In this article, it is introduced the basic principles and structure of the numerical controlled flame cutting machine as well as mainly analyzed the automatic height adjusting system. This control system is essentially a system of random position and composed of three feedback control loops. The inner loop is negative feedback of current cut-off, the middle loop is voltage feedback and the outer loop is position feedback. The distance between cutting torch of cutting machine and steel plate to be processed is smoothly ensured to be a constant with the system so that the cutting quality is improved and the scrap is reduced.

In the paper, it is described such problems as uneven burning in heating furnace of hot rolling, serious burning loss of oxidation, great energy consumption as well as dangerous and bad working environment of staffs are solved based on the existing first-level automation equipment and new computer technology applied in the automatic control system of heating furnace aiming at the annual output of 5.5 million tons of hot-rolled coils as well as the changing demands of steel grades, specifications and temperatures for slab with the hot rolling 2 250 mm production line. The reasonable heating of slab in heating furnace and real-time locating and tracking control are realized through the automatic combustion model and feedforward control of temperature.

A large blast furnace needs an overhaul to recover its performances within a generation of furnace life (about 10 years). During this period, several item repairs or medium repairs are needed to eliminate the defects and hidden dangers to ensure the stable and high yield of blast furnace. It is an important part of overhaul or medium repair to replace all or part of the furnace shell. The burn-through furnace shell might be with damping down for rush repair under special circumstances. In this paper, it is mainly introduced how to complete the proceeding tasks fast and efficiently as well as the technical essentials of replacing furnace shell in item repairs and medium repairs so as to achieve the standardized operations.

The protective shed at bottom floss hole of flue collector is one of the necessary safety technical measures in the construction of medium repair of converter. In this paper, such series of process as its functional orientation, design of structural style, modeling of wear-stress as well as analysis and checking calculation is discussed in detail. The purpose is to make its carrying capacity visual and quantitative as well as easy to be mastered for operators so as to create an example of standardized operations for the similar projects in future, which is of great significance for improving the operating efficiency of converter in medium repair and the level of safety protection.

In this paper, it is introduced the classification, mechanism and characteristics of film formation for polyurethane waterproof paint, analyzed such problems as precipitation, film formation, air pockets caused by bad bond with base it and the paint is too thick in the applications of polyurethane waterproof paint as well as proposed the corresponding preventive measures. Moreover, its applications in such fields as civil architecture, subway, railway bridge, water conservancy and hydropower engineering are elaborated. It is pointed out that it must be developed in the direction of green environmental protection, high performance and multifunction in the future.

The enterprise resource planning (ERP) is an advanced information management mode widely applied in modern large manufacturing enterprises. Its functions cover the whole process of productions and operations in enterprises including such as the production planning management, purchasing management, inventory management, cost control, financial management, human resources management and quality management. The cost management system as the primary subsystem of ERP project of Baotou Steel, its purposes are to establish a perfect cost collection system through such related subsystems as the production and marketing, quality, equipment, purchase and salary of ERP system. The objects of cost accounting are refined by the activity-based costing so as to realize the various targets of cost control of Baotou Steel.

The safe early warning index system is a highly integrated information analysis system. In the paper, its functions, framework and application modes are analyzed and explained. Such functions as summarizing, analyzing, early warning and issuing the information data of safe production online are realized through establishing and applying the system in safety management so that the ability of controlling accident risks and occupational hazards for enterprises are improved.

The rare earths are important elements for improving the properties of iron and steel material. In recent years, there are some important progresses for the researches of electrical steel containing the rare earth. In this paper, the functions and research progresses of rare earth in electrical steel are discussed. The influencing rules of rare earth on inclusions, texture, microstructure and properties of non-oriented silicon steel and oriented silicon steel are summarized respectively. It is one of the important ways to add rare earth into electrical steel for improving its performances, which is the important direction of the development of electrical steel in the future.

The whole process from the occurrence of cracks to slumping of 4^# slip mass in 1 626 m south D area of main stope of Bayan Obo Iron Mine was monitored. The formation mechanism and evolving regularity were analyzed and summarized so that the slumping time was predicted timely and accurately. As a result, the safe production around and at lower step was effectively guided, the damages of equipment and personnel when slip mass caving were avoided and the effective treatment scheme after slumping was put forward simultaneously, which were with significant meanings to the side slope management of the mine.

Bayan Obo ore deposit is an ultra large multi-metal ore deposit with such as Fe, rare earth and Nb. In recent years, the deep prospection has been carried out in the main east mine and the deepest drill hole designed is up to 1 700 m. Part of stratum (especially the part of ore reception and removal) is with such complicated features as fragmentation, leakage, collapse and chip off-falling. In order to avoid such accidents as sticking of tool, tools truck or obsolescence of drill hole caused by instability of drill hole, the low (no) solid drilling mud, anti-deflection drill + anti-deflection technology with packed hole assembly and the relative technical measures are applied so that the drilling is smooth, the construction quality and efficiency are good, which could provide the technical assurance measures and experiences for the construction of main mine in future.