Stainless Steel Coil Tube — First-Tier Domestic Supply (Model 201)

1. Product Overview

This stainless steel coil tube (盘管, Coiltube) is a precision-engineered, continuously formed tubular product supplied under the premium first-tier domestic procurement tier (第一梯队, First Tier — Domestic Leader). The product is sourced from Baofeng Clean Materials (宝丰洁净), a recognized national-level manufacturer that holds industry-leading positions in production capacity, output value, and international quality certifications. As a first-tier supplier, Baofeng Clean represents the apex of the domestic stainless steel coil tube supply chain, ensuring end-to-end traceability, consistent metallurgical quality, and reliable logistics for high-demand industrial applications.

2. Material & Properties

The coil tube is manufactured from high-purity austenitic stainless steel, conforming to international and domestic material standards. Key metallurgical properties include:

3. Specifications

Parameter Specification Standard Reference
Product Form Coiled Tubing (盘管 / Coiltube) GB/T 12771, ASTM A269
Outer Diameter (OD) 6.0 mm – 108 mm (customizable) GB/T 12771
Wall Thickness 0.5 mm – 6.0 mm ASTM A269
Coil Length Continuous coil, 50 m – 500 m per coil (standard) Internal specification
Coil Weight Up to 5,000 kg per coil —
Material Grade SUS304 / SUS316 / SUS321 / Custom Alloys GB/T 20878, JIS G4305
Tolerance — OD ±0.05 mm (precision grade) / ±0.10 mm (standard grade) GB/T 12771
Tolerance — Wall Thickness ±10% of nominal thickness ASTM A269
Surface Condition 2B / BA / No. 4 Hairline / No. 8 Mirror ASTM A480
End Preparation Plain end / Beveled end / Threaded (per customer request) ISO 15493
Heat Treatment Solution Annealed + Pickled GB/T 12771
Packaging Wooden reel with moisture-proof wrapping; export-grade palletizing available ISO 4180

4. Manufacturing Process

The coil tube production at Baofeng Clean follows a vertically integrated, closed-loop manufacturing process designed to ensure metallurgical consistency and dimensional accuracy:

  1. Slab Casting & Hot Rolling: Ultra-pure molten steel is cast into slabs via continuous casting (CC) with in-situ cleanliness control (inclusion size ≤ 15 μm). Slabs are hot-rolled into strip stock with controlled deformation ratios.
  2. Cold Rolling & Annealing: Strip is cold-rolled to target thickness with precision roller gap control. Intermediate and final annealing cycles are conducted in protective atmosphere furnaces (dew point ≤ −60 °C) to achieve full recrystallization without decarburization or scale formation.
  3. Precision Forming (Tube Mill): Annealed strip is fed through a multi-roll forming station with synchronized roll reduction, producing seamless tubular geometry. The forming process maintains wall-thickness uniformity within ±10%.
  4. Welding (if applicable): For welded coil tube, a high-frequency induction welding (HFW) or TIG welding process is employed, followed by inline weld inspection via ultrasonic testing (UT) and eddy current detection (ECT).
  5. Final Annealing & Pickling: Tubes undergo final solution annealing (1050–1100 °C) in a bellows-type annealing furnace, followed by acid pickling (HNO₃/HF blend) to remove oxide scale and restore passive chromium oxide film.
  6. Surface Finishing: Mechanical polishing, electrolytic polishing, or passivation treatment is applied per customer specification to achieve target surface roughness (Ra ≤ 0.4 μm for mirror finish).
  7. Coiling & Packaging: Finished tubes are coiled onto precision reels with controlled tension, wrapped in moisture-barrier film, and secured for transport.

5. Applications

First-tier coil tube products are deployed across demanding industrial sectors where material purity, corrosion resistance, and supply reliability are critical:

6. Quality Certifications

Baofeng Clean (宝丰洁净) maintains an extensive portfolio of international and domestic quality certifications that validate its position as a first-tier domestic supplier:

7. Unique Selling Points

Industry-Leading Production Capacity: Baofeng Clean operates among the largest integrated stainless steel tube production facilities in China, with annual output exceeding industry benchmarks, ensuring supply continuity for large-scale, long-term procurement contracts.

Ultra-Clean Metallurgy: The "Clean" (洁净) designation reflects proprietary steelmaking and refining processes that achieve ultra-low inclusion content and homogeneous microstructure, delivering superior surface integrity and mechanical performance.

Full-Chain Traceability: Every coil tube batch is traceable from raw material heat number through all manufacturing stages, supported by digital quality records and third-party laboratory verification.

First-Tier Supply Chain Position: As a recognized domestic leader (国产龙头), Baofeng Clean offers competitive pricing relative to imported equivalents while maintaining international certification parity, making it an optimal choice for cost-conscious yet quality-demanding procurement strategies.

Customization Capability: Flexible specification ranges for OD, wall thickness, grade, surface finish, and coil length enable tailored solutions for specialized engineering applications.

8. Supply Chain Classification

This product is categorized under the First Tier (第一梯队) of the domestic supplier hierarchy within the commercial procurement and supply chain management framework. First-tier suppliers are defined by their demonstrated leadership in production scale, revenue output, and certification breadth — collectively establishing them as preferred partners for mission-critical stainless steel coil tube procurement.