Stainless Steel 321H Flanges Manufacturer in India
SS 321H stainless steel is a high-carbon and titanium-stabilized austenitic grade that was created specifically to be better and stronger when used in high-temperature and corrosive conditions. Titanium inhibits the formation of carbide during the welding and storage of long-term exposure to heat, whereas the increased carbon content enhances heat-resistance at high temperatures and creep. The SS 321H Flanges are common in piping systems that require outstanding thermal stability, mechanical strength, corrosion resistance, and longevity of service. These flanges can be used in high-pressure, high-temperature, and chemically aggressive environments. They are well endowed with strong structural integrity and consistent and leak-free connections in industries including chemical processing, petrochemical plants, refineries, power generation facilities, aerospace systems, exhaust systems, offshore systems and various other demanding industrial settings.
Table of Contents
- What Are SS 321H Flanges?
- Specification of the Stainless Steel 321H Flanges
- Chemical Properties of the SS 321H Flanges
- Mechanical Properties of ASME SA403 WP321 Flange
- Equivalent grades of SS 321H Flanges
- Different Types of SS 321H Flanges
- Application and Industrial Uses of SS 321H Flanges
- Frequently Asked Questions (FAQ)
What Are SS 321H Flanges?
SS 321H flanges are manufactured based on the specifications of ASTM A182 F321H and are made out of forged and rolled stainless steel to produce high-performance piping systems. Titanium stabilization is combined with a high level of carbon in this grade, which helps to reduce intergranular corrosion, avoids the formation of carbide during welding, and increases strength and creep resistance at higher temperatures. SS 321H is a special flange that is useful in systems that are subjected to incessant high heat, pressure, and unforgiving industrial media. They are widely applied in chemical plants, refineries, petrochemical units, heat exchangers, power stations, aerospace and exhaust systems, offshore platforms and other applications where thermal stability, corrosion resistance and long term life are crucial.
Specification of the Stainless Steel 321H Flanges
| Category | Specifications & Details |
| Standards | ANSI/ASME B16.5, B16.36, B16.47A/B, B16.48, MSS S44, ISO70051, EN1092, DIN, BS4504, BS 10, JIS B2220, GOST, API7S-15, API7S-43, API605 |
| ANSI Pressure Ratings | Class 150, Class 300, Class 600, Class 900, Class 1500, Class 2500 |
| DIN/UNI/EN Pressure | PN6, PN10, PN16, PN25, PN40, PN64 / 6Bar, 10Bar, 16Bar, 25Bar, 40Bar |
| JIS Pressure Ratings | 5K, 10K, 16K, 20K, 30K, 40K, 63K |
| Common Types | Forged, Plate, Threaded, Screwed |
| Shapes & Faces | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Lap-Joint Face (LJF), Large/Small Male-Female (LMF/SMF), Tongue & Groove |
| Production Technique | Forged, heat-treated, and Machined |
| Testing Methods | Hydrostatic testing, X-ray detector, Direct-reading Spectrograph, Ultrasonic flaw detector, Magnetic particle detector |
| Manufacturing Equipment | Press machine, Pushing Machine, Bending machine, Electric bevelling machine, Sand-blasting machine |
Chemical Properties of the SS 321H Flanges
The detailed chemical composition of every metal in SS 321H flanges is given below.
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | Ti |
| SS 321H | 0.04 - 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 - 19.00 | - | 9.00 - 12.00 | 4(C+N) - 0.70 max |
Mechanical Properties of ASME SA403 WP321 Flange
The tensile strength of SS 321H flanges is given below. For more information, contact us.
| Property | Density | Melting Point | Tensile Strength | Yield Strength (0.2% Offset) | Elongation |
| Value | 8.0 g/cm- | 1457 -C (2650 -F) | 515 MPa (75,000 Psi) | 205 MPa (30,000 Psi) | 35 % |
Equivalent grades of SS 321H Flanges
The SS 321 Flanges are made in different grades according to the countries. So the most common grades of this material are given below.
| Standard | Werkstoff Nr. | UNS | JIS | EN |
| SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Different Types of SS 321H Flanges
Stainless Steel 1.4541 PN16 blind flange
SS A182 F321H EN 1092-1 Flanges
321H Stainless Steel Class 150 LBS Flange
321 SS Slip On Integral flange
Application and Industrial Uses of SS 321H Flanges
Industries with high operating temperatures, corrosion, and long-lasting operation demand SS 321H flanges, which are common in industries that are highly demanding.
Petrochemical Industry
Applied in high temperature processing plants, cracking plants and refinery pipelines where high levels of heat resistance and strength are required.
Chemical Industry
Used in reactors, heat exchangers, and chemical transfer lines exposed to corrosive chemicals and high temperatures.
Oil & Gas Industry
Fixed in pipelines under high pressure and temperature, including processing units and offshore plants.
Pulp & Paper Industry
Used in piping systems that transfer steam, chemicals, and high-temperature fluids in processing plants.
Power Plant Industry
Applied in boilers, steam lines, turbines, and other high heat and pressure systems in thermal power plants.
Food Processing Industry
Used where high strength, hygiene, and corrosion resistance are required in high temperature processing lines.
Pharmaceuticals Industry
Fitted in clean piping systems, high temperature processing units, and sterile manufacturing environments.
Energy Industry
Used in thermal energy plants, industrial heating systems, and energy production facilities.
Aerospace Industry
Used in exhaust systems, high temperature components, and heat-resistant structural applications.
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Frequently Asked Questions (FAQ)
SS 321H flanges have higher carbon content, giving them better strength and performance at high temperatures compared to SS 321 flanges.
The higher carbon content improves heat strength and creep resistance, while titanium stabilization prevents carbide formation.
The most common types include weld neck, slip-on, blind, socket weld, and threaded flanges.
They are widely used in power plants, refineries, petrochemical units, boilers, heat exchangers, and high-temperature industrial systems.
They perform well, offering good resistance to corrosion, oxidation, and chemical attack in harsh industrial conditions.
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