As early as 2008, China Steel Luonai actively explored the business of blast furnace tapping trenches. The casting materials and construction of 450m ³ and 630m ³ small blast furnace tapping trenches became the "pioneer" of China Steel Luonai in blast furnace tapping trench business. With the continuous expansion of large steel mills' blast furnaces, the performance requirements for the pouring materials in the blast furnace's iron trough have also risen. How to carry out general contracting services for related businesses has become a difficult problem that restricts the company's development. Without experience in general contracting of large blast furnaces and insufficient knowledge reserves of relevant technical personnel, the company's scale of blast furnace tapping groove business has always been hovering around small and medium-sized enterprises, and blast furnace tapping groove business exceeding 2000m ³ is considered rare.

In October 2023, Wuhan Refractory was entrusted by China Steel Lonai to manage, and since then, the two parties have become "one family". Wuhan Refractory's rich experience in steel general contracting services is like a "catalyst", accelerating the transformation of China Steel Lonai into the steel business.

In January 2024, Wuhan Refractory won the bid for the overall contracting of 3200m ³ blast furnace slag iron ditch refractory materials for a certain steel plant. Under the guidance of business collaboration and cohesion, Wuhan Refractory closely cooperated with the Luoxin base and marketing center to jointly carry out the business, supply, construction, and maintenance of refractory materials for two iron chutes. A 3200m ³ medium to large blast furnace has high temperature, high air pressure, and high smelting intensity inside the furnace. The molten iron flowing out of the blast furnace has a high flow rate, large erosion, and intense chemical reactions, which require higher performance requirements for the castables used in the tapping groove. In order to vigorously expand the consumption of steel refractory materials, Sinosteel Luonai has taken the blast furnace tapping groove business as a breakthrough point, continuously improving the tapping groove castable that has been developed for more than ten years. After countless experiments and adjustments, it has successfully developed a series of micro porous high-strength and corrosion-resistant tapping groove castables. This type of castable has a high temperature bending strength twice that of traditional tapping groove castables, and has significant advantages such as strong mechanical erosion resistance and fast drying, greatly extending the service life of tapping grooves and providing solid support for the key production process of blast furnace tapping.

Relying on the high-performance castables and lean construction services of the Luoxin base, the 3200m ³ blast furnace using Sinosteel Luonai microporous high-strength and corrosion-resistant iron groove castables began to produce iron on February 17, 2024, and was offline on March 18. Throughout the entire usage process, there was no need for intermediate repairs, and it was continuously used for 30 days. The maximum amount of iron per groove reached 137200 tons, far exceeding the contractually agreed 120000 tons, creating a new high in the factory's single communication iron volume. Compared with the previous manufacturer's material used by the owner, the usage days increased by about a week, and the residual thickness of the main groove refractory material offline was still around 350mm, which not only greatly improved the service life, but also ensured the operation of the iron groove. Smooth and stable. In terms of construction and maintenance, Sinosteel Luonai also strives for excellence. Construction service personnel are on duty 24 hours a day to ensure that any problems that arise during the iron tapping process in the iron ditch can be responded to and dealt with promptly. Good product performance is the most powerful promotion, and high recognition and positive feedback from customers are the greatest praise. Due to the excellent performance of the products on site in the first contract, all 10 iron trench businesses of the 3700m ³ blast furnace (4, 2, 2 in succession) at the same steel plant were handed over to China Steel Luonai. As of now, all 10 blast furnace iron gutters of the steel plant have been put into stable service, achieving a new breakthrough in the successful application of the series of castables used by China Steel Luoyang Iron Ditch in large blast furnaces, and taking solid steps towards the development of steel consumable refractory materials.