Stainless Steel 321 Pipes / 321H Stainless Steel Pipe

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Stainless Steel 321 Pipes / Stainless Steel 321H Pipes Manufacturer and Supplier

Stainless Steel 321 Pipes / 321H Stainless Steel Pipe Manufacturer and Supplier

Metinox Overseas is a trusted name in the global piping industry, offering premium quality 321 stainless steel pipe solutions designed for demanding industrial environments. As a leading supplier and exporter, we specialize in manufacturing high-performance stainless steel 321 pipe and 321h stainless steel pipe that deliver excellent resistance to oxidation, corrosion, and high-temperature conditions. Our products are widely used in industries such as petrochemical, power generation, heat exchangers, and refineries.

Our range includes ss 321 pipe, 321 stainless pipe, and 321h stainless steel pipe in various sizes, thicknesses, and specifications to meet diverse application needs. Manufactured in compliance with international standards like ASTM A312 TP321, SA312 TP321, and other relevant grades, our pipes ensure superior durability, strength, and long service life. We also provide ss 321 seamless pipe options for applications requiring enhanced structural integrity and pressure handling capabilities.

At Metinox Overseas, quality is our top priority. Each 321ss pipe undergoes strict testing and inspection to ensure it meets industry standards and customer expectations. Our advanced manufacturing processes and experienced team enable us to deliver consistent quality and timely shipments across domestic and international markets.

Whether you are looking for standard 321 pipe solutions or specialized 321h pipe for high-temperature applications, Metinox Overseas is your reliable partner. With a strong commitment to excellence, competitive pricing, and customer satisfaction, we continue to be a preferred choice for tp321 piping solutions worldwide.

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Manufacturing Standards, Applications & Quality Testing

The welded 321 stainless steel pipe cannot be used in highly oxidizing environments due to the risk of knifeline attack. In such conditions, titanium stabilization may not perform efficiently across high-temperature welding arcs, which limits the use of 321h stainless steel pipe as a welding consumable. However, stainless steel 321 pipe performs exceptionally well in applications operating above 500°C, where resistance to sensitization and intergranular corrosion is critical. The ss 321 pipe is widely preferred in high-temperature environments, while 321h pipe offers enhanced creep strength and stress rupture resistance, making it suitable for prolonged thermal exposure.

The 321 stainless pipe and 321 stainless steel pipe range from Metinox Overseas is manufactured in accordance with international standards such as ASTM A312 TP321, SA312 TP321, and other relevant specifications. Our 321ss pipe products are available in sizes ranging from 1/8 NB to 30 NB, with ERW pipes from 1/2 NB to 24 NB, ss 321 seamless pipe from 1/2 NB to 16 NB, and EFW pipes from 6 NB to 100 NB. Standard schedules include SCH 20, 30, 40, 60, 80, 120, 140, 160, STD, XS, and XXS. These 321 pipe products are available in round, square, rectangular, and hydraulic forms, with manufacturing options such as welded, ERW, LSAW, seamless, and fabricated types. Lengths include single random, double random, and cut lengths with threaded, beveled, or plain ends.

All tp321 and a312 tp321 piping products undergo rigorous quality checks, including PMI testing, intergranular corrosion testing, flattening and flaring tests, macro and micro examinations, radiographic testing, hydrostatic testing, as well as chemical and mechanical testing. These stringent quality control processes ensure that every stainless steel 321 pipe and 321h stainless steel pipe delivers reliable performance and durability in critical industrial applications.

Stainless Steel 321 Pipe & 321H Stainless Steel Pipe Specification

The Stainless Steel 321 Pipe & 321H Stainless Steel Pipe are manufactured as per international standards like ASTM A312 and ASME SA312, available in seamless, welded, and ERW forms with various sizes and schedules.

Feature Details
Specifications ASTM A312, A358 / ASME SA312, SA358
Outside Diameter 6.00 mm OD up to 914.4 mm OD, Sizes up to 24" NB available Ex-stock, OD Size Steel Tubes available Ex-stock
Thickness Range 0.3mm, 50 mm, SCH 5, SCH10, SCH 40, SCH 80, SCH 80S, SCH 160, SCH XXS, SCH XS
Type Seamless / ERW / Welded / Fabricated / CDW
Form Round Pipes, Square Pipes, Rectangular Pipes
Length Single Random, Double Random & Required Length
End Plain End, Beveled End, Treaded
Outside Finish 2B, No.4, No.1, No.8 Mirror Finish for Stainless Steel Pipes, Finish as per customer Requirements
Delivery Condition Annealed and Pickled, Polished, Bright Annealed, Cold Drawn
EN 10216-5 EN 10216 321/321H Seamless Steel Pipe, EN 10216-5 1.4541 / 1.4878 Seamless Steel Pipes for pressure purposes
EN 10217-7 EN 10217 321/321H Welded Steel Pipe, Steel EN 10217-7 1.4541 / 1.4878 Welded Pipes for pressure purposes

Stainless Steel UNS S32100 / UNS S32109 Pipes Equivalent Grades

The Stainless Steel 321 Pipe & 321H Stainless Steel Pipe correspond to UNS S32100 and UNS S32109 grades, equivalent to EN 1.4541 / 1.4878, offering excellent high-temperature strength and corrosion resistance.

STANDARD UNS WERKSTOFF NR. EN JIS
SS 321 S32100 1.4541 X6CrNiTi18-10 SUS 321
SS 321H S32109 1.4878 X12CrNiTi18-9 SUS 321H

Stainless Steel 321 Pipe & 321H Stainless Steel Pipe Chemical Composition

The Stainless Steel 321 Pipe & 321H Stainless Steel Pipe contain chromium, nickel, and titanium, which enhance oxidation resistance and prevent intergranular corrosion in elevated temperature applications.

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

ASME SA312 SS TP321 / ASME SA312 SS TP321H Mechanical Properties

The Stainless Steel 321 Pipe & 321H Stainless Steel Pipe exhibit high tensile strength, improved creep resistance, and excellent durability, making them suitable for extreme thermal environments.

Property Value (Metric) Value (Imperial)
Tensile Strength (min) 515 MPa 75,000 Psi
Yield Strength (min) 205 MPa 30,000 Psi
Elongation (%) 35 % -
Hardness (Rockwell B) 95 max -
Hardness (Brinell) 217 max -

Applications & Uses of Stainless Steel 321 Pipe & 321H Stainless Steel Pipe

The Stainless Steel 321 Pipe & 321H Stainless Steel Pipe are widely used in heat exchangers, petrochemical plants, refineries, power generation, and high-temperature processing equipment.

Aerospace

These are extensively used in jet engines, piston engine exhausts and aircraft exhaust stacks because they are highly resistant to high temperatures.

Oil & Gas Refineries

These are perfect in applications where there are high pressure steam pipes, flare stacks, and catalytic cracking units that have heat and volatile gases.

Chemical Processing

Applied in reactors, chemical products manufacture and heat exchangers in which aggressive organic and inorganic chemicals are employed.

Power Generation

Power generation requires the essential of boiler tubes, superheater tubes and steam lines in both coal and nuclear generation plants where creep strength is crucial.

Waste Treatment

This is used in fireplants and waste-to-energy plants due to their resistance to oxidation and scaling in high temperatures.

Automotive Industry

It is used in fast exhaust systems, turbocharger housing, and manifold.

Why Choose Metinox Overseas?

Being a prominent producer and exporter of Stainless Steel 321/321H pipes, Metinox Overseas provides a combination of the engineering and reliability of the global logistics:

  • Precision Stabilization: To assure that our pipes are impervious to intergranular corrosion following welding or high-heat operation, we make sure that our pipes have the right proportions of Titanium and Carbon.
  • High-Quality Testing Facilities: Each batch is tested thoroughly, such as PMI (Positive Material Identification), Intergranular Corrosion (IGC) tests in accordance with the ASTM A262 Practice E and Radiography.
  • Large Ex-Stock Warehousing: We have one of the largest ex-stock warehouse of Seamless and Welded 321H pipes, which could be dispatched immediately to meet an urgent maintenance or project deadline.
  • Global Standard Compliance: Our pipes are produced in compliance with ASTM A312, A358, and ASME SA312 standards that guarantee their suitability to the demands of the international EPC contractors.
  • Customization Options: Starting with special orders such as SCH 160 or XXS to individual lengths and special end-finishes (threaded/beveled), we make each order to the drawing board of the client.

Export Destinations - USA, Europe, Middle East, LATAM

We are a major exporter of SS 321/321H pipes to high-consumption regions globally:

  • Middle East: UAE (Dubai, Abu Dhabi), Saudi Arabia (Riyadh, Jubail), Qatar, Oman, Kuwait.
  • Americas (LATAM & USA): USA (Houston, Texas), Brazil, Mexico, Argentina, Canada.
  • Europe: Germany, Italy, UK, Netherlands, Belgium, Spain.
  • Asia & Africa: Singapore, Malaysia, South Africa, Nigeria, Egypt, Thailand.

Looking for High-Quality Stainless Steel 321/321H Pipes?

Choose Metinox Overseas - Your Reliable Stainless Steel Pipe Manufacturer & Exporter.

Let us support your projects with quality, precision, and performance.

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SS 321/321H Pipe Delivery Time & CIF Pricing by Country

The Metinox Overseas has designed an effective global logistics system that has supported it to deliver ASTM A312 TP321/321H Pipes to its customers in time locations all over the world. Our INCOTERs are also custom made to suit your purchasing requirements including: CIF (Cost, Insurance and Freight), FOB (Free on Board), CFR (Cost and Freight) and DDP (Delivered Duty Paid). We also have strategic partnerships with shipping lines and other freight forwarders and this provides us with effective freight rates and a stable transit time to the entire major ports in the world.

Destination Region Major Ports / Cities Estimated Delivery Time Typical CIF Terms
Middle East (GCC) Dubai (Jebel Ali), Dammam, Doha, Muscat, Kuwait 7 - 10 Days CIF Dubai / CIF Dammam / CIF Doha
Europe Rotterdam, Hamburg, Antwerp, Southampton, Genoa 20 - 25 Days CIF Rotterdam / CIF Hamburg
USA & Canada Houston, New York, Los Angeles, Long Beach, Vancouver 25 - 30 Days CIF Houston / CIF New York / CIF LA
Latin America (LATAM) Santos (Brazil), Veracruz (Mexico), Buenos Aires, Callao 30 - 35 Days CIF Santos / CIF Veracruz
Southeast Asia Singapore, Port Klang, Bangkok, Manila, Jakarta 10 - 15 Days CIF Singapore / CIF Port Klang
Africa Lagos, Durban, Mombasa, Dar es Salaam, Alexandria 15 - 20 Days CIF Lagos / CIF Durban

Note: Delivery time is estimated and it depends on shipping line timeframes, congestion at ports, and clearance of customs. In urgent cases we also provide air freight services whereby the delivery time should be up to 5-7 days to other major international airports. Request our export department to offer tailor-made logistic services and the latest CIF prices on SS 321 Seamless Pipes, SS 321H Welded Pipes and SS 321/321H ERW Pipes.

Other types of Stainless Steel 321 Pipe / 321H Stainless Steel Pipe

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Supplier and Exporter of SS 321 Pipe / 321H SS Pipes in Cities Like

Bhopal, Mumbai, Hyderabad, Gimhae-si, Chandigarh, Calgary, Lagos, Bengaluru, Secunderabad, Riyadh, Toronto, Ho Chi Minh City, Noida, Brisbane, Abu Dhabi, Vung Tau, Algiers, Baroda, Kolkata, Ulsan, Kuwait City, Doha, New York, Los Angeles, Perth, Kanpur, Dubai, London, Jeddah, Navi Mumbai, Singapore, Chennai, Edmonton, Milan, Ankara, Chiyoda, Bogota, Gurgaon, Rajkot, Faridabad, La Victoria, Indore, Mexico City, Al Khobar, Dallas, Ernakulam, Ludhiana, Houston, Colombo, Caracas, Petaling Jaya, Tehran, Howrah, Thane, Moscow, Busan, Aberdeen, Jakarta, Ahvaz, Coimbatore, Vadodara, Ranchi, Dammam, Santiago, Atyrau, Courbevoie, Geoje-si, Nashik, Haryana, Al Jubail, Surat, Bangkok, Karachi, Muscat, Madrid, Sharjah, Istanbul, Hong Kong, Lahore, Pune, Thiruvananthapuram, Port-of-Spain, Rio de Janeiro, Manama, Ahmedabad, Sydney, Seoul, Cairo, Melbourne, Pimpri-Chinchwad, Kuala Lumpur, Visakhapatnam, Jamshedpur, Montreal, New Delhi, Nagpur, Granada, Jaipur, Hanoi.

Supplier and Exporter of Stainless Steel 321/321H Pipes in Countries Like

United Kingdom, Costa Rica, Mexico, Netherlands, India, Chile, Philippines, Ukraine, China, Kuwait, Hong Kong, Gambia, Portugal, Azerbaijan, Ecuador, Canada, Venezuela, Nigeria, Singapore, Iraq, Argentina, Kenya, Serbia, Greece, Mexico, Nepal, Yemen, Bangladesh, Ireland, Bulgaria, France, Italy, Israel, Angola, Croatia, Pakistan, Estonia, Algeria, Libya, Poland, Bahrain, Mongolia, Norway, Bhutan, Jordan, Lebanon, Puerto Rico, Colombia, Austria, Lithuania, Indonesia, Iran, Sweden, Iran, South Korea, Thailand, Nigeria, Namibia, New Zealand, Morocco, Finland, Saudi Arabia, Germany, Belarus, Gabon, Switzerland, Denmark, Sri Lanka, Australia, Hungary, Czech Republic, Russia, Zimbabwe, Japan, Afghanistan, Malaysia, South Africa, Chile, Slovakia, Macau, Romania, Egypt, Trinidad & Tobago, Tunisia, Peru, Oman, Taiwan, Brazil, Tibet, Poland, Qatar, Ghana, Turkey, United Arab Emirates, Vietnam, United States, Kazakhstan, Bolivia, Spain, Belgium.

Frequently Asked Questions (FAQ)

The difference in the carbon content is the most significant. Although SS 321 is the grade, SS 321H contains a high amount of carbon (0.04% - 0.10%) that gives it much better creep strength and much better mechanical strength at temperatures over 1000-C (537-C).

The addition of titanium is done as a stabilizing agent. It is unable to react with chromium, but with carbon to produce titanium carbides. This stops the chromium depletion of the grain boundaries thus rendering the pipe very resistant to intergranular corrosion (sensitization).

Yes, SS 321, as well as 321H, are highly welded. Nevertheless, due to the inability of titanium to transfer across a welding arc, it is advisable to implement SS 347 (Niobium stabilized) filler materials when welding 321 series pipes so that the weld can be stabilized.

SS 321H may be used in intermittent service up to 1500-F (816-C). It has high-carbon chemistry, which controls its structural integrity and holds back against oxidation significantly better than the usual 304/304L grades at these extremes.

SS 321 is non-magnetic in the annealed state, like any other austenitic grade. It can however get a little magnetic in case the material is subjected to cold working in the process of manufacturing the pipes.

Yes, all of our SS 321/321H pipes are accompanied by either a 3.1 or 3.2 Mill Test Certificate as required by EN 10204 which gives information about chemical composition, mechanical properties and the results of all the non-destructive tests.

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