In order to study the high temperature deformation behavior of T91 steel containing 0.016% rare earth Ce, the thermal shrinkage test was carried out with the Gleeble-1500D thermal simulator. Its stress-strain curves were measured when the deformation temperature T was 1 100~1 250 ℃ and the strain rate was 0.5~5.0 s^-1. The constitutive equation of high temperature plastic deformation was constructed with the Zener-Hollomon parametric method, the energy dissipation diagram was calculated and the high temperature deformed microstructure was studied with optical microscope. The results showed that the stress-strain curves of T91 steel with rare earth Ce were without characteristics of double peaks and there was dynamic recrystallization; the hot deformation activation energy calculated by flow stress model was 559. 46 kJ·mol^-1, which indicated that the addition of rare earth Ce increased the hot deformation activation energy of T91 steel; rare earth Ce delayed the dynamic recrystallization process of T91 steel combining with the energy loss diagram and microstructure as well as dynamic recrystallization was easy to occur at high temperature and low strain rate.

The pier terminal is a common configuration of airport terminal, the fusiform steel roof is used for the airside concourse of newly built Terminal 3 of Yinchuan Hedong International Airport, which is with attractive appearance so that the perfect combination of reasonable structural form and architectural image is realized. In this paper, it is mainly introduced the processing and manufacturing technologies of multi-branch fusiform beam on the roof of airside concourse of the project.

The stepping billet shifer for feeding and blanking of NK flaw detector is improved on the basis of various traditional billet shifers and its own characteristics are formed using their advantages for reference. In this paper, it is briefly introduced its structure, working process and advantages, sketched the schematic block diagram for its motion principle as well as verified and analyzed its main parts so that the rationality of using it is verified.

The industrial production of non-oriented electrical steel 50W600 with rare earth is with the CSP production line. The microstructure, inclusions and texture of casting blank, hot rolled plate and finished plate were studied with such equipment as the transmission electron microscope, scanning electron microscope and X-ray diffraction (XRD). The main results were as follows: the development of columnar crystal for casting blank was suppressed obviously, space between dendritic crystal was decreased, ratio of equiaxed crystal was increased and banded structure of hot rolled plate was improved; the function of purifying liquid steel with rare earth was so obvious that the precipitation of MnS was reduced and precipitation of part of AlN was transformed from nubby and elemental to spherical and compound; the average grain size was increased, the favorable textures (100) and (110) were increased as well as the unfavorable texture (111) was reduced after annealing; the average iron loss was reduced by 0.4 W/kg and average magnetic induction intensity was increased by 0.011 T for finished products.

In the paper, it is analyzed the damages of compensator in warm-air pipe system and their causes since the 7^# and 8^# blast furnaces of Baotou Steel were put into operation as well as proposed the design scheme of incresing the large pull rod of warm-air branch pipe. The pull rod is with four sticks of solid round steel with Φ150 mm and installed to warm－air branch pipe with sectional type in order to prolong the service life of ripple compensator in warm-air pipe system.

The two methods for measuring magnetic properties of non-oriented electrical steel include the Epstein frame method and uniwafer method. In the paper, it is introduced their equipment, sampling method, specimen size, amount and detection method as well as mianly analyzed the testing data results measured with them. The results showed that the range value and standard deviation of iron loss and magnetic polarization intensity measured with the Epstein frame method were all smaller and more accurate than those measured with uniwafer method, however, the sample size is large and requirements of specimen size are strict with the Epstein frame method, while the sample size is small and deviation is within permissible range with the uniwafer method, so the uniwafer method could replace the Epstein frame method to measure the magnetic properties of non-oriented electrical steel.

In the paper, the dissolution methods of such samples as steel and alloy are studied. Dissolve the samples with hydrochloric acid and nitric acid as well as the optimum instrument conditions of inductively coupled plasma mass spectrum (ICP-MS), select the spectral lines of elements to be tested with high sensitivity and fewer interferences as the analytical lines. The matrix matching is used to eliminate the influences of matrix effect in calibration curve so that the contents of lanthanum, cerium, praseodymium, neodymium and samarium in steel and alloys can be determined with the inductively coupled plasma source mass spectrometer.

In the paper, it is introduced the characteristics that mineral effect and matrix effect of samples might be eliminated by melting samples with borate so that the fused beads of sinter and pellet samples were prepared. The calibration curves were established with optimum working conditions of X-ray fluorescence spectrometer and series of standard samples. The cobalt is as the internal standard element of Fe to simultaneously determine such five components as TFe, CaO, SiO₂, MgO and P in sinter and pellet. The test results showed that the relative standard deviation (RSD, n = 11) of the five components was 0.50%~4.10% as well as the measured values were basically the same as certified values, which could effectively guide site productions.

In the paper, it is introduced the process of establishing the standard system of rare earth steel of Baotou Steel. Its principles and framework are determined, the relative standardization activities are carried out as well as the series of standards of rare earth steel products and basic universal standard of rare earth steel are organized to be formulated by summarizing and studying the construction of national steel standard system as well as the R&D, productions, sales and standardization of rare earth steel of Baotou Steel. On this basis, organize to declare the provincial standards, group standards, professional standards and national standards for related rare earth steel product standards, establish the build report and standard system program of rare earth steel standard system and complete the establishment of standard system of rare earth steel of Baotou Steel.

In order to reduce the constraints of industrial control computer caused by the operating system and computer hardware, the hardware and operating system changes as well as system maintenance should be simplified, so the Rockwell's IDC industrial data center R2000 solution was adopted in the upgrade and transformation of computer system in medium repair of 1^# blast furnace in 2018. Two redundant physical servers were used to run multiple operating systems and application program at the same time with the virtualization technology to separate the operating system from hardware changes so that the hardware requirements were reduced and the reliability of system was improved.