Haihao Group Ships ASME B16.5 A105N Carbon Steel Flanges to Singapore Client
Haihao Group recently completed the manufacturing and shipment of a full range of ASME B16.5 A105N carbon steel flanges for a customer based in Singapore. The shipment included a variety of flange types—slip on (SO RF), weld neck (WN RF), and blind (BL RF)—covering pressure ratings of 150# and 300#, with wall thicknesses ranging from standard to S40 and S80.
These components are destined for a high-integrity piping application, where consistency, material traceability, and dimensional accuracy are non-negotiable.
A Detailed Look at the Delivered Flanges
This order featured a diverse specification set, covering sizes from 1″ to 20″, and pressure classes tailored to the application requirements:
- Slip On Flanges (SO RF) – Sizes: 1″, 12″, 14″, 16″, 20″; Pressure Class: 150#
- Weld Neck Flanges (WN RF) – Sizes: 2.1/2″, 3″, 4″, 6″, 8″, 20″; Pressure Class: 150# / 300#
- Blind Flanges (BL RF) – Sizes: 2.1/2″, 8″, 10″, 12″; Pressure Class: 150# / 300#
Several items were produced to S40 and S80 thickness, ensuring compatibility with the client’s specified pipe schedules and mechanical requirements. Every flange was machined to raised face (RF) type, and each bore, hub height, and flange thickness was verified according to ASME B16.5 tolerances.
A105N Forging: Strength in Simplicity
All flanges were forged using ASTM A105N carbon steel—normalized heat-treated to improve grain structure and enhance mechanical toughness. This material is widely used for high-temperature and high-pressure service, and its weldability makes it an excellent choice for flanged pipe joints in oil, gas, and chemical sectors.
The normalized condition (A105N) is particularly preferred in overseas projects, where mechanical consistency and traceable thermal processing are required for inspection approval.
Quality Documentation and Inspection Integrity
For this project, Haihao Group provided full material certification (EN 10204 3.1) along with detailed dimensional and quality inspection records. The flanges were checked for:
- Dimensional accuracy (OD, ID, bolt circle, bore)
- Surface finish and flange facing
- Material grade stamping and pressure class marking
- Visual and surface defect detection
Each flange left our facility individually inspected, clearly labeled, and securely packed for export, ensuring traceability and protection during transit.
Built for Pressure, Backed by Experience
Some of the heavier-duty weld neck flanges in this batch—such as the 300# WNRF in 6″ and 8″ sizes with S80 thickness—were machined with precise bevels and hub dimensions to withstand pipeline vibration and cyclical stress. This makes them particularly suitable for long-term service in high-pressure steam lines, refinery manifolds, or offshore risers.
Why Haihao?
Delivering this batch to Singapore is part of Haihao Group’s continuing role as a trusted partner for industrial pipe fittings and flanges across Southeast Asia and beyond. With over 20 years of manufacturing experience, we combine:
- Full in-house forging and machining capability
- International material standards compliance
- Fast response to custom specs and drawings
- Transparent QC and shipping documentation
Whether it’s a complete piping package or just a few customized forged flanges, we work closely with our clients to ensure every detail matches project demands.
Let’s Work Together
Need a reliable supplier of ASME B16.5 A105N flanges for your next project in Southeast Asia or globally? Our team is ready to help.
sales@haihaopipe.com