The 800 MPa grade hydropower engineering steel with low welding crack sensibility is developed through smelting test steel with 100 kg vacuum induction furnace as well as thermal mechanical control processing (TMCP), quenching and tempering processes adopting the alloy system route of low carbon, carbon equivalent (Ceq) and welding crack sensibility index (Pcm) in laboratory. Such mechanical properties as the strength, impact and bending of test steel are tested as well as its microstructure and fracture morphology are analyzed with the optical microscope (OM) and field emission scanning electron microscope (SEM). The results showed that its microstructure at room temperature was tempered sorbite, all its mechanical properties were excellent, its yield strength, tensile strength and elongation after fracture were 788 MPa, 842 MPa and 18.1%, low temperature impact absorbing energy at -40 ℃ was 197 J, strength and toughness well matched as well as welding crack sensitivity index was low, which could meet the performance requirements in use.

The design of power supply system in workshop needs to consider such factors as the reliable power supply, economic rationality, advanced technology and future development. In this paper, such aspects as the design principles and thoughts of high and low voltage power supply systems in steelmaking workshop of a converter project are discussed. The high voltage power supply system is elaborated mainly from such aspects as power distribution system and relay protection as well as the low voltage power supply system is elaborated mainly from such aspects as the system partitioning, power distribution system, safe power supply and security measures.

The coiler in production line of hot continuous rolled strip steel is the only equipment for coiling strip steel after rolling and its stability of working condition directly affects the stable production of production line, yield and appearance quality of coil of strip. The level of stiffness of wrapper roller for coiler is the core factor determining stability of coiler. In the paper, the concept of stiffness of wrapper roller for coiler in production line of hot continuous rolled strip steel as well as the significances and methods of static test are elaborated. The analysis sheet of stiffness of wrapper roller is obtained through tests as well as collecting, analyzing, summarizing and calculating related data. Guide the craft personnel to set and optimize parameters as well as equipment personnel to eliminate defects purposefully to ensure stable operation of coiler, reduce coiling accidents and improve yield as well as ensure coil shape and appearance quality of strip steel.

The waste emulsion is the oily wastewater in high concentration discharged in steel rolling process and the key of treatment is demulsification. In this paper, the suitable demulsification methods are selected through experimental study as well as the experimental conditions of electrooxidation demulsification and chemical flocculation demulsification are selected. The results showed that the most suitable demulsification method was electrooxidation, its optimum current range was 2.0~3.8 A and optimum voltage range was 140~200 V; the optimum coagulant for chemical flocculation demulsification was polyaluminum chloride. When the quantity added to is 1.5 g/L and pH value is adjusted to 7~9, the chemical oxygen demand (COD) in waste emulsion reduces to less than 8 000 mg/L, oil content reduces to less than 1 000 mg/L and suspended solids reduces to less than 1 500 mg/L.

In this paper, a new-type accurate online measurement system of quantity of dry ore in pulp pipeline is introduced. The system is with the diaphragm pump as pulp conveying power and measuring equipment of pulp volume, pulp density is measured with γ-densitometer and grade of iron concentrate is with manual measurement, quantities of dry ore and backwater in pulp are calculated accurately with mathematical model; various data are processed automatically with information technology and results are published through the server of settlement report. Meanwhile, an automatic online calibration system is designed and manufactured to calibrate the calculated values regularly.

The circle shear is one of the key equipment in production of cold rolling strip, which is mainly used for cutting to length and trimming of strip. In the paper, the structure and principle of equipment for trimming operation of cold rolling strip is analyzed as well as the relation among use and calibration of shear edge for circle shear, process parameter adjustment and quality of trimming is analyzed and improved by taking the circle shear of cold-rolled steel pickling crew in Inner Mongolia Baotou Steel Rare Earth Steel Plate Co., Ltd. as research object so that the stability of circle shear is improved, probability of trimming defect is reduced and quality of trimming for finished strip steel is improved effectively.

In the paper, it is introduced the supermatic and informationized solution of intelligent unmanned warehouse with collaborative operation of various unmanned equipment such as crane and ground equipment, intelligent scheduling, intelligent storage location recommendation and trace of the entire process of materials is established aiming at how to effectively improve warehouse management and reduce warehouse cost by exploring the establishment of intelligent unmanned warehouse, analyzing such links of the whole process of warehouse as inbound of coils, swing, classified storage and delivery of cargo from storage as well as taking the new technology of unmanned and automatic equipment as supporting point, informationized and intelligent decision making of warehouse management system as support.

The manganese content of molten iron in the production line of steelmaking in Rare Earth Steel Plate Co. is higher so that the highly purified armco iron could not be smelted by converter process. In the paper, it is introduced the demanganization process with double slag in LF is developed through simulating the demanganization condition of converter with LF, starting with such three aspects as basicity of slag, demanganization temperature and oxidability of slag as well as taking full advantage of existing equipment conditions of production line. The slag with high oxidation after tapping of molten steel from converter is utilized in LF, the ingredient of LF clinker is reasonably adjusted to produce efficient slag of demanganization and promote the steel slag reaction through argon stirring so as to create good thermodynamic and dynamical conditions for demanganization. According to the requirements of manganese content of products, double slag and single slag processes are applied in operations to realize the stable batch production of armco iron with the manganese content less than 0.03% and 0.02%.

In the paper, it is elaborated such faults and problems of axial plunger pump with the existing working condition of hydraulic system in Inner Mongolia Baotou Steel Rare Earth Steel Plate Co., Ltd. as overheating of pump body, sealing failure, system pollution, noises and insufficient flow caused by damage of parts, oil pollution, leakage, friction losses and assembly accuracy. Moreover, their inducements and characteristics are analyzed aiming at the generation of faults as well as damage and operation condition of inner components, quality and cleanliness of oil, system leakage and temperature are checked so as to make effective fault diagnosis for hydraulic system as well as ensure the stable operations of axial plunger pump and hydraulic system.

In this paper, it is systematacially introduced the background, specific implementation process and achievement for the integrated management mode of production, marketing, research and development and forwarding in Rare Earth Steel Plate Co. as well as comprehensively summarized the important measures in operation process. The exploration and practices on the management mode promote the performance of production and management and management level of enterprise to be improved as well as provide the references for propelling the reform of management mechanism and improving the management efficiency of other enterprises in the iron and steel industry.