The information barriers could be broken through and the target of data value conversion could be ensured to be realized with data sharing and exchange platform, important product of the digital age. Due to this platform covers several links of data processing including collection, transmission, storage and sharing, it greatly supports cross-department and cross-disciplinary collaborations. The open features of platform are relatively prominent and diverse security risks are faced in operations so that smooth operations of the platform are influenced. In order to maintain normal operations of the platform and ensure to realize its functions, such safe protection measures as strengthening the service supply chain management of platform, perfecting data security management system and strengthening applications of protection technologies are proposed based on full process safe protection of platform, which are hoped to strengthen the safety defense line for operations of platform to maintain the security in each link of data transmission, sharing and exchange.

With the rapid development of economy in our country, the demand of cold rolled steel plate products is increased continuously and wastewater containing thin oil has become one of the main types of wastewater in iron and steel enterprises. It is crucial for reaching the standard of environmental protection and recycle of water resource in enterprises to efficiently and stably treat the wastewater containing thin oil. In the paper, the removal effect and operating characteristics of chemical oxygen demand (COD) in each process section are systematically analyzed through the data of over 700 water quality tests in one year based on the combination process of neutralization-coagulation flocculation-air flotation-bioactive sludge by taking the treatment system of wastewater containing thin oil in Cold Rolled Rare Earth Steel Plate Plant of Baotou Steel as research object. The results showed that the average removal rate of COD in pretreatment unit of flocculation-air flotation could reach 75.24% so that degradable organics could be efficiently removed; recalcitrant wastewater was further degraded with biological system and the COD of final effluent was stably lower than 70 mg/L. The study could provide data supports and practical references for stable operations, process optimization as well as operation and maintenance control of system of wastewater containing thin oil in cold rolling.

The operation stability of strip steel in production line of continuous annealing directly affects the surface quality, dimensional accuracy and efficiency of production line. In order to reveal the effect laws of single side wave shape and asymmetric center wave on sensitivity to deviation, the explicit simulation model of power for single furnace roller is established to systematically evaluate the effects of such parameters as wave height, wave length and wave width on deviation of strip steel. The results showed that the larger the wave height, the greater the deviation at fixed position and the maximum sensitivity was at wave height (H) of 4~9 mm; the greater the wave length and wave width, the smaller the deviation as well as sensitivity was significantly increased when wave width was below 300 mm. These findings could provide the basis for strip shape quality control of incoming materials and improvement of deviation in continuous annealing as well as quantitative references for roll shape optimization and selecting online corrective parameters, which are helpful to improving the operation stability of unit and product quality.

In this paper, the narrow lap welding process and evaluation method of weld quality for over 1 180 MPa grade cold-rolled high-strength steel are elaborated. The types and causes of weld defects are analyzed and investigated through weld test so that the parameter adjustment methods for eliminating weld defects and improving weld quality are determined. The weld joints are qualified according to the feedback of welding monitoring system, the results of cupping test for weld joints are qualified and the fracture not at weld joint in tensile test could meet the requirement. The results proved that the weld joints of the material were qualified with the combination of welding process parameters of low welding current, low welding speed and high welding pressure.

In the paper, the design, research and development and performance verification of high-efficiency intelligent dry-wet cooling tower are carried out by taking the working conditions of high temperature, heavy dust and high load in the whole process of iron and steel as application scenarios as well as combining with plate-fin demisting heat exchange and intelligent collaborative control technology aiming at the pain points of high energy consumption and water consumption, poor adaptability of working conditions and high operation and maintenance costs for cooling system of ferrous metallurgy. The results showed that the automatic precise switch of dry model and wet model could be realized with the cooling tower, which was adapted to the cooling requirements of the whole process of iron and steel; annual average water-saving percentage could reach 22.3%; zero mist operation could be realized at the working condition of -10 ℃ and relative humidity of 70% so that such industrial problems as scaling, abrasion, drifting mist and higher energy consumption of traditional cooling tower could be effectively solved.

The hourly output and output per shift of pickling line tandem cold mill are influenced by such factors as varieties, specifications and production transition processes of products as well as the differences are significant. Currently, the evaluation of production efficiency is carried out by adopting the mode of converting into output or coil quantity for most mills, which is with such limitations as single evaluative dimension and insufficient objectivity of results. In the paper, the existing production specifications are divided into 16 class intervals combining with the actual productions of pickling line tandem cold mill and objectives of productions are set based on the characteristics of each class interval aiming at the problem. The quantitative evaluation system of monthly production efficiency and efficiency of each shift or group is established through the two core indicators, hourly coil quantity and rate of reaching the standard. Practices show that the multidimensional production efficiency evaluation could be realized with this system, which could provide the evaluation basis for optimizing production efficiency of shift and group as well as be with value of extensive promotion.

The 310 zed beam is mainly used for manufacturing the automotive frame at the bottom of railway freight car and oil tank truck, so the requirements of its corrosion resistance, strength and surface quality are extremely strict as well as the surface defects could directly affect its service life. Its main surface defects include local dent at shoulder, bracing wire and roll marks. The amount of main defects is significantly decreased by taking such measures as optimizing roll pass design of UR (universal rolling) mill as well as improving guide fittings of BD2 (second breakdown) mill and CCS (compact cartridge stand) mill so that the quality of 310 zed beam is improved, which could meet the development demands of railway heavy haul traffic.

In order to expand the product type mix of CSP production line and break the technical bottleneck of producing microalloyed pipeline steel with compact process of strip steel, the industrial trial production is carried out based on Q355B bridge mode with smelting of KR (kambara reactor)-BOF (basic oxygen furnace)-LF (ladle furnace)-CC (continuous casting) and low C-Mn-Nb-Ti microalloying system by taking the pipeline steel L415M as the object in this paper. The results showed that the performances of sample with the specification of 9.75 mm could meet the requirements as well as there was performance fluctuation at head and in the direction of 45° for sample with the specification of 7.75 mm. Due to the limit of equipment conditions, the grain is coarser, strength is lower and yield ratio is higher for the product. The stability of product with thin specification could be improved by optimizing the composition and process, which could provide the technical support for large scale production of pipeline steel with the CSP production line.

In this paper, the causes of black spot defects on hot-dip galvanized products are mainly studied and corresponding countermeasures are put forward. It is proved that the main causes of macroscopic black spot defects are the impurities on coating surface, i.e. zinc dross defect and exposure of base steel caused by indentation through microscopic analysis and research. The amount of such defects could be effectively controlled by controlling the amount of zinc dross on galvanized plate surface, repairing top roll of cooling tower and wrapping it with cloth.

A series of low temperature impact tests are required for the welding experiment of BT620QL6 low temperature crack arrest steel plate so that multiple times of preparation and processing for impact samples of test piece for welding are needed. The slotting positions of welded samples cannot be ensured to be precise in welding heat affected zone so that the welding impact test results could be influenced and fluctuations of series of low temperature impact absorbing energy are greater with traditional processing method of impact sample. In the paper, the slotting positions of impact sample notch of welded plate are determined, uniformity and continuity of machining dimension precision for samples in the same group are ensured, sensitivity of welded impact samples on sampling positions is eliminated as well as preparation efficiency of sample for welded plate is improved through improving the processing method of sample for welded plate combining with the standard requirements of test sample for welded plate. The test results showed that the stability of data for impact property of BT620QL6 welded plates was improved with the improved processing method of impact sample.