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Stainless Steel 304H Flanges can be used in situations where there is exposure to high temperatures and high pressures, where durability and corrosion resistance are critical performance requirements. High carbon alloy ASTM A182 F304H forged stainless steel with 18-20% chromium and 8-11% nickel providing high creep strength and high-temperature properties. The minimum tensile strength of 515MPa and minimum yield strength of 205MPa ensures that the demands of tough working conditions in refineries, petrochemical industries, power generation plants and heat exchange equipment are met. Solitaire Overseas is the most trusted manufacturer and supplier of Stainless Steel 304H Flanges in India. We have different varieties of flanges that come in different pressure classes, sizes, and face styles conforming to ASME B16.5, ASME B16.47 & ASTM A182 standards. Known for their exceptional weldability and oxidation resistance.
Get a Free Quote for Stainless Steel 304H Flanges →| Category | Specification Details |
|---|---|
| Size & Dimensions | NPS: 1/2" to 48" (Custom sizes available) Schedule (SCH): Sch 5 to XXS |
| Pressure Class | 150# to 2500# |
| Standards | ASME B16.5, ASME B16.47 Series A & B, ASTM A182 / ASME SA 182, MSS SP44 |
| Flange Types | Weld Neck, Slip On, Blind, Socket Weld, Reducing, Spectacle Blind, Square, Orifice, High Hub Blind |
| Flange Faces | RF (Raised Face), FF (Flat Face), RTJ (Ring Type Joint), T & G (Tongue and Groove) |
| Surface Finish | Smooth, Serrated, Spiral/Concentric, Mirror |
| Manufacturing Process | Forging, Casting, Rolling, Cutting |
| Threads | NPT, FNPT, MNPT, BSPT, BSPP |
| Testing & Inspection | Mechanical/Chemical: Hardness test, Tensile, PMI (Positive Material Identification) Destructive/Non-Destructive: Hydro test, Pressure test, NDT, X-ray Detector |
| Material/Components | Flange Bolts, Gasket, Ring Joint |
| Key Advantages | Excellent oxidation resistance up to 870°C; superior creep strength vs standard 304; good ductility and formability |
| Origin / Sourcing | Indian, European, Japan, Korean |
| Element | Carbon (C) | Silicon (Si) | Sulfur (S) | Phosphorus (P) | Manganese (Mn) | Chromium (Cr) | Nitrogen | Nickel (Ni) |
|---|---|---|---|---|---|---|---|---|
| Value (wt%) | 0.10 max | 0.75 max | 0.03 max | 0.045 max | 2.0 max | 18.0 – 20.0 | 0.10 max | 8.0–10.5% |
| Property | Melting Point | Yield Strength (0.2% Offset) | Density | Tensile Strength | Elongation |
|---|---|---|---|---|---|
| Value | 1400 °C (2550 °F) | 30,000 Psi / 205 MPa | 8.0 g/cm³ | 75,000 Psi / 515 MPa | 30% min |
| Forging Grade | North America (UNS) | Germany (DIN) | Europe (EN) | Japan (JIS) | Russia (GOST) | ISO | France (AFNOR) |
|---|---|---|---|---|---|---|---|
| ASTM A182 F304H | UNS S30409 | 1.4948 | X6CrNi18-11 | SUS 304H | 08KH18N10 | X7CrNi18-9 | Z6CN18-09 |
| Temperature (°F) | 150# | 300# | 400# | 600# | 900# | 1500# | 2500# |
|---|---|---|---|---|---|---|---|
| -20 to 100 | 275 | 720 | 960 | 1440 | 2160 | 3600 | 6000 |
| 200 | 230 | 600 | 800 | 1200 | 1800 | 3000 | 5000 |
| 300 | 205 | 540 | 720 | 1080 | 1620 | 2700 | 4500 |
| 400 | 190 | 495 | 660 | 995 | 1490 | 2485 | 4140 |
| 500 | 170 | 465 | 620 | 930 | 1395 | 2330 | 3880 |
| 600 | 140 | 435 | 580 | 875 | 1310 | 2185 | 3640 |
| 650 | 125 | 430 | 575 | 860 | 1290 | 2150 | 3580 |
| 700 | 110 | 425 | 565 | 850 | 1275 | 2125 | 3540 |
| 750 | 95 | 415 | 555 | 830 | 1245 | 2075 | 3460 |
| 800 | 80 | 405 | 540 | 805 | 1210 | 2015 | 3360 |
| 850 | 65 | 395 | 530 | 790 | 1190 | 1980 | 3300 |
| 900 | 50 | 390 | 520 | 780 | 1165 | 1945 | 3240 |
| 950 | 35 | 380 | 510 | 765 | 1145 | 1910 | 3180 |
| 1000 | 20 | 320 | 430 | 640 | 965 | 1605 | 2675 |
| 1050 | 20 | 310 | 410 | 615 | 925 | 1545 | 2570 |
| 1100 | 20 | 255 | 345 | 515 | 770 | 1285 | 2145 |
| 1150 | 20 | 200 | 265 | 400 | 595 | 995 | 1655 |
| 1200 | 20 | 155 | 205 | 310 | 465 | 770 | 1285 |
| 1250 | 20 | 115 | 150 | 225 | 340 | 565 | 945 |
| 1300 | 20 | 85 | 115 | 170 | 255 | 430 | 715 |
| 1350 | 20 | 60 | 80 | 125 | 185 | 310 | 515 |
| 1400 | 20 | 50 | 65 | 95 | 145 | 240 | 400 |
| 1450 | 15 | 35 | 45 | 70 | 105 | 170 | 285 |
| 1500 | 10 | 25 | 35 | 55 | 80 | 135 | 230 |
| Standard | Class / Table | Bolt Circle Dia (mm/in) | Flange Dia (mm/in) | Bolt Size | No. of Bolts | Dia of Bolt Hole (mm/in) |
|---|---|---|---|---|---|---|
| AS 2129 Flange | Table C | 67 | 95 | 13 | 4 | 14 |
| Table D | 67 | 95 | 13 | 4 | 14 | |
| Table E | 67 | 95 | 13 | 4 | 14 | |
| Table F | 67 | 95 | 13 | 4 | 14 | |
| Table H | 83 | 114 | 16 | 4 | 17 | |
| Table J | 83 | 114 | 16 | 4 | 17 | |
| ISO 7005 (DIN) | PN6 | 55 | 80 | M10 | 4 | 11 |
| PN10 | 65 | 95 | M12 | 4 | 14 | |
| PN16 | 65 | 95 | M12 | 4 | 14 | |
| PN20 | 60.5 | 90 | M14 | 4 | 16 | |
| PN25 | 65 | 95 | M12 | 4 | 14 | |
| PN40 | 65 | 95 | M12 | 4 | 14 | |
| AS4087 | PN14 | 67 | 95 | M12 | 4 | 14 |
| ANSI B16.5 | ANSI 150 | 60 | 89 | 13 | 4 | 16 |
| ANSI 300 | 67 | 95 | 13 | 4 | 16 | |
| ANSI 600 | 67 | 95 | 13 | 4 | 16 | |
| ANSI 900 | 83 | 121 | 19 | 4 | 22 | |
| ANSI 1500 | 83 | 121 | 19 | 4 | 22 |
| Nom Pipe Size (NPS) | Outside Diameter (OD) | Sch 20 | Sch 10 | Sch 30 | Sch 40 | STD Wall | EXT Hvy | Sch 80 |
|---|---|---|---|---|---|---|---|---|
| 1/2" | 0.840 | — | 0.083 | — | 0.109 | 0.109 | 0.147 | 0.147 |
| 3/4" | 1.050 | — | 0.083 | — | 0.113 | 0.113 | 0.154 | 0.154 |
| 1" | 1.315 | — | 0.109 | — | 0.133 | 0.133 | 0.179 | 0.179 |
| 1 1/4" | 1.660 | — | 0.109 | — | 0.140 | 0.140 | 0.191 | 0.191 |
| 1 1/2" | 1.900 | — | 0.109 | — | 0.145 | 0.145 | 0.200 | 0.200 |
| 2" | 2.375 | — | 0.109 | — | 0.154 | 0.154 | 0.218 | 0.218 |
| 2 1/2" | 2.875 | — | 0.120 | — | 0.203 | 0.203 | 0.276 | 0.276 |
| 3" | 3.500 | — | 0.120 | — | 0.216 | 0.216 | 0.300 | 0.300 |
| 3 1/2" | 4.000 | — | 0.120 | — | 0.226 | 0.226 | 0.318 | 0.318 |
| 4" | 4.500 | — | 0.120 | — | 0.237 | 0.237 | 0.337 | 0.337 |
| 5" | 5.563 | — | 0.134 | — | 0.258 | 0.258 | 0.375 | 0.375 |
| 6" | 6.625 | — | 0.134 | — | 0.280 | 0.280 | 0.432 | 0.432 |
| 8" | 8.625 | 0.250 | 0.148 | 0.277 | 0.322 | 0.322 | 0.500 | 0.512 |
| 10" | 10.750 | 0.250 | 0.165 | 0.307 | 0.365 | 0.365 | 0.500 | 0.594 |
| 12" | 12.750 | 0.250 | 0.180 | 0.330 | 0.406 | 0.375 | 0.500 | 0.688 |
| 14" | 14.000 | 0.312 | 0.250 | 0.375 | 0.438 | 0.375 | 0.500 | 0.750 |
| 16" | 16.000 | 0.312 | 0.250 | 0.375 | 0.500 | 0.375 | 0.500 | 0.844 |
| 18" | 18.000 | 0.312 | 0.250 | 0.438 | 0.562 | 0.375 | 0.500 | 0.938 |
| 22" | 22.000 | — | 0.250 | — | — | 0.375 | 0.500 | — |
304H Stainless Steel Forged Flanges are pipe connection components made from ASTM A182 F304H stainless steel. They are designed for high-temperature and high-pressure applications and offer excellent strength and durability.
The main difference is carbon content. 304H contains a higher carbon content than standard 304 stainless steel, which improves its strength and creep resistance at elevated temperatures.
Yes, 304H forged flanges have good weldability and can be welded using standard stainless steel welding methods. Proper welding procedures help maintain their performance and corrosion resistance.
304H flanges are used in high-temperature environments because their higher carbon content provides better strength, oxidation resistance, and creep resistance at elevated temperatures.
Yes, 304H forged flanges offer good corrosion resistance against many industrial chemicals, moisture, and atmospheric conditions, making them suitable for a wide range of applications.