Introduction

Stainless Steel 321 pipe fittings are celebrated for their excellent resistance to intergranular corrosion and high-temperature stability, thanks to titanium stabilization. Widely used in burners, exhaust systems, and chemical processing, SS 321 fittings endure challenging conditions without compromising integrity.

Mcneil Instruments is a trusted manufacturer, supplier, and exporter of stainless steel 321 pipe fittings in India, delivering precision-engineered components that meet global standards and diverse industrial applications.

Why Stainless Steel 321 Stands Apart

  • Contains 17–19% Chromium, 9–12% Nickel, and Titanium (Ti) to stabilize against carbide precipitates.
  • Ideal for welding services up to 870 °C where creep resistance is needed.
  • Provides strong oxidation and corrosion resistance in high-heat environments.

Manufacturing & Testing Process

  • Raw Material from certified mills conforming to ASTM A403 WP321.
  • Forming: Forged or formed to produce elbows, tees, reducers, and caps.
  • Heat Treatment: Solution annealed and quenched per specifications.
  • Finishing: Deburring, threading, and passivation for clean finish.
  • Quality Checks: Dimensional inspections, NDT (UT or RT), mechanical testing, and PMI. Certified via MTCs, EN 10204, and IBR optional.

Technical Specifications & Mechanical Properties of Stainless Steel 321 Pipe Fittings

SpecificationDetails
StandardASTM A403 WP321 / ASME B16.9 / B16.11
Material GradeStainless Steel 321 (Titanium-stabilized Austenitic)
UNS DesignationS32100
TypeSeamless / Welded / Fabricated
FormElbow, Tee, Reducer, Cap, Cross, Stub End, Union
Manufacturing StandardsASTM, ASME, ANSI, MSS-SP
Stabilizing ElementTitanium (Ti)
ApplicationsHeat exchangers, refineries, chemical plants, power plants

Mechanical Properties of Stainless Steel 321 Pipe Fittings

PropertyValue
Tensile Strength≥ 515 MPa (75 ksi)
Yield Strength≥ 205 MPa (30 ksi)
Elongation≥ 35%
Hardness (HRB)≤ 95
Impact ResistanceExcellent, especially at high temperatures

Stainless Steel 321 Pipe Fittings Dimensions & Wall Thickness Chart

Size (NPS)Outside Diameter (mm)Wall Thickness (mm) (SCH 10S–SCH XXS)
½″21.31.65 – 5.54
1″33.42.77 – 9.09
2″60.33.91 – 15.09
4″114.36.02 – 21.44
6″168.37.11 – 28.58
8″219.18.18 – 33.32
10″273.09.27 – 38.89

Note: Custom wall thickness and dimensions available on request.

Certifications for Stainless Steel 321 Pipe Fittings

CertificationDetails
ASTM A403 / ASME B16.9Material and dimensional standards
EN 10204 3.1 / 3.2Mill Test Certificates / Third-party inspection available
IBR CertifiedFor boiler and pressure vessel applications
NACE MR0175 / MR0103For sour service (if applicable)
PED CertifiedFor EU-compliant pressure systems
ISO 9001:2015Quality Management System Compliance

Available Sizes & Specifications of Stainless Steel 321 Pipe Fittings

SpecificationDetails
Size Range½″ NB to 24″ NB (and custom sizes on request)
TypeSeamless, Welded, Buttweld, Forged
Wall ThicknessSCH 10S, SCH 40, SCH 80, SCH 160, SCH XXS
End TypesBeveled End (BE), Plain End (PE), Threaded End (TE)
Forms Available90° / 45° Elbow, Tee, Concentric/Eccentric Reducer, Cap, Stub End
FinishPickled, Annealed, Polished, Bead-blasted
Heat TreatmentSolution Annealed as per standard

Global Reach of Mcneil Instruments: SS 321 Pipe Fittings

  • In Saudi Arabia, Mcneil is a trusted manufacturer of SS 321 pipe fittings, serving high-temp petrochemical units.
  • From Qatar, we act as a key exporter, supplying corrosion-resistant fittings for exhaust and boiler systems.
  • In Nigeria, Mcneil serves as a reliable supplier of SS 321 fittings for chemical and power plants.
  • As an exporter in Ghana, Mcneil provides fittings for thermal installations and industrial kitchens.
  • Mcneil functions as a leading manufacturer and supplier in Texas, providing SS 321 fittings for aerospace and refinery projects.
  • In Chicago, we are a noted exporter of SS 321 pipe fittings for HVAC and fire protection systems.
  • Our presence in Malaysia includes roles as supplier and exporter, delivering fittings for marine and industrial applications.
  • In Singapore, Mcneil is recognized as a manufacturer and exporter, catering to shipbuilding and petrochemical industries.In Brazil, our company is a distinguished supplier, providing sustainably sourced SS 321 fittings for food and beverage plants.

Conclusion

Stainless Steel 321 pipe fittings offer exceptional performance in high-temperature applications thanks to their titanium-stabilized construction. With Mcneil Instruments as your manufacturer, supplier, and exporter, you gain access to expertly engineered, certified fittings backed by global reach.