Corrosion-HIC NACE TM0284

HIC Testing (NACE TM0284) | Hydrogen Induced Cracking | Subodh Material Technologists

NACE TM0284 HIC Testing Services

Protect Your Critical Assets from Hydrogen-Induced Cracking in Sour Environments

When your operations involve wet hydrogen sulfide (H₂S), the structural integrity of your pipeline and pressure vessel steels is constantly under threat. At Subodh Material Technologists, we provide fully accredited NACE TM0284 testing to evaluate your materials, ensure compliance, and prevent catastrophic failures before they happen.

What is HIC and Why is NACE TM0284 Essential?

In "sour service" environments, hydrogen atoms generated by corrosion can penetrate carbon and low-alloy steels. These atoms combine internally to form hydrogen gas, creating immense pressure that leads to blisters, cracks, and sudden material failure—a phenomenon known as Hydrogen-Induced Cracking (HIC).

The NACE TM0284 standard is the globally accepted test method for evaluating a steel's resistance to HIC. By simulating a harsh sour environment in our laboratory, we can determine exactly how your steel will perform in the field, ensuring it meets strict regulatory standards like NACE MR0175 / ISO 15156.

How Our NACE TM0284 HIC Testing Works

Subodh Material Technologists conducts rigorous, standardized evaluations to guarantee the safety of your materials. Our process includes:

Precision Specimen Preparation: We carefully machine unstressed test specimens directly from your steel pipes, plates, or fittings in our in-house machine shop.
Controlled Immersion: Samples are immersed for a standard 96 hours in a specialized aqueous solution saturated with H₂S gas at standard temperature and pressure. We utilize Solution A or Solution B based on your specific environmental requirements.
Microscopic Evaluation: After the test cycle, we section the specimens and perform a high-magnification metallurgical examination to identify and measure any internal cracking.

Clear, Actionable Reporting

Following the test, Subodh Material Technologists provides a comprehensive, audit-ready metallurgical report. We calculate and report the three critical metrics required to determine if your material passes or fails your specific acceptance criteria:

CLR (Crack Length Ratio): Assesses the total length of the cracks.
CTR (Crack Thickness Ratio): Assesses the total thickness or depth of the cracks.
CSR (Crack Sensitivity Ratio): Assesses the overall area impacted by cracking.

Why Choose Subodh Material Technologists for HIC Testing?

Accredited Excellence: Our laboratory is fully accredited to ISO/IEC 17025, ensuring precise, unbiased, and legally defensible results.
Fast Turnaround Times: We understand that project timelines are tight. We prioritize efficient testing and prompt reporting without compromising accuracy.
Expert Metallurgists: Our dedicated team has years of specialized experience evaluating materials for the most demanding sour service applications in the oil and gas sector.
Comprehensive Solutions: Beyond HIC testing, we offer a complete suite of mechanical, chemical, and metallurgical testing services under one roof.

Industries We Serve

We partner with safety-conscious organizations across India and globally, including:

Oil & Gas Exploration and Production
Petrochemical Refining
Offshore Drilling and Marine Infrastructure
Pipeline Manufacturing and Distribution

Don't Leave Your Infrastructure to Chance

Ensure your steels are certified for sour service. Partner with Subodh Material Technologists for accurate, timely, and reliable NACE TM0284 HIC testing.

After a steel specimen undergoes the 96-hour HIC test in a sour environment (H2S), it is sectioned (cut open) and examined under a microscope. Metallurgists measure the dimensions of any internal blisters or cracks they find. Those measurements are then used to calculate the following three percentages:

1. CLR (Crack Length Ratio)

CLR measures how far the cracks spread horizontally across the material. It evaluates the cumulative length of all stepwise cracks relative to the total width of the test section. High CLR indicates long, continuous cracks that could easily lead to material separation.

2. CTR (Crack Thickness Ratio)

CTR measures the vertical severity of the cracks. It evaluates the cumulative thickness (or depth) of the cracks relative to the total thickness of the test section. High CTR indicates that the cracks are propagating deeply through the wall thickness of the pipe or vessel, which is highly dangerous for pressurized equipment.

3. CSR (Crack Sensitivity Ratio)

CSR provides a comprehensive look at the overall area affected by the cracking. It calculates the total area of all cracks relative to the total cross-sectional area of the test specimen. This gives an aggregate score of how "sensitive" or susceptible the steel is to forming hydrogen-filled voids.

What are the Acceptance Criteria?

The NACE TM0284 standard dictates how to test and calculate these ratios, but it does not set strict pass/fail limits. The acceptance limits are usually defined by the client's engineering specifications or by broader industry codes (like NACE MR0175 / ISO 15156).

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