Ninthore Overseas is One Of The Leading Manufacturer And Exporter Of High Quality Stainless Steel 321 Nipple, which cannot be hardened by thermal treatment. Stainless Steel 321 Nipple is stabilized against chromium carbide formation by the addition of titanium. However, welded Stainless Steel 321H Nipple must never be used in highly oxidizing environments as it is liable to ‘Knife-line’ attack. Characterized by high corrosion resistance in general atmospheric corrosive environments, SS 321 Hexagon Reducing Nipple exhibits excellent resistance to most oxidizing agents. This heat resistant grade of SS 321H Hexagon Nipple has a maximum dry air service temperature of 850 º C.

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stainless Steel 321 Nipple

stainless Steel 321 Nipple

Like other austenitic stainless steels, Alloy 321 One End Threaded Nipple works harden quickly and may require annealing after severe forming. Alloy 321H Both End Threaded Nipple is stabilized against weld heat affected zone (HAZ) inter-granular corrosion. The titanium in this 321 Stainless Steel Nipple forms insoluble and stable carbide, which ties up all the carbon in the alloy and therefore prevents it from precipitating as chromium carbides.

Our 321H Stainless Steel Nipple is readily welded by most standard processes and is very ductile and forms easily. This Grade 321 Concentric Swaged Nipple must be water quenched or fully annealed after working to re-attain maximum corrosion resistance. The following are some of the major applications of our Grade 321H Eccentric Swaged Nipple, such as aircraft exhaust stacks and manifolds.

Stainless Steel 321/321H Nipple
Specifications : ASTM A182 & ASME SA182
Size : 1/4″ to 4″
Class : 2000 LBS, 3000 LBS, 6000 LBS, 9000 LBS
SS 321/321H Nipple 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 Nipple 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 Nipple
SS 321 1.4541 S32100 SUS 321 X6CrNiTi18-10
SS 321H 1.4878 S32109 SUS 321H X12CrNiTi18-9
Stainless Steel 321/321H Nipple 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 Nipple 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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