Stainless Steel Coil Tube — In-Stock Ready Delivery (304/316L)
Product Overview
The Stainless Steel Coil Tube (also referred to as Coiltube) supplied by Wenzhou Jixing Metal Materials Co., Ltd represents a critical supply-chain solution engineered for rapid deployment in industrial environments. Unlike custom-fabricated seamless or welded tubes that require extended lead times of 4–8 weeks, this product line maintains a strategic ready-stock inventory of the most commonly specified grades and dimensions, enabling dispatch within 1 to 3 calendar days from order confirmation.
This inventory-first approach addresses one of the most persistent pain points in procurement management: the conflict between production continuity and supply-chain latency. By pre-positioning high-demand specifications in warehouse stock, Wenzhou Jixing Metal Materials Co., Ltd eliminates the bottleneck of raw material sourcing and processing delays, making it an indispensable partner for organizations operating under just-in-time (JIT) manufacturing paradigms or managing unplanned maintenance scenarios.
Material Grades & Properties
The in-stock program covers the two most widely specified austenitic stainless steel grades in industrial piping and tubing applications:
ASTM A213 TP304 / UNS S30400
- Composition: Chromium (Cr) 18–20%, Nickel (Ni) 8–10.5%, Carbon (C) ≤ 0.08%
- Tensile Strength: ≥ 515 MPa
- Yield Strength (0.2% offset): ≥ 205 MPa
- Elongation: ≥ 40% (minimum, at gauge length 50 mm)
- Corrosion Resistance: Excellent resistance to atmospheric corrosion, dilute acids, and organic acids; moderate resistance to chloride-induced pitting
- Weldability: Excellent; no preheating required
- Maximum Service Temperature: 870°C (1600°F) in continuous oxidizing atmospheres
ASTM A213 TP316L / UNS S31603
- Composition: Chromium (Cr) 16–18%, Nickel (Ni) 10–14%, Molybdenum (Mo) 2–3%, Carbon (C) ≤ 0.03%
- Tensile Strength: ≥ 485 MPa
- Yield Strength (0.2% offset): ≥ 170 MPa
- Elongation: ≥ 40% (minimum, at gauge length 50 mm)
- Corrosion Resistance: Superior resistance to pitting and crevice corrosion due to molybdenum addition; low-carbon (L) designation minimizes intergranular corrosion risk after welding
- Weldability: Excellent; recommended for applications involving extensive welding or post-weld heat treatment
- Maximum Service Temperature: 870°C (1600°F)
Standard Specifications & Dimensions
The following table summarizes the commonly stocked dimensions and applicable standards for the in-stock coil tube program:
| Parameter | Specification Range | Applicable Standard |
|---|---|---|
| Outer Diameter (OD) | 6.0 mm – 168.3 mm (1/4" – 6") | ASTM A213, ASTM A554, EN 10217 |
| Wall Thickness | 0.5 mm – 12.0 mm | ASTM A213, GB/T 14976 |
| Coil Length per Spool | 30 m – 120 m (typical) | Manufacturer's Specification |
| Coil Inner Diameter (ID) | 150 mm – 300 mm | Manufacturer's Specification |
| Tolerance (OD) | ±0.10 mm (precision) / ±0.15 mm (standard) | ASTM A213 |
| Tolerance (Wall Thickness) | ±10% (standard) / ±5% (precision) | ASTM A213 |
| Surface Finish | Pickled & Polished (2B), Bright Annealed (BA), or Mill Finish | ASTM A240 (surface) |
| End Condition | Plain cut, deburred, or beveled (on request) | — |
| Delivery Condition | Annealed & Pickled (A&P) | ASTM A213 |
Manufacturing Process
The coil tubes in the in-stock program are produced through a tightly controlled manufacturing sequence that ensures dimensional accuracy, metallurgical homogeneity, and surface integrity:
- Slab Casting: High-purity molten stainless steel is cast into slabs via continuous casting, with strict control of chemical composition and inclusions.
- Hot Rolling & Annealing: Slabs are hot-rolled into coil stock and solution-annealed at 1050–1150°C to achieve uniform austenitic microstructure.
- Tube Piercing & Forming: Hot-rolled coil is pierced and drawn through calibrated dies to form seamless tube blanks with precise OD and wall dimensions.
- Cold Drawing & Sizing: Tubes undergo cold drawing through precision dies to achieve final dimensional tolerances (±0.10 mm OD, ±5% wall thickness for precision grades).
- Solution Heat Treatment: Final annealing at 1040–1120°C followed by controlled water quenching to restore full austenitic phase stability and maximize corrosion resistance.
- Pickling & Passivation: Acid pickling removes surface scale; subsequent passivation forms a chromium-oxide protective film (minimum 100 Å thickness).
- Coiling & Packaging: Tubes are coiled onto standardized spools with protective end caps, wrapped in moisture-barrier film, and palletized for logistics readiness.
Applications
The combination of ready-stock availability and certified material properties makes this coil tube program suitable for the following critical applications:
- Emergency Maintenance & Repair: Rapid replacement of failed piping in chemical processing plants, power generation facilities, and marine systems where production downtime costs exceed the premium of expedited supply.
- Prototyping & Sample Fabrication: R&D laboratories and engineering teams requiring small quantities of certified tubing for pilot testing, flow simulation, or corrosion coupon studies.
- Pharmaceutical & Bioprocessing Piping: 316L grade coil tube for sanitary piping systems (hygienic-grade surface finish available) in GMP-regulated environments.
- Food & Beverage Processing: 304 and 316L tubing for CIP (Clean-in-Place) compatible process lines in dairy, brewing, and beverage manufacturing.
- Heat Exchanger & Boiler Tube Manufacturing: Feedstock for secondary manufacturers producing U-tube bundles, shell-and-tube exchangers, and fire-tube boilers.
- Automotive & Aerospace Sub-Assemblies: Precision-drawn tubing for fuel lines, hydraulic circuits, and structural components where rapid prototyping is essential.
- Oil & Gas Downhole Equipment: 316L coil tube for chemical injection lines, scrubber piping, and corrosion-resistant cladding applications.
Quality Certifications & Traceability
Every spool of in-stock coil tube is accompanied by a full quality documentation package ensuring complete traceability from mill heat number to end delivery:
- Mill Test Certificates (MTC): EN 10204 Type 3.1 certificates issued per heat number, documenting chemical analysis (spectrometric) and mechanical test results (tensile, hardness, impact).
- Material Traceability: Heat number laser-marked on coil end cap and cross-referenced in the digital inventory management system for recall or audit purposes.
- Non-Destructive Testing (NDT): Eddy current testing per ASTM A776 for all coil tube spools; ultrasonic testing available upon request for wall thickness verification.
- Pressure Testing: Hydrostatic or pneumatic testing per ASTM A530 / EN 10217-2 for applications requiring pressure integrity verification.
- Compliance Standards: ISO 9001:2015 (Quality Management System), PED 2014/68/EU (Pressure Equipment Directive) where applicable, and NACE MR0175/ISO 15156 (sour service) for 316L grade.
- Third-Party Inspection: Optional SGS, BV, or TUV inspection and witness testing available at no additional cost for qualifying orders.
Unique Selling Points
"From Stock to Site in 72 Hours — Certified Quality Without Compromise"
- Unmatched Lead Time: 1–3 day dispatch for standard 304/316L specifications — a fraction of the 4–8 week lead time for custom-ordered tubing. This translates to a 90% reduction in supply-chain latency for common dimensions.
- Zero-Minimum-Order Flexibility: Partial coil breaks and single-spool orders accommodated, supporting both large-scale procurement and small-quantity emergency needs.
- Full Documentation Readiness: MTCs, material passports, and compliance declarations pre-generated and digitally accessible — eliminating the 5–10 day delay typically associated with post-delivery certificate issuance.
- Strategic Inventory Depth: Maintained stock levels cover the top 80% of historical order volumes by specification, ensuring high probability of immediate availability for the most commonly specified dimensions.
- End-to-End Supply Chain Control: Direct mill-sourcing relationships with certified stainless steel producers ensure consistent material quality and eliminate the variability introduced by secondary distributors.
- Technical Support Integration: Engineering consultation available at point of order to validate specification suitability, recommend optimal grade selection, and assist with fabrication planning.
Ordering & Logistics
To maximize the benefits of the in-stock program, customers are advised to:
- Submit specifications (grade, OD, wall thickness, surface finish, quantity) via the online procurement portal or dedicated account manager.
- Receive a confirmed availability notification within 2 hours of order submission.
- Approve and confirm within the same business day to secure same-week dispatch.
- Receive delivery via standard freight (3–7 days domestic) or expedited courier (1–2 days) depending on urgency and destination.
For orders exceeding standard stock parameters or requiring non-standard surface finishes, custom fabrication timelines of 15–25 business days apply, with priority processing available for qualified accounts.