What are the machining and fabrication processes for stainless steel non-standard flanges
2026-01-12
When standard flanges fall short for a unique piping system, a custom solution is required. Stainless Steel Non-standard Flanges are engineered to meet precise specifications for complex applications. At Longan, we specialize in transforming raw material into high-performance, precision-engineered components. This blog outlines the key machining and fabrication processes that define the quality and reliability of our custom flanges.
Creating a Stainless Steel Non-standard Flange is a multi-stage process that requires expert knowledge and advanced equipment. Here is a breakdown of the core steps:
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Design & Engineering: Every project begins with detailed technical drawings, ensuring all dimensions, pressure ratings, and tolerances meet the client's exact requirements.
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Material Selection: Choosing the correct stainless steel grade (e.g., 304, 316, 316L) is critical for corrosion resistance and mechanical strength.
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Cutting & Shaping: Raw material is cut to size using plasma, laser, or waterjet cutting for accuracy.
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Forging or Plate Preparation: For superior strength, the blank may be forged. Alternatively, high-quality plate material is prepared for machining.
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CNC Machining: This is the most critical phase. Computer Numerical Control (CNC) lathes and milling machines precisely craft the flange's face, bore, bolt holes, and hub.
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Drilling & Tapping: Bolt holes are drilled and tapped with precision to ensure perfect alignment during assembly.
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Surface Finishing: Processes like polishing, passivation, or coating are applied to enhance corrosion resistance and meet sanitary or aesthetic standards.
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Quality Inspection: Each flange undergoes rigorous testing, including dimensional checks and Non-Destructive Testing (NDT), before final approval.
The following table summarizes the advantages of key processes we employ at Longan:
| Process | Primary Benefit | Typical Application |
|---|---|---|
| CNC Machining | Unmatched dimensional accuracy and complex geometry | High-pressure, critical-tolerance flanges |
| Forging | Superior grain structure and increased strength | Flanges for extreme temperature or pressure |
| Passivation | Enhanced corrosion resistance by restoring the protective oxide layer | Flanges for chemical or marine environments |
Stainless Steel Non-standard Flange FAQ
What are the lead times for manufacturing a custom Stainless Steel Non-standard Flange?
Lead times vary based on complexity, size, and quantity. A simple design may take 2-3 weeks, while intricate, large-diameter flanges with special testing can require 6-8 weeks or more. At Longan, we provide detailed project timelines after reviewing your specifications.
How does Longan ensure the quality of its Stainless Steel Non-standard Flanges?
We implement a strict Quality Control (QC) protocol from material certification to final shipment. Every Stainless Steel Non-standard Flange undergoes dimensional verification, surface inspection, and applicable NDT methods like Liquid Penetrant Testing (LPT) or Ultrasonic Testing (UT) to ensure integrity and performance.
Can you produce flanges according to international standards even if they are non-standard?
Absolutely. While the dimensions are custom, our fabrication processes adhere to the material, welding, and testing requirements of recognized standards such as ASME, ASTM, and DIN. This ensures your custom flange performs reliably within regulated industrial systems.
The journey from a raw stainless steel plate to a precision Stainless Steel Non-standard Flange demands expertise at every step. Longan combines decades of metallurgical knowledge with state-of-the-art CNC machining to deliver flanges that meet your most demanding specifications. For a reliable partner who prioritizes quality and precision in every custom component, contact us today with your project details for a comprehensive consultation and quote.
