Stainless Steel 321 Flanges Supplier. ASTM A182 SS 321H Flanges Manufacturer in India.

Unichem Steel & Alloy Pvt. Ltd. is a well-known firm that manufactures and distributes a wide range of SS 321 / 321H Flanges, which has oxidation-resistant to 1600 ° F. Stainless Steel 321 Flanges is developed to provide an 18-8 type alloy with improved inter-granular-corrosion resistance. Stainless Steel 321H Flanges is not subject to weld decay (inter-granular corrosion) when exposed to mildly corrosive environments. Stainless Steel 321 Slip-On Raised Flanges is a titanium stabilized chromium-nickel austenitic stainless steel with good strength and excellent corrosion resistance, as supplied in the annealed condition. Stainless Steel 321 Blind Raised Flanges is an excellent choice for various applications ranging from oil refinery equipment to automotive exhaust systems. Stainless Steel 321 Weld Neck Flanges can be readily formed and drawn, however, higher pressures are required and more spring-back is encountered than for carbon steel and ferrite stainless steels. Stress Relief – Heat this Stainless Steel 321 Socket Weld Flanges up to 700 ° C for 1 to 2 hours and air cool. Stainless Steel 321 Threaded Flanges contains 18 % chromium, 8 % nickel, and a substantial addition of titanium. Stainless Steel 321 Spectacle Blind Flanges has comparable corrosion resistance and machinability to Stainless Steel 304. Stainless Steel 321 Lap Joint Flanges is not suitable for work at temperatures below 1700 ° F (927 ° C). Titanium is added to the composition of Stainless Steel 321H Ring joint Type Flanges to suppress grain boundary chromium carbide precipitation and reduce susceptibility to inter-granular corrosion.
Largest Manufacturer and Stockist of ASME SA182 Stainless Steel 321H Flanges, SS 321 Slip-on, Weld Neck, High Hub Blind, Raised Face, Socket Weld, Orifice, Ring Type Joint, Threaded, Lap Joint, Square, Long Weld Neck, Spectacle Blind, Paddle Blind, Ring Spacer, Tongue and Groove, Backing Ring, Nipoflange, Weldoflange, Forged, Male & Female, Reducing, Expander Flanges in Mumbai
- Stainless Steel 321/321H Flanges Specifications
- Stainless Steel 321/321H Flanges Equivalent Grades
- SS 321/321H Flanges Chemical Composition
- Stainless Steel 321/321H Flanges Mechanical Properties
- Stainless Steel 321 Flanges Dimensions
- Why Purchase From Unichem Steel & Alloy Pvt. Ltd.
- In Stock Grades of Stainless Steel 321 Flanges
- SS 321 Flanges Manufacturing Standards
- SS 321H Flanges Applications and Uses
- SS 321 Flanges Type, Pressure Class, & Size
- ASME SA182 SS 321H Flanges Ready Stock
- ASME SA182 SS 321 Flanges Exporter
- ASTM A182 321H Stainless Steel Flanges Supplier
- SS 321/321H Flanges Chemical Composition
- ASTM A182 F321 Stainless Steel Flanges Types
- SS 321 / 321H Lap Joint Flange
- SS 321 / 321H Square Flange
- SS 321 / 321H Slip On Flange
- SS 321 / 321H Weld Neck Flange
- SS 321 / 321H Blind Flange
- SS 321 / 321H Orifice Flange
- SS 321 / 321H Socket weld Flange
- SS 321 / 321H Threaded Flange
- SS 321 / 321H Long weld Neck Flange
- SS 321 / 321H RTJ Flange
- SS 321 / 321H Reducing Flange
- SS 321 / 321H Forged Flange
Most Trusted Supplier and Exporter of ASTM A182 Stainless Steel 321H Flange, UNS S32100 Pipe Flanges, WNR 1.4541 Flange, 150# SS 321 Flange, ASTM A182 SS F321H Flange in South Africa, Saudi Arabia, Spain, Kuwait, Singapore, Malaysia, UAE, Italy, Nigeria, Iraq, Thailand, Turkey, Vietnam, Oman, Qatar, Myanmar, Sri Lanka.
Stainless Steel 321/321H Flanges Specifications
Specifications
ASME SA182 / ASTM A182.
Standards / Dimensions
ANSI B16.47, MSS SP44, ANSI B16.5, Series A & B, ASA, API-605, AWWA, B16.48, BS 10, BS4504, EN-1092, DIN.
Size Range
1/2″(15 NB) to 48″(1200NB).

Flange Class
150#, 300#, 400#, 600#, 900#, 1500#, 2500#.
Flange Face Type
Flate Face (FF), Ring Type Joint (RTJ), Raised Face (RF).
Pressure
PN6, PN10, PN16, PN25, PN40, PN64 etc.
ASTM A182 F321 Stainless Steel Flanges Types
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Lap Joint Flange, ASTM A182 SS 321H Lap Joint Flange Supplier in Mumbai, India
Stainless Steel 321 Lap Joint Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Square Flange, ASTM A182 SS 321H Square Flange Supplier in Mumbai, India
Stainless Steel 321 Square Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Slip On Flange, ASTM A182 SS 321H Slip On Flange Supplier in Mumbai, India
Stainless Steel 321 Slip On Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Weld Neck Flange, ASTM A182 SS 321H Weld Neck Flange Supplier in Mumbai, India
Stainless Steel 321 Weld Neck Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Blind Flange, ASTM A182 SS 321H Blind Flange Supplier in Mumbai, India
Stainless Steel 321 Blind Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Orifice Flange, ASTM A182 SS 321H Orifice Flange Supplier in Mumbai, India
Stainless Steel 321 Orifice Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Socket weld Flange, ASTM A182 SS 321H Socket weld Flange Supplier in Mumbai, India
Stainless Steel 321 Socket weld Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Threaded Flange, ASTM A182 SS 321H Threaded Flange Supplier in Mumbai, India
Stainless Steel 321 Threaded Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Long weld Neck Flange, Swage Nipple, ASTM A182 SS 321H Long weld Neck Flange Supplier in Mumbai, India
Stainless Steel 321 Long weld Neck Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 RTJ Flange, ASTM A182 SS 321H RTJ Flange Supplier in Mumbai, India
Stainless Steel 321 RTJ Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Reducing Flange, ASTM A182 SS 321H Reducing Flange Supplier in Mumbai, India
Stainless Steel 321 Reducing Flange
ANSI B16.47 / ANSI B16.5 Stainless Steel 321 Forged Flange, ASTM A182 SS 321H Forged Flange Supplier in Mumbai, India
Stainless Steel 321 Forged Flange
Stainless Steel 321/321H Flange Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | JIS | EN |
---|---|---|---|---|
SS 321 | 1.4541 | S32100 | SUS 321 | X6CrNiTi18-10 |
SS 321H | 1.4878 | S32109 | SUS 321H | X12CrNiTi18-9 |
Stainless Steel 321/321H Flange Chemical Composition
Grade | C | Mn | Si | P | S | Cr | N | Ni | Ti |
---|---|---|---|---|---|---|---|---|---|
SS 321 | 0.08 max | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 5(C+N) – 0.70 max |
SS 321H | 0.04 – 0.10 | 2.0 max | 1.0 max | 0.045 max | 0.030 max | 17.00 – 19.00 | 0.10 max | 9.00 – 12.00 | 4(C+N) – 0.70 max |
Stainless Steel 321/321H Flange Mechanical Properties
Density | Melting Point | Tensile Strength | Yield Strength (0.2%Offset) | Elongation |
---|---|---|---|---|
8.0 g/cm3 | 1457 °C (2650 °F) | Psi – 75000 , MPa – 515 | Psi – 30000 , MPa – 205 | 35 % |
321 Stainless Steel Flanges Dimensions
Why Purchase From Unichem Steel & Alloy Pvt. Ltd.
- We at, Unichem Steel & Alloy Pvt. Ltd. design Stainless Steel 321H Industrial Flanges to the specific pressure ratings; 150lb, 300lb, 400lb, 600lb, 900lb, 1500lb, and 2500lb to satisfy all needs of varied industries in India and Overseas.
- We are producing SS 321 flanges using different dimensional standards such as American Standard Flanges (ANSI/ASME/AWWA), South African Standard Flanges (SABS / SANS), German Standard Flanges (DIN), Russian Standard Flanges (GOST), European Standard Flanges (EN), Petroleum Standard Flanges (API), Japanese Standard Flanges (JIS), MSS Standard Flanges (MSS-SP), British Standard Flanges (BS).
- For SS Grade 321 flanges making we have world-class machinery. In house CNC, Lathe Machines as well as punch dyes required for the production of ASTM A182 SS flanges. Testing facilities like PMI Machine, Spectro machine, Hardness Test, Mechanical test, Hydrostatic Testing, Pressure testing, Ultrasonic Testing, and manual inspection of gauge.
- We strive for quality production of ASME SA182 F321 Stainless Steel Slip-on Flanges. We adequately test raw materials and conform to DIN, EN, MSS, ANSI, ASTM, ASME, JIS Standards to make the highest quality ANSI/ASME B16.5 Stainless Steel 321H Weld Neck Flange. It is provided with 100% Radiography Test Report and Third Party Inspection or Buyer Inspection service is available on finished products.
- Unichem Steel & Alloy Pvt. Ltd. is an expert in manufacturing of custom size ANSI B16.5 / B16.47 Stainless Steel 321 Ring Type Joint Flanges with accurate dimensions and uniform wall thickness.
- As leading exporters and suppliers we keep a buffer stock of 321 Stainless Steel Blind Flange in the size range of 1/2″(15 NB) to 48″(1200NB). In order to meet the off-hand requirement of our buyers.
- SS 321 Flanges are packaged to ensure that there is no damage during transit. In the case of exports, products are packed in wooden cases to make sure that flanges can be reached to the client in the same form as it is manufactured. All Stainless Steel 321 Flanges are marked with Size, Grade, Lot No, and our trademark. On special requests we make custom marking on Flanges.
- In stock flanges to satisfy any urgent needs of customers using international standards: DIN EN 1092-1 covers Blind Flange EN Type 5 and DIN 2527, Threaded Flange EN Type 12 and DIN 2558/2565/2569, Weld Neck Flange EN Type 11 and DIN 2627–2638, Flat Flange EN Type 1 and DIN 2573/2578, Lapped Flange EN Type 2 / Type 4 and DIN 2641/2622/2655/2656.
- We provide Material Test Certificates (MTC) as per EN 10204 3.2 and EN 10204 3.1, Test Certificates certifying NACE MR0175, NACE MR0103.
- No minimum quantity order limit. Get Market leading prices on all types of Stainless Steel 321 Flanges in India.
In Stock Grades of Stainless Steel 321 Flanges
Stainless Steel 321 Flanges Manufacturing Standards
British Standard Pipe Flanges Standard | |
BS 10 Table D | Table D Pipe Flange, SS BS 10 Table D Flanges |
BS 10 Table E | Table E Pipe Flange, SS BS 10 Table E Flanges |
BS 10 Table F | Stainless Steel Table E Flanges, SS BS 10 Table E Flanges |
BS 10 Table H | Stainless Steel Table E Pipe Flanges, SS BS 10 Table E Flanges |
Italian Flanges Standard | |
UNI FLANGES | Welding neck (2280, 2281, 2282, 2283, 2284, 2285, 2286) Plan flanges (2276, 2277, 2278, 6083, 6084) Blind flanges (6091, 6092, 6093, 6094, 6095, 6096, 6097) Lapped flanges (6088, 6089, 6090, 2999, 2300) Threaded flanges (2253, 2254) | German Steel Flanges Standard |
DIN 2527 | Steel Blind Flanges, BLRF |
DIN 2573 / 2576 | Flat Flange for Welding (Slip On) |
DIN 2673 | Loose Flanges and Rings for Welding (Slip On Flanges and Plain Collars) |
DIN 2641 / 2642 | Lapped / Loose (Lap Joint) Flanges Plain Collars |
DIN 28115 | Long Neck Welding Flanges |
DIN PN10, PN16 | SS DIN PN 10 Flanges, SS PN10 Flanges, SS PN16 Flange |
DIN PN20, PN25 | SS PN20 Flanges, SS DIN PN 25 Flanges |
DIN PN40, PN50 | SS PN40 Flanges, SS DIN PN 50 Flanges |
American Steel Flanges Standard | |
Standard Code | Standard Name |
ANSI ASME SA-182 | Forged Flanges |
ANSI ASME B16.5 | Slip on flange, Threaded flange, Lap joint flange, Welding neck flange, Blind flange, RTJ flange |
ASME – B 16.47 | Welding neck flange, Blind flange |
ASME – B 16.36 | Welding neck flange Slip on flange |
Japanese Steel Flanges Standard | |
JIS B2220 | Slipon plate flange (SOP), Welding neck flange (WN), Lapjoint (LJ), Slipon Hub (SOH), Socket Welding flange (SW), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL) |
JIS B2291 | Slipon plate flange (SOP), Welding neck flange (WN), Lapjoint (LJ), Slipon Hub (SOH), Socket Welding flange (SW), Threaded flange (TR)/ Itegral flange (IT) Blank flange (BL) |
JIS 5K, 10K | SS 10K SOFF Flanges, SS 5K SORF Flanges |
JIS 16K, 20K | SS 20K BLRF Flanges, SS 16K Blind Flanges |
JIS 30K, 40K | SS 40K Blind Flanges, SS 30K Slip on Flanges |
Stainless Steel 321 Flanges Applications and Uses
- Power Plant / Power Generation
- Fertilizers
- Oil & Gas
- Refineries
- Chemical Industry
- Pulp and Paper Industry
- Petrochemicals
- Engineering Project
- Environmental and Water Projects
- Boiler Manufacturers
- Pumps and Valves
- Cement Industries
- Aerospace Industry
- Nuclear Industry
- Construction
- Ship Building Companies
- Thermal Processing
- Pharma Industry
- Off-Shore Oil Drilling Companies

321 Stainless Steel Flanges Type, Pressure Class, & Size
Specification | Item Type | Pressure Class | Size Range |
---|---|---|---|
ASME/ANSI B16.5 | Slip-on, Socket Weld, Blind, Weld Neck, Threaded and Lap Joint Flanges | 150 to 2500LBS 150 to 1500LBS |
26“ to 60″ 26“ to 48″ |
ASME/ANSI B16.36 | Orifice Flanges (Slip-on, Weld neck, Threaded) | 300 To 2500LBS | 1″ to 12″ |
ASME/ANSI B16.47 | Orifice Flanges (Slip-on, Weld neck, Threaded) | 75 to 300LBS 400, 600LBS 900LBS |
1/2“ to 12″ 26“ to 60″ 26“ to 48″ |
BS 10 | Blind, Slip-on and Welding neck flanges | TABLE-A, D, E, F, H, J, K, R, S, T | 15mm to 600mm |
ASME/ANSI B16.9/MSS SP-43 | Stub end -Type:A, B, C (Short pattern) | S10, S40, S80 | ½” to 24” |
EN 1092-1 / DIN / BS 4504 Flanges | 01 (Plate flange), 02 (Loose plate flange for Types 32—37), 04 (Loose plate flange for Type 34), 05 (Blind flange), 11 (Weld-neck flange), 12 (Hubbed slip-on flange), 13 (Hubbed | PN2.5 to PN16 PN25 PN40 PN63 PN100 PN160, PN250 PN320 PN400 |
10mm to 1800mm 10mm to 1000mm 10mm to 600mm 10mm to 400mm 10mm to 350mm 10mm to 300mm 10mm to 250mm 10mm to 200mm |
Ready Stock of Stainless Steel 321/321H Flanges in India
High Pressure SS 321 Slip-on Flange | Large Diameter SS 321H Weld Neck Flange |
Stainless Steel 321 Header Flanges | Stainless Steel 321 Screwed Flanges |
ANSI 150 SS 321H High Hub Blind Flange | Stainless Steel 321 Exhaust Flanges |
SS 321/321H Split Flanges | JIS SUS 321 Square Flanges |
AWWA Stainless Steel 321 Socket Weld Flange | WERKSTOFF NR. 1.4878 Orifice Flange |
Metric Stainless Steel 321 RTJ Flanges | UNS S32109 Class 150 Threaded Flange |
ASTM A182 SS 321H Long Weld Neck Flange | Pn16 Stainless Steel 321 Lap Joint Flange |
Super Austenitic SS 321 Figure 8 Flange | ASME SA182 SS 321H High Hub Flange |
ANSI B16.5 SS 321H Spectacle Blind Flange | Stainless Steel 321 BS10 Table D Flange |
Stainless Steel 321 Table E Flange | 321H SS Class 600 Expander Flange |
321 Stainless Steel Class 300 Flange | Stainless Steel 321 EN 1092-1 Flange |
150# Stainless Steel 321 Paddle Blind Flange | 1500# Stainless Steel 321 Ring Spacer Flange |
2500# SS 321 Tongue and Groove Flange | EN X6CrNiTi18-10 Raised Face Flange |
EN X12CrNiTi18-9 Flate Face Flange | PN10 Stainless Steel 321 Backup Flange |
PN16 Stainless Steel 321 Forged Flange | PN25 Stainless Steel 321 Reducing Flange |
ASTM A182 SS 321 Blank Flange | ASTM A182 Stainless Steel 321 Rotable Flange |
ASTM A182 SS 321H Conflat Flanges | ASTM A182 SS 321H Anchor Flanges |
Stainless Steel 321H Swivel Flange | Stainless Steel 321H Nipoflange |
Stainless Steel 321H Weldoflange | Stainless Steel 321H Male & Female Flange |
ASME SA182 Stainless Steel 321 Flanges Exporter
ASIA: Bangladesh, Cambodia, India, Indonesia, Japan, Malaysia, Maldives, Myanmar, Singapore, South Korea, Sri Lanka, Taiwan, Thailand, Vietnam.
AFRICA: Algeria, Angola, Egypt, Equatorial Guinea, Gabon, Libya, Nigeria, South Africa, Sudan, The Republic Of Congo.
MIDDLE EAST: Bahrain, Cyprus, Iran, Iraq, Jordan, Kuwait, Oman, Qatar, Saudi Arabia (KSA), Syria, Turkey, United Arab Emirates (UAE), Yemen.
NORTH AMERICA: Bahamas, Canada, Costa Rica, Denmark, Jamaica, Mexico, Panama, Puerto Rico, Trinidad And Tobago, USA.
SOUTH AMERICA: Argentina, Bolivia, Brazil, Chile, Colombia, Ecuador, Guyana, Paraguay, Uruguay, Venezuela.
ASME SA182 Stainless Steel 321 Flanges Supplier
Contact us to get a quick quote for ASTM A182 SS 321 Flanges.