Haihao Group’s Premium ASME B16.5 A105N RF Weld Neck Flanges

At Haihao Group, we take pride in delivering industrial flanges that meet the highest global standards. Our ASME B16.5 A105N RF weld neck flanges exemplify this commitment, offering unmatched reliability for critical applications in oil, gas, petrochemical, and power generation sectors. Designed to exceed expectations, these flanges combine stringent material specifications, advanced manufacturing, and rigorous quality control to ensure optimal performance.

Key Specifications for ASME B16.5 A105N RF Flanges

Our client-specific orders included the following configurations:

• 3/4″-300 (RF/5.56): A compact yet robust option for medium-pressure systems.
• 8″-150RF (D219.1×6.35): A larger diameter flange engineered for high-strength connections.

Every flange is crafted to ASME B16.5 dimensions, ensuring seamless integration with pipelines and equipment. The raised face (RF) design guarantees leak-free sealing, while the weld neck configuration provides superior stress distribution.

Material Excellence: A105N Steel Grade

The A105N carbon steel grade forms the backbone of these flanges, offering a balance of strength, weldability, and corrosion resistance. Below are the verified chemical and physical properties aligned with international standards:

Chemical requirement：

Grade	Content(wt%)					CEV %,max	Pcm %,max
steel	C	Si	Mn	P	S
A105N	≤0.25	0.10-0.35	0.60-1.05	≤0.015	≤0.020	0.36	0.19

Note(Customer Requirements):

• 1)When C≤0.12%, the carbon equivalent CE: Pcm=C+Si/30+Mn/20+Cu/20+Ni/60+Cr/20+Mo/15+V/10+5B
• 2) Ni ≤0.40% 
• 3) Cr≤ 0.30% 
• 4) Mo≤0.12% 
• 5) Cu ≤0.40% 
• 6) V ≤0.08%
• 7) The sum of Cr and Mo does not exceed 0.32%
• The total sum of Cu,Cr,Ni,Mo and V does not exceed 1.00%

Tensile properties at room temperature:

Test Parameter	Minimum Requirement
Yield Strength	≥ 250 MPa
Tensile Strength	485–655 MPa
Elongation	≥ 22%
Reduction of Area	≥ 30%

These properties ensure the flanges withstand extreme temperatures, pressures, and corrosive environments.

Uncompromising Quality Assurance

Haihao Group leaves no room for compromise. For every shipment, we provide:

1. Material Test Certificates (MTC): Documenting chemical and mechanical compliance.
2. Heat Treatment Reports: Certifying normalized or quenched/tempered processes for enhanced durability.
3. EN10204 3.1 Certification: Third-party inspection approval for full traceability.
4. Test Coupons: Two specimens (120×60×40 mm and 130×30×30 mm) retained for future reference.

Why Choose Haihao Group?

• Global Compliance: Certified to ASME, EN, DIN, and ISO standards.
• Customization: Tailored solutions for pressure ratings, dimensions, and finishes.
• Experience: Decades of expertise serving Fortune 500 companies and EPC contractors.
• Transparency: Real-time production updates and post-sale support.

Haihao Group’s ASME B16.5 A105N RF weld neck flanges are more than industrial components—they are a promise of safety, efficiency, and longevity. By prioritizing precision engineering and rigorous testing, we empower clients to achieve seamless operations in the world’s most demanding environments.

Contact Us Today to discuss your flange requirements and experience the Haihao advantage. Email:sales@haihaogroup.com