A694 F52 / F60 / F65 High-Yield Carbon Steel Flanges

High Strength: Minimum yield strength ranging from 360 MPa (F52) to 450 MPa (F65), significantly higher than A105 (250 MPa), allowing for thinner wall sections and reduced weight.

Low-Temperature Impact Toughness: Charpy V-Notch impact tested at temperatures from -20°C to -46°C depending on grade and supplementary requirements.

Excellent Weldability: Controlled chemistry and carbon equivalent (CE) ensure good weldability for field pipeline welding.

NACE MR0175 / ISO 15156 Compliant: Available with hardness control and impact testing for sour service applications.

Full Range of Types: Weld neck (WN), blind (BL), swivel ring (S/R), reducing flanges, and long weld neck (LWN).

Pressure Ratings: Available in Class 150, 300, 400, 600, 900, 1500, and 2500.

International Certifications: Flanges can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK for offshore applications.

These standards ensure that our A694 high-yield flanges meet global requirements for high-pressure gas transmission and pipeline systems.

Note: Carbon Equivalent (CE) = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15. Lower CE values improve weldability for pipeline field welding.

Impact Test Requirements (Charpy V-Notch):

Heat Treatment Condition:
All A694 high-yield flanges are normalized or normalized and tempered (N+T) . This heat treatment refines the grain structure, relieves internal stresses from forging, and ensures consistent mechanical properties. For NACE MR0175 compliance, hardness is controlled to ≤187 HBW.

Delivery Condition: Flanges are normally supplied in normalized condition. Upon request, normalized and tempered (N+T) can be provided for improved toughness.

*Reference: ASME B16.5 for carbon steel. These ratings are based on the material strength and apply to all A694 grades (F52/F60/F65) due to their higher strength.*

Standard Dimensions: ASME B16.5 for sizes up to 24″, and ASME B16.47 Series A/B for large diameters up to 60″.

Raw Material Selection: High-quality A694 grade-specific billets from certified mills with certified chemistry and carbon equivalent verification. Material traceability maintained from melt to finished flange.

Cutting & Heating: Material cut to precise weight using band saws, then induction-heated to forging temperature (1100–1200°C).

Forging: Hot forged using hydraulic presses (3000–8000 tons) with controlled reduction ratios to ensure proper grain flow direction.

Heat Treatment: Normalized (heated to 890–950°C, air cooled) or normalized and tempered (N+T) to achieve required mechanical properties.

Hardness Control: For NACE/sour service applications, hardness limited to ≤187 HBW (Rockwell B ≤90) per NACE MR0175.

Machining: CNC lathes and milling machines produce precise dimensions, bolt holes, and facing surfaces.

Surface Finishing: Raised face serration, flat facing, or RTJ groove machining per ASME B16.5 requirements.

Marking: Laser engraving or stamping with grade (F52/F60/F65), size (NPS), class, heat number, heat treatment condition, manufacturer identification, and standard.

Inspection & Testing: Dimensional check, PMI, hardness test, impact testing, and NDT as required.

Surface Treatment: Rust preventive oil coating or phosphate coating for corrosion protection during storage and transport.

Each A694 flange face is inspected for surface roughness, concentricity, and absence of defects.

Chemical Analysis: Positive Material Identification (PMI) upon request – typically certified by mill certificate.

Mechanical Testing: Tensile strength (grade dependent), yield strength (grade dependent), elongation (≥20-25%), reduction of area (≥40%).

Hardness Testing: 100% Brinell verification for NACE compliance (≤187 HBW for sour service).

Impact Testing: Charpy V-Notch at specified temperature (-20°C or -46°C), 27J average minimum.

Dimensional Inspection: OD, ID, bolt circle, bolt hole alignment, thickness, flatness using calibrated gauges and CMM.

Thread Inspection: NPT thread verification using GO/NO-GO gauges per ANSI B1.20.1 (if applicable).

NDT – Magnetic Particle Testing (MT): Upon request for surface defect detection on ferromagnetic material.

NDT – Ultrasonic Testing (UT): Upon request for internal flaws.

NDT – Liquid Penetrant Testing (PT): Upon request for non-magnetic applications.

Sour Service Qualification: NACE MR0175 documentation with hardness verification and optional HIC/SSC testing.

Third-Party Inspection: SGS, BV, DNV, TUV, LR, or ABS on customer request.

Natural Gas Transmission: High-pressure gas pipeline flanges, compressor station connections, meter station flanges, regulator station flanges.

High-Pressure Oil & Gas Gathering: Wellhead flowline flanges, manifold flanges, separation station connections.

Pipeline Valve Connections: Ball valve flanges, gate valve flanges, check valve flanges for high-pressure pipelines.

Compressor Stations: Suction and discharge flanges, bypass line flanges, pulsation dampener flanges.

Offshore Platforms: Riser flanges, topside high-pressure piping flanges (ABS/BV/DNV/LR certified).

Subsea Systems: Subsea manifold flanges, pipeline end termination (PLET) flanges, jumper connection flanges (ISO 13628-4 compliant).

Gas Storage Facilities: Injection and withdrawal wellhead flanges, high-pressure storage cavern connections.

Hydraulic Fracturing (Frac) Systems: High-pressure frac manifold flanges, well treatment iron flanges.

CO₂ Pipelines: Carbon dioxide transmission pipeline flanges (requires low-temperature impact testing).

Hydrogen Pipelines: High-pressure hydrogen transmission flanges (with appropriate material selection).

Small flanges (≤4″): Heavy-duty cartons with moisture barrier paper on pallets.
Medium flanges (6″–12″): Wooden crates with foam padding dividers, each flange wrapped in VCI paper.
Large flanges (≥14″): Individual wooden crates or steel-framed pallets with foam padding.

All shipments:

VCI paper interleaving between flanges

Plastic end caps for bore protection

Bolt hole protectors for RTJ facings

Rust preventive oil coating applied (unless phosphate coated)

Individual tagging: Grade (F52/F60/F65), size, class, heat number, heat treatment condition, standard, PO number

Waterproof shipping marks for export containers

Moisture barrier wrapping for sea freight

Womic Steel's Delivery Strengths:

Ready stock: Class 600 and 900 A694 flanges in sizes 6″–24″ (F52/F60) – dispatch within 24-48 hours.

Direct cooperation with global shipowners for the most competitive freight rates.

Professional loading by in-house teams using padded slings.

Complete documentation package including EN 10204 3.1 MTR, hardness test reports, impact test results, NACE compliance certificates (if required), and heat treatment charts.

Continuous cargo tracking and after-sales follow-up.

1. What is the difference between A694 F52, F60, and F65?
The grades indicate increasing yield strength: F52 (≥360 MPa), F60 (≥415 MPa), F65 (≥450 MPa). Higher strength allows for thinner walls, reduced weight, and higher pressure ratings. F65 is typically used for the most demanding high-pressure transmission lines.

2. Can A694 flanges be used for sour service (H₂S environments)?
Yes, with supplementary requirements. For NACE MR0175 / ISO 15156 compliance, the flanges must have hardness ≤187 HBW and be impact tested. Womic Steel can supply A694 flanges with full sour service certification including HIC and SSC test reports upon request.

3. What is the maximum size available for A694 flanges?
Up to 60″ diameter for blind flanges and 48″ for weld neck flanges per ASME B16.47. Larger custom sizes available upon request.

4. How do A694 flanges compare to A105 flanges for pipeline service?
A694 has significantly higher yield strength (360-450 MPa vs 250 MPa), controlled carbon equivalent for better weldability, and mandatory low-temperature impact testing. A694 is required for high-pressure gas transmission (typically Class 600 and above) where A105 may not provide sufficient strength.

5. Are A694 flanges suitable for subsea service?
Yes, A694 flanges are commonly used in subsea pipeline systems per ISO 13628-4. Additional requirements may include supplementary impact testing at lower temperatures, NACE compliance, and third-party witnessing.

6. What facing is recommended for high-pressure gas pipeline flanges?
Ring Type Joint (RTJ) facing with octagonal ring gasket is standard for high-pressure gas transmission (Class 600-2500) to ensure leak-tight sealing under high pressure and temperature cycling.

7. What is the typical lead time for A694 flanges?
Stock sizes (6″–24″, Class 600/900 WN RF in F52/F60): 2–4 days. Non-stock or special facings: 3–5 weeks. Large diameter B16.47 flanges (≥26″): 4–6 weeks depending on thickness and grade.

Complete Product Range: Weld neck, blind, swivel ring, reducing, and long weld neck flanges – one-stop sourcing for pipeline projects.

All Three Grades Available: F52, F60, and F65 – ready to meet your specific strength requirements.

Strict Quality Control: ISO 9001:2015, PED 2014/68/EU, and API Q1 certified facilities.

NACE MR0175 / ISO 15156 Compliant: Full documentation for sour service applications with HIC/SSC test reports on request.

Low-Temperature Impact Testing: Charpy V-Notch testing at -20°C to -46°C as specified, with certified test reports.

Hardness Control: 100% Brinell hardness verification for NACE compliance (≤187 HBW).

Pipeline Industry Experience: Proven supply record for major gas transmission projects worldwide.

Full Traceability: Heat number stamped on each flange – traceable back to original mill certificate.

Flexible Customization: Special facing types (RTJ, T&G, M&F), custom bolt drilling, and non-standard sizes available.

Third-Party Inspection: ABS, BV, DNV, LR, SGS, TUV available on customer request.

Global Delivery: Exported to pipeline projects across North America, Europe, Middle East, Asia, and Australia.

Tel / WhatsApp:
Victor: +86 15575100681
Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on A694 high-yield flanges. We offer certified quality, NACE MR0175 compliance, impact testing at -46°C, fast production lead times, and reliable global delivery to keep your pipeline projects running smoothly.

Stock Examples (Class 600 WN RF – A694 F60, Normalized):

Stock Examples (Class 900 WN RTJ – A694 F65, Normalized – High-Pressure Gas Transmission):

Stock Examples (Class 1500 WN RTJ – A694 F65 – High-Pressure Gas Pipeline):

Stock Examples for Subsea/Pipeline End Termination (A694 F65, Class 900 RTJ):

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