Application of medium frequency heat expanded seamless steel pipe in petrochemical, chemical, and electric power industries.

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In order to promote the application of medium frequency thermal expansion seamless steel pipe in petrochemical, chemical, coal chemical and electric power industries, support the construction of large-scale projects, and improve the transmission efficiency of pipelines and the scale economic benefits of devices, China Petroleum and Petrochemical Engineering Research Association organized the "Application of medium frequency thermal expansion seamless steel pipe in petrochemical, coal chemical and electric power industries" in Wuxi, Jiangsu Province on April 10, 2021 Chemical and electric power industry promotion and application seminar ", from Sinopec refining and Chemical Engineering (Group) Co., Ltd., metallurgical industry information standard research institute, China special equipment testing and Research Institute, steel pipe sub Technical Committee of National Steel Standardization Technical Committee, steel pipe branch of China Steel Structure Association, Shanghai steel pipe industry Association, Sinopec Engineering Construction Co., Ltd China Huanqiu Engineering Co., Ltd., Sinopec Luoyang (Guangzhou) Engineering Co., Ltd., Sinopec Shanghai Engineering Co., Ltd., Sinopec Nanjing Engineering Co., Ltd., Sinopec Ningbo Engineering Co., Ltd., Northeast Electric Power Design Institute Co., Ltd., Dexin steel pipe (China) Co., Ltd. and design institutes (institutes) of petrochemical, chemical, coal chemical and boiler power industries More than 100 leaders and experts from engineering companies, users and steel pipe manufacturers attended the meeting.

The delegates listened to the report on the analysis of domestic large diameter seamless steel pipe production equipment and process characteristics, the application of large diameter seamless steel pipe in petrochemical, chemical, and electric power industries, the introduction of medium frequency hot expansion seamless steel pipe process, quality control and typical application, and made comments on the medium frequency hot expansion seamless steel pipe production process, equipment capacity, detection means, quality control and typical application of German new steel pipe Quality assurance system and product inspection report were reviewed and discussed

According to the revision opinions and scheme of GB / t5310-2017 standard, the manufacturing site and inventory of large diameter seamless steel pipe of Dexin steel pipe were inspected. After full discussion, the expert group composed of Representatives (see the annex for the list) formed "opinions on the promotion and application of medium frequency thermal expansion seamless steel pipe in petrochemical, chemical and electric power industries" (see the annex).

The opinion on the application of medium frequency heat expansion seamless steel pipe in petrochemical, chemical, and power industries is discussed. 1. If the heat expansion process is to use the finished steel pipe which meets the technical requirements of ordering as the main pipe, and then expand it into a pipe after continuous heating of intermediate frequency

The production technology of larger diameter steel pipe has the characteristics of flexible customization and a short period, which is an effective supplement to the rolling, drawing, and extrusion of steel pipes. For seamless steel pipes with an outer diameter of 323mm, a diameter to wall ratio (d/s) greater than 45 and an outer diameter of more than 508mm and diameter to wall ratio (d/s) greater than 25, it is difficult to produce seamless steel pipes in hot rolling units, and welding pipes that are difficult to organize production, medium frequency heat expansion seamless steel pipes can be used.

2. the manufacturing unit of medium frequency heat expansion seamless steel pipe shall meet the following conditions:

(1) The manufacturer shall obtain the national manufacturing license for pressure pipe components; its type test certificate and type test report must cover the materials and specifications of the supplied medium frequency heat expansion seamless steel pipe; its typical products shall pass the high-temperature mechanical properties and high-temperature long-term strength verification test required in Appendix A and Appendix B of gb/t 5310-2017 standard.

(2) The manufacturer shall have production equipment, NDT equipment, and heat treatment equipment suitable for the size and specification of the heat expansion steel pipe.

(3) The manufacturer shall have a complete quality assurance system.

3. the manufacturing of medium frequency heat expansion seamless steel pipe shall meet the following requirements:

(1) The chemical composition and steelmaking process shall be strictly required for the return materials.

(2) The process of medium frequency heat expansion should follow strict technical specifications, including the size of core rod, the size of intermediate frequency heating coil, heating temperature, propulsion speed, expanding ratio, and other process parameters. (.) the steel pipe after heat expansion shall be treated as a whole according to the qualified heat treatment process specification.

(4) Steel pipes shall be strictly non-destructive testing, including automatic ultrasonic testing, eddy current testing, or magnetic leakage test. The qualified indexes shall not be lower than the requirements of relevant standards. After years of innovation and improvement, the technology of medium frequency heat expansion steel pipe has been mature. Through various inspection and testing and the practical application of millions of tons of medium frequency heat expansion steel pipe under various complex conditions, it is shown that the qualified medium frequency heat expansion steel pipe manufactured and inspected according to the standard can be widely used in petrochemical, chemical, coal chemical, and power projects

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