The 5 Inch Weld Neck Flange (NPS 5″ | DN125) is a forged, heavy-duty flange designed for high-pressure and high-temperature piping systems. Engineered with a long tapered hub, this flange is butt-welded directly to the pipe, ensuring excellent stress distribution and structural reinforcement. Its smooth bore transition minimizes turbulence and erosion, providing enhanced durability and leak-resistant performance in critical service conditions.
Manufactured in compliance with ASME B16.5, the 5″ Weld Neck Flange is available in pressure ratings ranging from Class 150 to Class 2500, depending on operational requirements. It is produced in various material grades including Stainless Steel (ASTM A182 F304, F304L, F316, F316L, F321, F347), Carbon Steel (ASTM A105, A350 LF2), Alloy Steel (F11, F22, F5, F9), Duplex & Super Duplex grades, and Nickel Alloys to ensure strength, corrosion resistance, and long service life.
The standard face type is Raised Face (RF), with optional Flat Face (FF) and Ring Type Joint (RTJ) for high-pressure sealing applications. Each flange undergoes strict quality inspection and can be supplied with Mill Test Certification (EN 10204 3.1).
The 5 Inch Weld Neck Flange is widely used in oil & gas, petrochemical, power generation, marine, and chemical processing industries.
Our Steel Grades
Austenitic
| Grade | USA | Japan | Germany | UK | France | Sweden | China | |
|---|---|---|---|---|---|---|---|---|
| ANSI/ASME | JIS | DIN | BS | EN | AFNOR | SS | GB | |
| 304 | AISI 304 | SUS 304 | 1.4301 | 304S31 | X5CrNi18-10 | Z6CN18-09 | 2337 | 0Cr18Ni9 |
| 304L | AISI 304L | SUS 304L | 1.4306 | 304S11 | X2CrNi19-11 | - | 1.4306 | 00Cr19Ni10 |
| 304H | AISI 304H | SUS 304H | 1.4301H | 1.4301H | 304S41 | X5CrNi18-10 | - | 0Cr18Ni9H |
| 316 | AISI 316 | SUS 316 | 1.4401 | 316S31 | X5CrNiMo17-12-2 | Z6CNMo17-12-2 | 1.4401 | 0Cr17Ni12Mo2 |
| 316L | AISI 316L | SUS 316L | 1.4404 | 316S11 | X2CrNiMo17-12-2 | - | 1.4404 | 00Cr17Ni12Mo2 |
| 303 | AISI 303 | SUS 303 | 1.4305 | 303S31 | X8CrNiS18-9 | - | 1.4305 | 0Cr17Ni12 |
| 309 | AISI 309 | SUS 309 | 1.4828 | 309S31 | X15CrNi25-20 | - | 1.4828 | - |
| 309S | AISI 309S | SUS 309S | 1.4833 | 309S31 | X15CrNi25-20 | - | 1.4833 | - |
| 309H | AISI 309H | SUS 309H | 1.4833 | 309H31 | X15CrNi25-20 | - | 1.4833 | - |
| 310 | AISI 310 | SUS 310 | 1.4841 | 310S31 | X15CrNi25-20 | - | 1.4841 | - |
| 310S | AISI 310S | SUS 310S | 1.4841 | 310S31 | X15CrNi25-20 | - | 1.4841 | - |
| 310H | AISI 310H | SUS 310H | 1.4845 | 310H31 | X15CrNi25-20 | - | 1.4845 | - |
| 317 | AISI 317 | SUS 317 | 1.4449 | 317S31 | X6CrNiMoTi17-12-2 | - | 1.4449 | - |
| 317L | AISI 317L | SUS 317L | 1.4438 | 317S11 | X2CrNiMo17-12-2 | - | 1.4438 | - |
| 317LMN | AISI 317LMN | - | 1.4438 | - | X2CrNiMoN17-12-2 | - | 1.4438 | - |
| 321 | AISI 321 | SUS 321 | 1.4541 | 321S31 | X6CrNiTi18-10 | Z6CnTi18-10 | 1.4541 | 1Cr18Ni11Ti |
| 321H | AISI 321H | SUS 321H | 1.4541H | 321H31 | X6CrNiTi18-10 | - | 1.4541H | 1Cr18Ni11TiH |
| 347 | AISI 347 | SUS 347 | 1.455 | 347S31 | X6CrNiNb18-10 | Z6CnNb18-10 | 1.455 | 1Cr18Ni11Nb |
| 347H | AISI 347H | SUS 347H | 1.4550H | 347H31 | X6CrNiNb18-10 | - | 1.4550H | 1Cr18Ni11NbH |
Ferritic, Martensitic, Duplex, Precipitation Hardening
| Grade | USA | Japan | Germany | UK | France | Sweden | China | |
|---|---|---|---|---|---|---|---|---|
| ANSI/ASME | JIS | DIN | BS | EN | AFNOR | SS | GB | |
| 430 | AISI 430 | SUS 430 | 1.4016 | 430S17 | X12Cr17 | Z10CD17 | 1.4016 | 1Cr17 |
| 434 | AISI 434 | SUS 434 | 1.4112 | 434S17 | X15CrNiSi20-12 | – | 1.4112 | 1Cr18Si19 |
| 436 | AISI 436 | SUS 436 | 1.4112 | 436S21 | X3Cr12 | – | 1.4112 | 1Cr12 |
| 444 | AISI 444 | SUS 444 | 1.4521 | 444S23 | X2CrTi12 | – | 1.4521 | 0Cr18Ti12 |
| 409 | AISI 409 | SUS 409 | 1.4512 | 409S17 | X8Cr17 | Z10CD17 | 1.4512 | 1Cr17 |
| 409L | AISI 409L | SUS 409L | 1.4512L | 409L | X8Cr17 | – | 1.4512L | 1Cr17L |
| 410 | AISI 410 | SUS 410 | 1.4006 | 410S21 | X20Cr13 | Z20CD13 | 1.4006 | 1Cr13 |
| 420 | AISI 420 | SUS 420 | 1.4021 | 420S29 | X20Cr13 | Z20CD13 | 1.4021 | 1Cr13 |
| 431 | AISI 431 | SUS 431 | 1.4057 | 431S29 | X12CrMoV12-3 | – | 1.4057 | 1Cr13MoV |
| 440A | AISI 440A | SUS 440A | 1.4115 | 440S38 | X50CrMoV15 | – | 1.4115 | 1Cr15MoV |
| 440B | AISI 440B | SUS 440B | 1.4418 | 440S40 | X55CrMoV14 | – | 1.4418 | 1Cr17MoV |
| 440C | AISI 440C | SUS 440C | 1.4125 | 440S45 | X65Cr13 | – | 1.4125 | 1Cr18Mo |
| 2205 | AISI 2205 | SUS 2205 | 1.4462 | 2205S32 | X2CrNiMoN22-5-3 | Z3CN22-5-3 | 1.4462 | – |
| 2507 | AISI 2507 | SUS 2507 | 1.441 | 2507S32 | X2CrNiMoCu25-7-4 | Z6CN25-7-4 | 1.441 | – |
| 2304 | AISI 2304 | SUS 2304 | 1.4362 | 2304S31 | X2CrNiMoN21-5-2 | – | 1.4362 | – |
| 904L | AISI 904L | SUS 904L | 1.4539 | 904S13 | X1NiCrMoCu25-20-5 | Z6CND25-20-5 | 1.4539 | – |
| LDX 2101 | – | – | 1.4162 | LDX | X2CrNiN22-5-2 | – | 1.4162 | – |
| S32205 | – | – | 1.4462 | S32205 | X2CrNiMoN22-5-3 | – | 1.4462 | – |
| 17-4 PH | AISI 17-4 PH | SUS 17-4 PH | 1.4542 | 17-4 PH | X5CrNiCuNb16-4 | Z5CNCuNb16-4 | 1.4542 | – |
| 15-5 PH | AISI 15-5 PH | SUS 15-5 PH | 1.4545 | 15-5 PH | X5CrNiCuNb15-4 | Z5CNCuNb15-4 | 1.4545 | – |
| 13-8 Mo | AISI 13-8 Mo | SUS 13-8 Mo | 1.4548 | 13-8 Mo | X4CrNiMo16-5-1 | Z4CNiMo16-5-1 | 1.4548 | – |
| 17-7 PH | AISI 17-7 PH | SUS 17-7 PH | 1.4568 | 17-7 PH | X7CrNiAl17-7 | Z7CNiAl17-7 | 1.4568 | – |
| 2507 | AISI 2507 | SUS 2507 | 1.441 | 2507S32 | X2CrNiMoCu25-7-4 | Z6CN25-7-4 | 1.441 | – |
Carbon Steel
| USA (AISI/SAE) | Japan (JIS) | Germany (W-nr) | DIN | BS (UK) | Europe (EN) | France (AFNOR) | Italy (UNI) | Sweden (SS) | China (GB) |
|---|---|---|---|---|---|---|---|---|---|
| A36 | SS400 | 1.0117 | St37-2 | 40EE | S235J2 | A37-2 | Fe360B | 17100 | Q235B |
| 1015 | SM400A | 1.0038 | RSt37-2 | 40A | S235JR | E24-2 | Fe360B | 1311 | Q235A |
| 1035 | S35C | 1.0501 | C35 | 070M36 | C35 | AF55C35 | C35 | 1550 | 35 |
| 12L14 | SUM24L | 1.0736 | 9SMnPb28 | 230M07Pb | 11SMnPb30 | - | AVZ | 1914 | Y12Pb |
| A105 LF2 | SF440A | 1.046 | C22.8 | 161-360A | P250GH | C22.8 | C21 | - | 20MnK |
| 55 | S55C | 1.0535 | C55 | 070M55 | C55 | XC55 | C55 | 1655 | 55 |
| 1042/1045 | S45C | 1.0503 | C45 | 070M46 | Ck42 | AF65C45 | C45 | 1650 | 40 |
| 1040/1038 | S40C | 1.0511 | C40 | 080M40 | C40 | AF60C40 | C40 | 1671 | 40 |
| 1050 | S50C | 1.054 | C50 | 080A52 | C50 | XC48H1 | C50 | 1674 | 50 |
| 4130 | SCM430 | 1.7218 | 25CrMo4 | 708A25 | 25CrMo4 | 25CD4 | 25CrMo4 | 2244 | 30CrMo |
| A283 Gr.CSS330 | 1.0038 | 1.0038 | St37-2 | 43C | S185 | A33-3 | Fe320 | 17100 | Q235C |
| A572 Gr.50SM490A | 1.0545 | 1.0545 | S355J2G3 | 50D | S355JR | Fe510D | 1872 | Q345B | Q345B |
| 4140 | SCM440 | 1.7225 | 42CrMoS4 | 708M40 | 42CrMoS4 | 42CD4u | 42CrMo4 | 2244 | 42CrMo |
| 4340 | SNCM439 | 1.6582 | 34CrNiMo6V | 817M40 | 34CrNiMo6 | 35NCD6 | 35NiCrMo6KB | 2541 | ZG34CrNiMo |
| 5160 | SUP9 | 1.1777 | 51CrV4 | 251A58 | 51CrV4 | 51CDV4 | 50CrV4 | 2551 | 60CrMnV |
| 8620 | SNCM220 | 1.6523 | 20CrNiMo2 | 805M20 | 20NiCrMo2 | 20NCD2 | 20CrNiMo | 2258 | 20CrNiMo |
| 300M | - | 1.6957 | 43CrNiMo8-6-4 | - | 40NiCrMo8-4-4 | 40CNCD8-6 | - | - | 40CrNiMo |
| USA (AISI/SAE) | Japan (JIS) | Germany (W-nr) | DIN | BS (UK) | Europe (EN) | France (AFNOR) | Italy (UNI) | Sweden (SS) | China (GB) |
|---|---|---|---|---|---|---|---|---|---|
| A36 | SS400 | 1.0117 | St37-2 | 40EE | S235J2 | A37-2 | Fe360B | 17100 | Q235B |
| 1015 | SM400A | 1.0038 | RSt37-2 | 40A | S235JR | E24-2 | Fe360B | 1311 | Q235A |
| 1035 | S35C | 1.0501 | C35 | 070M36 | C35 | AF55C35 | C35 | 1550 | 35 |
| 12L14 | SUM24L | 1.0736 | 9SMnPb28 | 230M07Pb | 11SMnPb30 | - | AVZ | 1914 | Y12Pb |
| A105 LF2 | SF440A | 1.046 | C22.8 | 161-360A | P250GH | C22.8 | C21 | - | 20MnK |
| 55 | S55C | 1.0535 | C55 | 070M55 | C55 | XC55 | C55 | 1655 | 55 |
| 1042/1045 | S45C | 1.0503 | C45 | 070M46 | Ck42 | AF65C45 | C45 | 1650 | 40 |
| 1040/1038 | S40C | 1.0511 | C40 | 080M40 | C40 | AF60C40 | C40 | 1671 | 40 |
| 1050 | S50C | 1.054 | C50 | 080A52 | C50 | XC48H1 | C50 | 1674 | 50 |
| 4130 | SCM430 | 1.7218 | 25CrMo4 | 708A25 | 25CrMo4 | 25CD4 | 25CrMo4 | 2244 | 30CrMo |
| A283 Gr.CSS330 | 1.0038 | 1.0038 | St37-2 | 43C | S185 | A33-3 | Fe320 | 17100 | Q235C |
| A572 Gr.50SM490A | 1.0545 | 1.0545 | S355J2G3 | 50D | S355JR | Fe510D | 1872 | Q345B | Q345B |
| 4140 | SCM440 | 1.7225 | 42CrMoS4 | 708M40 | 42CrMoS4 | 42CD4u | 42CrMo4 | 2244 | 42CrMo |
| 4340 | SNCM439 | 1.6582 | 34CrNiMo6V | 817M40 | 34CrNiMo6 | 35NCD6 | 35NiCrMo6KB | 2541 | ZG34CrNiMo |
| 5160 | SUP9 | 1.1777 | 51CrV4 | 251A58 | 51CrV4 | 51CDV4 | 50CrV4 | 2551 | 60CrMnV |
| 8620 | SNCM220 | 1.6523 | 20CrNiMo2 | 805M20 | 20NiCrMo2 | 20NCD2 | 20CrNiMo | 2258 | 20CrNiMo |
| 300M | - | 1.6957 | 43CrNiMo8-6-4 | - | 40NiCrMo8-4-4 | 40CNCD8-6 | - | - | 40CrNiMo |
| 4130 | SCM420 | 1.7218 | 25CrMo4 | 708A25 | 25CrMo4 | - | 25CrMo4 | 2142 | 30CrMo |
| 4140/4142 | SCM440H | 1.7225 | 42CrMo4 | 708M40 | 42CrMo4 | 42CD4 | 42CrMo4 | 2244 | 42CrMo |
| 4340 | SNCM447 | 1.6582 | 34CrNiMo6 | 817M40 | 34CrNiMo6 | 35NCD6 | 35CrNiMo6 | 2541 | 34CrNi3Mo |
| 8620 | SNCM220 | 1.6523/- | 20NiCrMo2-2 | 805A20 | 20NiCrMo2-2 | 20NCD2 | 20NiCrMo2 | 2520 | 20CrNiMo |
| 52100 | SUJ2 | 1.2067 | 100Cr6 | 534A99 | 102Cr6 | 100Cr6 | 100Cr6 | 2258 | GCr15 |
| 5140 | SCR440 | 1.7035 | 41Cr4 | 530M40 | 41Cr4 | 41CD4 | 41Cr4 | 2241 | 40Cr |
| 6150 | SCRV50 | 1.8159 | 50CrV4 | 735A50 | 51CrV4 | 50CV4 | 50CrV4 | 2230 | 50CrVA |
| 8627 | SNCM220 | - | - | - | - | - | - | - | - |
| 1527 | SCMn2 | 1.0401 | 28Mn6 | 120M36 | 28Mn6 | 35Mn5 | C28Mn | 1370 | 30Mn2 |
| 5120 | SCM220 | 1.7027 | 20Cr4 | 530M20 | 20Cr4 | 20CD4 | 20Cr4 | 2252 | 20CrMn |
| 8622 | SNCM220 | - | - | - | - | - | - | - | - |
| 4320 | SNCM420 | 1.6523 | 20NiCrMo2-2 | 805M20 | 20NiCrMo2-2 | 20NCD2 | 20NiCrMo2 | - | 20CrNiMo |
| 5015 | SCR415 | 1.7015 | 15Cr3 | 530M15 | 15Cr3 | - | - | 2115 | 15CrMn |
| 5130 | SCR430 | 1.7176 | 30Cr4 | 530M30 | 30Cr4 | - | - | - | 30CrMnSi |
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