Seeking standards for pipeline materials
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H2, 345°C, 20 MPa (assuming it is the hydrogen partial pressure); you can choose either 12Cr2Mo or 12Cr5Mo domestic steel pipes. I would appreciate suggestions from those who have in-depth knowledge of these materials. 1. Are there suitable domestic pipe manufacturing standards capable of handling this task? 2. If domestic materials are sufficient, which of the two recommended materials is better to choose? 3. If domestic materials are not suitable, is it necessary to use materials that meet American standards in order to manufacture SH3405 for use with flanges of higher grades such as those specified in SH3406 with PN260 and PN420 ratings? P.S: If you are not very familiar with this topic, please leave a message to ask for guidance; do not make any unfounded statements to avoid misleading future learners. Thank you all, experts!
The current standard includes a general technical specification for chemical industry high-pressure pipelines, HGT 20256-2016, which addresses the selection of pipeline materials. It can be used as a reference.
Dear experts, please provide professional answers!
Very good, thank you to the original poster for sharing! Thanks!
Very good, thank you to the original poster for sharing! Thanks!
1. When selecting materials, the decarburization issue must be taken into account; according to the Nelson curve, 12Cr2Mo should not be chosen at these temperatures and pressures. 12Cr5Mo is the minimum requirement. 2. When selecting flanges, if HG/T20615-2009 flanges are used, then CL2500 flanges must be employed (i.e., 12Cr5Mo forged flanges). 3. Theoretically, domestic materials are viable, and domestic standards are also acceptable. However, from an engineering perspective (in the petrochemical/refining industry), when we reach the CL900 grade and the medium is flammable and toxic, we opt for American-standard materials and flanges; especially in the case of hydrogen as the medium, extra caution is required.
It is recommended to use stainless steel, as it does not suffer from decarburization