MI (Malleable Iron) Pipe Fittings are highly versatile, durable, and cost-effective components widely used in plumbing, industrial, and fire protection systems. Manufactured from white cast iron that has undergone a specialized heat-treatment (annealing) process, these fittings transform from a brittle state into a tough, ductile material with excellent impact resistance and vibration damping properties. Shanxi Xinshunda Flange Manufacturing Co., Ltd. produces premium Malleable Iron fittings in strict compliance with international standards such as ASTM A197 and ASME B16.3. Available in both Black and Hot-Dip Galvanized finishes, our fittings provide reliable, leak-proof connections for water, gas, air, and steam applications. Comprehensive mechanical testing and quality certifications are guaranteed with every shipment.
Production Details
Our ASTM A193 bolts are produced using state-of-the-art CNC machinery to ensure every thread and hexagonal head meets precise engineering drawings. The raw materials undergo strict chemical composition analysis before entering the production line. Each fastener is subjected to rigorous surface inspection to ensure the absence of defects such as cracks, laps, or improper coating. The dimensional accuracy is verified using advanced measuring instruments, ensuring a perfect match with your mating flanges.
Product Properties and Application
Product Properties
Superior Ductility & Toughness: The annealing process converts hard, brittle white iron into a malleable form, allowing the fittings to absorb stress, vibration, and impact without cracking.
High Pressure & Temperature Resistance: Class 150 fittings are rated for up to 300 PSI at ambient temperatures, while Class 300 fittings handle up to 2000 PSI, making them suitable for demanding industrial services.
Excellent Vibration Damping: Malleable iron's inherent molecular structure effectively dampens mechanical vibrations, preventing loosening at the joints in machinery-connected piping.
Optimal Corrosion Protection: Available in Black (for gas/oil) or Hot-Dip Galvanized finishes (with a zinc coating ≥500g/m²) to resist rust and corrosion in various environments.
Application
MI Pipe Fittings are extensively used in systems requiring strong, reliable, and vibration-resistant threaded connections. Key applications include Fire Protection Sprinkler Systems, Plumbing and Water Supply Lines (residential and commercial), and HVAC Systems (steam and hot water). They are also widely utilized in Compressed Air Piping, Gas and Fuel Distribution, and Industrial Machinery where frequent assembly and disassembly for maintenance are required.
|
Parameter |
Specification |
|
Standard |
ASME B16.3 (Fittings), ASME B16.14 (Plugs/Bushings), ASME B16.39 (Unions) |
|
Product Type |
Elbow (45°, 90°, Street), Tee, Cross, Coupling, Union, Cap, Plug, Bushing |
|
Material |
Malleable Iron (ASTM A197 Cupola Malleable Iron) |
|
Size Range |
1/8" to 6" (DN6 to DN150) |
|
Pressure Class |
Class 150 (Standard Duty), Class 300 (Heavy Duty) |
|
End Connection |
Female/Male Threaded Ends |
|
Thread Standard |
ASME B1.20.1 (NPT), ISO 7-1 (BSPT), ISO 228 (BSPP) |
|
Surface Finish |
Black Paint, Rust-Proof Oil, or Hot-Dip Galvanized (HDG) |
|
Packing |
Plywood Cases, Wooden Pallets, or Custom Export Packaging |
Physical Properties
|
Property |
Value (ASTM A197 Malleable Iron) |
|
Tensile Strength |
≥ 276 MPa (40,000 psi) |
|
Yield Strength |
≥ 205 MPa (30,000 psi) |
|
Elongation |
≥ 10% |
|
Hardness |
≤ 150 HB (Brinell) |
|
Impact Toughness |
High (Resistant to shock loads) |
QA & QC
At Shanxi Xinshunda, we implement a rigorous Quality Control system for our Malleable Iron fittings. Every fitting undergoes strict dimensional inspections using calibrated gauges to ensure compliance with ASME and other international standards. We perform 100% Air Pressure Underwater Testing to verify leak tightness. Surface defects and thread accuracy are thoroughly checked using specialized thread gauges. Material composition and mechanical properties are verified through certified laboratory tests, and Mill Test Certificates (EN 10204 3.1) are provided with every shipment.
Packing, Storage, Handling and Transportation
To protect the product during transit, each fitting is carefully cleaned and coated. Smaller fittings are individually wrapped in plastic bags or bubble wrap, while larger components are stacked and securely fixed on strong plywood pallets. For international shipping, products are packed in sturdy plywood cases with ample cushioning to prevent movement and surface scratches. Each package is clearly labeled with the size, material, pressure class, quantity, and batch number. Store in a dry, well-ventilated area to prevent prolonged exposure to moisture.
Strategic Partners with Shanxi Xinshunda
With over 15 years of manufacturing expertise, Shanxi Xinshunda Flange Manufacturing Co., Ltd. has proudly supplied premium industrial piping components to 3,800+ global customers across 70+ countries. We are committed to delivering robust and reliable solutions that ensure the safety and efficiency of your infrastructure projects worldwide, making us your trusted partner in the global energy and processing industries.
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