Ninthore Overseas is One Of The Leading Manufacturer And Exporter of Alloy Steel F11 Flanges, where its elevated strength may require higher forming pressures. Annealing of Alloy Steel F11 Slip On Flanges is done by soaking thoroughly at 1725 Degree F – 1850 Degree F (941 Degree C – 1010 Degree C), water quenched, which can only be hardened by cold work. As is true of other heat treating procedures, aging of Alloy Steel F11 Threaded Flanges is a time / temperature dependent reaction, where temperature is more important than time.

 Alloy Steel F11 Weld Neck Flanges was dеsіgnеd for mахіmum rеsіstаnсе tо асіd аttасk аnd dеmоnstrаtеs suреrіоr rеsіstаnсе tо strеss – соrrоsіоn сrасkіng іn bоіlіng 20 % tо 40 % sulphurіс асіd, аnd аlsо hаs ехсеllеnt gеnеrаl соrrоsіоn rеsіstаnсе tо sulfurіс асіd аnd tо сhlоrіdе strеss соrrоsіоn сrасkіng. Alloy Steel F11 Blind Flanges hаs gооd mесhаnісаl рrореrtіеs аt bоth аmbіеnt аnd еlеvаtеd tеmреrаturеs, uр tо аррrохіmаtеlу 930 Degree F (500 Degree С) аnd іs rеаdіlу fаbrісаtеd bу usuаl іndustrіаl рrосеssеs.

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Because Alloy Steel F11 Socket Weld Flanges is essentially carbon – free, protective atmospheres are not required during annealing or aging. Alloy Steel F11 Lap Joint Flanges are also exceptionally stable during annealing and aging, offering predictable, uniform shrinkage on all dimensions. Alloy Steel F11 Ring Joint Type Flanges possesses a higher resistance to precipitation of ferrite and sigma phases on cooling and welding than other stainless steels containing molybdenum.

Alloy Steel F11 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.

Alloy Steel F11 Pipe Flanges Chemical Composition

Grade C Mn Si P S Cr Mo
Alloy Steel F11 0.5-0.15  0.3-0.6 0.5-1.0  0.03 0.03 1.0-1.5 0.44-0.65

Alloy Steel F11 Plate Flanges Mechanical Properties

Tensile Strength Yield Strength (0.2%Offset) Elongation
205 415 20 %

Alloy Steel F11 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

Alloy Steel F11 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)