Heat Exchanger Steel Pipe Fittings

We manufacture our heat exchange steel pipe fittings to meet exact dimensional, material, and mechanical requirements. Please review the detailed specifications below to find the parameters that match your project.

Dimensional Specification Table (Butt-Weld Fittings per ASME B16.9)

Our heat exchange steel pipe fittings are manufactured and tested in strict compliance with major international standards for dimensions, materials, and testing protocols. The tables below summarize the key applicable standards.

Primary Standards for Heat Exchange Steel Pipe Fittings

Dimensional Tolerances per ASME B16.9 (Selected Examples)

Manufacturing Process of Heat Exchange Steel Pipe Fittings

To ensure precise dimensional accuracy, mechanical strength, and corrosion resistance, our heat exchange pipe fittings are produced through a tightly controlled manufacturing process. Every step is monitored to meet ASME B16.9 and international material standards.

Step 1: Raw Material Selection & Cutting

We begin with certified steel pipes, plates, or forgings in carbon steel, stainless steel, duplex steel, or nickel alloys. The raw materials are cut to exact lengths using CNC plasma cutting or band saws, ensuring minimal waste and accurate sizing for the subsequent forming process.

Step 2: Hot Forming or Cold Forming

Depending on the fitting type and material:

Elbows and Return Bends: Heated using induction heating (for hot forming) or formed via cold mandrel bending to achieve exact radii.

Tees and Reducers: Formed using hydraulic cold-forming or hot-pressing techniques to ensure uniform wall thickness at the junction points.

Step 3: Heat Treatment (Solution Annealing / Normalizing)

To relieve internal stresses caused by forming, the fittings undergo heat treatment. Stainless steel and nickel alloys are solution-annealed, while carbon and alloy steels are normalized. This step restores the material's microstructure and ensures optimal mechanical properties.

Step 4: Precision Machining & End Preparation

The fitting ends are machined to match the required bevel angle (for welding). All dimensions—including OD, center-to-end length, and wall thickness—are precisely machined to meet ASME B16.9 tolerances (e.g., ±1.6 mm OD, ±2 mm end-to-end).

Step 5: Surface Treatment

For applications requiring high hygiene or fouling resistance (e.g., pharmaceutical or food-grade), the internal surfaces are polished or electropolished. Other surface finishes include pickling and passivation for stainless steel, or anti-rust oiling for carbon steel.

Step 6: Non-Destructive Testing (NDT)

To guarantee the integrity of the fittings, we conduct strict NDT:

PMI (Positive Material Identification): To verify the chemical composition of the alloy.

UT (Ultrasonic Testing) / RT (Radiographic Testing): To detect internal defects in welds and materials.

Hydrostatic Testing: To ensure pressure containment and leak-free performance.

Step 7: Marking & Packing

Each fitting is clearly marked with the material grade, size, wall thickness (Schedule), and heat number for full traceability. Fittings are then wrapped in waterproof paper, bundled securely with steel strips, and tagged (two tags per bundle) for safe FCL ocean freight.

1. What standards do your heat exchange pipe fittings comply with?
Our butt-weld fittings are manufactured in strict accordance with ASME B16.9 for dimensional requirements. We also comply with international material standards (such as ASTM) and testing protocols. Every fitting is designed to maintain precise tolerances for leak-free assembly in high-pressure systems.

2. What materials can you supply for heat exchange fittings?
We offer a comprehensive range of materials to withstand various corrosive and high-temperature environments, including:

Carbon Steel & Alloy Steel

Stainless Steel (304, 316L)

Duplex Steel

Nickel Alloys (Inconel, Monel)
We can also provide electropolished interiors for sanitary applications.

3. Can you manufacture custom fittings based on our drawings?
Yes. While we supply standard ASME B16.9 elbows, tees, and reducers, we also specialize in custom-machined components such as U-bends, return headers, and special radius bends. Please send us your technical drawings for a precise quotation.

4. How do you ensure the quality and material integrity of the fittings?
We conduct strict quality control and Non-Destructive Testing (NDT), including:

PMI (Positive Material Identification): To verify the chemical composition.

Hydrostatic Testing: To ensure pressure integrity.

Dimension Inspection: To verify OD, wall thickness, and center-to-end lengths.
Third-party inspection (SGS, BV, TÜV) is fully supported.

5. What is the typical lead time for a bulk order?
Delivery time is generally within 30 days, depending on your order quantity and the complexity of the fittings. For custom-machined parts, lead time may vary based on material availability.

6. What are your payment and packing terms?

Payment Terms: T/T, L/C, O/A, D/P.

Packing: Each bundle is wrapped in waterproof paper, secured with steel strips, and tagged with two labels per bundle. The packaging is optimized for FCL ocean freight to prevent damage and moisture.