On August 19, 2020, Dongfang Boiler Co., Ltd. of Dongfang Electric Group in Zigong City, Sichuan Province received good news. hanyesteel’s 150mm thick high-pressure steam drum plate 13MnNiMoR passed the company’s boiler vessel steel certification. The steel plate is being tested. The performance indicators in the medium are qualified and the simulated use performance is good. It can be used in the high-pressure container steam drum manufacturing industry. This marks another big step forward for the special container steel plate produced by Nanyang Hanye Special Steel Co., Ltd. in the steam drum industry.
In response to the group company’s slogan of enhancing competitiveness with “richness, improvement, reduction, and excellence” as the core, Nanyang Hanye Special Steel blew the Charge for the 150mm 13MnNiMoR certification campaign. In September 2018, Hanye Special Steel Research Institute and sales personnel went to Dongfang Boiler for the certification and exchange of boiler drum plates. In December of the same year, the product development was carried out. In May 2019, the national standard limit thickness for special container drums was completed. The 150mm 13MnNiMoR steel plate was developed, and the 13MnNiMoR evaluation technology agreement was signed with Dongfang Boiler and the evaluation test board was distributed. In August 2020, Dongfang Boiler Company completed the supply state of the test board, simulated thermal cycle state, and welding evaluation. The evaluation result of Dongfang Boiler is: “The 150mm 13MnNiMoR steel plate produced by Nanyang Hanye Special Steel meets the requirements of GB/T 713 for boiler and pressure vessel steel plate and Dongfang Boiler Enterprise Standard DG1806, and can be used for steam drum container manufacturing.”
According to the technical evaluation requirements, the difficulty of technology research and development is: simulating the thermal cycle process, which must be combined with the simplified thermal cycle process procedure of Dongfang Boiler Co., Ltd. for simulation evaluation. First, it needs to combine the pressing capacity of Dongfang Boiler’s equipment, so the high-temperature pressing temperature should not be low; second, Dongfang Boiler proposed that if the normalizing deformation process of the 150mm head plate adopts water cooling, it will increase the calibration cost, so the normalizing air cooling deformation technology should be adopted. ; Third, in order to reduce the cost of the process, the customer actively proposed to use the normalizing suppression process to replace the normalizing suppression + normalizing recovery performance process. In order to meet the various special technical needs of customers, it undoubtedly adds technical difficulties to ensuring good strength and toughness after thermal cycling. According to Dongfang Boiler, the 13MnNiMoR produced by a well-known domestic steel company has unstable impact toughness according to the simplified thermal cycling process. For this reason, Han Metallurgical Steel Research Institute has collected a large number of domestic and foreign technical data, compared with international advanced and mature steel companies, organized more than dozens of heat treatment simulation tests, and carried out comparative technical analysis and summary around the clock to optimize the best thermal cycle process. , Through unremitting efforts, finally meet the various special technical needs of Dongfang Boiler.
It is reported that 145mm is the current limit thickness of the plates used in the domestic pressure vessel steam drum industry, and it is a bright pearl product in the boiler vessel steam drum industry. Out of confidence in our own product technology and capabilities, our company directly assessed the national standard limit thickness and the maximum thickness of 150mm in the steam drum industry. Confidence comes from confidence, and confidence comes from unremitting efforts. In order to ensure that the test process is known and controllable, and the key progress is followed up on site, the Institute of Iron and Steel Research and the sales staff track the evaluation process throughout the whole process, and after unremitting efforts, the victory is finally achieved.
The certification of 13MnNiMoR for steam drum container steel with thickness of 150mm has written another page and new chapter of our company in the field of boiler and pressure vessel products, and can provide technical evaluation support for large domestic boiler plants such as Harbin Boiler and Shangguo. This breakthrough has further established the confidence of all employees in the development of the company. Under the leadership of the group company, the employees will work hard to move forward and create a new era belonging to Hanye Special Steel.