The traditional manual accounting mode has been adopted in the point inspection work of Steel Tube Co. for a long time. Based on this, the R&D for intelligent information point inspection platform has been put forward by Steel Tube Co.. The overall goals are to promote enterprise management innovation, optimize management mode, implement business process reengineering and establish a modern equipment operation management system by means of the advanced information technology with informatization so that the equipment operations are transmitted timely and accurately through the network as well as duplicate entry of the same data source is reduced. As a result, the equipment operation data are accurate, timely and sharable.

In this paper, the uncertainties for yield strength R_t0.5, tensile strength R_m and elongation after fracture A₅0 mm of L80-1 pipe with specification of Φ114. 3 mm × 7. 37 mm manufactured by a Tube Co. are evaluated. The expanded uncertainties of each detected value are U (R_t0.5)=20 N/mm², U (R_m)=5 N/mm², U (A)=0.8% as well as their relative expanded uncertainties are U_rel (R_t0.5)=3%, U_rel (R_m)=1%, U_rel (A)=3%, which are obtained through establishing model, analyzing sources of uncertainties, evaluating each component and calculating combined standard uncertainties.

The stress concentration is generated in the processes of cooling, stretching and straightening for continuous casting tube bloom with large diameter as well as the stress cracks are formed on the interior and surface of continuous casting tube bloom when the stress is too large. In this paper, it is analyzed their causes and mechanisms as well as summarized the types of defects for steel pipe caused by them in the process of hot rolling seamless steel tubes. Moreover, the guiding suggestions for controlling and solving stress cracks of continuous casting tube bloom and defects of seamless steel pipe are proposed by analyzing their relevance, which conduce to controlling the related elements pointedly in practices and reduce the defects in the process of rolling seamless steel pipe.

The servo valve is the core control element of hydraulic cylinder control system (HCCS), the computer system implemented the closed-loop control is the main control mechanism of HCCS and the D791 servo valve itself used for rolling mill is the control valve with closed-loop control. In the paper, the working principles of MOOG D791 servo valve are introduced as well as the control characteristics of its flow and its dynamic properties are analyzed. The feedback signals of spool displacement for servo valve could be seen with the simulated program as well as the superiority and inferiority for its working performances could be judged through the following features curve of feedback values and set values in the whole motion process of servo valve.

The tensile to failure experiment was carried out with the sleeve joint of API round thread and the tensile load did not reach the minimum connection strength so that the joints slipped. In the paper, the effects of changes of outer diameter, wall thickness and inner diameter of steel tube as well as taper of thread on connection strength of joints were compared with the finite element method. The calculation results showed that the effects of geometric parameters of steel tube were greater and the control principle for geometric parameters of plain-end tube for processing round thread was put forward.

The iron ore deposit is divided into east and west ore blocks. The east ore block is composed of five ore bodies controlled by the 42 and 46 lines and the west ore block is composed of two ore bodies controlled by the 30 line. They are over 800 m apart and connected with convergent and narrow skarn zone in the middle. There are seven ore bodies in total and their common features are that they are stratiform-like or stratiform, north-dipping, the upper dip angle is gentler and the lower one is slightly steeper, the upper part is thinner and the lower part is thicker gradually as well as there is a tendency to expand and extend to the deep. The graphite deposits are distributed between the 38~50 lines, forming a total of 8 ore bodies. According to the mineral combination and metamorphic grade of ore-controlling rocks, the deposit is considered to be a regional sedimentary metamorphic deposit.

In this paper, the production practices for improving stability ratio of furnace temperature for 4^# blast furnace of Baotou Steel are summarized. It is greatly improved by strengthening the management of crude fuels, adjusting the charging system, exploring appropriate thermal system, strengthening the operations for stability of slag crust of copper cooling wall as well as implementing the standard operations and daily examination system of blast furnace, which lay a foundation for stable and trouble-free operations of blast furnace.

In this paper, the factors affecting the w [S] in pig iron are analyzed and discussed by referring to the corresponding relationship between main production parameters and w [S] in pig iron. The results showed that damping down has effects on w [S] in hot metal, but not obvious; the effects of sulphur load on quality of hot metal are obvious and their corresponding relationship is good, therefore, it is significant to reduce the sulphur load in furnace for improving the quality of pig iron; stable furnace temperature is the premise for stabilizing the quality of hot metal; in order to improve the quality of hot metal, the basicity of slag must be increased and stable; when the utilization ratio of gas was stable, it is beneficial to desulfurization of hot metal.

Since the demand of high-grade fasteners in the fastener industry is increased year by year, the ML35CrMo alloying cold heading steel wire rod is developed. In this paper, it is introduced the non-metallic inclusions, mechanical properties, cold heading and rockwell hardness of quenched and tempered finished wire rod could all meet the standard requirements through controlling such processes as converter smelting, refining, continuous casting and rolling for ML35CrMo cold heading steel as well as selecting heat treatment system for wire rod.

In this paper, it is introduced the working principle and advantages of oil-gas lubrication as well as analyzed the exsiting problems in the applications of oil-gas lubrication system of withdrawal straightener of 6^# continuous casting machine. Moreover, the improvement measures are put forward and applied successfully.