Ring Type Joint (RTJ) Flanges are specialized flanges designed for high-pressure and high-temperature applications. Unlike standard flanges, RTJ flanges use a metal-to-metal sealing system, where a precision-machined groove on the flange face holds a metallic ring gasket. When bolted together, the gasket deforms to create a tight, leak-proof seal, making RTJ flanges highly reliable in extreme environments.
These flanges are commonly used in oil & gas, chemical processing, petrochemical plants, and power generation industries, where safety and performance are critical. Their ability to withstand intense pressure and temperature fluctuations makes them ideal for pipelines, heat exchangers, and offshore drilling systems. RTJ flanges are preferred in applications requiring zero leakage, ensuring the integrity of high-stakes operations.
RTJ flanges are available in various materials, including stainless steel, duplex and super duplex steel, carbon steel, Inconel, and Hastelloy, to meet different industrial requirements. The choice of material depends on factors like corrosion resistance, mechanical strength, and thermal stability. Their superior design and durability make them a long-term investment for industries dealing with harsh operating conditions.
1. Composition of RTJ Flange Materials
RTJ flanges are made from high-strength metals to ensure durability, corrosion resistance, and mechanical stability under extreme conditions.
| Material | Primary Composition | Key Properties |
|---|---|---|
| Stainless Steel 304 | 18% Cr, 8% Ni, 2% Mn, 0.08% C | Excellent corrosion resistance, good strength |
| Stainless Steel 316 | 16% Cr, 10% Ni, 2-3% Mo, 0.08% C | Higher corrosion resistance, better for marine environments |
| Duplex 2205 | 22% Cr, 5-6% Ni, 3% Mo, 0.03% C | High strength, excellent chloride resistance |
| Super Duplex 2507 | 25% Cr, 7% Ni, 4% Mo, 0.03% C | Superior corrosion resistance and strength |
| Carbon Steel A105 | 0.35% C, 0.6-1.05% Mn, 0.35% Si | High strength, low-cost option |
| Inconel 625 | 58% Ni, 22% Cr, 9% Mo, 3.5% Nb | High-temperature and oxidation resistance |
| Hastelloy C276 | 57% Ni, 16% Mo, 15% Cr, 5% Fe | Exceptional corrosion resistance in harsh environments |
2. Properties of RTJ Flanges
| Property | Stainless Steel 304 | Stainless Steel 316 | Duplex 2205 | Super Duplex 2507 | Carbon Steel A105 | Inconel 625 | Hastelloy C276 |
|---|---|---|---|---|---|---|---|
| Yield Strength (MPa) | 215 | 290 | 450 | 550 | 250 | 460 | 283 |
| Tensile Strength (MPa) | 505 | 515 | 620 | 800 | 485 | 930 | 760 |
| Hardness (HB) | 201 | 217 | 270 | 310 | 190 | 225 | 240 |
| Density (g/cm³) | 8.0 | 8.0 | 7.8 | 7.8 | 7.85 | 8.44 | 8.9 |
| Corrosion Resistance | High | Very High | Excellent | Superior | Moderate | Extreme | Exceptional |
3. Machinability of RTJ Flange Materials
Machining RTJ flanges requires precision and advanced cutting tools due to the hardness of some materials.
| Material | Machinability Rating (%) | Cutting Tool Required |
|---|---|---|
| Stainless Steel 304 | 60% | High-speed steel (HSS) or carbide tools |
| Stainless Steel 316 | 55% | Carbide tools recommended |
| Duplex 2205 | 45% | Rigid tooling, slow speeds |
| Super Duplex 2507 | 40% | High-force machining required |
| Carbon Steel A105 | 80% | Easily machinable |
| Inconel 625 | 25% | Requires specialized tools |
| Hastelloy C276 | 20% | Very difficult, needs precision tooling |
4. Heat Resistance of RTJ Flanges
Different flange materials have varying temperature limits, making selection crucial for high-temperature applications.
| Material | Maximum Operating Temperature (°C) |
|---|---|
| Stainless Steel 304 | 870°C (1598°F) |
| Stainless Steel 316 | 925°C (1697°F) |
| Duplex 2205 | 600°C (1112°F) |
| Super Duplex 2507 | 650°C (1202°F) |
| Carbon Steel A105 | 425°C (797°F) |
| Inconel 625 | 1100°C (2012°F) |
| Hastelloy C276 | 1200°C (2192°F) |
5. Equivalent Grades of RTJ Flanges
RTJ flanges follow international standards and specifications to maintain quality and compatibility.
| Standard | Equivalent Grades |
|---|---|
| ASTM A182 | SS 304, SS 316, SS 321 |
| ASTM A105 | Carbon Steel A105 |
| ASTM A182 F51 | Duplex 2205 |
| ASTM A182 F53 | Super Duplex 2507 |
| ASTM B564 | Inconel 625, Inconel 718 |
| ASTM B564 | Hastelloy C22, Hastelloy C276 |
Why Choose AB Steel for RTJ Flanges?
✔ Wide Range of RTJ Flange Materials & Sizes
✔ Manufactured as per ASTM, ASME, API Standards
✔ High-Precision Machining for Leak-Proof Sealing
✔ Competitive Prices & Bulk Order Discounts
✔ Worldwide Shipping & Fast Delivery
