In the paper, the experimental study on microstructure transformation of bainite steel with different contents of Mn and Cr using full automatic transformation measuring apparatus is introduced. The effects of different contents of Mn and Cr on transformation point of undercooled austenite are compared and analyzed as well as the effects of different transformation temperatures on microstructure transformation of bainite steel are also studied. The experimental results showed that the optimum temperature of microstructure transformation for bainite steel was 330 ℃, which provides theoretical basis for developing production process of bainite steel.

In the article, it is found that the decrease of pressure of chuck can effectively improve the stability of single value for thread by checking mechanical reasons and workpiece programme starting with solving the product quality problem causing unstable main single value for thread in production. The normal pressure of main chuck is 4 MPa, it is reduced to 2 MPa by using cooperatively commands M05 and M25 of workpiece programme. Practices proved that the unstable change for stand off and taper of coupling thread could be effectively avoided and waste products with ultra-poor single value could be reduced by reducing the pressure of chuck for coupling thread to contribute to cost reduction.

The ball mill is very important equipment in the process of grinding and classification in Baoshan Mining Co. as well as its energy consumption is the most in the whole plant. Its energy consumption generally accounts for 50%~70% of that of the whole plant. It is of great significance for saving energy consumption to use rolling bearing instead of sliding bearing on ball mill. At present, the five series of secondary mills are transformed and installed with two sets of rolling bearings as well as the operation effect is better so far. The comprehensive energy consumption saving is over 10%, annual electricity fee is saved by about RMB 0.44 million Yuan through comparing the electric current before and after transformation. Moreover, the roughness could be avoided and a lot of lubricating oil could be saved.

The traditional business model of mutual feeding in Baotou Steel is with such disadvantages as manual input, data verification is difficult and influencing financial cost accounting. In the paper, it is introduced that the management system for mutual feeding is designed aiming at the low efficiency of mutual feeding business combining with the traditional mutual feeding mode, which includes project context, process flow, system and key point design. The online verification of data as well as real-time refreshing, inquiry and statistics of statement are completed by automatically collecting business data so that the synergy of business flow and data flow is realized.

In the paper, the method for analyzing titanium, arsenic and tin in cast iron with X-ray fluorescence spectrometer is discussed. With such condition experiments as sample preparation, selection of abrasive grain and drawing of working curve, the detection method determined is with simple operation and the results are reliable, which could meet the requirements for on-site rapid analysis of titanium, arsenic and tin in cast iron as well as provide technical guarantee for providing high-quality molten iron for manufacturing test steel.

In this experiment, the mercuric thiocyanate ethanol solution is as color-substrate solution and the chlorine ion content in organic amine is determined with spectrophotometry at the wave length of 460 nm. Such conditions as the amount of chromogenic agent, chromogenic time and amount of acid added are optimized by the experiment as well as the elimination test of interfering ion is carried out. The detection limit of this method is 0.034 2 μg/mL, adding standard recovery is 93.10%~104.60% and RSD≤1.75%. The method is fast, accurate as well as with high sensitivity and precision, which is suitable for determining the chloride ion content in organic amine.

In the process of magnetic separation of steel slag, the particle size and water content all change. The water content of steel slag is low, so it is easy to raise dust. In this paper, the economical and environment-friendly as well as practical and effective measures for dust suppression are formulated by analyzing the problem, reason of raising dust for magnetic separation processing line and on-site materials combining with on-site environmental monitoring data. The overall dust suppression efficiency could reach over 92% when water content of steel slag is increased to about 20% by reasonably setting fog-spray nozzle. The systemic application of wet process operation method could effectively solve the problem of raising dust in the process of magnetic separation of steel slag.

In this paper, it is introduced the feasibility test of adding new-type binder instead of bentonite is carried out aiming at the production situation of high content of SiO₂ in pellet due to the high proportion of bentonite for pellet with belt type roasting machine. The results showed that the grade of pellet increased by 0.45 percentage points and the content of SiO₂ reduced by 0.60 percentage points after use new-type binder instead of bentonite so that the pellet could better meet the smelting demands of blast furnace.

The composition of desulfurizing waste liquid is stable, it is with toxicity and corrosivity as well as its treatment is so difficult that it belongs to the industry problem. In this paper, it is discussed the generation, characteristics and harms of secondary salt for desulfurizing liquid as well as the main treating methods for desulfurizing liquid currently used in the coking industry. Moreover, it is briefly analyzed such processes as the coal blending, salt extraction and acid manufacture.

In this paper, the successful tapping of 7^# blast furnace of Baotou Steel after long-term blowing down is mainly summarized. It is the first time to use the "embedded observable oxygen lance technology before reblowing of blast furnace" and a set of methods are summarized by taking such measures as the scheme formulation before blowing down, previous preparation and rational use of oxygen lance to guarantee the successful tapping of blast furnace after long-term blowing down, which lays a foundation for rapid recovery of furnace condition.