Stainless Steel 904L Forged Flanges
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The Ratna Exports Company is one of the leading manufacturers, exporters, and suppliers of Forged Flanges 904L manufactured according to ASME B16.11 and other standards. We are constantly adding to our diverse product range to serve our valued customers better, which is why we have forged threaded pipe fittings available ex-stock in all primary Stainless Steel grades (ASTM A182, F316L, F904LL) and ASTM A105.
A wide array of forged threaded fittings can be found at our company, including threaded elbows, tees, threaded crosses, threaded bends, threaded couplings, threaded caps, threaded unions, hexagon bushings, square plugs, and hexagon plugs. Additionally, we manufacture and supply fittings of various stainless steel and exceptional Alloy grades that meet your exact specifications.
At our factory, the surface of the stainless steel forged fittings is usually either ground or polished, which in turn assists in removing any traces of oxide from the surface and removing surface decarburization. It is possible to use 316 SS Socket Weld Fittings in continuous service up to a temperature of approximately 1300 °F, where scaling becomes excessive when exposed to high temperatures. Furthermore, these ASTM A182 F904L Bushing & Couplings are suitable for intermittent service at temperatures as high as 1500 °F. Can use Them intermittently at temperatures as high as the eves.
A suitable fitting, in this case, the Stainless Steel 904L Forged Tee, will be able to store and handle acetic acid. As oxygen protects the metal under such conditions, even though it offers the highest corrosion resistance, the ASTM A182 SS Forged Elbow is especially helpful in solutions containing acetic acid and formic acid or in solutions where aeration is not possible.
Contact Ratna Exports today for a best offer & competitive quotation Of Stainless Steel 904L Forged Flanges
Stainless Steel 904L Forged Flanges Specification
| Size Chart | 1/2″(15 NB) to 48″ (1200 NB) |
| Pressure Rating Chart ANSI | 150 LBS, 300 LBS, 2500 LBS, 900 LBS, 600 LBS, 1500 LBS |
| UNI / EN | 16 Bar 6 Bar 40Bar 10 Bar 25Bar |
| Manufacturer of Connect Type/ Flange Face Type | RF, RTJ, FF, LJF, Small Tongue, Large Tongue & Groove |
| JIS | 16 K, 5K, 10 K, 20 K, 30 K, 40 K, 63 K |
| Coating | Yellow Transparent, Zinc Plated, Anti-rust Paint, Oil Black Paint, Cold, and Hot Dip Galvanised |
| Origin | West Europe / Japan / India / USA / Korean |
| DIN Pressure Calculation | 25Bar 40Bar 16 Bar 6 Bar 10 Bar / PN64 PN10 PN25 PN16 PN6 PN40 |
| Manufacturer of | ANSI DIN, GOST, JIS, UNI, BS, AS2129, SABS, NFE, AWWA, EN, etc. |
| Common Types By Manufacturer | Threaded / Screwed / Forged / Plate |
| Equipment | Press machine, Bending machine, Pushing Machine, Sand-blasting machine, electric bevelling machine, etc. |
| Test | Direct-reading Spectrograph, Ultrasonic flaw detector, Magnetic particle detector, X-ray detector, Hydrostatic testing machine |
| Production Grades | 316h SS / 317 SS / 317L SS / 321 SS / 321H SS / 347 SS / 904LH SS / 347H SS / 310s SS / 446 SS / 904LSS / 904LL SS / 316 SS / 316L SS / 310 SS / 347 SS / 904L SS |
| Production Technique Used By Manufacturer | Heat-treated, Forged, and machined |
| Standards Provided By Manufacturer | API7S-43, API605, B16.48, ISO70051, MSS S44, ANSI/ASME B16.5, B16.47 Series A & B, BS4504, BS 10, EN-1092, DIN, API7S-15, JISB2220, BS1560-3.1, ASME/ANSI B16.5/16.36/16.47A/16.47B, EN1092 |
Types of Stainless Steel 904L Forged Flanges
Stainless Steel 904L Socket weld Flanges
Stainless Steel 904L Slip on Flanges
Stainless Steel 904L BLRF Flanges
Stainless Steel 904L RTJ Flanges
Stainless Steel 904L Long weld Neck Flanges
Stainless Steel 904L Forged Flanges
Stainless Steel 904L Threaded Flanges
Stainless Steel 904L Weld Neck Flanges
Stainless Steel 904L Forged Flanges Chemical Composition
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | Ti | Fe | |
| 904L | min. | 18.0 | 8.0 | |||||||||
| max. | 0.08 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | 0.10 | ||||
| 904LL | min. | 18.0 | 8.0 | |||||||||
| max. | 0.030 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 12.0 | 0.10 | ||||
| 904LH | min. | 0.04 | 18.0 | 8.0 | ||||||||
| max. | 0.010 | 2.0 | 0.75 | 0.045 | 0.030 | 20.0 | 10.5 | |||||
| 316 | min. | 16.0 | 2.03.0 | 10.0 | ||||||||
| max. | 0.035 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0 | 14.0 | |||||
| 316L | min. | 16.0 | 2.03.0 | 10.0 | ||||||||
| max. | 0.035 | 2.0 | 0.75 | 0.045 | 0.030 | 18.0 | 14.0 | |||||
| 316TI | 0.08 max | 10.00 14.00 | 2.0 max | 0.045 max | 0.030 max | 16.00 18.00 | 0.75 max | 2.00 3.00 | ||||
| 317 | 0.08 max | 2 max | 1 max | 0.045 max | 0.030 max | 18.00 20.00 | 3.00 4.00 | 57.845 min | ||||
| SS 317L | 0.035 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 18.00 20.00 | 3.00 4.00 | 11.00 15.00 | 57.89 min | |||
| SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 19.00 | 9.00 12.00 | 0.10 max | 5(C+N) 0.70 max | |||
| SS 321H | 0.04 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 19.00 | 9.00 12.00 | 0.10 max | 4(C+N) 0.70 max | |||
| 347/ 347H | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 20.00 | 9.0013.00 | |||||
| 410 | min. | 11.5 | ||||||||||
| max. | 0.15 | 1.0 | 1.00 | 0.040 | 0.030 | 13.5 | 0.75 | |||||
| 446 | min. | 23.0 | 0.10 | |||||||||
| max. | 0.2 | 1.5 | 0.75 | 0.040 | 0.030 | 30.0 | 0.50 | 0.25 | ||||
| 904L | min. | 19.0 | 4.00 | 23.00 | 0.10 | |||||||
| max. | 0.20 | 2.00 | 1.00 | 0.045 | 0.035 | 23.0 | 5.00 | 28.00 | 0.25 | |||
Stainless Steel 904L Forged Flanges Mechanical Properties
| Grade | Elongation | Density | Yield Strength (0.2%Offset) | Melting Point | Tensile Strength |
| 904L/904LL | 35 % | 8.0 g/cm3 | Psi 30000 , MPa 205 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 |
| 904LH | 40 % | 8.0 g/cm3 | Psi 30000 , MPa 205 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 |
| 310 / 310S / 310H | 40 % | 7.9 g/cm3 | Psi 30000 , MPa 205 | 1402 °C (2555 °F) | Psi 75000 , MPa 515 |
| 904L/ 316H | 35 % | 8.0 g/cm3 | Psi 30000 , MPa 205 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 |
| 316L | 35 % | 8.0 g/cm3 | Psi 30000 , MPa 205 | 1399 °C (2550 °F) | Psi 75000 , MPa 515 |
| 317 | 35 % | 7.9 g/cm3 | Psi 30000 , MPa 205 | 1400 °C (2550 °F) | Psi 75000 , MPa 515 |
| 321 | 35 % | 8.0 g/cm3 | Psi 30000 , MPa 205 | 1457 °C (2650 °F) | Psi 75000 , MPa 515 |
| 347 | 35 % | 8.0 g/cm3 | Psi 30000 , MPa 205 | 1454 °C (2650 °F) | Psi 75000 , MPa 515 |
| 904L | 35 % | 7.95 g/cm3 | Psi 32000 , MPa 220 | 1350 °C (2460 °F) | Psi 71000 , MPa 490 |
Looking to buy Stainless Steel 904L Forged Flanges From a manufacturer in India?
Stainless Steel 904L Forged Flanges Equivalent
| STANDARD | AFNOR | UNS | EN | JIS | BS | WERKSTOFF NR. | COST |
| 904L | Z7CN18‐09 | S904L00 | X5CrNi18-10 | SUS 904L | 904LS31 | 1.4301 | 08Х18Н10 |
| 904 | Z3CN18‐10 | S904L03 | X2CrNi18-9 / X2CrNi19-11 | SUS 904LL | 3904LS11 | 1.4904L / 1.4307 | 03Х18Н11 |
| 904H | – | S904L09 | – | – | – | 1.4301 | – |
| 310 | – | S31000 | X15CrNi25-20 | SUS 310 | 310S24 | 1.4841 | 20Ch25N20S2 |
| 310S | – | S31008 | X8CrNi25-21 | SUS 310S | 310S16 | 1.4845 | 20Ch23N18 |
| 310H | – | S31009 | – | – | – | – | – |
| 316 | Z7CND17‐11‐02 | S31600 | X5CrNiMo17-12-2 / X3CrNiMo17-13-3 | SUS 316 | 316S31 / 316S33 | 1.4401 / 1.4436 | – |
| 316L | Z3CND17‐11‐02 / Z3CND18‐14‐03 | S31603 | X2CrNiMo17-12-2 / X2CrNiMo18-14-3 | SUS 316L | 316S11 / 316S13 | 1.4404 / 1.4435 | 03Ch17N14M3 / 03Ch17N14M2 |
| 316H | – | S31609 | – | – | – | 1.4401 | – |
| 316Ti | Z6 CNDT 17‐123 | S31635 | X6CrNiMoTi17-12-2 | SUS 316Ti | 320S31 | 1.4571 | 08Ch17N13M2T |
| 317 | – | S31700 | – | SUS 317 | – | 1.4449 | – |
| 317L | – | S31703 | X2CrNiMo18-15-4 | SUS 317L | – | 1.4438 | – |
| 321 | – | S32100 | X6CrNiTi18-10 | SUS 321 | – | 1.4541 | – |
| 321H | – | S32109 | X12CrNiTi18-9 | SUS 321H | – | 1.4878 | – |
| 347 | – | S34700 | X6CrNiNb18-10 | SUS 347 | – | 1.4550 | 08Ch18N12B |
| 347H | – | S34709 | X6CrNiNb18-12 | SUS 347H | – | 1.4961 | – |
| 904L | Z2 NCDU 25-20 | N08904 | X1NiCrMoCu25-20-5 | SUS 904L | 904S13 | 1.4539 | STS 317J5L |
Please note this is an approx Stainless Steel 904L Forged Flanges price in India. For final Stainless Steel 904L Forged Flanges price list please mail us.
Weight Of Stainless Steel 904L Forged Flanges
| NPS (Nominal Pipe Size) | Loose (Lap Joint) | NPT (Threaded) | SORF (Slip-On) | BLRF (Blind) | SWRF (Socket Weld) | WRNR (Weld Neck) |
| ½ | 1 | 1 | 1 | 2 | 2 | 2 |
| 1 | 2 | 2 | 2 | 2 | 2 | 3 |
| 1¼ | 3 | 3 | 3 | 3 | 3 | 3 |
| ¾ | 2 | 2 | 2 | 2 | 2 | 2 |
| 1½ | 3 | 3 | 3 | 4 | 3 | 4 |
| 2½ | 8 | 8 | 8 | 7 | 8 | 10 |
| 2 | 5 | 5 | 5 | 5 | 5 | 6 |
| 3 | 9 | 9 | 9 | 9 | 9 | 11.5 |
| 4 | 13 | 13 | 13 | 17 | 13 | 16.5 |
| 3½ | 11 | 12 | 11 | 13 | 11 | 12 |
| 5 | 15 | 15 | 15 | 20 | 15 | 21 |
| 8 | 30 | 30 | 30 | 47 | 30 | 42 |
| 6 | 19 | 19 | 19 | 27 | 19 | 26 |
| 10 | 43 | 43 | 43 | 70 | 43 | 54 |
| 24 | 275 | 220 | 220 | 430 | 220 | 268 |
| 14 | 105 | 90 | 90 | 140 | 90 | 114 |
| 12 | 64 | 64 | 64 | 123 | 64 | 88 |
| 16 | 140 | 98 | 106 | 180 | 98 | 140 |
| 20 | 195 | 165 | 165 | 285 | 165 | 197 |
| 18 | 160 | 130 | 130 | 220 | 130 | 165 |
| 22 | 245 | 185 | 185 | 355 | 185 | 225 |
Stainless Steel 904L Forged Flanges Pressure And Temperature Ratings
| Temperature °F | Class 150 | Class 600 | Class 1500 | Class 400 | Class 900 | Class 300 | Class 2500 |
| -20 to 100 | 275 | 1440 | 3600 | 960 | 2160 | 720 | 6000 |
| 300 | 205 | 1080 | 2700 | 720 | 1620 | 540 | 4500 |
| 200 | 230 | 1200 | 3000 | 800 | 1800 | 600 | 5000 |
| 400 | 190 | 995 | 2485 | 660 | 1490 | 495 | 4140 |
| 600 | 140 | 875 | 2185 | 580 | 1310 | 435 | 3640 |
| 650 | 125 | 860 | 2150 | 575 | 1290 | 430 | 3580 |
| 500 | 170 | 930 | 2330 | 620 | 1395 | 465 | 3880 |
| 700 | 110 | 850 | 2125 | 565 | 1275 | 425 | 3540 |
| 750 | 95 | 830 | 2075 | 555 | 1245 | 415 | 3460 |
| 850 | 65 | 790 | 1980 | 530 | 1190 | 395 | 3300 |
| 800 | 80 | 805 | 2015 | 540 | 1210 | 405 | 3360 |
| 900 | 50 | 780 | 1945 | 520 | 1165 | 390 | 3240 |
| 950 | 35 | 765 | 1910 | 510 | 1145 | 380 | 3180 |
| 1000 | 20 | 640 | 1605 | 430 | 965 | 320 | 2675 |
| 1100 | 20 | 515 | 1285 | 345 | 770 | 255 | 2145 |
| 1150 | 20 | 400 | 995 | 265 | 595 | 200 | 1655 |
| 1050 | 20 | 615 | 1545 | 410 | 925 | 310 | 2570 |
| 1200 | 20 | 310 | 770 | 205 | 465 | 155 | 1285 |
| 1250 | 20 | 225 | 565 | 150 | 340 | 115 | 945 |
| 1300 | 20 | 170 | 430 | 115 | 255 | 85 | 715 |
| 1400 | 20 | 95 | 240 | 65 | 145 | 50 | 400 |
| 1350 | 20 | 125 | 310 | 80 | 185 | 60 | 515 |
| 1450 | 15 | 70 | 170 | 45 | 105 | 35 | 285 |
| 1500 | 10 | 55 | 135 | 35 | 80 | 25 | 230 |
Key Features of SS 904L Forged Flanges
SS 904L forged flanges resist chloride pitting and stress corrosion cracking in acidic, sulphuric and chloride-rich environments. These are manufactured by Ratna Exports, a reliable flanges supplier as per ASTM A182 & ASME B16.5.
- Contains 4.5% molybdenum and 25% nickel, which helps against pitting and crevice corrosion
- Handles sulphuric acid up to 40% concentration at elevated temperatures
- Available in pressure classes from 150# to 2500#
- Keeps mechanical strength between -100°C and 400°C
- Forged, so there’s no weld seam to worry about under cyclic loading
- Low carbon content (0.02% max) stops sensitisation during welding
Manufacturing & Quality Testing of SS 904L Forged Flanges
Six inspection stages happen before a flange leaves the factory. Each one is checking for something different that could go wrong later.
- Dimensional Inspection: The bore diameter, bolt circle and face flatness are checked to ASME B16.5 tolerances
- PMI Testing: Positive Material Identification confirms the alloy using handheld XRF analysers
- Hydrostatic Testing: Flanges hold at 1.5 times rated working pressure for 30 minutes, no leaks allowed
- Hardness Testing: Rockwell B readings stay within 100 HRB, this confirms the forging held up properly
- Third-Party Inspection: Agencies like Lloyd’s Register and Bureau Veritas can witness critical tests if the client asks
- EN 10204 3.1 Certification: Every batch comes with test reports covering chemical and mechanical properties
Why Buy SS 904L Forged Flanges from Ratna Exports?
Ratna Exports is an ISO 9001:2015 certified manufacturer; we have the required certificates to back every batch produced. Sizes run from ½” NB up to 48″ NB across all standard pressure classes, so most projects won’t need a custom forging just to get the right fit. Exports go out to over 60 countries, with steady orders from the Middle East, Europe, and Southeast Asia. For anything outside standard sizing, non-standard bores, special drilling, or specific surface finishes, custom manufacturing covers it. PMI, hydrostatic, and hardness testing happen on every single batch. Standard sizes are kept in stock and go out within 48 hours. Custom orders usually take 3 to 4 weeks depending on the quantity ordered.
FAQs
Where are SS 904L Forged Flanges commonly used?
Chemical processing plants, sulphuric acid units, seawater desalination systems, and flue gas desulphurisation lines. All of these deal with acidic or chloride-heavy conditions where this grade holds up.
Are 904L Forged Flanges suitable for seawater applications?
Yes, the molybdenum and nickel content keeps chloride pitting under control. Offshore platforms and seawater cooling systems both use this grade for that reason.
Which pressure classes are available?
The available pressure classes are 150#, 300#, 600#, 900#, 1500#, and 2500#, all tested to ASME B16.5 specifications.
Do you provide Mill Test Certificates?
Yes. Each delivery is accompanied by a certificate of chemical composition and mechanical properties according to EN 10204 3.1.
Applications Industry Stainless Steel 904L Forged Flanges
- Pharmaceutical Industry
- Oil Refineries
- Textile Industries
- Nuclear Plants
- Chemical Industries
- Power Plant
- Petrochemicals Industry
- Sugar Industry
- Engineering Industry
- Chemical Industry
- Food Industry
- Marine Industry
