Stainless Steel Coil Tube (Coiltube) — Non-Standard Additional Testing Services

Product Overview

Wenzhou Jixing Metal Materials Co., Ltd. offers a comprehensive suite of non-standard additional testing services for stainless steel coil tubes (Coiltube), extending beyond the standard quality assurance protocols included in the base product price. These supplementary inspection and certification programs are designed to meet the rigorous demands of specialized industries requiring documented proof of material integrity, corrosion resistance, and surface cleanliness at project-specific or batch-specific levels.

The additional testing framework encompasses three core service categories: third-party re-inspection, special corrosion testing, and full-lot cleanliness verification. These services are quoted individually per project or per batch and are not included in the base material pricing, ensuring transparent cost allocation for end users who require enhanced quality assurance documentation.

Material & Properties

Stainless steel coil tubes supplied by Wenzhou Jixing Metal Materials Co., Ltd. are manufactured from austenitic, ferritic, and duplex stainless steel grades conforming to international standards including ASTM, EN, JIS, and GB specifications. The base material properties are as follows:

Specifications — Additional Testing Services

Testing Category Description Applicable Standards Reporting Basis Pricing Model
Third-Party Re-Inspection
(第三方复检)		 Independent verification of chemical composition, mechanical properties, dimensional accuracy, and surface quality by accredited external laboratories (e.g., SGS, BV, TÜV, Intertek) ASTM A269, ASTM A312, EN 10216, ISO 3506 Per lot / Per heat number / Per project Quoted separately per project or batch; not included in base price
Special Corrosion Testing
(特殊腐蚀试验)		 Accelerated corrosion testing including salt spray test (NSS), intergranular corrosion test (IGC), pitting resistance evaluation (PREN), crevice corrosion test, and custom media immersion testing ASTM G48, ASTM G102, ASTM A923, ISO 9227, ASTM G119 Per sample set / Per grade / Per application scenario Quoted separately per project or batch; not included in base price
Full-Lot Cleanliness Inspection
(全检清洁度)		 100% inspection of internal and external surface cleanliness, including particulate matter analysis, oil residue measurement, oxide scale verification, and visual inspection under controlled lighting conditions ASTM A240, EN 10088, ISO 8402, Project-specific cleanliness protocols 100% of coils / Per batch / Per coil ID Quoted separately per project or batch; not included in base price

Manufacturing Process & Testing Integration

The stainless steel coil tube manufacturing process at Wenzhou Jixing Metal Materials Co., Ltd. follows a multi-stage production workflow designed to accommodate additional testing at critical control points:

  1. Raw Material Receipt & Incoming Inspection: Hot-rolled coils are received and subjected to initial chemical analysis and visual inspection. Material test reports (MTR) from the mill are verified against purchase order specifications.
  2. Cold Rolling & Forming: Coils are cold-rolled to target thickness and formed into tube profiles. Dimensional controls are maintained throughout the process.
  3. Heat Treatment (Annealing & Pickling): Tubes undergo controlled annealing to relieve residual stresses, followed by pickling to remove oxide scale. This stage is critical for corrosion resistance performance.
  4. Surface Finishing: Final surface preparation including polishing, passivation, or custom finishing as specified by the customer.
  5. Standard Quality Assurance: Routine testing including dimensional measurement, chemical spot-checking, and basic mechanical property verification per applicable standards.
  6. Additional Testing Integration (Non-Standard):
    • Third-party samples are drawn at designated intervals and dispatched to accredited external laboratories for independent verification.
    • Corrosion test specimens are prepared per ASTM G48 / ASTM A923 protocols and subjected to accelerated aging or immersion conditions as specified.
    • Full-lot cleanliness inspection is performed using calibrated equipment including particle counters, ultrasonic thickness gauges, and high-resolution visual inspection stations.
  7. Final Documentation & Release: Complete test reports, certificates of conformance, and additional testing documentation are compiled and issued to the customer prior to shipment.

Applications

The enhanced testing services for stainless steel coil tubes are particularly valuable in the following application sectors:

Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains a robust quality management system and holds the following certifications and compliance credentials:

Unique Selling Points

Ordering & Quotation Process

Customers requiring non-standard additional testing services should provide the following information to Wenzhou Jixing Metal Materials Co., Ltd. for a detailed quotation:

  1. Stainless steel grade and specification (e.g., ASTM A312 Type 316L)
  2. Coil tube dimensions (OD, wall thickness, length/coil weight)
  3. Quantity (number of coils, total weight, number of heats)
  4. Specific testing requirements (third-party inspection scope, corrosion test type, cleanliness criteria)
  5. Applicable standards or project-specific protocols
  6. Target delivery schedule and testing timeline
  7. Destination and any export compliance requirements

Important Note: All non-standard additional testing services are quoted on a per-project or per-batch basis and are not included in the base material price. Final pricing depends on the scope of testing, number of samples, selected laboratory, and project complexity. Contact the sales engineering team for a customized quotation.