Ninthore Overseas is one of The Leading Manufacturer And Exporter Of High Quality Stainless Steel 321 Tubes, which is non – harden able by heat treatment. We supply Stainless Steel 321 Tubes in a variety of lengths and widths and can custom cut to your exact specifications. Anneal Heat this Stainless Steel 321H Tubes from 1050 Degree C to 1150 Degree C and then cool in air, where this ensures maximum ductility of the steel. These Stainless Steel 321 Seamless Tubes is non magnetic in the annealed condition, but can become mildly magnetic following heavy cold working.

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Stainless Steel 321 Tubes

Stainless Steel 321 Tubes

Other corrosive compounds in the hot atmosphere such as water and sulfur compounds in Stainless Steel 321H Welded Tubes will significantly reduce the maximum service temperature. Stainless Steel 321 EFW Tubes is readily welded by all common methods including submerged arc. Maximum stabilization in Stainless Steel 321H ERW Tubes is accomplished by annealing between 1750 ° F and 1850 ° F. Our Stainless Steel 321 Round Tubes is often used in woven or welded screens for high temperature mineral processing.

These Stainless Steel 321H Square Tubes is extremely resistant to inter-granular corrosion and has very good corrosion resistance in weld areas. Our Stainless Steel 321 Rectangular Tubes is also used in waste treatment including thermal oxidizers. Hardening rate of these Stainless Steel 321H Electropolish Tubes makes it less machinable than 410 stainless steel, but similar to Alloy 304.

SS 321/321H Welded Tubes Specifications
Specifications : ASTM A/ASME SA213/A249/A269
Dimensions : ASTM, ASME and API
SS 321 Tubes Size
: 1/8″NB TO 30″NB IN
Thickness : 0.35mm to 6.35mm OD in thickness ranging from 0.1mm to 1.2mm.
Schedule : SCH20, SCH30, SCH40, STD, SCH80, XS, SCH60, SCH80, SCH120, SCH140, SCH160, XXS
Type : Seamless / ERW / Welded / Fabricated / LSAW Tubes
Form : Round, Square, Rectangular, Hydraulic Etc
Length : Single Random, Double Random & Cut Length.
End : Plain End, Beveled End, Treaded
321/321H Stainless Steel Tubes Available Sizes
NB Sizes Sch 5 Sch 10 Sch 40 Sch 80 Sch 160
1 1/4″
1 1/2″
2 1/2″
321/321H Stainless Steel Tube 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 Tubes 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 %
Equivalent Grades for 321/321H Stainless Steel Tubes
SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9
SS 321/321H Seamless /  Welded Tubes Application Industries
  • Off-Shore Oil Drilling Companies
  • Power Generation
  • Petrochemicals
  • Gas Processing
  • Specialty Chemicals
  • Pharmaceuticals
  • Pharmaceutical Equipment
  • Chemical Equipment
  • Sea Water Equipment
  • Heat Exchangers
  • Condensers
  • Pulp and Paper Industry
SS 321/321H Steel Tube Test Certificates

We at Ninthore Overseas provide Manufacturer TC (Test Certificate) in accordance to EN 10204/3.1B, Raw Materials Certificate, 100% Radiography Test Report, Third Party Inspection Report. We also provide Standard certificates like EN 10204 3.1 and additional requirement like. NACE MR 01075. FERRIT CONTENT as per norms if requested by clients.

• EN 10204/3.1B,
• Raw Materials Certificate
• 100% Radiography Test Report
• Third Party Inspection Report, etc

Material Testing
We at Ninthore Overseas ensure that all our materials go through strict quality tests before dispatching them to our clients.

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Flattening Test
• Micro and Macro Test
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test


• Commercial Invoice which includes HS Code
• Packing List including net weight and gross weight, number of boxes, Marks and Numbers
• Certificate of Origin legalized/attested by Chamber of Commerce or Embassy
• Fumigation Certificates
• Raw Material Test Reports
• Material Traceability Records
• Quality Assurance Plan (QAP)
• Heat Treatment Charts
• Test Certificates certifying NACE MR0103, NACE MR0175
• Material Test Certificates (MTC) as per EN 10204 3.1 and EN 10204 3.2
• Guarantee Letter
• NABL approved Laboratory Test Reports
• Welding Procedure Specification/Procedure Qualification Record, WPS/PQR
• Form A for the purposes of the Generalized System of Preferences (GSP)



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