The components of Cr-Mo microalloyed steel are designed and developed according to the performance requirements of C110 oil casing with resistance to hydrogen sulfide corrosion as well as the industrial tests are carried out based on the research results of characteristics of steel in laboratory. The results showed that the designed product was with good strength and toughness after heat treatment of quenching and high temperature tempering, which could satisfy the requirements of mechanical properties of standard; while when the yield strength satisfied the standard requirement and was less than 800 MPa, the tube was with excellent resistance to hydrogen sulfide stress corrosion and the percent of pass for test of resistance to hydrogen sulfied was more difficult to achieve 100%.

The design of power supply system in workshop needs to consider such factors as the reliable power supply, economic rationality, advanced technology and future development. In this paper, such aspects as the design principles and thoughts of high and low voltage power supply systems in steelmaking workshop of a converter project are discussed. The high voltage power supply system is elaborated mainly from such aspects as power distribution system and relay protection as well as the low voltage power supply system is elaborated mainly from such aspects as the system partitioning, power distribution system, safe power supply and security measures.

In the paper, the scheme of establishing a self diagnosis model for high speed rolling bearing is proposed considering the complexity of rolling bearing fault diagnosis and combining with the difficulties of rolling bearing fault diagnosis for equipment on site. The original vibration signal of rolling bearing for high speed gear box is decomposed using the wavelet packet, then frequency domain signals in different frequency bands in decomposed original vibration signal are reconstructed and the characteristics of shock pulse energy for rolling bearing fault of reconstructed frequency domain signals are extracted respectively. The extraction of characteristics for rolling bearing fault of high speed gear box is realized and they are used for establishing the self diagnosis model for high speed rolling bearing through comparing the characteristics of impact energy for rolling bearing extracted from each frequency band after reconstruction as well as extracting frequency band signals sensitive to energy changes aiming at different types of rolling bearings.

The coiler in production line of hot continuous rolled strip steel is the only equipment for coiling strip steel after rolling and its stability of working condition directly affects the stable production of production line, yield and appearance quality of coil of strip. The level of stiffness of wrapper roller for coiler is the core factor determining stability of coiler. In the paper, the concept of stiffness of wrapper roller for coiler in production line of hot continuous rolled strip steel as well as the significances and methods of static test are elaborated. The analysis sheet of stiffness of wrapper roller is obtained through tests as well as collecting, analyzing, summarizing and calculating related data. Guide the craft personnel to set and optimize parameters as well as equipment personnel to eliminate defects purposefully to ensure stable operation of coiler, reduce coiling accidents and improve yield as well as ensure coil shape and appearance quality of strip steel.

In order to realize the intellectualization and informatization of coal blending management for coking, the optimized coal blending system composed of single coal database, coke quality prediction module, cost performance evaluation module of single coal and optimizing design module of coal blending is independently developed. With the Access as background database, the functions of each module are realized through such algorithms as invoking programming solver by VB+EXCELVBA hybrid programming technology and multiple linear regression. The production applications show that the system plays a prominent role in reducing production cost of coking and stabilizing coke quality.

In the paper, such problems as printing wrong label, wrong labeling, high labor intensity of operators and potential safety hazards due to the cross operations with crane on site aiming at the manual labeling for outer and inner surfaces of steel coils after skin rolling in the skin-pass rolling production line. The mutual communication and control of each system are completed as well as the automatic labeling with mechanical arm instead of manual work is realized through designing the electrical automation control, upper computer control, motion control of mechanical arm, clamp and pneumatic system of automatic labeling system for steel coils in the skin-pass rolling production line so that the labor intensity of operators reduces and life safety of personnel is ensured. The automatic labeling system can be as the reference for replacing the manual operation with mechanical arm under the similar conditions.

In this paper, it is introduced the audio intelligent recognition system for industrial equipment fault is designed and integrated into the patrol robot. The robot could collect real-time audio data of equipment in inspection area and transmit them to the edge computing module inside itself to automatically carry out model training, extract and compare acoustic feature as well as give an alarm in time when there are abnormal characteristics when it is doing inspection tasks so that the recognition of internal fault of equipment could be realized. As a result, the detection is more comprehensive and accurate through solving the problem of limitation of visual detection.

The zinc and copper are separated from lead and tin based on the characteristics that ammonium hydroxide, zinc and copper form complex ions as well as ammonium hydroxide, lead and tin form precipitates. The effects of the acidity of zinc, lead and tin titrated with ethylene diamine tetraacetic acid (EDTA), added quantity of thiourea and ammonium fluoride as well as buffer solution on determination are tested. The test results showed that the pH value of solution acidity was 4.5~5.0 and selectivity of titration was higher when zinc was titrated with EDTA; pH value of solution acidity was 5.0~6.0 when determined lead and tin as well as the colors at titration end point changed sharply. The interference of coexisting ions could be avoided by adding sulfosalicylic acid. The determination range of this method is 0.50%~20%, relative standard deviations of zinc, lead and tin in tin bronze samples are all smaller than 2.0% through analysis as well as adding standard recovery is 97%~103%.

The design budget estimate is the important basis for investment cost control of metallurgical engineering. In this paper, it is briefly introduced as well as it is analyzed the common problems in the process of preparing design budget estimate for metallurgical engineering such as investors do not pay enough attention to the preliminary design budget estimate, content provided by designer is incomplete and level of budget estimate preparers is insufficient. Moreover, the corresponding improvement suggestions and several countermeasures to improve preparation quality of budget estimate are given-select accurate prices of materials and equipment, implement strict review and approval process as well as carry out comparative analysis with the feasibility estimate to ensure the accuracy and completeness of budget estimate.

In this paper, it is systematacially introduced the background, specific implementation process and achievement for the integrated management mode of production, marketing, research and development and forwarding in Rare Earth Steel Plate Co. as well as comprehensively summarized the important measures in operation process. The exploration and practices on the management mode promote the performance of production and management and management level of enterprise to be improved as well as provide the references for propelling the reform of management mechanism and improving the management efficiency of other enterprises in the iron and steel industry.