In the paper, the design, main components and features of high pressure water descaling system in the production line of heavy plate of Baotou Steel are introduced and analyzed. Moreover, the system equipment is improved based on the experiences of on-site maintenance and fault handling for high pressure water system in the production line, which is with greater reference significances for the design, maintenance, fault diagnosis and optimization of high pressure water descaling system in the production line of heavy plate.

In this paper, the chemical composition and production process are designed according to the technical requirements of cold rolled 980 MPa martensitic steel as well as the study of its annealing process in laboratory is carried out with pilot-scale test platform. The study results showed that the yield strength was 750~940 MPa, tensile strength reached over 1 020 MPa and elongation was over 10% for the products of cold rolled 980 MPa martensitic steel produced with the same chemical composition and rolling process through adjusting the slow cooling temperature of annealing, which could meet technical requirements. The effect laws of slow cooling temperature on microstructure and properties of cold rolled 980 MPa martensitic steel are clear and definite as well as the soaking temperature is determined to be 800 ℃,slow cooling rate is determined to be 3 ℃/s, rapid cooling rate is determined to be 45 ℃/s and the optimum slow cooling temperature is determined to be 680 ℃ when rapid cooling temperature is 280 ℃ with the composition system combining with the microstructure and mechanical properties of finished products.

The microstructure and texture of ingot blank, hot rolled steel plate, cold rolled steel plate and annealed plate are studied with the optical microscope (OM) and X-ray diffractometer (XRD) as well as the magnetic properties are tested with magnetic tester. The results showed that the central equiaxial crystal ratio of continuous casting billet could reach 44.5% with electromagnetic stirring, surface structure of hot rolled steel plate was with perfect recrystallization by adopting high temperature coiling process and average grain size was 28.5 μm as well as the microstructure in the center of hot rolled steel plate was with interlaced composition of recrystallized grain and long strip shape banded microstructure and average grain size of annealed plate was 74.2 μm. The distribution of texture in the thickness direction of hot rolled steel plate is uneven. The surface textures are mainly brass texture and goss texture, textures of 1/4 layer are mainly {100} and {112} components, central textures are mainly {100} and {110} components as well as textures of annealed plate are mainly composed of {111} and weaker {100} planar textures. The magnetic property of sample plate of finished product randomly drawn is measured with the Epstein square method and the results could meet user requirements.

In the paper, it is introduced the mineralogical characteristics of minerals named by geographical names and person names in Bayan Obo ore deposit. There were once 7 kinds of minerals named by geographical names, but 3 kinds are confirmed at last as well as there are 5 kinds of minerals named by person names. They are all new minerals, of which the Nioboixiolite-(□) is the most recently approved new mineral. The minerals named by geographical names are with not only their own narrow mineralogical meanings, but also other generalized meanings. The narrow meaning of minerals named by geographical names refers to just a specific kind of mineral, while their generalized meaning usually refers to various ores produced in the region.

The Φ7.3 mm wire rod without drawing for high-speed wire rod is rolled successfully by reasonable roll pass and guide designs as well as optimization of control process aiming at the individual requirements of it in market combining with the characteristics of the fifth-generation Morgan high-speed wire rod mill. As a result, the usage requirements of users could be satisfied very well and product mix of the fifth-generation Morgan high-speed wire rod mill is widened, which could provide the references for developing like products subsequently as well as a brand new market is exploited and the green production in the whole process of industry is realized.

The S450J0 steel pile is vanadium nitrogen alloy steel in H section steel family as well as it is with such characteristics as high strength, heavy gauge, good impact toughness and weldability. In the paper, its key technologies and processes are mainly introduced. The composition of steel is designed as well as the relevant smelting, continuous casting and rolling processes are formulated based on the performance requirements of products. The production practices show that the composition design of S450J0 is reasonable and products could meet the requirements of technical agreement. The technical difficulties are the stable control of high nitrogen content in industrial productions and rolling of heavy gauge with small compression ratio.

The spindle of gang saw, running and positioning of baffle trolley are driven by four Siemens servo motors as well as the control system is 611U frequency converter. The Siemens 611U frequency converter has gone out of production, so the spare parts purchase is difficult and manufacturing cost is high. The spare parts of S120 frequency converter that is widely used in field are universal and it is with easy maintenance. A lot of downtime caused by main drive system failure could be avoided by using the S120 system as backup system of 611U system to synchronize data and switch flexibly so as to avoid affecting productions. After adopt the new S120 system as backup system, the safe operations of production line is ensured, production capacity and maintenance efficiency of equipment are improved as well as the equipment is upgraded and reformed so that the service life and cycle are extended.

The 4^# slip mass in area D of the main stope of Bayan Obo Iron Mine is above the fixed transport corridor of 1 458 m to 1 430 m of the main line of stope as well as it is mainly composed by piling up loose gravel and dimension stone so that the larger and extremely unstable slope structure is formed, which directly threatens the safety production of lower part. If it is not treated in time, it will cause to suspend production in the whole stope. The treatment scheme of taking the 1 542 m platform as dividing line of step by step governance, adopting the method of cutting slope and reducing load at upper part as well as adopting the cleaning and reinforcement of slope at lower part is established through actual investigation and analysis of current situations for 4^# slip mass. The expected goals and effects are completely achieved after implement the treatment scheme so that the conditions of safety production at lower part are effectively improved, which could be as reference in future slope treatment.

In this paper, it is analyzed the essential differences between cost budgeting with ERP system and traditional cost budgeting as well as discussed the advantages of ERP system in cost budgeting based on its characteristics in the cost budgeting process of iron and steel enterprise combining with the actual production of an iron and steel enterprise. The degree of participation and work efficiency of all staff in cost budgeting are significantly improved by the high synergy and efficiency of ERP system in production practices, which could provide timelier and more reliable data for deploying production decisions of company.

The phase transformation law is analyzed through determining the transformation kinetics curve of supercooled austenite for U71Mn steel. The effects of cooling rate and finish cooling temperature on microstructure and hardness are studied with the thermal simulation tests of sectional type cooling strengthening based on the heat treatment process of rails on site. The results showed that the critical cooling rate of perlitic transformation for U71Mn steel was 7 ℃/s and temperature range allowing perlitic transformation was 500~600 ℃. The reasonable process parameters of sectional type cooling for U71Mn steel were that the starting cooling temperature was 850 ℃, cooling rates was 6~12 ℃/s and finish cooling temperature was 570 ℃. The perlite structrure could be obtained with this process parameter and it could meet the hardness requirements of rails.