Lean management is the internal requirement of high-quality transformation and development, and it is also an effective means to enhance the competitiveness of enterprises. Hebei Xinda Iron and Steel Group Co., Ltd. under the leadership of Ren Haibing as the core of the steel plant, the use of lean thinking, focus on task promotion, through a series of lean management measures, the first three quarters of 2024, the average cost reduction of all steel grades is 4.37 yuan/ton, to ensure the completion of indicators optimization and efficiency improvement tasks.

Fine process control

Practice Lean "winning chess"

Steel mills focus on the key, clear responsibility to grasp the main body, according to the heat balance reasonable slag material, stable operation, control spatter, silicon high manganese blast furnace reasonable use of double slag operation, to avoid large spatter. Strengthen the communication between sections, control the temperature reasonably according to the time of pressing steel, control the pouring of large and medium ladle, divide the pouring stop and block the flow of the billet, reduce the cutting head and tail of the casting billet. Formulate plans to improve the converter one-down rate and carbon temperature hit rate, refine rewards and punishments, and improve the awareness of personnel in key positions of the converter.

At the same time, focusing on the factors affecting the consumption of iron and steel materials and iron-containing materials, break the whole into pieces and break them one by one. In the furnace where the temperature is high, the cold material such as steel bar cutting is used to adjust the temperature after the furnace to reduce the temperature of nitrogen in the furnace and improve the metal recovery rate. Increase the recovery of self-circulating slag steel, steel slag transport and screening. The continuous casting platform uses a special slag basin to collect all kinds of scrap steel and directly recycle it to the scrap bucket of the slag room.

Optimize production process

Make lean "key moves"

Combined with the test data of the quality measurement department, the steel mill tracks the product performance and controls the steel grade composition. Discuss Q195 aluminum block alternative with technical department and Quality Measurement Department, reduce deoxidation cost, and track the subsequent rolling situation and quality feedback. Through professional training, improve the level of component control, ensure the qualified rate of finished internal control components, and the normal furnace control range is within the internal control line.

Lean management is not a matter of overnight, steel plants standardize the converter steel alloy structure and the use of deoxidizer, in strict accordance with the operation points or technical requirements, strengthen the operation of steel, pay attention to the alloy, carburizing auxiliary materials, do a good job in slag operation, to save alloy, carburizing auxiliary materials to create good conditions. Pay close attention to the composition temperature of molten iron in the furnace, adjust the amount of scrap steel, prevent the phenomenon of low temperature after blowing, affecting the absorption rate of alloy and carburized auxiliary materials. Strengthen the operation of converter, increase the end point C content, reduce the oxidation of molten steel.

Enhanced equipment operation

Play a lean strategy to save energy

Steel mills strictly strengthen lean management, strengthen fine operation, further control energy consumption, and significantly improve energy efficiency. In terms of power consumption, pay attention to the peak-valley flat price, such as the production preparation section to make full use of the peak-valley flat price, and fill the silo during the valley period. Control the use of air conditioning in the high voltage distribution room, and gradually switch all lights to LED lights to eliminate idling during maintenance.

In terms of blast furnace gas consumption, the number of online ladle baking should be reduced under the premise of meeting the production requirements. In terms of nitrogen consumption, prepare the nitrogen sealing system transformation in advance. In the furnace with a large amount of slag, under the premise of ensuring the requirements of furnace protection, part of the slag should be poured out before splashing, so as to shorten the splashing time and reduce nitrogen consumption.

What is done is done, and what is done is done. Hebei Xinda Iron and Steel Group Co., Ltd. will always adhere to the problem-oriented, goal oriented, result-oriented, lean as the main line to stimulate the lean vitality of all employees, from the strengthening of production organization, detailed intelligent control, optimization of quality system and other aspects, continue to make up for weaknesses, strong and weak, adhere to management innovation to drive comprehensive innovation. Deepen reform, actively seek change, integrate lean management thinking into the whole process of production and operation management, the whole chain, and various fields, unswervingly carry the red flag, walk in the front, strive for the first, lean management as a new quality productivity, and strive for high-quality development of enterprises!