ASTM A536 Flanges Manufacturer, Supplier and Exporter in India
Introduction
Flanges are vital components in piping systems, acting as the connectors that hold together pipes, valves, pumps, and equipment in a secure and leak-proof manner. Among the various materials used for flange manufacturing, ASTM A536 ductile iron flanges stand out for their combination of strength, durability, and flexibility. Unlike traditional cast iron flanges, ductile iron offers superior impact resistance and toughness, making it ideal for demanding industrial environments.
At Mcneil Instrument, we specialize in manufacturing, supplying, and exporting ASTM A536 flanges that meet stringent international standards. With years of expertise, our products are trusted across industries including water treatment, oil & gas, petrochemicals, and power generation.
What is ASTM A536 and Why is it Preferred?
The ASTM A536 standard specifies ductile iron castings designed to offer high tensile and yield strength without compromising ductility. This material contains nodular graphite inclusions, which give it enhanced flexibility compared to grey iron.
Key Benefits of ASTM A536 Flanges
- High Strength: With tensile strengths often exceeding 448 MPa, these flanges can handle high-pressure and heavy-load environments.
- Superior Impact Resistance: Unlike brittle cast iron, ductile iron resists cracking under impact or vibration.
- Corrosion Resistance: Suitable for use in waterworks, steam lines, and even certain chemical environments.
- Cost-Effective Alternative: Offers a strong balance between performance and affordability compared to stainless steel or exotic alloys.
Types of ASTM A536 Flanges
ASTM A536 flanges come in various configurations to meet diverse industrial needs:
- Weld Neck Flanges – Ideal for high-pressure pipelines due to their long tapered hub and strong welded connection.
- Slip-On Flanges – Easy to install and economical for low-to-moderate pressure applications.
- Blind Flanges – Used to seal the end of a pipeline or vessel.
- Socket Weld Flanges – Perfect for small-diameter, high-pressure systems.
- Lap Joint Flanges – Suitable for systems requiring frequent disassembly for inspection or maintenance.
- Threaded Flanges – Used in piping where welding is not practical.
Each flange type is designed with specific pressure ratings, dimensional tolerances, and end connections to ensure compatibility with standard piping systems.
Technical Specifications of ASTM A536 Flanges
The specifications determine the material’s composition, size range, and operational limits.
| Specification | Details |
| Standard | ASTM A536 / ASME SA536 |
| Material Grades | 65-45-12, 80-55-06, 100-70-03 |
| Size Range | ½” to 48” (DN 15 to DN 1200) |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Face Types | RF, FF, RTJ |
| Compliance Standards | ANSI, ASME, DIN, EN, JIS, BS |
Mechanical Properties of ASTM A536 Flanges
Mechanical properties define the performance of the flanges under different load and pressure conditions.
| Property | Value (Grade 65-45-12) |
| Tensile Strength | ≥ 448 MPa |
| Yield Strength | ≥ 310 MPa |
| Elongation | ≥ 12% |
| Hardness | 130–180 BHN |
| Impact Resistance | High (varies with grade) |
Certifications
Every ASTM A536 flange from Mcneil Instrument is tested and certified to meet global requirements.
- ASTM A536 material compliance
- ASME B16.5 / B16.47 dimensional standards
- EN 10204 3.1 / 3.2 Mill Test Certificates
- ISO 9001:2015 certified production process
- IBR (Indian Boiler Regulations) approval upon request
- NACE MR0175/MR0103 for sour service corrosion resistance
Available Sizes & Specifications
| Type | Size Range | Pressure Class |
| Weld Neck Flanges | ½” to 48” | 150# – 2500# |
| Blind Flanges | ½” to 48” | 150# – 2500# |
| Slip-On Flanges | ½” to 24” | 150# – 600# |
| Socket Weld Flanges | ½” to 4” | 150# – 900# |
| Threaded Flanges | ½” to 4” | 150# – 600# |
| Lap Joint Flanges | ½” to 24” | 150# – 600# |
Global Reach of Mcneil Instrument: ASTM A536 Flanges
Mcneil Instrument exports ASTM A536 ductile iron flanges worldwide, delivering performance-driven solutions for multiple sectors:
- In Saudi Arabia and Qatar, we supply ductile iron flanges to waterworks and oil & gas industries.
- In Nigeria and Ghana, our products are essential for municipal water distribution and treatment facilities.
- In Texas and Chicago, we export precision-engineered flanges for high-pressure municipal piping and industrial projects.
- In Malaysia and Singapore, our flanges are utilized in chemical plants and large-scale infrastructure projects.
- Across Brazil, we serve sectors like pulp & paper, sugar refineries, and heavy engineering industries.
Conclusion
ASTM A536 flanges provide the ideal balance of strength, toughness, and cost-effectiveness for industries requiring reliable ductile iron components. From waterworks to petrochemicals and power generation, they ensure safe and efficient pipeline operations.
As a leading manufacturer, supplier, and exporter of ASTM A536 flanges in India, Mcneil Instrument offers globally certified solutions that meet the highest standards of performance and durability.
