RTJ Flange
Ring-type-joint (RTJ) flanges to ASME B16.5 with a ring groove for metal ring-gasket sealing at high pressure and temperature — in carbon, alloy, stainless, duplex and nickel grades.
Technical specification
| Parameter | Specification |
|---|---|
| Product | Forged fittings (socket-weld / threaded) & flanges |
| Dimensional standard | ASME B16.11 (forged fittings) · B16.5 / B16.47 (flanges) |
| Classes | SW 3000/6000/9000 · Thd 2000/3000/6000 · Flange 150–2500 |
| Facings (flanges) | RF · FF · RTJ |
| Size range | 1/8" – 4" (forged fittings) · 1/2" – 60" (flanges) |
| Material specifications | ASTM A105/A105N, A350, A182, B564, B462 |
| Sour service | NACE MR0175 / ISO 15156 where specified |
| Documentation | EN 10204 3.1 / 3.2, PMI, TPI |
How it is made
Forgings are open- or closed-die forged from bar or billet, then heat treated to the grade requirement — carbon A105 as-forged or normalised; low-temp A350 normalised (and tempered) with Charpy testing; Cr-Mo A182 F-grades normalised & tempered; austenitic stainless solution annealed; duplex solution annealed and rapidly cooled. Socket-weld and threaded fittings are machined to ASME B16.11 (NPT threads to ASME B1.20.1); flange faces are machined to the specified finish and facing (RF serrated, RTJ ring groove). Class denotes a pressure-temperature rating basis, not a pressure in psi.
Grades & materials
All grades supplied for this product family, with representative chemistry. Exact grade, class and condition are confirmed per order.
| Material family | Grades | UNS | Standard | Service |
|---|---|---|---|---|
| Carbon steel | A105 / A105N | K03504 | ASME B16.5/B16.11 / ASTM A105 | General service |
| Low-temp carbon | A350 LF2 Cl.1/2, LF3, LF6 | — | ASTM A350 | Low temperature |
| Cr-Mo alloy | A182 F1, F11, F12, F22, F5, F9, F91, F92 | — | ASTM A182 | High-temperature |
| Austenitic stainless | A182 F304/304L/304H, F316/316L/316H, F321, F347, F317L, F44 (6Mo) | — | ASTM A182 | Corrosion / high temp |
| Duplex / super duplex | A182 F51 (2205), F60 (2205), F53 (2507), F55 (2760) | — | ASTM A182 | Chloride / sour |
| Nickel alloys | B564 N06600 (600), N06625 (625), N04400 (Monel), N10276 (C-276), N08825 (825) | — | ASTM B564 | Severe corrosion |
| Alloy 20 | B462 N08020 | N08020 | ASTM B462 | Sulphuric acid |
Chemical composition (representative)
| Grade | C | Mn | Si | Cr | Ni | Mo | Other |
|---|---|---|---|---|---|---|---|
| A105 | 0.35 max | 0.60–1.05 | 0.10–0.35 | 0.30 max | 0.40 max | 0.12 max | Cu 0.40 max |
| A350 LF2 | 0.30 max | 0.60–1.35 | 0.15–0.30 | 0.30 max | 0.40 max | 0.12 max | — |
| A182 F11 Cl.2 | 0.05–0.15 | 0.30–0.60 | 0.50–1.00 | 1.00–1.50 | — | 0.44–0.65 | — |
| A182 F22 Cl.3 | 0.05–0.15 | 0.30–0.60 | 0.50 max | 2.00–2.50 | — | 0.87–1.13 | — |
| A182 F91 | 0.08–0.12 | 0.30–0.60 | 0.20–0.50 | 8.0–9.5 | 0.40 max | 0.85–1.05 | V 0.18–0.25, Nb 0.06–0.10, N 0.03–0.07 |
| A182 F304L | 0.030 max | 2.00 max | 1.00 max | 18.0–20.0 | 8.0–13.0 | — | — |
| A182 F316L | 0.030 max | 2.00 max | 1.00 max | 16.0–18.0 | 10.0–15.0 | 2.0–3.0 | — |
| A182 F51 (2205) | 0.030 max | 2.00 max | 1.00 max | 21.0–23.0 | 4.5–6.5 | 2.5–3.5 | N 0.08–0.20 |
| A182 F53 (2507) | 0.030 max | 1.20 max | 0.80 max | 24.0–26.0 | 6.0–8.0 | 3.0–5.0 | N 0.24–0.32 |
| A182 F44 (6Mo) | 0.020 max | 1.00 max | 0.80 max | 19.5–20.5 | 17.5–18.5 | 6.0–6.5 | N 0.18–0.25, Cu 0.5–1.0 |
| B564 625 | 0.10 max | 0.50 max | 0.50 max | 20.0–23.0 | 58.0 min | 8.0–10.0 | Nb 3.15–4.15 |
| B462 Alloy 20 | 0.07 max | 2.00 max | 1.00 max | 19.0–21.0 | 32.0–38.0 | 2.0–3.0 | Cu 3.0–4.0, Nb 8×C–1.0 |
Standards & specifications
Dimensional
- ASME B16.11 forged socket-weld & threaded fittings
- ASME B16.5 flanges NPS ½–24
- ASME B16.47 A/B flanges NPS 26–60
- ASME B16.20 ring-joint / spiral-wound gaskets
Material & service
- ASTM A105/A350 carbon & low-temp forgings
- ASTM A182 alloy, stainless & duplex forgings
- ASTM B564/B462 nickel & Alloy 20
- NACE MR0175 / ISO 15156 sour service
Mechanical properties (representative grades)
Representative grades — full MTC values on request. Values are ASTM/ASME specification minima or ranges at room temperature.
| Grade | Type | Tensile (MPa) | Yield min (MPa) | Elong min (%) |
|---|---|---|---|---|
| A105 / A105N | Carbon | 485 | 250 | 22 |
| A350 LF2 Cl.1 | Low-temp C (−46 °C) | 485–655 | 250 | 22 |
| A350 LF3 | 3½Ni (−101 °C) | 485–655 | 260 | 22 |
| A350 LF6 Cl.1 | Low-temp C-Mn | 440– | 250 | 22 |
| A182 F1 | C-½Mo | 485 | 275 | 22 |
| A182 F11 Cl.2 | 1¼Cr-½Mo | 515 | 310 | 20 |
| A182 F12 Cl.2 | 1Cr-½Mo | 485 | 275 | 20 |
| A182 F22 Cl.3 | 2¼Cr-1Mo | 515 | 310 | 18 |
| A182 F5 | 5Cr-½Mo | 485 | 275 | 20 |
| A182 F9 | 9Cr-1Mo | 620 | 380 | 20 |
| A182 F91 | 9Cr-1Mo-V | 585 | 415 | 20 |
| A182 F92 | 9Cr-2W | 620 | 440 | 20 |
| A182 F304 / F304H | Austenitic SS | 515 | 205 | 30 |
| A182 F304L | Austenitic SS | 485 | 170 | 30 |
| A182 F316 / F316H | Austenitic SS | 515 | 205 | 30 |
| A182 F316L | Austenitic SS | 485 | 170 | 30 |
| A182 F317L | Austenitic SS | 515 | 205 | 35 |
| A182 F321 | Austenitic SS | 515 | 205 | 30 |
| A182 F347 | Austenitic SS | 515 | 205 | 30 |
| A182 F44 (6Mo) | Super-austenitic | 650 | 300 | 35 |
| A182 F51 (2205) | Duplex | 620 | 450 | 25 |
| A182 F60 (2205) | Duplex | 655 | 485 | 25 |
| A182 F53 (2507) | Super duplex | 795 | 550 | 15 |
| A182 F55 (2760) | Super duplex | 750 | 550 | 25 |
| B564 N06600 (600) | Ni-Cr | 550 | 240 | 30 |
| B564 N06625 (625) | Ni-Cr-Mo | 760 | 345 | 30 |
| B564 N04400 (Monel 400) | Ni-Cu | 480 | 170 | 35 |
| B564 N10276 (C-276) | Ni-Mo-Cr | 690 | 283 | 40 |
| B564 N08825 (825) | Ni-Fe-Cr | 585 | 235 | 30 |
| B462 N08020 (Alloy 20) | Ni-Fe-Cr-Mo | 551 | 241 | 30 |
Testing, inspection & documentation
| Test / document | Detail |
|---|---|
| Chemical / PMI | Product-analysis chemistry; PMI on alloy, stainless & nickel grades |
| Tensile | Tensile, yield and elongation per grade (ASTM A370) |
| Impact (Charpy) | A350 LF2/LF3/LF6 at the grade test temperature; and where specified |
| Hardness | Brinell/Rockwell; NACE MR0175 hardness for sour service (e.g. F22 ≤ 22 HRC) |
| Corrosion | IGC per ASTM A262 (austenitic); ferrite / phase check (duplex) |
| NDE | UT / MPI / DPT as specified; 100 % visual and dimensional |
| Certification | EN 10204 3.1 as standard; 3.2 with third-party endorsement |
Applications & industries served
Available forms, sizes & range
Provide with your enquiry
- NPS and pressure class.
- Facing (RF / FF / RTJ) and finish.
- Material grade and bore/schedule where relevant.
And the commercial detail
- Standard (B16.5 / B16.47) and edition.
- Required tests and certification.
- Quantity and any drawing or BOQ.
Frequently asked questions
When is an RTJ flange used?
For high-pressure and high-temperature service where a metal ring gasket gives a more reliable seal than a soft gasket — common in oil & gas and wellhead service.
Which ring gaskets are used?
R, RX or BX metal ring gaskets to ASME B16.20, matched to the ring groove and class.
What classes are available?
Typically Class 600 to 2500 to ASME B16.5.
Request a quote
Send your requirement to Sagiant Piping Industries and our team responds with grade, material selection, availability and pricing for rtj flange. Attach a BOQ, line list or drawing for a faster, more accurate quotation.
- Fast RFQ response with grade & material-selection support
- EN 10204 3.1 / 3.2 certification, PMI & third-party inspection
- BOQ & line-list project supply — India & export
Mechanical & chemical values shown are ASTM/ASME specification figures; certified heat-specific values appear on the MTC. Availability is confirmed with the quotation.
