Haihao Group Supplies ASTM B366 UNS N06625 Threaded Pipe Caps to Singapore for Sour Service Applications

Haihao Group recently completed the production and shipment of a batch of ASTM B366 N06625 Cap products for a customer in Singapore. These high-performance threaded pipe caps were manufactured from nickel alloy UNS N06625 (Inconel® 625 equivalent) and designed for demanding sour service conditions where corrosion resistance and mechanical reliability are critical.

The supplied product specification was:

This order demonstrates Haihao Group’s capability to supply specialty alloy fittings for customers operating in challenging oil and gas environments.

ASME B16.11 ASTM B366 UNS N06625 threaded pipe cap

Why ASTM B366 UNS N06625 Is Selected for Sour Service

The ASTM B366 N06625 Cap supplied for this project was intended for use in a corrosive environment containing hydrogen sulfide (H₂S), where conventional carbon steel fittings may suffer from sulfide stress cracking and accelerated corrosion.

UNS N06625 is a nickel-chromium-molybdenum alloy known for:

Outstanding corrosion resistance

Excellent resistance to pitting and crevice corrosion

High mechanical strength

Superior performance in chloride-containing environments

Reliable service under elevated temperatures

Excellent resistance to sour gas exposure

These properties make the ASTM B366 N06625 Cap a preferred solution for offshore platforms, subsea systems, refineries, petrochemical plants, and gas processing facilities.

Manufactured to ASME B16.11 Standards

The threaded pipe cap was produced according to ASME B16.11 threaded cap requirements, ensuring dimensional accuracy and compatibility with high-pressure threaded piping systems.

Key specifications include:

• Size: 3/4″
• Pressure Class: 3000#
• End Connection: NPT Thread
• Material: UNS N06625
• Manufacturing Standard: ASME B16.11
• Material Standard: ASTM B366
• Service Requirement: NACE MR0175

Compliance with international standards helps ensure safe installation and long-term operational reliability.

Heat Treatment for Enhanced Performance

A key requirement of this project was heat treatment.

The supplied ASTM B366 N06625 Cap underwent controlled heat-treatment procedures to achieve the required metallurgical structure and mechanical properties. Proper heat treatment contributes to:

• Improved material stability
• Enhanced corrosion resistance
• Better stress-relief performance
• Increased reliability in demanding service conditions

This process is particularly important for fittings intended for critical oil and gas applications.

NACE MR0175 Compliance for Corrosive Environments

The customer specifically required fittings suitable for sour service operation.

The manufactured NACE MR0175 fitting complied with industry requirements for materials used in environments containing hydrogen sulfide. Material selection and manufacturing controls were carefully implemented to support resistance against sulfide stress cracking and related failure mechanisms.

For operators in the energy sector, NACE compliance remains a key factor when selecting pressure-containing components.

Quality Control Throughout Production

To ensure every ASTM B366 N06625 Cap met project specifications, Haihao Group implemented a comprehensive quality-control process.

Inspection activities included:

• Raw material verification
• PMI (Positive Material Identification)
• Dimensional inspection
• Thread inspection
• Visual examination
• Heat-treatment verification
• Marking and traceability checks
• Final packing inspection

Each stage was documented to provide complete product traceability and customer confidence.

Reliable Nickel Alloy Fittings for Global Projects

Haihao Group supplies a wide range of nickel alloy piping products for customers worldwide, including:

• Threaded pipe caps
• Couplings
• Unions
• Forged fittings
• Flanges
• Buttweld fittings
• Custom-machined components

Whether the application involves offshore oil production, petrochemical processing, LNG facilities, or corrosion-sensitive environments, our engineering team can provide material solutions tailored to project requirements.

Looking for ASTM B366 N06625 Pipe Fittings?

If your project requires ASTM B366 N06625 Cap products, ASME B16.11 threaded cap fittings, or other nickel alloy piping components for sour service applications, Haihao Group can provide manufacturing, inspection, and export support.

Contact our team today for technical assistance, pricing information, and customized solutions for your next project.