ASTM A182 Stainless Steel Flanges
ASTM A182 stainless steel flanges are forged piping components made from high-quality alloy and stainless steel, designed for high-temperature, high-pressure, and corrosive service. Manufactured from ASTM A182 materials, these flanges are dimensionally compliant with ASME B16.5 / B16.47 standards. They are widely used in oil & gas, petrochemical, offshore, power generation, and industrial piping systems.
What is ASTM A182?
ASTM A182 specifies alloy and stainless steel forged or rolled components for piping systems under high temperature or pressure, including:
- Flanges
- Fittings
- Valves
It defines chemical composition, mechanical properties, heat treatment, and testing requirements for each grade.
Material Grades
| Grade | Description | Typical Application |
|---|---|---|
| F304 / F304L | General corrosion resistance | Oil & gas, water, chemical industry |
| F316 / F316L | Enhanced chloride resistance | Marine, offshore, chemical plants |
| F321 | Titanium stabilized, high temperature | Steam, high-temperature pipelines |
| Duplex F51 / F53 | High strength + corrosion resistance | Offshore, seawater, chemical industry |
Note: Duplex grades are used when specified for ASTM A182 flanges; not all projects require them.
Types of Flanges
We supply a full range of ASTM A182 forged stainless steel flanges:
| Type | Description |
|---|---|
| Weld Neck (WN) | High-pressure systems, strong joint |
| Slip-On (SO) | Easy installation, moderate pressure |
| Blind (BL) | Pipe end closure |
| Socket Weld (SW) | Small diameter, high-pressure piping |
| Threaded (TH) | Low-pressure, assembly without welding |
| Lap Joint (LJ) | Flange with stub end, easy dismantling |
| Ring Type Joint (RTJ) | High-pressure, oil & gas pipelines |
| Orifice / Long Weld Neck | Project-specific designs |
Size & Pressure Class
- Nominal sizes: 1/2" – 48" (DN15 – DN1200+)
- Pressure classes: Class 150 / 300 / 600 / 900 / 1500 / 2500
- Custom sizes and ratings available per project requirements
ASTM A182 Flange Selection Matrix
| Application | Recommended Grade | Pressure Class | Notes |
|---|---|---|---|
| Offshore seawater | F316L / Duplex F51 | 300–600 | High chloride, corrosion resistance |
| High-temp steam | F321 | 300–900 | Titanium stabilized |
| General oil & gas | F304 / F304L | 150–300 | Standard conditions |
| Chemical plant | F316L / F53 | 150–900 | Corrosive media |
| Water treatment | F304 / F304L | 150–300 | Mild corrosion |
This matrix helps buyers quickly select the appropriate material and class for their projects.
ASTM A182 Stainless Steel Flanges Manufacturing Process
- Raw material selection (ASTM A182 compliant)
- Forging (open die / closed die)
- Heat treatment (solution annealing / quenching)
- Rough and CNC machining
- Surface finishing
- Dimensional inspection
- Mechanical & chemical testing
ASTM A182 Flanges Quality Assurance & Testing
Mechanical & Chemical Testing
- Tensile strength, yield strength
- Hardness & impact tests
- Chemical composition verification (spectrometer)
Non-Destructive Testing (NDT)
- Penetrant Testing (PT) – standard
- Ultrasonic Testing (UT) – project-specific
- Radiographic Testing (RT) – when required
Documentation
- EN 10204 3.1 / 3.2 Mill Test Certificates (MTC)
- Heat number traceability
- Inspection & compliance reports
Surface Finish Options
- Raised Face (RF)
- Flat Face (FF)
- Ring Type Joint (RTJ)
- Serrated / custom finishes
- Protective coating or oil coating for shipment
ASTM A182 Flange in Stock
Packaging & Shipping
- Fumigated wooden crates
- Protective end caps
- Anti-rust oil coating
- Reinforced bundles for sea freight
- Global shipping support (sea, air, multimodal)
Applications
- Oil & gas pipelines
- Petrochemical plants
- Offshore platforms
- Power generation systems
- Heat exchangers
- Water treatment plants
- General industrial pressure piping
Flange Packaging and shipping
FAQ
Q1: Are ASTM A182 flanges suitable for high-pressure applications?
Yes, when used with the correct grade and pressure class, they are suitable for high-temperature and high-pressure piping systems.
Q2: What certificates are provided?
EN 10204 3.1 / 3.2 MTC with full heat number traceability.
Q3: What is the typical delivery time?
7–30 days depending on grade, size, and quantity.
Q4: What grades are best for offshore applications?
F316L and duplex F51/F53, due to high corrosion resistance.
Q5: Can custom flanges be manufactured?
Yes, non-standard dimensions, pressure ratings, and finishes are available on request.
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