Recently, a piece of good news came from the 2250 Hot Strip Mill of Valin LY Iron and Steel. By April 7, the heat treatment line in the mill has completed the production orders of the4mmwear-resistant steel and delivered to its customers. Prior to this, the quenching board of this gauge has been in supplies of small batches. This order was the company’s first batch supply of the4mmwear-resistant steel.
4mm is the lower limit size for the quenching of high-strength low-alloy steel. The quenching process requires harsh precision in terms of equipment and technology. Shape control technology in quenching has been recognized as an international problem.
This year, with the expanding demand for thin gauge steel of customers, the earlier plate, which was in stable supply, was unable to meet their needs. To meet the new requirements of customers, 2250 Hot Rolling Mill actively cooperated with relevant departments and adopted new debugging process and tackled the problems concerning plate shape. In the process of optimization, technical personnel tracked the whole process, from the first cross-decoiled slab to the last piece of the slab into the furnace. Compared with the shape before debugging, the new process has reduced its waviness down by 3-10mm, creating favorable conditions for the subsequent straightening process. (Liu Zhi)
From: China Steel News