ASTM A105 WELD NECK FLANGES WNRF WNRTJ ASME B16.5 SOUR SERVICE
ASTM A105 weld neck flanges are widely used in oil and gas piping systems requiring high strength and reliable performance. Manufactured in accordance with ASME B16.5, these flanges are available in WNRF (Weld Neck Raised Face) and WNRTJ (Weld Neck Ring Type Joint) designs and are specifically suitable for sour service applications.
For sour service, ASTM A105 weld neck flanges are produced with controlled chemical composition and mechanical properties to comply with NACE MR0175 / ISO 15156 requirements. Strict hardness control and heat treatment ensure resistance to sulfide stress cracking (SSC) in H₂S-containing environments.
We are the professional manufacturer and exporter of ASTM A105 WNRF Flange WNRTJ ASME B16.5 in China.
As a leading manufacturer and exporter of ASTM A105 Carbon Steel Weld Neck Flanges, We supply forged flanges for high-pressure, high-temperature, and general industrial applications.
ASTM A105 is a carbon steel forging grade used primarily for piping components, valves, and flanges in oil & gas, petrochemical, power generation, and shipbuilding industries. Weld Neck Flanges are designed for butt-weld connection, ensuring strong structural integrity and excellent stress distribution in critical systems.
ASTM A105 Flange is produced from the A105 round bar through forging and machining process.
WNRF Flange (Weld Neck Raised Face Flange)
A WNRF Flange, or Weld Neck Raised Face Flange, is a type of flange commonly used in high-pressure and high-temperature piping systems. It is designed to provide a strong, leak-proof connection between two pipes, or between a pipe and a pressure vessel, by welding the flange to the pipe.
Raised Face (RF):
- The sealing surface has a raised area above the bolting circle, which improves gasket seating.
Ring Joint (RTJ or RJ)
- RTJ flanges feature a groove on their face into which a metallic ring gasket is seated.
- The ring gasket is compressed into the groove when the flange is bolted, forming a metal-to-metal seal.
Material Specification
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Standard: ASTM A105 / ASME SA105
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Type: Forged Carbon Steel Flanges
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Design: Weld Neck Flange (WNRF)
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Manufacturing Standard: ASME B16.5 / ASME B16.47 / MSS-SP-44
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Pressure Class: Class 150 – Class 2500
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Facing Type: RF (Raised Face), RTJ (Ring Type Joint), FF (Flat Face)
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Size Range: ½” NB – 60″ NB
Standards
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Material Standard: ASTM A105
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Dimensional Standard: ASME B16.5
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Pressure Rating: Class 150, 300, 400, 600, 900, 1500, 2500
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Facing Types: WNRF, WNRTJ
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Sour Service Standard: NACE MR0175 / ISO 15156
ASTM A105 Chemical Composition (% by weight)
| Element | Min | Max |
|---|---|---|
| C | — | 0.35 |
| Mn | 0.60 | 1.05 |
| Si | 0.10 | 0.35 |
| P | — | 0.035 |
| S | — | 0.040 |
| Cu | — | 0.40 |
| Ni | — | 0.40 |
| Cr | — | 0.30 |
| Mo | — | 0.12 |
ASTM A105 Mechanical Properties
| Property | Requirement |
|---|---|
| Tensile Strength | ≥ 485 MPa (70 ksi) |
| Yield Strength (0.2%) | ≥ 250 MPa (36 ksi) |
| Elongation | ≥ 22% |
| Reduction of Area | ≥ 30% |
| Hardness | ≤ 187 HB / 90 HRB |
ASTM A105 Heat Treatment
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Normalizing: 890 – 960 °C
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Tempering or Stress Relieving: As required for enhanced toughness
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Applied when flanges are intended for service above 425 °C or per ASME B31.3 requirements
ASTM A105 Flanges Testing & Inspection
All flanges conform to ASTM A105 / ASME SA105 standards, with full quality assurance:
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Visual and Dimensional Inspection
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Chemical Analysis
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Mechanical Testing (Tensile, Hardness, Impact)
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Ultrasonic and Magnetic Particle Examination
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Third-Party Inspection available (TÜV, BV, SGS)
Nominal Sizes (Inches)
| NPS (Nominal Pipe Size) | DN | Typical Bore (in.) | Outside Diameter (OD, mm) |
|---|---|---|---|
| ½” | 15 | 15.8 | 89 |
| ¾” | 20 | 21.3 | 98 |
| 1″ | 25 | 26.7 | 108 |
| 1½” | 40 | 48.3 | 127 |
| 2″ | 50 | 60.3 | 152 |
| 3″ | 80 | 88.9 | 190 |
| 4″ | 100 | 114.3 | 229 |
| 6″ | 150 | 168.3 | 279 |
| 8″ | 200 | 219.1 | 343 |
| 10″ | 250 | 273.0 | 406 |
| 12″ | 300 | 323.8 | 483 |
| 16″ | 400 | 406.4 | 597 |
| 20″ | 500 | 508.0 | 718 |
| 24″ | 600 | 610.0 | 813 |
ASTM-A105-Raw-Material-Certificates
Testing & Inspection
All ASTM A105 weld neck flanges for sour service are fully tested and inspected, including:
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Chemical composition analysis
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Mechanical testing
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Hardness testing (to meet NACE requirements)
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Dimensional inspection
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Non-destructive testing (UT, MT, PT as required)
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PMI testing upon request
Mill Test Certificates are provided in accordance with EN 10204 3.1, ensuring full traceability.
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