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Sour Service Steel Plate HIC Resistant
Brand: Promisteel
Grade: A25,A,B,X42,X46,X52,X56,X60,X65,X70,X80,X90,X100,X120
MOQ: 25tons
Application: Sour Service Steel Plates (HIC Resistant) are used in pipelines transporting sour oil and gas.
Capacity:10000 Ton/month
Delivery: 20-45 days
Payment: T/T, L/C, etc
In sour oil and gas environments, hydrogen sulfide (H₂S) exposure poses a critical threat to steel materials, with hydrogen-induced cracking (HIC) being one of the most destructive failure modes. HIC occurs when hydrogen atoms, generated by H₂S corrosion, diffuse into the steel matrix and accumulate at inclusions or grain boundaries, leading to internal cracking that compromises structural integrity. Our HIC-resistant sour service steel plate is specifically engineered to mitigate this risk, providing reliable performance for critical pipeline and equipment applications in harsh acidic environments.
Core Performance: Superior HIC Resistance
Rigorous Compliance with NACE TM0284-2016
Our steel plates undergo stringent HIC testing in accordance with NACE TM0284-2016, the industry benchmark for evaluating HIC susceptibility:
Test Environment Simulation: Depending on field conditions, either Solution A (pH 2.7±0.1, for high-acidity scenarios) or Solution B (pH 4.0±0.2, for moderate sour environments) is used, both saturated with H₂S (≥90% saturation).
Testing Protocol: Samples are immersed in the H₂S-saturated solution for 96 hours at 24±3℃, replicating long-term exposure to sour conditions.
Critical Metrics: Post-test analysis confirms exceptional resistance, with results consistently meeting or exceeding industry requirements:
Crack Length Ratio (CLR) ≤5%
Crack Thickness Ratio (CTR) ≤2%
Crack Sensitivity Ratio (CSR) ≤1%
Distinction from SSC: Targeted Protection
While sour environments may also involve sulfide stress corrosion cracking (SSC) - a failure mode driven by the combination of tensile stress and H₂S - our product focuses specifically on HIC resistance. HIC differs from SSC in that it occurs without applied stress, caused solely by hydrogen diffusion and accumulation. For applications requiring combined HIC and SSC protection, we offer tailored solutions, but this plate is optimized for scenarios where HIC is the primary risk.
Composition & Manufacturing
Engineering for HIC Resistance
The exceptional HIC performance of our steel plate stems from precise control over composition and production processes:
Strict Control of Harmful Elements
Sulfur (S) ≤0.001% (10 ppm): Minimizes sulfide inclusions, which act as primary initiation sites for HIC.
Phosphorus (P) ≤0.010%: Reduces grain boundary brittleness, lowering hydrogen trapping susceptibility.
Hydrogen (H) ≤2 ppm: Strict dehydrogenation processes limit internal hydrogen pressure buildup.
Alloy Design for Hydrogen Mitigation
Chromium (Cr: 1.0-1.5%): Enhances surface passivation, reducing H₂S adsorption and subsequent hydrogen generation.
Molybdenum (Mo: 0.2-0.4%): Inhibits hydrogen diffusion through the steel matrix, slowing crack propagation.
Niobium (Nb: 0.02-0.05%): Refines grain structure and stabilizes carbides, minimizing hydrogen traps.
Heat Treatment for Microstructural Stability
All plates undergo 600-650℃ tempering (holding time 3-4 hours) to relieve residual stresses and optimize microstructure, further reducing HIC susceptibility.
Field Application: Proven in Sour Environments
In a 180km sour oil pipeline project in Southeast Asia, operated by a leading energy company, the operating conditions are quite challenging: the H₂S content reaches 5,000 ppm, with a temperature of 35℃ and an operating pressure of 10 MPa, while periodic injection of film-forming corrosion inhibitor is adopted for protection.
After 5 years of actual operation, the project has demonstrated excellent performance: in the annual ultrasonic inspections conducted in accordance with API 5L standards, no hydrogen-induced cracking (HIC) has been detected; the average wall thickness reduction of the pipeline is 0.15mm, which is only 0.03mm per year, well below the allowable corrosion rate in sour environments; in addition, compared with projects using conventional steel, its maintenance costs have been reduced by 35%, and this data has been verified and confirmed by a third-party audit report (No. SEA-2024-112).
Value Proposition
Our HIC-resistant steel plate enables pipe manufacturers to:
-
Meet strict sour service standards (NACE, API) for critical oil and gas projects.
- Enhance product reliability in H₂S-rich environments, reducing downtime and failure risks.
- Access high-end markets requiring certified HIC resistance, boosting competitive advantage.
Note: Detailed HIC test reports, including solution compositions and microstructural analysis, are available upon request. For applications requiring SSC resistance, please consult our technical team for customized solutions.
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