Stainless Steel Coil Tube — Packaging and Handling Specification

1. Product Overview

The Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered tubular product supplied in continuous coil form, designed for downstream processing including straightening, cutting, bending, and welding operations. This specification document addresses the critical aspects of Packaging and Handling (Packaging & Loading/Unloading Standards), which fall under the category of risk prevention and damage control during logistics and transportation. Proper packaging integrity is essential to ensure that the surface quality, dimensional accuracy, and structural integrity of the coil tube remain uncompromised from the point of dispatch to the point of receipt at the customer's facility.

2. Material and Properties

The coil tube is fabricated from high-grade austenitic and/or ferritic stainless steel grades, typically conforming to international standards such as ASTM A213/A269, EN 10216-5, or GB/T 12771. Key metallurgical characteristics include:

• Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and intergranular corrosion due to chromium (Cr ≥ 18%) and nickel (Ni ≥ 8%) content.
• Mechanical Properties: Tensile strength ranging from 515–750 MPa; yield strength ≥ 205 MPa; elongation ≥ 40% (varies by grade and heat treatment condition).
• Surface Finish: Available in No.1, 2B, BA (Bright Annealed), and mirror polish finishes. Surface roughness Ra ≤ 0.4 μm for polished variants.
• Formability: Excellent cold-forming characteristics enabling tight bend radii without cracking.

3. Specifications

Parameter	Specification	Standard Reference
Outer Diameter (OD)	6.0 mm – 219.0 mm	ASTM A269 / EN 10216-5
Wall Thickness	0.5 mm – 12.0 mm	GB/T 12771
Coil Length	Continuous coil, 5 m – 200 m (customizable)	Manufacturer specification
Steel Grades	304, 304L, 316, 316L, 321, 310S, 430, 904L	ASTM A240 / ASTM A213
Surface Condition	No.1 / 2B / BA / HL / Mirror (Ra ≤ 0.4 μm)	ASTM A480
Coil Core ID	250 mm / 300 mm / 500 mm (selectable)	ISO 4624
Tolerance — OD	±0.10 mm (precision) / ±0.50 mm (standard)	EN 10216-5
Tolerance — Wall Thickness	±10% of nominal	ASTM A269

4. Manufacturing Process

The production of stainless steel coil tubes follows a rigorous multi-stage manufacturing workflow:

1. Hot Rolling: Steel ingots or continuously cast slabs are hot-rolled into flat strip or pipe blank stock at temperatures above 1100°C.
2. Pickle and Scale Removal: Hot-rolled scale is removed via acid pickling (HNO₃ + HF blend) to reveal the base metal surface.
3. Cold Rolling: Strip is cold-rolled to precise thickness tolerances under controlled tension, enhancing surface finish and dimensional accuracy.
4. Forming (ERW / OAW / Seamless): Strip is formed into tubular geometry via Electric Resistance Welding (ERW), Orbital Arc Welding (OAW), or seamless piercing methods.
5. Weld Heat-Affected Zone (HAZ) Annealing: The weld seam is locally annealed to restore corrosion resistance and mechanical homogeneity.
6. Heat Treatment (Solution Annealing): Full coil annealing at 1050°C–1100°C followed by controlled quenching to achieve the desired microstructure.
7. Coiling: The finished tube is wound onto a precision coil former, with inter-layer protection applied as required.
8. Non-Destructive Testing (NDT): 100% inspection via Eddy Current Testing (ECT), ultrasonic testing, and/or hydrostatic pressure testing.

5. Packaging and Handling Specification

5.1 Packaging Configuration

To mitigate the risk of transportation damage (Transportation Damage) — including surface scratches, dents, coil deformation, and edge chipping — the following multi-layer packaging system is mandated:

• Primary Protection: Each coil tube is wrapped in heavy-duty industrial plastic film (stretch film / cling wrap) with a minimum thickness of 50 μm to provide moisture barrier and initial mechanical protection.
• Secondary Protection: Internal partitions (interlayer separators) made of corrugated cardboard or foam board are inserted between coil layers at intervals not exceeding 100 mm to prevent inter-layer contact and abrasion.
• Outer Enclosure: The protected coil is secured within a wooden crate (Wooden Case / ISPM-15 Heat-Treated Pallet & Crate) constructed from kiln-dried hardwood (minimum 25 mm wall thickness). The crate is reinforced with steel banding at intervals of ≤ 300 mm along the perimeter.
• Internal Securing: V-bands or steel strapping are applied circumferentially around the coil within the crate to prevent radial expansion or shifting during transit.
• Moisture Control: Desiccant packs (silica gel, ≥ 500 g per crate) and moisture-barrier vapor-proof film are included to prevent condensation-induced staining (Stress Corrosion Cracking initiation risk).

5.2 Handling and Loading/Unloading Prohibitions

STRICT PROHIBITIONS: Under no circumstances shall the packaged coil tube be subjected to throwing, dropping, rolling, sliding, or impact loading during any stage of loading, unloading, transshipment, or internal handling. All movements must be executed using appropriate mechanical lifting equipment (forklift, crane, coil handler) with soft-lift slings or purpose-built coil saddles.

• No Throwing or Dropping: Manual handling that results in any uncontrolled release of the package is strictly forbidden.
• No Rolling: The crate must never be rolled on its side or end, as this may cause internal coil displacement, partition failure, or structural compromise of the wooden enclosure.
• No Sliding on Concrete: Direct contact of the wooden crate base with rough concrete surfaces during movement is prohibited; use of dollies or skates is mandatory.
• Lifting Orientation: Lift only from designated lifting points marked on the crate. Do not lift by forking through the crate walls unless the crate design explicitly permits it.
• Stacking Limitation: Maximum stacking height: 1 layer (single-tier only) to prevent excessive compressive loads on the lower coil.

5.3 Arrival Inspection and Claim Protocol

The contractual framework governing the delivery of this product includes explicit provisions for visual inspection standards (Visual Appearance Acceptance Criteria) and claim/remedy clauses:

1. Timeframe: The consignee must conduct visual inspection of the packaging integrity within 48 hours of delivery receipt. Any evidence of external damage (crushed crate, broken strapping, torn wrap film, visible dents) must be documented with photographs and reported to the seller in writing.
2. Acceptance Criteria: Upon unpacking, the coil tube surface must be free from:
   • Scratches exceeding 10 mm in length or 0.5 mm in depth;
   • Dents or deformations exceeding 1% of the outer diameter;
   • Rust staining, mill scale, or discoloration;
   • Coil layer separation or structural displacement;
   • Moisture damage or condensation staining.
3. Claim Procedure: Non-conforming product must be quarantined and preserved in its original packaging condition. A formal claim notice must be submitted within 7 calendar days of delivery, accompanied by photographic evidence, carrier damage report (if applicable), and a sample or full coil identification marking.
4. Remedy: Upon verified claim acceptance, the seller shall, at its discretion, provide: (a) full replacement of the damaged coil at no additional cost; (b) proportional credit/refund; or (c) repair service where technically feasible without compromising product specifications.
5. Carrier Liability: Where damage is attributable to carrier negligence, the seller will assist the buyer in filing claims with the transportation carrier, with the seller bearing all administrative costs associated with the claim process.

6. Applications

Stainless steel coil tubes find extensive application across multiple industries:

• Food and Beverage Processing: Hygienic piping systems, heat exchangers, brewing equipment (304/316L grades).
• Chemical and Petrochemical: Corrosive fluid transfer lines, reactor internals, distillation columns (316L, 904L, Hastelloy-compatible).
• Medical Devices: Surgical instrument tubing, implant-grade components (316L, ASTM F138).
• Automotive: Exhaust system components, fuel lines, turbocharger manifolds.
• Construction and Architecture: Structural tubing, balustrades, decorative elements.
• Energy and Power: Solar thermal absorber tubes, boiler feedwater lines, nuclear-grade components.
• Pharmaceutical: Clean-in-place (CIP) piping, process vessels, sanitary fittings.

7. Quality Certifications and Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains the following certifications and compliance frameworks:

• ISO 9001:2015 — Quality Management System
• ISO 14001:2015 — Environmental Management System
• ISO 45001:2018 — Occupational Health and Safety Management System
• EN 10204 3.1 — Material Test Certificate (MTC) with full traceability
• CE Marking — Conformity with European directives (PED 2014/68/EU where applicable)
• Mill Test Reports (MTR): Provided for every heat lot, including chemical composition (spectrometric analysis), mechanical properties (tensile test, hardness test), and dimensional verification.
• NDT Reports: Eddy current and/or ultrasonic inspection reports available upon request for critical applications.

8. Unique Selling Points

• Integrated Risk Prevention System: The company's packaging and handling protocol is designed as a comprehensive risk mitigation framework, addressing the full supply chain from mill to end-user with zero-tolerance policies on physical damage.
• Contractual Accountability: Explicit, enforceable acceptance criteria and claim procedures provide buyers with legal recourse and operational certainty — a distinguishing advantage over suppliers who offer ambiguous or absent delivery inspection terms.
• Multi-Layer Protective Packaging: The combination of stretch film wrapping, interlayer partitioning, and heat-treated wooden crate enclosure provides defense-in-depth protection against mechanical, moisture, and environmental damage.
• Full Traceability: Every coil is heat-number traceable from raw material mill through to final delivery, enabling rapid root-cause analysis in the event of quality disputes.

9. Conclusion

The packaging and handling specification for Wenzhou Jixing Metal Materials Co., Ltd.'s stainless steel coil tube product represents a systematic approach to ensuring product integrity throughout the logistics chain. By enforcing strict prohibitions on improper handling methods and establishing clear, contractually binding arrival inspection and claim protocols, the company minimizes the risk of transportation-induced damage — a critical concern in the stainless steel pipe and tube industry where surface quality directly impacts corrosion performance and service life. Customers are advised to review and incorporate these specifications into their procurement contracts to ensure mutual protection and operational continuity.