Stainless Steel 347H Flanges Manufacturer in India
SS 347H stainless steel is a high-carbon, niobium-stabilized austenitic grade, which is specifically used to provide excellent performance in high temperature and corrosive conditions. The addition of niobium will inhibit the formation of carbide during welding and during extended heat exposure, and the additional carbon will increase the strength at high temperatures and creep resistance. SS 347H Flanges have found many applications in piping systems that require high thermal stability, mechanical strength, corrosion resistance and high service life. They can operate successfully at high pressure, high temperature and under chemically aggressive conditions giving them excellent structural integrity and leak-free connections in chemical processing, petrochemical plant, refineries, power generation plants, aerospace systems, exhaust systems, offshore platforms and other challenging industrial applications.
Table of Contents
- What Are SS 347H Flanges?
- Specification of SS 347H Flanges
- ASTM A182 F347 Chemical Composition
- Mechanical Properties of Stainless Steel 347H Flanges
- Equivalent Grades of Stainless Steel 347H Flanges
- Size Chart of 347H Stainless Steel Flanges
- Dimensions of Stainless Steel 347H Flanges
- Different Types of SS 347H Flanges
- Application and Uses of SS 347H Flanges
- Frequently Asked Questions (FAQ)
What Are SS 347H Flanges?
The SS 347H is produced on the basis of ASTM A182 F347H standards and is made of forged and rolled stainless steel to manufacture high-performance piping systems. This grade entails the stabilization of niobium, higher carbon content, which enhances resistance to intergranular corrosion, the elimination of carbide precipitation during welding and the provision of high strength and creep resistance during high temperatures. SS 347H flanges are particularly well-suited for systems that experience constant high pressures and temperatures, as well as in harsh environments of the industrial media, and hence are ideal in chemical plants, refineries, petrochemical units, heat exchangers, power generation systems, aerospace and exhaust components, offshore platforms, and other high-temperature critical applications.
Specification of SS 347H Flanges
| Specification | Details |
| Grade | Stainless Steel 347H / UNS S34709 |
| Material Standard | ASTM A182, ASME SA182 |
| Dimensional Standards | ANSI/ASME B16.5, B16.47 (Series A & B), B16.48, BS4504, BS10, DIN, EN-1092, MSS SP44 |
| Size Range | 1/2" to 48" (15NB - 1200NB) |
| Pressure Ratings | Class 150, 300, 718, 900, 1500, 2500; PN6 to PN64 |
| Flange Forms | SORF, Threaded, WNRF, Blind, Socket Weld, Lap Joint, RTJ, Spectacle Blind, Spacer Ring, Long Weld Neck, Nipo Flange, Nipolet, Plate, Flat, Orifice, Forged |
| Face Types | Flat Face (FF), Raised Face (RF), Ring Type Joint (RTJ) |
ASTM A182 F347 Chemical Composition
Every metal detailed composition is provided in the table below.
| Grade | C | Mn | Si | P | S | Cr | Cb/Nb | Ni | Fe |
| SS 347H | 0.04 - 0.10% | 2.0% max | 1.0% max | 0.045% max | 0.030% max | 17.00 - 19.00% | 8-C min - 1.10% max | 9.0 - 13.0% | 63.72% min |
Mechanical Properties of Stainless Steel 347H Flanges
The tensile and melting points and other factor or the mechanical properties are listed below.
| Property | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| Value | 8.0 g/cm- | 1454 -C (2650 -F) | 515 MPa (75,000 Psi) | 205 MPa (30,000 Psi) | 35 % |
Equivalent Grades of Stainless Steel 347H Flanges
The stainless steel 347H flanges come in various grades, and the information is given below.
| Standard | Werkstoff Nr. | UNS | JIS | GOST | EN |
| SS 347H | 1.4961 | S34709 | SUS 347H | - | X6CrNiNb18-12 |
Size Chart of 347H Stainless Steel Flanges
The different sizes of the 347H stainless steel flanges are given in the table below.
| Size | Dim | Class 125/150 | Class 300/400 | Class 600 | Class 900/1500 | Class 2500 |
|---|---|---|---|---|---|---|
| 1/2" | A | 3.50" (88.9) | 3.75" (95.2) | 3.75" (95.2) | 4.75" (121.0) | 5.25" (133.4) |
| b | 0.44" (11.1) | 0.56" (14.3) | 0.56" (14.3) | 0.88" (22.2) | 1.19" (30.2) | |
| D2 | 1.38" (34.9) | 1.38" (34.9) | 1.38" (34.9) | 1.38" (34.9) | 1.38" (34.9) | |
| D1 | 2.38" (60.3) | 2.63" (66.7) | 2.63" (66.7) | 3.25" (82.6) | 3.50" (88.9) | |
| n/d | 4 x 0.63" | 4 x 0.63" | 4 x 0.63" | 4 x 0.88" | 4 x 0.88" | |
| 3/4" | A | 3.88" (98.4) | 4.63" (117.5) | 4.63" (117.5) | 5.13" (130.0) | 5.50" (139.7) |
| b | 0.50" (12.7) | 0.63" (15.9) | 0.63" (15.9) | 1.00" (25.4) | 1.25" (31.8) | |
| D2 | 1.69" (42.9) | 1.69" (42.9) | 1.69" (42.9) | 1.69" (42.9) | 1.69" (42.9) | |
| D1 | 2.75" (69.8) | 3.25" (82.5) | 3.25" (82.5) | 3.50" (88.9) | 3.75" (95.2) | |
| n/d | 4 x 0.63" | 4 x 0.75" | 4 x 0.75" | 4 x 0.88" | 4 x 0.88" | |
| 1" | A | 4.25" (108.0) | 4.88" (123.8) | 4.88" (123.8) | 5.88" (149.2) | 6.25" (159.0) |
| b | 0.56" (14.3) | 0.69" (17.5) | 0.69" (17.5) | 1.13" (28.6) | 1.38" (34.9) | |
| D2 | 2.00" (50.8) | 2.00" (50.8) | 2.00" (50.8) | 2.00" (50.8) | 2.00" (50.8) | |
| D1 | 3.13" (79.4) | 3.50" (88.9) | 3.50" (88.9) | 4.00" (102.0) | 4.25" (108.0) | |
| n/d | 4 x 0.63" | 4 x 0.75" | 4 x 0.75" | 4 x 1.00" | 4 x 1.00" | |
| 1-1/4" | A | 4.63" (117.5) | 5.25" (133.4) | 5.25" (133.4) | 6.25" (159.0) | 7.25" (184.2) |
| b | 0.63" (15.9) | 0.75" (19.0) | 0.81" (20.6) | 1.13" (28.6) | 1.50" (38.1) | |
| D2 | 2.50" (63.5) | 2.50" (63.5) | 2.50" (63.5) | 2.50" (63.5) | 2.50" (63.5) | |
| D1 | 3.50" (88.9) | 3.88" (98.4) | 3.88" (98.4) | 4.38" (111.0) | 5.13" (130.0) | |
| n/d | 4 x 0.63" | 4 x 0.75" | 4 x 0.75" | 4 x 1.00" | 4 x 1.13" | |
| 1-1/2" | A | 5.00" (127.0) | 6.13" (155.6) | 6.13" (155.6) | 7.00" (177.8) | 8.00" (203.0) |
| b | 0.69" (17.5) | 0.81" (20.6) | 0.88" (22.2) | 1.25" (31.8) | 1.75" (44.5) | |
| D2 | 2.88" (73.0) | 2.88" (73.0) | 2.88" (73.0) | 2.88" (73.0) | 2.88" (73.0) | |
| D1 | 3.88" (98.6) | 4.50" (114.0) | 4.50" (114.0) | 4.88" (124.0) | 5.75" (146.0) | |
| n/d | 4 x 0.63" | 4 x 0.88" | 4 x 0.88" | 4 x 1.13" | 4 x 1.25" | |
| 2" | A | 6.00" (152.4) | 6.50" (165.1) | 6.50" (165.1) | 8.50" (215.9) | 9.25" (234.9) |
| b | 0.75" (19.0) | 0.88" (22.2) | 1.00" (25.4) | 1.50" (38.1) | 2.00" (50.8) | |
| D2 | 3.63" (92.1) | 3.63" (92.1) | 3.63" (92.1) | 3.63" (92.1) | 3.63" (92.1) | |
| D1 | 4.75" (120.7) | 5.00" (127.0) | 5.00" (127.0) | 6.50" (165.1) | 6.75" (171.0) | |
| n/d | 4 x 0.75" | 8 x 0.75" | 8 x 0.75" | 8 x 1.00" | 8 x 1.13" | |
| 2-1/2" | A | 7.00" (177.8) | 7.50" (190.5) | 7.50" (190.5) | 9.63" (244.0) | 10.50" (266.7) |
| b | 0.88" (22.2) | 1.00" (25.4) | 1.13" (28.6) | 1.63" (41.3) | 2.25" (57.2) | |
| D2 | 4.13" (104.8) | 4.13" (104.8) | 4.13" (104.8) | 4.13" (105.0) | 4.13" (105.0) | |
| D1 | 5.50" (139.7) | 5.88" (149.2) | 5.88" (149.2) | 7.50" (190.5) | 7.75" (197.0) | |
| n/d | 4 x 0.75" | 8 x 0.88" | 8 x 0.88" | 8 x 1.13" | 8 x 1.25" |
Dimensions of Stainless Steel 347H Flanges
The information on the dimension helps you to get the exact material for your requirements, and the information is given below.
| Size (Inch) | Size (mm) | O.D. (A) | Thk (B) | Hub O.D. (C) | Weld O.D. (D) | Length (E) | R.F. Dia (G) | R.F. Ht (H) | PCD (I) | Weld Face (J) |
|---|---|---|---|---|---|---|---|---|---|---|
| 1/2" | 15 | 90 | 9.6 | 30 | 21.3 | 46 | 34.9 | 2 | 60.3 | 1.6 |
| 3/4" | 20 | 100 | 11.2 | 38 | 26.7 | 51 | 42.9 | 2 | 69.9 | 1.6 |
| 1" | 25 | 110 | 12.7 | 49 | 33.4 | 54 | 50.8 | 2 | 79.4 | 1.6 |
| 1-1/4" | 32 | 115 | 14.3 | 59 | 42.2 | 56 | 63.5 | 2 | 88.9 | 1.6 |
| 1-1/2" | 40 | 125 | 15.9 | 65 | 48.3 | 60 | 73 | 2 | 98.4 | 1.6 |
| 2" | 50 | 150 | 17.5 | 78 | 60.3 | 62 | 92.1 | 2 | 120.7 | 1.6 |
| 2-1/2" | 65 | 180 | 20.7 | 90 | 73 | 68 | 104.8 | 2 | 139.7 | 1.6 |
| 3" | 80 | 190 | 22.3 | 108 | 88.9 | 68 | 127 | 2 | 152.4 | 1.6 |
| 3-1/2" | 90 | 215 | 22.3 | 122 | 101.6 | 70 | 139.7 | 2 | 177.8 | 1.6 |
| 4" | 100 | 230 | 22.3 | 135 | 114.3 | 75 | 157.2 | 2 | 190.5 | 1.6 |
| 5" | 125 | 255 | 22.3 | 164 | 141.3 | 87 | 185.7 | 2 | 215.9 | 1.6 |
| 6" | 150 | 280 | 23.9 | 192 | 168.3 | 87 | 215.9 | 2 | 241.3 | 1.6 |
| 8" | 200 | 345 | 27 | 246 | 219.1 | 100 | 269.9 | 2 | 298.5 | 1.6 |
| 10" | 250 | 405 | 28.6 | 305 | 273 | 100 | 323.8 | 2 | 362 | 1.6 |
| 12" | 300 | 485 | 30.2 | 365 | 323.8 | 113 | 381 | 2 | 431.8 | 1.6 |
| 14" | 350 | 535 | 33.4 | 400 | 355.6 | 125 | 412.8 | 2 | 476.3 | 1.6 |
| 16" | 400 | 595 | 35 | 457 | 406.4 | 125 | 469.9 | 2 | 539.8 | 1.6 |
| 18" | 450 | 635 | 38.1 | 505 | 457.2 | 138 | 533.4 | 2 | 577.9 | 1.6 |
| 20" | 500 | 700 | 41.3 | 559 | 508 | 143 | 584.2 | 2 | 635 | 1.6 |
| 24" | 600 | 815 | 46.1 | 663 | 610 | 151 | 692.2 | 2 | 749.3 | 1.6 |
Different Types of SS 347H Flanges
Stainless Steel 347 Weld Neck Raised Face (WNRF) Flange
Stainless Steel 347 Weldolet Flange
.webp)
Stainless Steel 347 Socket Weld Raised Face (SWRF) Flange
Stainless Steel 347 Spectacle Blind Flange
Stainless Steel 347 Spacer Ring Flange
Stainless Steel 347 Slip On Raised Face (SORF) Flange
Stainless Steel 347 Reducing Flange
Stainless Steel 347 Nipolet Flange
Stainless Steel 347 Lap Joint Flange
Stainless Steel 347 Flat Face Flange
.webp)
Stainless Steel 347 Blind Raised Face (BLRF) Flange
Stainless Steel 347 Blind Flange
Application and Uses of SS 347H Flanges
The SS 347H flanges are optimized to withstand harsh conditions and are offered to provide greater strength in high temperature, corrosive environments, as well as long-term reliability in the severity of operation in various important industrial operations, which are given below.
Chemical Tanks
Applied in storage and processing tanks, which deal with corrosive chemicals, acids and solvents, there is a need to deal with high corrosion resistance and material stability.
Pulp & Paper Industries
Used in digesters, bleaching units, piping systems and processing lines where resistance to heat, moisture and corrosive chemicals is needed.
Petrochemical Industries
Applied in high pressure and high temperature piping systems, reactor, and transfer lines where there are aggressive chemicals and hydrocarbons.
Power Generation Industries
Fitted in boilers, heat exchangers, steam pipelines and turbine systems which require thermal stability and durability.
Oil & Gas Industries
Applied in upstream, midstream, and downstream oil piping systems, refineries and processing units in the treatment of high pressure, heat and corrosive media.
Desalination
Used in seawater intake systems, high-salinity pipelines and processing units where resistance to corrosion is needed in high-chloride environments.
Architecture and Construction
Applied in structural uses, exposed piping and industrial use where it is necessary to have durability, strength and corrosion resistance.
Food Processing Equipment
Attached to hygienic piping systems, processing units, and storage facilities, which demand corrosion resistance, cleanliness, and the safety of the material.
Biofuels Plant
Applied in processing lines, storage facilities, and transfer pipelines of aggressive bio-chemicals and of high-temperature fluids.
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Frequently Asked Questions (FAQ)
SS 347H flange is a high-temperature stainless steel flange made for tough conditions where heat, pressure, and long service life really matter.
SS 347H has more carbon, which gives it extra strength and better performance in continuous high-temperature environments compared to SS 347.
SS 347H uses niobium for stabilization, which helps prevent carbide buildup and makes it much more resistant to intergranular corrosion than SS 304 or SS 316.
The very reliable suppliers include certified stainless steel manufacturers in India and worldwide, with trusted names like Metinox Overseas known for quality and consistency.
Yes, they can be made in custom sizes, pressure ratings, and specifications to match specific project needs.
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