Ninthore Overseas is one of the leading Manufacturer And Exporter of Stainless Steel 347 Flanges, which combines excellent mechanical properties over a wide temperature range with superior oxidation and corrosion resistance. The excellent relaxation resistance of Stainless Steel 347 Slip On Flanges is a factor in its successful use for springs at temperatures up to 1100 Degree F. Because of these properties, Stainless Steel 347 Threaded Flanges is specified for many fastener applications where superior performance is required under varying environmental conditions.

They were made from hot – rolled, annealed, and joined with diameter in Stainless Steel 347 Weld Neck Flanges by the gas tungsten – arc process. These heat treatments and the applications for which Stainless Steel UNS S34700 Blind Flanges are intended are described in the Mechanical Properties. The microstructure of Stainless Steel 347 Socket Weld Flanges, especially with regard to the effects of heat treatment, has been extensively studied and reported. 

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Stainless Steel 347 Lap Joint Flanges can be strengthened in two ways: (1) by solution treating and age hardening or (2) by cold working and age hardening only. Stainless Steel 347 Ring Joint Type Flanges is an age – harden able austenitic material, where weldments were found to have room – temperature fatigue strength. Strength of Stainless Steel 347 Spectacle Blind Flanges is largely dependent on the precipitation of a gamma prime phase during heat treatment. In comparable tests, Stainless Steel 347 Spacer Flanges had fatigue strength.

Stainless Steel 347 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 347 Pipe Flanges Chemical Composition

Grade C Mn Si P S Cr Cb Ni Fe
SS 347 0.08 max 2.0 max 1.0 max 0.045 max 0.030 max 17.00 – 20.00 10xC – 1.10 9.00 – 13.00 62.74 min

Stainless Steel 347 Plate Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
8.0 g/cm3 1454 °C (2650 °F) Psi – 75000 , MPa – 515 Psi – 30000 , MPa – 205 35 %

Equivalent Grades for 347 Stainless Steel Industrial Pipe Flanges

SS 347 1.4550 S34700 SUS 347 08Ch18N12B X6CrNiNb18-10

SS 347 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 347 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)