Stainless Steel 304H Flanges Manufacturer in India
The high-carbon variant of 304 stainless steel is SS 304H that is designed specifically to be used in high-pressure and high-temperature conditions. As the amount of carbon increases, SS 304H will be able to provide greater creep strength, tensile stability, and thermal resistance, thus suitable in systems that will be under continuous heat stress. The grade is extensively applied in the power plants, refineries, boilers, petrochemical units, and thermal process industries, in which the long-term service at high temperatures is essential. SS 304H flanges are a broadly used product that offers high structural integrity, pressure, and oxidation protection and has proven to be a reliable, leak-free system used in high-pressure industrial piping.
Table of Contents
- What Are SS 304H Flanges?
- Specification of SS 304H Flanges
- Chemical Composition Of ASTM A182 Gr F304H Flanges
- Mechanical Properties of SS 304H Flanges
- ASTM 304H Flange Size Chart
- Pressure Rating Chart of ASME SA182 F304H Weld Neck Flanges
- Schedule Chart of INOX 304H Blind Flange
- Equivalent Standard Of 304H SS BLRF Flanges
- Types of SS 304H Flanges
- Applications and industrial uses of SS 304H Flanges
- Price list of SS 304H Flanges
- Frequently Asked Questions (FAQ)
What Are SS 304H Flanges?
SS 304H Flanges are manufactured connectors of pipe made out of high-carbon austenitic stainless steel, and produced as per the specifications of ASTM A182 F304H. The H designation implies more carbon content (0.04 percent to 0.10 percent), which is more beneficial to high-temperature strength and creep resistance than the standard 304 and 304L grades. The flanges are particularly intended to serve in high-temperature service conditions where mechanical stability and metallurgical strength need to be sustained throughout extended operating services. The SS 304H flanges are widely applied in steam lines, thermal pipeline, refinery, heat exchanger, pressure vessel, boilers, and furnace systems where systemic dependability under thermal strain is necessary.
Specification of SS 304H Flanges
The specification of SS 304H Flanges is just a little bit different from SS30L flanges. So, below is the detailed information about it.
| Specification Category | Technical Details |
| Size & Pressure | NPS: 1/2? to 48? Class: 150# to 2500# Schedule: Sch 5 to XXS (Custom sizes available) |
| Standards | ASTM A182 / ASME SA182, ASME B16.5, ASME B16.47 (Series A & B), MSS SP44 |
| Common Types | Weld Neck, Slip On, Blind, Socket Weld, Reducing, Spectacle Blind, Orifice, Square, Screwed |
| Face Types | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G) |
| Manufacturing Process | Forging, Rolling, Casting, Cutting |
| Surface Finish | Serrated (Spiral/Concentric), Smooth, Mirror |
| Threading Options | NPT, FNPT, MNPT, BSPT, BSPP |
| Quality Testing | PMI (Positive Material Identification), Tensile, Hardness, Pressure/Hydro Test, NDT (X-ray) |
| Material Advantages | High-carbon for better heat resistance, Good Oxidation Resistance, Ductile/Easy to form |
| Origin / Facilities | Indian, Korean, Japanese, European |
Chemical Composition Of ASTM A182 Gr F304H Flanges
The chemical composition of SS 304H flanges is given below.
| Grade | C | Cr | Ni | Mn | Si | P | S |
| SS 304H | 0.10% max | 18 - 20% | 8 - 10.5% | 2.0% max | 0.75% max | 0.045% max | 0.03% max |
Mechanical Properties of SS 304H Flanges
The mechanical properties give the tensile strength and other properties of the material. So that's why here is the detailed information on SS 304H flanges.
| Grade | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| SS 304H | 8.0 g/cm- | 1400 -C (2550 -F) | 75,000 Psi / 515 MPa | 30,000 Psi / 205 MPa | 40% |
ASTM 304H Flange Size Chart
The table below gives the information about the size chart of ASTM A182 F304H Flanges.
| Standard | Class / Rating | Bolt Circle Dia | Flange Dia | Bolt Size | No. of Bolts | Bolt Hole Dia |
| AS 2129 | 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 | |
| PN25 | 65 | 95 | M12 | 4 | 14 | |
| PN40 | 65 | 95 | M12 | 4 | 14 | |
| PN20 | 60.5 | 90 | M14 | 4 | 16 | |
| AS 4087 | 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 |
Pressure Rating Chart of ASME SA182 F304H Weld Neck Flanges
The pressure rating chart give the detailed knowledge about the different pressures of SS 304H neck flanges.
| 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 |
Schedule Chart of INOX 304H Blind Flange
The detailed information of the INOX 304H Blind Flange Schedule Chart is given below.
| NPS | OD | Sch 10 | Sch 20 | 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 | 0.148 | 0.250 | 0.277 | 0.322 | 0.322 | 0.500 | 0.500 |
| 10? | 10.750 | 0.165 | 0.250 | 0.307 | 0.365 | 0.365 | 0.500 | 0.594 |
| 12? | 12.750 | 0.180 | 0.250 | 0.330 | 0.406 | 0.375 | 0.500 | 0.688 |
| 14? | 14.000 | 0.250 | 0.312 | 0.375 | 0.438 | 0.375 | 0.500 | 0.750 |
| 16? | 16.000 | 0.250 | 0.312 | 0.375 | 0.500 | 0.375 | 0.500 | 0.844 |
| 18? | 18.000 | 0.250 | 0.312 | 0.438 | 0.562 | 0.375 | 0.500 | 0.938 |
| 22? | 22.000 | 0.250 | - | - | - | 0.375 | 0.500 | - |
Equivalent Standard Of 304H SS BLRF Flanges
The SS 304H is made in different grades around the world. Some of the common grades of it are given below.
| Forging Grade | North America (UNS) | Europe (EN) | Germany (DIN) | Japan (JIS) | Russia (GOST) | France (AFNOR) | International (ISO) |
| ASTM A182 F304H | S30409 | X6CrNi18-11 | 1.4948 | SUS 304H | 08KH18N10 | Z6CN18-09 | X7CrNi18-9 |
Types of SS 304H Flanges
SS 304H flanges have numerous designs that are applicable in any industrial setting that requires high temperature strength, pressure resistance, and reliability over the long term.
Weld Neck Flanges (WNRF):
These flanges are reinforced by the neck and are welded directly to the pipe, which guarantees a high mechanical strength and is most suitable in the high-load and high-heat process lines.
Slip-On Flanges (SORF):
The slides work well on the pipe and can be welded into place, so they are an easy option when fast installation and cost-effectiveness are required by the piping system that should be used.
Blind Flanges (BLRF):
These flanges are used to seal pipe ends and openings of vessels, and they are best used in isolating a system, checking pressure, and closing it in the event of danger.
Socket Weld Flanges (SWRF):
They are designed to use compact piping layouts with high-pressure piping systems that are small-diameter joints that are powerful and leak-free.
Threaded Flanges:
They are installed without welding with internal threads and are used in low-risk, removable and serviceable piping designs.
Lap Joint Flanges:
These flanges, coupled with stub ends to provide flexibility, are ideal in cases where the system needs to be dismantled frequently with an adjustment in alignment and cleaning.
Applications and industrial uses of SS 304H Flanges
The SS flanges find a variety of applications in various industries through their strength, resistance to corrosion, and high service life- some of the major industries include:
- Petrochemical Industries: Applied in processing units that operate under high pressure and in those that require leak-free piping systems because they are under stress of high pressure and safety as well as long life.
- Power Generation Industries: Used in boilers, turbines, heat exchangers and steam lines whereby the materials have to endure high temperature, pressure and constant running.
- Food Processing Industries: Assures clean, contamination-free flow systems in production lines, storage tanks and pipelines, which meet cleanliness and safety requirements.
- Oil & Gas Industries: Applicable in pipelines, refineries, off-shore platform or processing plants because of their strength, resistance to corrosion and ability to withstand pressure.
- Sugar Industries: They are used in the extraction of juice lines, evaporation plants, and processing units where moisture, heat and corrosion resistance is necessary to operate smoothly.
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Price list of SS 304H Flanges:
The price range of SS 304H Flanges depends on many factors. But the table gives the estimated range of pricing for this material.
| Flange Type | Price Range (USD) | Price Basis | Status |
| Stainless Steel Forged Flanges | 2.05 - 10.06 | Per Piece | On Request |
| Stainless Steel Blind Flanges | 2.05 - 10.06 | Per Piece | On Request |
| Stainless Steel Slip-On Flange | 2.05 - 10.06 | Per Piece | On Request |
| Stainless Steel Socketweld Flanges | 2.05 - 10.06 | Per Piece | On Request |
| Stainless Steel Long Weld Neck Flanges | 2.05 - 10.06 | Per Piece | On Request |
Frequently Asked Questions (FAQ)
SS 304H flanges are stainless steel pipe connectors made from high-carbon 304H grade, designed for strength and high-temperature service.
Yes, they are specially made for high-temperature and high-pressure environments.
Yes, they offer good corrosion resistance in most industrial environments.
No, SS 304H is generally non-magnetic in the annealed condition.
Always choose the SS 304H Flanges based on pressure rating, temperature range, media type, and connection type required.
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