The armco iron requires the manganese content in steel to be controlled within 0.005%. In order to study the smelting process for low manganese steel, the thermodynamic and dynamic conditions of demanganization reaction are analyzed. The study showed that the lower the temperature of liquid steel was, the higher the oxidizability of slag and oxygen content in steel were as well as the lower the manganese oxide content in slag was, the easier the oxidation reaction of manganese was. When the manganese content in liquid iron is 0.040%~0.055%, the end point carbon content of liquid steel in converter after bessemerizing is controlled at 0.025%~0.035% and final temperature is controlled below 1 620 ℃ so that residual manganese content in liquid steel could be reduced to 0.04%~0.08%. The demanganization rate of liquid steel increases with the quantity of converter slag increases. Without the deoxidation during tapping of converter, the liquid steel and slag in ladle would maintain higher oxidizability. During the refining process in ladle furnace(LF), the manganese content in steel could be reduced by 32% on average and decreasing amplitude is 0.01~0.04 percentage points. The manganese content in steel could be reduced steadily within 0.05% with the combined demanganization processes of converter and LF.

Under the circumstances of environmental protection, production limitation and tension supply of agglomerate, it is becoming a new trend in the development of furnace burden structure for iron making to use large proportion of pellet in 2 200 m³ blast furnace of Baotou Steel. The blast furnace condition maintains stable and trouble-free, application of large proportion of pellets in 2 200 m³ blast furnace of Baotou Steel is successfully realized and the proportion of pellet is up to 50% through adjusting and controlling the bandwidth for matrix of burden distribution, amount of central coke, sequence of material discharge at output section, diameter and length of the tuyere, heat reserve of hearth, basicity of slag as well as actively responding to the changes of furnace condition for operations after the proportion of pellet increases.

The effect of no visible smoke dust is achieved through deeply analyzing the more serious emission of smoke dust after transform the unorganized emission of 1^# and 2^# coke ovens of Baotou Steel Qinghua Coal Chemical Engineering Co., Ltd. as well as transforming equipment and facilities of coal car and relevant equipment of gas export system, which is with a certain reference value to transform unorganized emission of tamping coke oven as well as control fugitive emission of smoke dust in the coaling process of tamping coke oven.

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%.

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.

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.

The 550 MPa grade hot rolled axle housing test steel is rolled in laboratory with the design of medium carbon content+micro alloy Nb and Ti as well as controlled rolling and controlled cooling process. The results showed that the effects of adding moderate rare earth Ce into test steel on its microstructure and strength were not obvious, rare earth Ce reduced the grade of inclusion (class B) in test steel, low temperature impact energy of test steel with rare earth was obviously better than that of test steel without rare earth and fatigue property of axle housing test steel was improved by rare earth Ce.

According to the smelting process of converter, the heat balance of converter is calculated with the heat balance calculation method. The influences of different molten iron conditions, production processes and temperature control on improving the addition of scrap steel are calculated. The specific measures for improving the scrap ratio of basic oxygen furnace(BOF) are put forward by analyzing the factors affecting change of scrap ratio of BOF as well as studying the relations between scrap ratio and smelting process conditions of BOF, which are as references for relevant steelmaking plants.

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 gas flow distribution and gas utilization rate are improved by optimizing the charging system as well as adjusting the material layer thickness of coke and ore aiming at the long-term higher fuel ratio of 5^# blast furnace of Baotou Steel; the smelting is strengthened by such measures as increasing furnace top pressure, hot air temperature and oxygen enrichment rate; meanwhile, the efficiency of tapping iron in front of furnace is improved, daily operations of blast furnace are strengthened and standard work is carried out so that the target of increasing production and reducing consumption is realized. The fuel ratio of 5^# blast furnace reduced from 598.73 kg/t on average in 2020 to 556.9 kg/t, which was the best level in history.