Hydrogen-Induced Cracking (HIC) Resistant Stainless Steel Coil Tube — NACE MR0175 Compliant

Product Overview

Wenzhou Jixing Metal Materials Co., Ltd. (Product Code: 110) offers premium-grade stainless steel coil tubes engineered for demanding sour service environments. These coil tubes are specifically designed and certified to resist hydrogen-induced cracking (HIC) under prolonged exposure to hydrogen sulfide (H₂S) saturated solutions, in full compliance with the internationally recognized NACE TM0284 testing standard. As a mandatory inspection item for anti-sulfur tubing conforming to NACE MR0175, the HIC resistance performance represents a critical safety and reliability benchmark for applications in the oil, gas, and petrochemical industries.

The coil tube format provides exceptional flexibility in downstream forming, bending, and processing operations while maintaining the material's inherent corrosion resistance and mechanical integrity. This product is manufactured under rigorous quality control protocols that ensure consistent performance across every batch.

Material & Properties

These coil tubes are fabricated from austenitic and duplex stainless steel grades selected for their superior resistance to sulfide stress corrosion cracking (SSCC) and hydrogen-induced cracking. The material composition is carefully controlled to minimize the formation of detrimental microstructural features such as martensite and carbide precipitates that could serve as crack initiation sites in sour environments.

Specifications

Parameter Specification Standard Reference
Product Form Coil Tube (盘管) —
Outer Diameter 6.0 – 50.8 mm (0.236 – 2.000 in) ASTM A213 / ASME SA-213
Wall Thickness 0.5 – 4.0 mm (0.020 – 0.157 in) ASTM A213 / ASME SA-213
Coil Inner Diameter 150 – 600 mm (5.9 – 23.6 in) —
Surface Finish Bright annealed / Pickled & passivated ASTM A479
HIC Test Method H₂S Saturated Solution Immersion, 96 hours NACE TM0284
MR Compliance NACE MR0175 / ISO 15156 —
Test Temperature 23 ± 3°C (73 ± 5°F) NACE TM0284
Acid Number (AN) ≥ 5.0 NACE TM0284
Acceptance Criteria No cracking, no blistering, no hydrogen blistering (HB) exceeding specified limits NACE TM0284 / MR0175
Product Standard ASTM A269, ASTM A213, EN 10216-5 —

Hydrogen-Induced Cracking (HIC) Test — NACE TM0284

Mandatory Requirement: HIC testing in accordance with NACE TM0284 is a compulsory inspection item for all anti-sulfur tubing manufactured to meet NACE MR0175 / ISO 15156 requirements. This test verifies the material's ability to withstand prolonged exposure to hydrogen sulfide without degradation.

Test Procedure

  1. Specimen Preparation: Test coupons are machined from production tubing to standardized dimensions per NACE TM0284 requirements, ensuring representativeness of the final product microstructure.
  2. Solution Preparation: A saturated H₂S solution is prepared with a minimum acid number (AN) of 5.0, containing specific concentrations of ammonium thiocyanate, sodium chloride, and hydrochloric acid to simulate sour service conditions.
  3. Immersion Duration: Specimens are fully immersed in the H₂S saturated solution for a minimum of 96 hours at a controlled temperature of 23 ± 3°C (73 ± 5°F).
  4. Post-Test Examination: After immersion, specimens are examined for evidence of hydrogen-induced cracking through visual inspection, replica metallography, and cross-sectional analysis. No cracks, blisters, or hydrogen damage exceeding acceptance criteria are permitted.

Manufacturing Process

The production of HIC-resistant stainless steel coil tubes follows a tightly controlled multi-stage manufacturing process:

  1. Raw Material Selection: Only certified ingots or slabs from approved mills with documented chemical composition and traceability are accepted. Ultra-low carbon grades are preferred to minimize carbide precipitation.
  2. Hot Rolling & Piercing: Billets are hot-rolled into hollow rounds or seamless tubes through a controlled piercing process that maintains uniform wall thickness and dimensional accuracy.
  3. Cold Drawing / Cold Expansion: Tubes undergo precision cold working to achieve final dimensions, enhanced surface finish, and improved mechanical properties.
  4. Stress-Relief Annealing: A carefully controlled thermal treatment cycle eliminates residual stresses from cold working, stabilizes the microstructure, and prevents the formation of strain-induced martensite — a critical step for HIC resistance.
  5. Pickling & Passivation: Tubes are cleaned and passivated to remove surface contaminants, oxide scales, and any free iron contamination that could compromise corrosion resistance in sour environments.
  6. Coiling: Finished tubes are coiled to specified diameters with protective end caps and packaging to prevent mechanical damage during storage and transport.
  7. Non-Destructive Testing (NDT): Each coil is subjected to eddy current testing, hydrostatic testing, and dimensional verification prior to shipment.

Applications

These HIC-resistant stainless steel coil tubes are specifically engineered for the most demanding sour service environments:

Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems and certifications to ensure every product meets or exceeds international standards:

Unique Selling Points

Technical Support & Ordering Information

Wenzhou Jixing Metal Materials Co., Ltd. provides comprehensive technical support including material selection guidance, application-specific recommendations, and post-delivery consultation. Custom specifications, non-standard dimensions, and special testing requirements are accommodated upon request. Contact our technical sales team for detailed quotations, sample availability, and project-specific engineering support.