| Standard: | ANSI, DIN, GB, JIS, GOST, BSW |
|---|---|
| Type: | Welding Flange |
| Material: | Hic Sscc |
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| Definition and Principle | |
| Hydrogen Induced Cracking (HIC): | In an environment containing hydrogen sulfide and other substances, hydrogen atoms will penetrate into the interior of the metal material and accumulate at the positions of internal defects, inclusions, etc. of the material. When the hydrogen atoms accumulate to a certain extent, internal stress will be formed, leading to the generation of cracks inside the material. This phenomenon is called hydrogen induced cracking. HIC flanges are made to have the ability to resist this hydrogen induced cracking phenomenon through special material selection and process treatment. |
| Sulfide Stress Corrosion Cracking (SSCC) | In an environment where hydrogen sulfide exists, the metal material will undergo corrosion cracking under the action of tensile stress (including applied stress and residual stress), which is called sulfide stress corrosion cracking. SSCC flanges are flanges that can resist the corrosion cracking caused by the combined action of the sulfide environment and stress. |
| Application Scenarios | |
| Petrochemical Industry | In the processes of oil refining, natural gas exploitation, etc., media containing hydrogen sulfide are often encountered. For example, in the pipeline connections of equipment such as sulfur-containing crude oil processing units and natural gas desulfurization units, HIC SSCC flanges are required to ensure the safe operation of the equipment and prevent accidents such as leakage caused by hydrogen induced cracking and sulfide stress corrosion cracking |
| Coal Chemical Industry | In processes such as coal gasification and coal liquefaction, an environment containing corrosive gases such as hydrogen sulfide will also be generated. In the relevant pipeline systems, HIC SSCC flanges can ensure the reliability and tightness of pipeline connections. For example, in the pipeline connections of coal gas purification devices. |
| Manufacturing Requirements | |
| Material Selection | Steel materials with low impurity contents such as sulfur and phosphorus are usually selected, such as some special carbon steels, alloy steels, etc. For example, Q245R (HIC) steel plates are often used to manufacture flanges resistant to hydrogen induced cracking and sulfide stress corrosion, and the contents of elements such as sulfur and phosphorus are strictly controlled |
| Manufacturing Process | During the forging process, the forging ratio should be controlled to ensure the density and uniformity of the material. In terms of heat treatment, processes such as normalizing and tempering are often adopted to obtain a good metallographic structure and improve the corrosion resistance and mechanical properties of the material. |
| Testing Standards | |
| HIC Testing Standards | Commonly used ones include NACE TM0284-2016, GB/T 8650-2015, etc. The main method is to place the sample in a specific hydrogen sulfide-containing solution. After a certain period of time, check whether the sample has defects such as cracks. The hydrogen induced cracking resistance of the material is evaluated through indicators such as the Crack Sensitivity Ratio (CSR), Crack Length Ratio (CLR), and Crack Thickness Ratio (CTR). |
| SSCC Testing Standards | Such as NACE TM0177-2016, GB/T 4157-2017, etc. Generally, a certain stress is applied to the sample in an environment containing hydrogen sulfide, and the sample is observed for whether cracking occurs and the cracking situation to evaluate the sulfide stress corrosion cracking resistance of the material. |
Dingxiang Jinyu Forging Co., Ltd. is located in Dashagou Village, jiangcun Township, Dingxiang County, Xinzhou,known as the "hometown of Chinese forging", with a registered capital of 5 milion yuan. Superior geographical location, 100 kilometers away from the provincial capital Taiyuan, with convenient and fast road and railway transportation. Rich in coal, electricity, and iron resources, we are a professional manufacturer of forged fanges and pressure vessel forgings; We have the ability to integrate design, raw material procurement, cutting, forging, heat treatment, machining, mechanical testing, non-destructive testing, mechanical typing, painting, packaging, and shipping operations. The annual production capacity is over 10000 tons, with specifications ranging from DN15 to DN6000mm. The maximum weight per unit of finished products is 20 tons, and the pressure ranges from 150-2500 pounds, including national standards, American standards, British standards, German standards, Japanese standards,and non-standard fanges and forgings.
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