Ninthore Overseas is one of the Leading Manufacturer And Exporter of Stainless Steel 446 Flanges, which is available in dissimilar sizes and shapes for our clients. Our Stainless Steel 446 Slip On Flanges is an age – hardening martensitic stainless combining high strength with the corrosion resistance of stainless steel. Unlike conventional martensitic stainless steels, these Stainless Steel 446 Threaded Flanges is quite weldable, where hardening is achieved by a short – time and simple low – temperature treatment.

The strength, corrosion resistance and simplified fabrication can make our Stainless Steel 446 Weld Neck Flanges a cost – effective replacement for high strength carbon steels as well as other stainless grades. At the solution treating temperature, 1900 Degree F, these Stainless Steel UNS S44600 Blind Flanges is austenitic but undergoes transformation to a low – carbon martensitic structure during cooling to room temperature. This transformation in our Stainless Steel 446 Socket Weld Flanges is not complete until the temperature drops to 90 Degree F.

Stainless Steel 446 Flanges | Stainless Steel 446 Flanges | Stainless Steel 446 Flanges | Stainless Steel 446 Flanges | Stainless Steel 446 Flanges | Stainless Steel 446 Flanges | Stainless Steel 446 Flanges
Subsequent heating of these Stainless Steel 446 Lap Joint Flanges to temperatures of 900 Degree F – 1150 Degree F for one to four hours precipitation strengthens the alloy. This hardening treatment in our Stainless Steel 446 Ring Joint Type Flanges as well tempers the martensitic structure, increasing ductility and toughness. These Stainless Steel 446 Spectacle Blind Flanges is an austenitic heat resistant alloy with oxidation resistance to 1900 Degree F under constant temperature conditions.


Stainless Steel 446 Pipe Flanges Specifications
Specifications : ASTM A182 / ASME SA182
Size : 1/2″ (15 NB) to 48″ (1200NB)
: ANSI/ASME B16.5, B 16.47 Series A & B, B16.48, BS4504, BS 10, EN-1092, DIN, etc.
Class / Pressure : 150#, 300#, 600#, 900#, 1500#, 2500#, PN6, PN10, PN16, PN25, PN40, PN64 etc.
Standard : ANSI Flanges, ASME Flanges, BS Flanges, DIN Flanges, EN Flanges, etc.

SS 446 Pipe Flanges Chemical Composition

Grade C Mn Si P S Cr Mo Ni N Fe
SS 446 0.2 max 1.5 max 0.75 max 0.04 max 0.030 max 23 – 30 0.50 max 0.10 – 0.25 Balance

Stainless Steel 446 Plate Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.5 g/cm3 1510 °C (2750 °F) Psi – 75,000 , MPa – 485 Psi – 40,000 , MPa – 275 20 %

Equivalent Grades for 446 Stainless Steel Industrial Pipe Flanges

SS 446 1.4762 S44600

SS 446 Flanges 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

Stainless Steel 446 Pipe Flanges 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)