Stainless Steel 321/321H Flanges Manufacturer
Midland Alloys Inc. is a reputable stainless steel flange manufacturer and supplier from India that offers precisely engineered products for high-performance industrial applications. Our titanium-stabilized austenitic stainless steel 321/321H flanges are made to withstand intergranular corrosion at temperatures ranging from 425°C to 850°C. Up to 700°C, these flanges retain their mechanical strength and resistance to oxidation. Our flanges are available in nominal bore sizes ranging from ½” to 48″ and pressure classes from 150 to 2500 and PN6 to PN64. They also meet international standards such as ANSI B16.5. SS UNS S32100 Orifice Flanges, SS 321 Blind Flanges and SS 321 SO Flanges are just a few of the industrial application for which we guarantee dependable performance and dimensional accuracy.
Benefits of Using Stainless Steel 321/321H Flanges
SS 321/321H Flanges provide lasting durability and resistance under demanding operating conditions. They are perfect for thermal cycling environments because of their chemical composition and titanium stabilization.
- Excellent resistance to intergranular corrosion in high-heat environments
- Strong oxidation resistance up to 850°C operating temperatures
- Superior weldability without requiring post-weld annealing
- High creep strength and stress rupture properties in 321H
- Dimensional stability under fluctuating thermal conditions
- Compatibility with multiple flange types and international standards
- Extended service life in chemical and petrochemical processing
- Low maintenance and enhanced reliability in piping systems
Stainless Steel 321/321H Flanges Specification
1/2" (15 NB) to 48" (1200NB)
ASTM A182 / A240 & ASME SA182 / SA240
ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Threaded / Screwed / Forged / Plate
150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Flate Face (FF), Raised Face (RF), Ring Type Joint (RTJ)
Forging, Rolling, Casting
FNPT, NPT, BSPT, MNPT, BSPP
Contact us today to discuss how Stainless Steel 321/321H Flanges can benefit your application. Whether you need guidance in selecting the right pipes or have specific requirements, our team of experts is here to help you find the optimal solution.
Technical Details & Delivery Condition
| STANDARD | WERKSTOFF NR. | UNS |
| SS 321 | 1.4541 | S32100 |
| SS 321H | 1.4878 | S32109 |
| Grade | Ni | C | Mn | P | S | Si | Cr | Mo | N | TI | |
| 321 | Max | 12.00 | 0.08 | 2.00 | 0.045 | 0.030 | 1.00 | 19.0 | 3 – 4 | 0.10 max | 0.70 |
| Min | 9.00 | – | – | – | – | – | 17.0 | – | – | 5(C+N) | |
| 321H | Max | 12.00 | 0.08 | 2.00 | 0.045 | 0.030 | 1.75 | 19.0 | 3 – 4 | 0.10 | 0.70 |
| Min | 9.00 | 0.04 | – | – | – | – | 17.0 | – | – | 4(C+N) | |
| Grade | Tensile Strength (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell B (HR B) max | Brinell (HB) max | ||||
| 321 | 515 | 205 | 40% | 95 | 217 |
| 321H | 515 | 205 | 40% | 95 | 217 |
Stainless Steel Flanges Grades We Offer
Difference Between ASTM A182 SS 321/321H Flanges and SS 316 Flanges
While Stainless Steel 316 Flanges are molybdenum-bearing and offer excellent corrosion resistance in marine and chloride-rich environments, ASTM A182 SS 321/321H Flanges stand out in high-temperature operations due to their titanium content. Grade 321 provides resistance to carbide precipitation, making it perfect for applications up to 800°C. Compared to 316 grade 321H offers better high-temperature strength due to its higher carbon content. In contrast to 316 321/321H flanges are favored in welded and thermal cycling situations where creep resistance and stress rupture are crucial.
Plate
Shear
Press
Inspection
Lathe
Drilling
Cleaning
Flange
Inspection
Analytic
Marking
Packing & Shipping
Applications of ASME SA‑182 SS 321/321H Flanges
SA-182 SS 321/321H ASME Because of their mechanical durability, corrosion resistance and thermal stability, flanges are widely used in many different industries. Particularly in reactors, heat exchangers, and pipelines that handle hot organic and inorganic chemicals they find vital uses in the petrochemical and chemical processing industries. These flanges are used by the pharmaceutical industry in sterile processing facilities that need to be sanitized at high temperatures. They are used in flue gas systems and boiler components in power plants. In order to ensure dependable, leak free connections under varying service conditions, waste treatment facilities and pulp and paper mills also incorporate these flanges in high pressure steam and chemical exposure zones.
Why Choose Midland Alloys Inc. for ASTM A182 Stainless Steel 321/321H Flanges
We are a prominent manufacturer and exporter of premium ASTM A182 Stainless Steel 321/321H Flanges from India, renowned for its precise engineering, dependable performance, and global compliance. We guarantee dimensional accuracy and mechanical consistency by manufacturing flanges in compliance with ASTM, ASME, DIN, EN and JIS standards. To meet a variety of project needs our ISO-certified facility offers complete customization options, including unique schedules, surface finishes, end types, and cut-to-length sizes. With a robust global presence we provide prompt delivery and expert export handling to clients in the Gulf, Europe, Africa and Southeast Asia. Every flange is subjected to stringent internal testing, such as PMI, hydro and ultrasonic tests, and is accompanied by Mill Test Certificates (MTCs) attesting to its mechanical and chemical compliance. When necessary we also assist with third-party inspections. We guarantee prompt execution, client-specific packaging and enduring value partnerships based on trust and quality thanks to our sophisticated infrastructure and team of seasoned professionals.
FAQs – Stainless Steel 321/321H Flanges
The price per kilogram of SS 321H flange varies depending on the size and quantity, but it usually starts at ₹450/kg.
SS 321 flanges generally range between ₹400–₹500 per kg, depending on type and finish.
SS 321 can handle up to 800°C, while SS 321H withstands higher temperatures due to elevated carbon content.
Yes, SS 321H flanges offer excellent performance in welded and high-stress environments.
Yes, we offer DIN/EN/JIS SS 321 flanges based on specific client or project standards.
Stainless Steel 321H Flanges Dimensions range from ½” NB to 48” NB under ANSI B16.5 and EN standards.
