Tesco Steel & Engineering manufactures 301 stainless steel flanges — flanges in grade SS 301 (UNS S30100), a high-strength, work-hardenable austenitic chromium-nickel stainless steel. Its high work-hardening rate lets it be cold-worked to very high tensile and spring-temper strength while keeping good ductility, formability and corrosion resistance. Available in weld neck, slip-on, blind, socket-weld, lap-joint, threaded and plate types to ASME B16.5 / B16.47. Equivalent grades: EN 1.4310, JIS SUS301, X10CrNi18-8, 301S21, AMS 5519, AMS 5518. Class 150 to 2500, PN6 to PN400. ISO 9001:2015 certified. Made in India.
SS 301 (UNS S30100) Stainless Steel Flange
Tesco Steel & Engineering manufactures SS 301 flanges in the full range of types and faces to global standards. Explore our wider stainless steel flange range, weld neck flanges, slip-on flanges, blind flanges, and the flange dimension charts.
| Standard / System | Designation |
|---|---|
| UNS | S30100 |
| EN (Europe) | 1.4310 / X10CrNi18-8 |
| JIS (Japan) | SUS 301 |
| BS (UK) | 301S21 |
| AMS (Aerospace) | AMS 5518, AMS 5519 |
| Typical Composition | Cr 16–18%, Ni 6–8%, C ≤ 0.15%, Mn ≤ 2%, Si ≤ 1%, balance Fe |
| SS 301 flanges are available in the following specifications: | |
|---|---|
| Material Grade | SS 301 / UNS S30100 / EN 1.4310 / SUS301 / X10CrNi18-8 / 301S21 / AMS 5518 / AMS 5519 |
| Size | 1/2″ NB to 56″ NB (DN 15 to DN 1400) |
| Class / Rating | 150#, 300#, 600#, 900#, 1500#, 2500# · 3000#, 6000#, 9000# (socket-weld / threaded) |
| Pressure Ratings | PN 1 – PN 400 (PN6, 10, 16, 25, 40, 64, 100, 160, 250, 320, 400) |
| Schedule / Wall Thickness | SCH 20, 40, STD, 80, XS, 160, XXS |
| Standards | ASME B16.5, ASME B16.47 (Series A & B), MSS SP-44, DIN EN 1092-1, BS 4504, JIS B 2220 |
| Flange Types | Weld Neck (WNRF), Slip-On (SORF), Blind, Socket Weld (SWRF), Lap Joint, Threaded / Screwed, Plate, Reducing, Long Weld Neck |
| Face Finish | Raised Face (RF), Flat Face (FF), Ring Type Joint (RTJ), Tongue & Groove (T&G), Male & Female (M&F) |
SS 301 flange dimensions follow the same ASME B16.5 / B16.47 dimensional standards as other stainless grades. Use the link below for the complete dimension charts — outside diameter, bolt-circle diameter, number and size of bolt holes, hub and bore dimensions for every NPS and class:
| Reference | Dimension Chart |
|---|---|
| 301 Stainless Steel Flange Dimensions (ASME B16.5 / B16.47) | View Flange Dimensions → |
| Flange Weight Chart | View Flange Weights → |
| RTJ Gasket Size Chart | View RTJ Size Chart → |
SS 301 flanges come in several types, each with its own features. Understanding them is the first step in choosing the right flange for your project — the most common are Weld Neck, Slip-On, Blind, Socket Weld, Lap Joint and Threaded.
SS 301 Weld Neck Flange
SS 301 Slip-On Flange
SS 301 Blind Flange
| Flange Type | Description & Typical Use |
|---|---|
| Weld Neck | Tapered hub butt-welded to the pipe for a long-lasting, leak-free joint — high-pressure piping with a smooth pipe-to-flange transition. |
| Slip-On | Slipped over the pipe and fillet-welded inside and out — easy to align and fit; ideal for low-to-moderate pressure systems. |
| Blind | Solid disc that closes the end of a pipe or vessel — used where periodic inspection or future expansion is needed. |
| Socket Weld | Pipe is inserted into a socket bore and fillet-welded — for small-bore, high-pressure lines. |
| Lap Joint | Used with a stub end so the flange can rotate freely — ideal for systems needing frequent dismantling. |
| Threaded | Internal NPT/BSP threads screw onto the pipe — for low-pressure, non-welded connections. |
Grade 301's leaner Cr-Ni content gives a high work-hardening rate — achieving full-hard and spring-temper strength for demanding structural service.
Resists atmospheric corrosion and many organic and inorganic chemicals, with good oxidation resistance in mild-to-moderate environments.
100% dimensional inspection to ASME B16.5 / B16.47 — OD, bolt circle, bore, hub and face finish all verified.
Weld neck, slip-on, blind, socket-weld, lap-joint, threaded and plate — in RF, FF, RTJ, T&G and M&F faces.
EN 10204 3.1 mill test certificates, heat/lot traceability, PMI and third-party inspection on request.
Made to ASME B16.5 / B16.47, DIN EN 1092-1, BS 4504 and JIS B 2220 — accepted by project specs worldwide.
| Industry | Typical Use |
|---|---|
| Petrochemical | Process piping & structural flanged connections |
| Chemical Processing | Mild-to-moderate corrosive media handling |
| Oil & Gas | Surface piping & equipment connections |
| Power Generation | Utility & balance-of-plant piping |
| Shipbuilding | High-strength structural & deck piping |
| Fertilizer & Sugar | Process lines & equipment flanges |
| Cement | Plant piping & ducting connections |
| Engineering Projects | General high-strength flanged joints |
SS 301 flange prices depend on grade, NPS, pressure class, flange type, quantity and current nickel/stainless market rates. Tesco Steel & Engineering offers competitive factory-direct pricing backed by ISO-certified quality. We maintain ready stock of standard items and export at the best price. Click Ask for Quote or message us on WhatsApp at +91 92233 66922 for an updated price list with stock availability against your requirement.
Q1. What is a 301 stainless steel flange?
A 301 stainless steel flange is a pipe flange made from grade SS 301 (UNS S30100) — a high-strength, work-hardenable austenitic chromium-nickel stainless steel. Its lower chromium and nickel content gives a high work-hardening rate, so it can be cold-worked to very high tensile and spring-temper strength while keeping good ductility and corrosion resistance.
Q2. What are the equivalent grades of SS 301?
SS 301 equivalents include UNS S30100, EN 1.4310, JIS SUS301, X10CrNi18-8, 301S21 (BS), AMS 5519 and AMS 5518.
Q3. How does 301 stainless steel differ from 304?
Grade 301 has lower chromium (16–18%) and nickel (6–8%) than 304, which raises its work-hardening rate and achievable strength — ideal for spring-temper, structural and high-strength formed parts. Grade 304 has higher Cr/Ni for greater general corrosion resistance and is preferred where strength is not the priority.
Q4. What pressure classes and sizes are available for SS 301 flanges?
SS 301 flanges are available from NPS 1/2 to 56 inch in ASME classes 150, 300, 600, 900, 1500 and 2500 (and 3000#/6000#/9000# socket-weld/threaded), with DIN/EN ratings from PN6 to PN400.
Q5. Which flange types does Tesco supply in 301 stainless steel?
Weld neck (WNRF), slip-on (SORF), blind, socket weld, lap joint (with stub end), threaded/screwed and plate flanges — in raised face, flat face and ring-type-joint faces to ASME B16.5 / B16.47, DIN EN 1092-1 and BS 4504.
Q6. What industries use 301 stainless steel flanges?
Petrochemical, chemical, oil & gas, power generation, shipbuilding, fertilizer, sugar, cement and general engineering projects — especially where high strength combined with corrosion resistance is required.
Q7. Are SS 301 flanges supplied with material test certificates?
Yes. Every 301 stainless steel flange is supplied with EN 10204 3.1 (or 3.2) mill test certificates with full heat/lot traceability, dimensional inspection to ASME B16.5, and PMI and third-party inspection on request.
Q8. Can Tesco Steel export 301 stainless steel flanges internationally?
Yes. Tesco Steel & Engineering is an ISO-certified manufacturer and exporter of SS 301 flanges from Mumbai, India, supplying to the USA, Germany, UK, Saudi Arabia, UAE, Oman, and 90+ other countries.
Countries We Export 301 Stainless Steel Flanges To: Kuwait, UAE, Germany, Saudi Arabia, West Africa, Iraq, Congo, Mexico, Bahrain, Canada, Philippines, Thailand, Kenya, Oman, Malaysia, Turkey, Qatar, Sudan, Netherlands, Nigeria, Lithuania, Gabon, Russia, Vietnam, Angola, Bolivia, Indonesia, UK, Yemen, Italy, United States, Venezuela, Spain, Iran, Estonia, Kazakhstan, Algeria, Jordan, Ecuador, Portugal, Colombia, Libya, Chile, Peru, South Africa, Namibia, Afghanistan, Israel, Zambia, Macau, Morocco, Denmark, Taiwan, Norway, Belarus, North Macedonia, Lebanon, Sri Lanka, Bhutan, Bulgaria, Albania, Ukraine, Belgium, Finland, Slovakia, Romania, France, Brazil, Trinidad & Tobago, Fiji, Tunisia, Gambia, Hungary, Zimbabwe, Mongolia, Ghana, Egypt, Czech Republic, Azerbaijan, Poland, Greece, Costa Rica, Kosovo, New Zealand, Croatia, Puerto Rico, Tanzania, Somalia.
Major Exporting Areas: 301 Stainless Steel Flanges Manufacturers / Suppliers / Stockist in Moscow, Seoul, Montreal, Dubai, Kuala Lumpur, Aberdeen, Tehran, Bogota, Melbourne, Abu Dhabi, Edmonton, Ho Chi Minh City, Bangkok, Toronto, Muscat, Milan, Busan, Mexico City, Perth, Santiago, Rio de Janeiro, London, Karachi, Los Angeles, Manama, Sydney, Riyadh, New York, Jeddah, Houston, Jakarta, Brisbane, Algiers, Kuwait City, Hanoi, Doha, Al Jubail, Cairo, Caracas, Lagos, Al Khobar, Madrid, Singapore, Calgary, Colombo, Ulsan, Istanbul, Dammam, Dallas, Ankara, Sharjah, Vung Tau.