Weld Neck Flanges – ASME/ANSI B16.5

VikTech Fittings is a globally recognized manufacturer, exporter, and supplier of high-quality ASME/ANSI B16.5 Weld Neck Flanges in Carbon Steel, Stainless Steel, Alloy Steel, Duplex, Super Duplex, and Special Alloys. These flanges feature a long tapered hub that provides excellent reinforcement, ensuring strength, leak-proof welding, and reliable performance in critical service applications.

Technical Specifications

ParameterSpecificationStandardASME/ANSI B16.5, B16.47 Series A/B, MSS-SP-44, API 605Size Range½” (DN15) to 48” (DN1200)Pressure RatingsClass 150, 300, 600, 900, 1500, 2500Facing TypesRF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face)Thickness / SchedulesSCH 10, SCH 20, SCH 40, SCH 60, SCH 80, SCH 160, XXSTesting & CertificationEN 10204 3.1/3.2, PMI Testing, Hydro Test, NACE MR0175, IBR/Third Party Inspection

Available Materials & Grades

Carbon Steel Weld Neck Flanges

• ASTM A105 / A105N

• ASTM A350 LF2 (Low Temperature)

• ASTM A694 F42 – F70 (High Yield)

Stainless Steel Weld Neck Flanges

• ASTM A182 F304 / 304L

• ASTM A182 F316 / 316L

• ASTM A182 F321 / 347

• Duplex Steel: UNS S31803 / S32205

• Super Duplex: UNS S32750 / S32760

Alloy & Special Grades

• ASTM A182 F11, F22 (Chrome Moly)

• Nickel Alloys (Inconel, Monel, Hastelloy, Alloy 20, Titanium)

Key Advantages

✔ Strong structural support for pipelines
✔ Excellent fatigue & corrosion resistance
✔ Leak-proof welded joint for high-pressure systems
✔ Withstands extreme temperature & pressure conditions
✔ Long service life with minimal maintenance

Applications

• Oil & Gas Transmission Pipelines

• Petrochemical & Refining Industries

• Power Generation & Boilers

• Marine & Offshore Equipment

• Fertilizer & Chemical Processing Plants

• Water Treatment & Desalination Units

Why Choose VikTech Fittings?

• In-house manufacturing with strict quality control

• Compliance with ASME, ANSI, DIN, EN, BS, ISO, JIS standards

• Custom sizes & special material grades available on request

• Global supply network with export to over 30 countries

• Trusted by EPC contractors, refineries, and OEMs