ASME B16.5 ASTM A105 weld neck flange overlay INCONEL UNS N06625

As a comprehensive industrial service provider integrating industry and trade, Haihao Group is dedicated to offering surfacing overlay flange solutions for the petrochemical and Marine engineering sectors. Recently, the composite surfacing overlay flange we delivered for a certain refining and chemical project in Singapore has received praise from the customer. The ASME B16.5 standard weld neck flange body is forged from ASTM A105 carbon steel. Inconel UNS N06625 nickel-based alloy surfacing welding is carried out in the key pressure-bearing areas (inner diameter and sealing surface). The wall thickness of the 10″ specification flange is precisely controlled at 8.56mm, and the design pressure is CL150. It is particularly suitable for high-temperature corrosive working conditions.

For this type of high-end composite flange, we have established a full-process quality control system:

Material traceability system: Provide three-level material certification documents

Base material: Original factory quality guarantee certificate of ASTM A105 + spectral retest report

Welding materials: Chemical composition Analysis Report of INCONEL 625 welding wire

Surfacing layer: Metallographic structure test report (including dilution rate verification)
Process control

Surfacing overlay process: GTAW automatic welding + multi-layer and multi-pass welding technology is adopted, and the thickness of the transition layer is strictly controlled within 1.5-2.0mm

Non-destructive testing: 100% penetrant testing (PT) + ultrasonic phased array testing (PAUT), in accordance with ASME acceptance standards

Dimensional verification: The flatness of the sealing surface detected by the three-dimensional coordinate measuring instrument is ≤0.05mm, and the deviation of the bolt hole span is ≤±0.3mm
Finished product performance verification

Hardness test: HV of the surfacing overlay layer ≥220, HV of the heat-affected zone ≤200

Thickness inspection: The minimum thickness of the surfacing overlay layer is ≥3.0mm

Intergranular corrosion: Tested in accordance with ASTM A262 E method, there was no sensitization phenomenon
The complete quality package delivered with the goods includes:

Material certification documents (each for base material, welding material and surfacing layer)

• Non-destructive testing report (including defect location map)
• Dimensional inspection records (including CMM measurement data)
• Surfacing Welding Procedure Qualification Report (PQR)
• Heat treatment curve graph
• A copy of the certification from the third-party inspection agency (SGS/BV)

This type of ASME B16.5 ASTM A105+INCONEL 625 composite flange is particularly suitable for:

• High-temperature oil and gas pipelines of catalytic cracking units in oil refineries
• Erosion resistance parts of water injection pipelines on offshore platforms
• Strong corrosive medium conveying system in chemical plants

Haihao Group offers a one-stop solution from material selection, manufacturing to testing to ensure that customers obtain highly reliable and long-life surfacing overlay flange products. If you need customized services, please feel free to contact us at any time! Email:sales@haihaogroup.com