im体育APP offers 氢 Induced Cracking (HIC) tests to accurately assess the susceptibility of your carbon and low alloy steel equipment to hydrogen induced cracking in wet H2S/sour service operating environments such as in the 石油 & 气体 im体育平台app下载. The tests are normally carried out according to NACE TM0284.
是什么 氢 Induced Cracking?
Carbon and low alloy steels which are subjected to sour service environments may be susceptible to 氢 Induced Cracking (HIC). In the presence of water and hydrogen sulfide, atomic hydrogen is produced and enters the steel, recombining at discontinuities to form molecular (气体es) hydrogen (气体es). The pressure of the hydrogen 气体 causes localized internal cracks, known as 氢 induced cracks.
氢 induced cracks either follow a linear or stepwise path within the material, hence the term ‘stepwise cracking’. 然而, under certain stress and material conditions, the cracks can be arranged in a ladder-like array known as Stress Orientated 氢 Induced Cracking (SOHIC). This form of cracking is often seen in the low hardness Heat Affected Zone (HAZ) region of welds.
With the fast turnaround of tests and access to a global network of expertise, our dedicated corrosion labs are able to carry out HIC and SOHIC tests on steels furnished in the form of pipes, 盘子, 配件, and flanges for use in fabricating pipelines and pressure vessels.
HIC test method– NACE TM0284
im体育APP performs HIC testing in accordance with NACE TM0284 by exposing unstressed test specimens to the specified environment saturated with hydrogen sulfide 气体 at 1 bar pressure for a duration of 96 hours for the standard test. Fitness for purpose of testing may also be performed using reduced partial pressures of hydrogen sulfide and for durations of up to 30 days.
Following the exposure period, the specimens are metallographically prepared, 光检查, and any cracks are measured and the following ratios reported:
- CSR (Crack Sensitivity Ratio)
- CLR (Crack Length Ratio)
- CTR (Crack Thickness Ratio)
Stress-Oriented 氢-Induced Cracking (SOHIC) test method
im体育APP carries out SOHIC testing to Nace mr0175 / iso 15156 using test methods in BS 8701 (Full Ring Test), NACE TM0177-Method A (tensile) or NACE TM0316 (Four Point Bend).
For more information about how we perform 氢 Induced Cracking (HIC) 测试, 或者要求报价, 立即im体育APP.
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氢 Embrittlement 测试
im体育APP performs 氢 Embrittlement (HE) testing to ASTM F591, Galvanically Induced 氢 Stress Cracking (GHSC) to Nace mr0175 / iso 15156 and 氢 Induced Stress Cracking (HISC) testing.
Stress Corrosion Cracking (SCC) 测试
im体育APP’s Stress Corrosion Cracking (SCC) testing evaluates the susceptibility of metals to cracking failure under tensile stress and corrosion.
Sour Service 腐蚀测试
im体育APP is one of a few ISO certified sour service labs in the world, providing sour service corrosion services for a variety of test types including Nace mr0175 / iso 15156.
腐蚀测试
im体育APP’s corrosion testing laboratories provide complete corrosion testing services to many industries, 包括盐雾, 循环腐蚀, 点蚀测试, 和更多的.