Such key control points of rolling as the chemical composition, heating process, finishing temperature, laying temperature, cooling and controlled cooling of hot rolled coiled reinforced bar with small specification are optimized as well as the mechanical properties, macroscopic metallographic structure and microstructure of reinforced bar before and after optimization are compared and analyzed. The results showed that the proportion of optimized Φ8 mm and Φ10 mm coiled reinforced bar with yield strength below 415 MPa significantly reduced, there were no obvious different contrasts for macroscopic metallographic structure as well as such abnormal microstructures as the tempered martensite and widmannstatten structure.

In the paper, the technical principle of desulfurization with ADA method and the main factors influencing desulfurization effect are introduced. The improvement measures are proposed by analyzing such problems in operating process of gas desulfurization system with ADA method in a Coking Plant as the lower pH value of desulfurizing liquid, high cumulant of secondary salt, desulfurizing liquid without foaming and easy blockage of sulfur melting device at sulfur discharge mouth. The content of H₂S in discharged gas is below design value and the gas desulfurization system runs stably with improvement so that the effects are satisfactory.

In this paper, the structure optimization process for water gun on top of blast furnace is mainly introduced. It could be manufactured with the existing materials by changing its original complex internal double-channel structure to the relatively simple water-gas joint-use channel so as to reduce the cost of spare parts, improve cooling effect, reduce production cost as well as ensure the safe and trouble-free operations of blast furnace.

In the paper, the types and structural characteristics of distributing chute in recent years are summarized by analyzing its current operating conditions in Baotou Steel. Moreover, such two aspects as its material and structure are studied and improved by analyzing its failure mode and causes so as to enhance its wear resistance at high temperature environment and further improve its on-line service life, which could meet the process requirements of blast furnace production.

In view of the problems that there is fracture on conducting rail of rail weigher body and anti crawling is inefficiency at the key position due to the influences of impact force and inertia moment of locomotive on the equipment set of rail weigher, such technical measures as improving foundation of anti-creep frame, optimizing bearing structure of cantilever beam, upgrading manufacturing material, changing fixing mode between anti-creep frame and foundation are adopted. As a result, the stability and bearing capacity of rail weigher are improved, data deviation caused by ineffective anti-creep is effectively reduced so as to ensure the accuracy of weighing data for rail weigher in operation.

In this paper, it is introduced the working principle of electromagnetic ultrasonic, thickness measure principle of electromagnetic ultrasonic detection and electromagnetic ultrasonic steel pipe testing as well as elaborated the application characteristics of electromagnetic ultrasonic detection process for seamless steel pipe from such aspects as multiform waveform and non-contact detection. The application effects of electromagnetic ultrasonic detection process for on-line quality control of product in steel pipe manufacturer are verified by the analysis combining with practical application situations of flaw detection equipment NORDINKRAFT based on the principle of electromagnetic ultrasonic used in Φ460 mm unit in Steel Tube Co. of Baotou Steel.

In this paper, it is compared and analyzed the design scheme for standard block at addendum of manufacturing enterprise A of measuring equipment from such two aspects as the measurement principle, method and basis of calibration as well as calibration reports of calibration organizations B and C. It is found that all the above manufacturing enterprise and calibration organizations of measuring equipment do not manufacture and calibrate measuring equipment completely according to standards as a result of bringing hidden danger for processing and measuring oil casing thread. Therefore, the optimal combination scheme for calibration slot of standard block is put forward so as to reduce the cost of measuring equipment and improve practicability. It is suggested that thread processing enterprises put forward clear calibration items and tolerance to calibration organization in calibration of measuring equipment to satisfy the standard requirements and improve product quality.

In this paper, it is analyzed the failures for unloading at high temperature of GK₁ type diesel locomotive as well as found out the causes for various failures of cooling systems at high and low temperatures, especially the rare failures of cooling system at low temperature. As a result, the solution of installing water temperature gauge and limnimeter in low temperature cooling system is put forward so that the efficiency of failure diagnosis is effectively improved and normal operation of diesel locomotive is ensured.

The traditional cost management mode cannot meet the requirements for fine management and control of production cost in iron and steel enterprise. In the paper, the daily costs of iron and steel enterprise are analyzed and studied by taking Baotou Steel as the background as well as the daily cost accounting system is proposed and completed. As a result, the real-time control on actual production status of production field and purpose of precision management of cost are fundamentally realized so that cost management is transformed from postmortem analysis to in-process control.

In the paper, the tests of dissolved filtration residue rate and detecting content of naphthalene are designed, key steps of detection are proposed through analyzing charateristics of tar as well as N, N-dimethylacetamide and tetrahydrofuran are determined to select as the solvent for dissolving tar. The temperature of chromatographic column adopts the programmed temperature method and quantification for components of sample is with external standard method.