Recently, Baotou Steel Special Steel Pipe Co., Ltd. successfully developed and stably produced by using hot rolling process Φ 30 tons of 38 * 3.5mm seamless steel pipe indicates that the product group distance of the company has expanded from 48mm-114mm to 38mm-114mm, further expanding the product structure and improving the competitiveness of the industry.

Φ 38 * 3.5mm seamless steel pipe generally adopts cold drawing production process, which has low production efficiency and high cost; And the company directly adopts Φ The hot rolling forming of 150mm continuous casting slab not only improves the efficiency, but also effectively reduces the cost.

The initial outline of the product of this specification is provided by Φ 90mm round billet rolling. If used Φ The production of 90mm round billet will cause a loss of 20.2% per hour. In order to reduce the loss of output and reduce the cost investment of large thermal tools, Baotou Steel Special Steel Pipe Co., Ltd. made bold innovation and set up a special R & D team Φ Direct rolling of 150mm billet. The core process difficulty is the redistribution of deformation. The outer diameter of continuous rolling is reduced by 11.1% and the absolute reduction is increased by 10mm. Based on the experience of continuous rolling pass design of Baotou Steel Pipe Co., Ltd., the R & D team integrated the relevant precedents of the industry, adopted the air reducing mode, independently modified the original continuous rolling digital model, and repeatedly verified the deformation process parameters of each unit. The trial production is successful through one-time heat load on site. After inspection, the geometric dimension and surface quality of the product fully meet the standard requirements.

The trial production was successfully carried out by adopting the hot rolling empty reducing mode Φ The innovative process of 38 * 3.5mm seamless steel pipe is unique in China, which accumulates valuable experience for the pass design of the company and helps the development of high quality.