Ninthore Overseas is one of the Leading Manufacturer And Exporter Of Stainless Steel 904L Flanges, where fractional distillation of tall oil often needs better material or even the more frequently used. In these hot concentrated caustic solutions, the corrosion resistance of these Stainless Steel 904L Slip On Flanges is mainly determined by the nickel content of the material. With a nickel content of 25 %, Stainless Steel 904L Threaded Flanges has proven to be a good alternative to most conventional stainless steels.

Conventional stainless steels such as these Stainless Steel UNS N08904 Weld Neck Flanges are susceptible to chloride stress corrosion cracking (SSC) under certain conditions. Resistance to SSC in Stainless Steel 904L Blind Flanges increases with the increased content of nickel and molybdenum. Therefore, the higher performance austenitic stainless steels such as these Stainless Steel 904L Socket Weld Flanges have very good resistance to SSC.

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Stainless Steel 904L Lap Joint Flanges shows resistance to SSC in a chloride solution under evaporative conditions, where high performance austenitic steels clearly outperform. These Stainless Steel 904L Ring Joint Type Flanges can be easily welded and processed by standard shop fabrication practices. Working temperatures of 1562 Degree F – 2102 Degree F (850 Degree C – 1150 Degree C) in Stainless Steel 904L Spectacle Blind Flanges are recommended for hot working processes. These Stainless Steel 904L Nippo Flanges should be solution annealed at 1940 Degree F – 2084 Degree F (1060 Degree C – 1140 Degree C).

Stainless Steel 904L Pipe Flanges Specifications
Specifications : ASTM B649 / ASME SB649
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 904L Pipe Flanges Chemical Composition

Grade C Mn Si P S Cr Mo Ni Cu
SS 904L 0.020 max 2 max 1.00 max 0.040 max 0.030 max 19.00 – 23.00 4.00 – 5.00 max 23.00 – 28.00 1.00 – 2.00

Stainless Steel 904L Plate Flanges Mechanical Properties

Density Melting Point Tensile Strength Yield Strength (0.2%Offset) Elongation
7.95 g/cm3 1350 °C (2460 °F) Psi – 71000 , MPa – 490 Psi – 32000 , MPa – 220 35 %

Equivalent Grades for 904L Stainless Steel Industrial Pipe Flanges

SS 904L 1.4539 N08904 SUS 904L 904S13 STS 317J5 Z2 NCDU 25-20 X1NiCrMoCu25-20-5

SS 904L 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 904L 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)