Stainless Steel 304H Flanges Manufacturer & Supplier
Stainless Steel 304H Flanges are a high-carbon variant of the standard SS 304 grade, where the ‘H’ designation indicates an elevated carbon content (0.04–0.10%), which enhances creep strength and resistance to intergranular corrosion at elevated temperatures. Similar to other austenitic stainless steel flanges, they contain 18–20% chromium and 8.0 -10.5% nickel that give them good oxidation resistance and durability. The SS 304H flanges have good mechanical characteristics as well in terms of high tensile strength and good weldability in controlled environments. They are made to ASTM A182 F304H, and are offered in ANSI B16.5, sizes 1/2 to 48 inches, and comes in stainless steel 304h forged fitting, weld neck, slip-on, and blind flanges and many more. These types of flanges are commonly utilized in power plants, heat exchangers, and refineries and Amardeep Steel is a reliable manufacturer and supplier
Stainless Steel 304H Flanges Specification
|
Attribute |
Details |
|---|---|
|
Specification |
ASTM A182 / A240, ASME SA182 / SA240 |
|
Grade |
Stainless Steel 304H |
|
Dimensions |
ANSI/ASME B16.5, B16.47 Series A & B, EN-1092, BS4504, BS 10, B16.48, DIN, etc. |
|
Specialization |
ASME, ANSI, DIN, BS, EN, SORF, BLRF, SWRF, WNRF Flanges, etc. |
|
Flange Types |
Blind, Slip-on, Reducing, Socket Weld, Weld Neck, Orifice, Lap Joint, Threaded, Plate, and Industrial Flanges |
|
Pressure Class |
150#, 300#, 600#, 900#, 1500# & 2500# |
Chemical Composition of Stainless Steel 304H Flanges
| Grades | C | Mn | Si | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| 304H | 0.04 - 0.10 | 2.0 max | 0.75 max | 0.045 max | 0.03 max | 18.0 - 20.0 | 8.0 - 10.5 | 0.10 max |
Mechanical Properties of SS 304H Flanges
| Grade | Tensile Strength ksi (min) | Yield Strength 0.2% ksi (min) | Elongation % | Hardness (Brinell) MAX | Hardness (Rockwell B) MAX |
|---|---|---|---|---|---|
| 304H | 75 | 30 | 40 | 201 | 92 |
Equivalent Grades of SS 304H Flanges
|
Standard |
Werkstoff Nr. |
UNS |
|---|---|---|
|
SS 304H |
1.4948 |
S30409 |
Types of Stainless steel 304H Flanges
Lap Joint Flange
Paddle Blind Flange
Ring Spacer Flange
Backing Ring Flange
Nipoflange
Weldoflange
Raised Face Flange
Series A Flange
Series B Flange
Male & Female Flange
ASTM A182 SS 304H Flanges Weight Chart
| Pipe Size | 150# (WN/SO/BLD) | 300# (WN/SO/BLD) | 600# (WN/SO/BLD) | 900# (WN/SO/BLD) | 1500# (WN/SO/BLD) | 2500# (WN/SO/BLD) |
|---|---|---|---|---|---|---|
| 1/2″ | 2 / 1 / 1 | 2 / 1 / 1 | 2 / 2 / 2 | Use 1500# | 5 / 4 / 4 | 7 / 7 / 7 |
| 3/4″ | 2 / 2 / 2 | 3 / 3 / 3 | 4 / 3 / 3 | Use 1500# | 6 / 5 / 6 | 8 / 8 / 8 |
| 1″ | 3 / 2 / 2 | 4 / 3 / 3 | 4 / 4 / 4 | Use 1500# | 9 / 8 / 8 | 12 / 11 / 11 |
| 1-1/2″ | 4 / 3 / 3 | 7 / 6 / 6 | 8 / 7 / 8 | Use 1500# | 13 / 12 / 13 | 25 / 22 / 23 |
| 2″ | 6 / 5 / 5 | 9 / 7 / 8 | 12 / 9 / 10 | Use 1500# | 25 / 25 / 25 | 42 / 37 / 39 |
| 2-1/2″ | 8 / 7 / 7 | 12 / 10 / 12 | 18 / 13 / 15 | Use 1500# | 36 / 36 / 35 | 52 / 55 / 56 |
| 3″ | 10 / 8 / 9 | 15 / 13 / 16 | 23 / 16 / 20 | 31 / 26 / 29 | 48 / 48 / 48 | 94 / 83 / 86 |
| 4″ | 15 / 13 / 17 | 25 / 22 / 27 | 42 / 37 / 41 | 53 / 53 / 54 | 73 / 73 / 73 | 145 / 125 / 130 |
| 5″ | 19 / 15 / 20 | 32 / 28 / 35 | 68 / 63 / 68 | 86 / 83 / 87 | 130 / 130 / 140 | 245 / 210 / 225 |
| 6″ | 24 / 19 / 26 | 42 / 39 / 50 | 81 / 80 / 86 | 110 / 110 / 115 | 165 / 165 / 160 | 380 / 325 / 345 |
| 8″ | 39 / 30 / 45 | 67 / 58 / 81 | 120 / 115 / 140 | 175 / 170 / 200 | 275 / 260 / 300 | 580 / 485 / 530 |
| 10″ | 52 / 43 / 70 | 91 / 81 / 124 | 190 / 170 / 230 | 260 / 245 / 290 | 455 / 435 / 510 | 1075 / 930 / 1025 |
| 12″ | 80 / 64 / 110 | 140 / 115 / 185 | 225 / 200 / 295 | 325 / 325 / 415 | 690 / 580 / 690 | 1525 / 1100 / 1300 |
| 14″ | 110 / 90 / 140 | 180 / 165 / 250 | 280 / 230 / 355 | 400 / 400 / 520 | 940 / NA / 975 | NA |
| 16″ | 140 / 98 / 180 | 250 / 190 / 295 | 390 / 330 / 495 | 495 / 425 / 600 | 1250 / NA / 1300 | NA |
| 18″ | 150 / 130 / 220 | 320 / 250 / 395 | 475 / 400 / 630 | 680 / 600 / 850 | 1625 / NA / 1750 | NA |
| 20″ | 180 / 165 / 285 | 400 / 315 / 505 | 590 / 510 / 810 | 830 / 730 / 1075 | 2050 / NA / 2225 | NA |
| 24″ | 260 / 220 / 430 | 580 / 475 / 790 | 830 / 730 / 1250 | 1500 / 1400 / 2025 | 3325 / NA / 3625 | NA |
304H Stainless Steel Flanges Dimension Tolerance Chart
| Feature | Description / Range | Tolerance (Inches) | Tolerance (mm) |
|---|---|---|---|
| O | Outside Diameter ≤ 24″ | ±0.06″ | ±1.6 mm |
| Outside Diameter > 24″ | ±0.12″ | ±3.2 mm | |
| R | Contact Face – 0.06″ (1.6 mm) raised face | ±0.03″ | ±0.8 mm |
| Contact Face – 0.25″ (6.4 mm) raised face | ±0.02″ | ±0.5 mm | |
| A | Hub Diameter at Welding – NPS 5 and smaller | +0.09″, −0.03″ | +2.4 mm, −0.8 mm |
| Hub Diameter at Welding – NPS 6 and larger | +0.16″, −0.03″ | +4.0 mm, −0.8 mm | |
| B | Inside Diameter – NPS 10 and smaller | ±0.03″ | ±0.8 mm |
| Inside Diameter – NPS 12 to 18 | ±0.06″ | ±1.6 mm | |
| Inside Diameter – NPS 20 and larger | +0.12″, −0.06″ | +3.2 mm, −1.6 mm | |
| X | Hub Diameter at Base ≤ 24″ | ±0.06″ | ±1.6 mm |
| Hub Diameter at Base > 24″ | ±0.12″ | ±3.2 mm | |
| C | Thickness – NPS 18 and smaller | +0.12″, −0.00″ | +3.2 mm, −0.0 mm |
| Thickness – NPS 20 and larger | +0.19″, −0.00″ | +4.8 mm, −0.0 mm | |
| — | Drilling (Bolt Circle & Hole Spacing) | ±0.06″ / ±0.03″ | ±1.6 mm / ±0.8 mm |
| — | Eccentricity – NPS 2-1/2 and smaller | ±0.03″ | ±0.8 mm |
| Eccentricity – NPS 3 and larger | ±0.06″ | ±1.6 mm | |
| — | Length Through Hub – NPS 10 and smaller | ±0.06″ | ±1.6 mm |
| Length Through Hub – NPS 12 and larger | ±0.12″ | ±3.2 mm |
Application Industries of Stainless Steel 304H Flanges
- Petrochemical Industry
- Chemical Industry
- Oil and Gas Industry
- Pulp & Paper Industry
- Power Plant Industry
- Food Processing Industry
- Pharmaceuticals Industry
- Energy Industry
- Aerospace Industry
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Frequently Asked Questions - Stainless Steel 304H Flanges
What are Stainless Steel 304H flanges?
Stainless Steel 304H flanges are high-carbon forged pipe fittings used to connect pipes and equipment in high-temperature systems. They are designed for improved strength and performance in elevated temperature applications.
What does “H” mean in SS 304H flanges?
The “H” in 304H stands for higher carbon content, which increases creep strength and heat resistance. This makes the material suitable for high-temperature environments.
What is ASTM A182 F304H flange?
ASTM A182 F304H is a standard specification for forged high-carbon flanges used in high-temperature and pressure services. It ensures proper chemical composition and mechanical properties.
What is the difference between 304H and 304L flanges?
The main difference is carbon content, 304H has higher carbon for strength at high temperatures, while 304L stainless steel grade has lower carbon for better weldability and corrosion resistance.
What are the properties of Stainless Steel 304H flanges?
SS 304H flanges offer high tensile strength, excellent oxidation resistance, good creep strength, and reliable performance in elevated temperatures, making them ideal for heat-intensive applications.
