &
Infrastructure
Automotive & Heavy
Equipment
Manufacturing &
Fabrication
Medical & Laboratory
Equipment
Electrical &
Electronics Assembly
Oil, Gas & Petrochemical
Installations
Do you have questions?
How is ASA 300# different from 150# flanges?
ASA 300# flanges are rated for higher pressure (up to 300 PSI), offering thicker walls and more secure sealing than 150#.
Can ASA 300# flanges be used for elevated temperatures?
Yes, depending on the material, they can withstand up to 600°C, making them suitable for steam and thermal systems.
Are custom face finishes available for ASA 300# flanges?
Yes. Options like serrated, smooth, and concentric face finishes are available on request.
What testing certifications are provided?
We provide Mill Test Certificates (MTC), hydro test reports, and third-party inspection approvals like TUV, BV, SGS.
