In this paper, based on the chemical composition of U75V rail, the rare earth element Ce with contents of 0%, 0.002%, 0.004%, 0.006 and 0.008% was added into the rail respectively as well as the samples were prepared by such process as smelting in 25 kg induction furnace, ingot casting and rolling to explore the influences of Ce on the microstructure and corrosion performance of rail steel. In this experiment, the pearlite lamellar spacing of rail steel is affected by adding Ce element. With the addition of Ce element, the pearlite lamellar spacing is first decreased and then increased as well as reaches the minimum when adding 0.004% Ce and the corrosion resistance is also the best.

In the paper, it is introduced the principle analysis for the main parts of machine tool influencing the single values for finished products of Colinet coupling threading machine of Steel Tube Co. of Baotou Steel and the countermeasures are formulated one by one, with which not only the problem that unstable single values for finished products of Colinet coupling threading machine is solved, but also the reference theoretical basis of repairing machine tool is provided for maintenance personnel so that the quality of products is ensured as well as the costs are reduced and the efficiency is increased.

The Ce-Fe alloy is added at the stage of RH in the process of smelting IF steel to improve the overall performances of automobile sheet steel through industrial tests. The industrial sampling was carried out for the test results so that the type, size and microstructure of rare earth inclusions in the entire process of smelting were systematically analyzed with the SEM-EDS electron microscope, ASPEX automatic scanning of inclusions, X-ray diffraction(XRD) and thermodynamic calculation. The results showed that such inclusions as Al₂O₃ and MnS could be modified with rare earth Ce from RH to slab and rolled products so that such rare earth inclusions as Ce₂O₃, Ce₂O₂S and CeO₂ were preferentially formed, rare earth inclusions were gradually transformed from Al-O-Ce to such inclusions as Al-O-Ce, Ce-O-S and Al-O-Ce-S as well as the shape tended to be spherical and ellipsoidal and the size was below 5 μm.

In the paper, it is introduced the reasonable control mode is chosen and corresponding preventive measures are taken due to the smudginess of engine oil for diesel locomotive affects the reliability of locomotive operation. In order to prevent the pollution to oil system caused by engine oil without filtering entering diesel engine, it is necessary to make a sleeve with ring edge and install it on front cover of filter with the mounting hole on ring edge as well as two O-ring recesses are processed on the excircle of upper base of filter element to form effective sealing between the O-ring and front cover of filter. As a result, the working reliability and performances of diesel engine are improved as well as the service life of components and diesel engine is prolonged.

In the paper, it is studied the mechanical properties and corrosion resistance of weather-resistant ribbed bar, influences of rare earth on corrosion resistance, composition of rust layer and determination of CCT curve for test steel in the laboratory. The trial production of rare earth weather-resistant ribbed bar with the characteristics of Baotou Steel by 6^# casting machine and billet process has been successful. Its test results such as the slab quality, mechanical properties and bending of products could meet the requirements of corrosion-resistant ribbed bar standard.

In this article, the working principle, equipment structure, control methods and technical parameters of high pressure water descaling system in 2 250 mm hot rolling production line of Rare Earth Steel Plate Plant of Baotou Steel are introduced. In order to produce the hot-rolled coil with higher surface quality for the plant, the key equipment of the system should be used scientifically and reasonably.

In the paper, it is introduced the types and change rules of stable compound after add Ce into the liquid steel are obtained by comparing the absolute values of gibbs free energy for the standard production of Ce and its compounds in liquid steel; it is elaborated the changing situations of rare earth content in liquid steel as well as its effect on w [S] in liquid steel and cleanliness of liquid steel for the heats without adding rare earth and with adding rare earth Ce when producing rare earth steel with the KR + BOF + LF + RH + CCM process route.

The main power equipment of combined cycle power plant in metallurgical enterprises is the gas turbine, which can burn the blast furnace gas with low heating value. In this paper, the applications and development of gas-steam integral unit are considered to be necessary in metallurgical enterprises through introducing the applications, advantages and characteristics of combined cycle power plant, analyzing its development trend as well as the economic and social benefits of using the gas surplus in metallurgical enterprises.

The sewage transformation project is a water-saving transformation project for subsidiary of a northern iron and steel enterprise, which is a practical project that could improve efficiency and seek development for iron and steel enterprises as well as it is with the significant economic, social and environmental benefits of water saving. In the paper, the economic benefits of water saving are evaluated with benefit-cost analysis on the basis of calculating the amount of saving water and water discharge; the environmental benefits are evaluated combining the quantitative method and qualitative method; the social benefits are assessed with the qualitative analysis. Finally, the conventional methods suitable for iron and steel enterprises to evaluate water saving projects are summarized.

In the process of casting rare earth steel, the rare earth oxides enter the melting layer of casting powder, which affects and limits the normal play for metallurgical properties of casting powder. In the paper, the effects of rare earth oxides on melting temperature, viscosity and crystallization temperature of mould flux with different basicities are systematically analyzed aiming at the problem. The results showed that a small amount of rare earth oxides could facilitate the melting of casting powder as well as the melting temperature, viscosity and crystallization temperature of casting powder with different basicities were changed significantly with the increase of rare earth oxides content.