Last month, Datang hosted a professional procurement team from Kazakhstan. The visit focused on a rigorous inspection of our production lines and quality control protocols for a specialized order of High-Frequency Welded (HFW) Spiral Finned Tubes and matching heat exchanger components.
After a detailed two-day audit of our facility in Yanshan, the client was impressed by our technical precision and confirmed the order on-site.
Datang Designs Solution for Kazakhstani Client Utilizing High-Frequency Welded Finned Tubes
I. Rigorous 48-Hour Professional Inspection
Over two days, the Kazakhstan technical team conducted a “deep dive” into every critical phase of our manufacturing ecosystem. From the initial arrival of raw materials to the final shipment-ready products, no detail was overlooked.
-
Raw Material Traceability: The client performed a line-by-line verification of material certificates for the 159mm x 12mm base tubes and 08kpM4 fin tapes. Our strict adherence to GOST, ASTM, and GB standards provided the foundational confidence needed for high-pressure applications.
-
Precision Welding Observation: In the heart of the workshop, the delegation observed our High-Frequency Welding (HFW) equipment in action. They noted the stability of the welding parameters, the uniformity of the 7.69mm fin pitch, and the structural integrity of the full-penetration welds.
-
Advanced Quality Testing: We demonstrated our full suite of testing capabilities, including:
-
NDT (Non-Destructive Testing): Ensuring internal weld soundness.
-
Dimensional Precision: Verifying the strict 8850mm finned length and specific end-gap tolerances.
-
Hydrostatic Testing: Confirming pressure resistance for the matching 180° Short Radius Elbows.
-
GOST 550-75 159mm x 12mm Large-Diameter High-Frequency Welded (HFW) Spiral Finned Tubes
II. Beyond the Product: A System of Excellence
The inspection team’s praise extended beyond the steel itself. They highlighted the “Datang Standard” of production management:
-
Organized Environment: A clean, optimized workshop layout that ensures safety and efficiency.
-
Technical Expertise: Our engineers provided real-time data and transparent answers to complex technical inquiries.
-
Traceability: Every test data point was backed by a rigorous, traceable report, proving that quality at Datang is a calculated result, not a coincidence.
HFW finned tubes designed for heat exchangers. The selection of GOST
III. On-Site Success: From Inspection to Contract
The transparency of our process led to immediate results. During the post-inspection debrief, the Kazakhstan representative stated that the visit had “completely eliminated any concerns regarding quality or capacity.” By the end of the second day, a new contract was signed on-site, covering the full scope of:
-
HFW Finned Tubes (9000mm & 9800mm variants)
-
Matching 159mm x 12mm 180° Return Bends
Technical Specifications & Scope of Supply
The project involves high-pressure, heavy-duty HFW finned tubes designed for heat exchangers. The selection of GOST and ASTM equivalent materials reflects the client’s need for international standard compliance.
1. HFW Spiral Finned Tube Specifications
| Component | Specification A (9000mm) | Specification B (9800mm) |
| Base Tube OD x WT | 159mm x 12mm | 159mm x 12mm |
| Base Tube Length | 9000mm | 9800mm |
| Finned Length | 8850mm | 8850mm |
| Non-Finned Ends | 75mm / 75mm | 875mm / 75mm |
| Base Tube Grade | GOST 550-75 / B20 GOST 8732-78 / ASTM A106 Gr.B / GB/T 5310 20G | Same |
| Fin Material | CS 08kpM4 / 08AL / SPCC (GOST 503-81) | Same |
| Fin Dimensions | 2.0mm (Thickness) x 20mm (Height) | 2.0mm (Thickness) x 20mm (Height) |
| Fin Pitch | 7.69mm (13 fins/100mm) | 7.69mm (13 fins/100mm) |
2. Matching Components
- Item: Short Radius ELBOW
- Dimensions: 159mm x 12mm
-
Degree: 180° Return Bends
Why the Client Chose Datang
- Standard Compatibility: Our ability to supply materials matching Russian GOST standards (GOST 550-75, 8732-78, 503-81) alongside ASTM and GB standards was a critical factor for the Kazakhstan market.
- Precision Manufacturing: We demonstrated consistent welding penetration and fin-to-tube bonding strength for the heavy-wall (12mm) tubing required for this project.
- Complete Solution: Beyond the finned tubes, providing the matching 180-degree short radius elbows ensured a seamless assembly for the client’s heat exchanger fabrication.
-
On-Site Verification: The client personally verified our inspection procedures, including ultrasonic testing and dimensional accuracy checks, confirming our commitment to “Zero-Defect” delivery.
“Trust is our most important product.” The successful inspection and subsequent order from our Kazakhstan partners reinforce Datang’s position as a leading global supplier of HFW thermal solutions. We continue to bridge borders through technical excellence and reliable service.
Trust is our most important product. Thank you to every client who visits us!
