In this paper, it is systematically summarized the adjustment of upper and lower 3^# blast furnace as well as emphatically analyzed the changes of furnace condition when the fuel in furnace is improved by taking replacing tamping coke with top charging coke for 3^# blast furnace in 1^# Iron-making Workshop of Iron-making Plant as an opportunity.

In the paper, it is introduced the ultra fast cooling production process suitable for hot-rolled dual phase steel is developed based on the CSP production line with short process and its industrial applications are realized. The results showed that ferrite grain became finer and tensile strength increased with the finish rolling temperature decreased; ferrite grain became finer and tensile strength decreased with the medium temperature decreased; the reasonable process parameters were obtained that with the finish rolling temperature of 840 ℃, medium temperature of 670 ℃ and coiling temperature of 170 ℃, the 540 MPa grade hot-rolled dual phase steel with thickness of 6.0 mm produced was with the microstructure of ferrite and martensite, yield strength of 330~360 MPa, tensile strength of 560~590 MPa and elongation of 30%~36%, which met the product requirements very well.

In this paper, the productive process is summarized from the concentration, pH value, granularity fitness and saponification value of emulsion used in Baotou Steel. The results showed that when the emulsion concentration of final stand is within the range of 0.9%~1.1%, pH value of emulsion is within the range of 5.8~6.0 and saponification value of emulsion is greater than 160 mgKOH/g, the reflectance of strip surface is relatively higher, contents of residual oil and residual iron are within a reasonable range as well as surface clearness of strip is better.

The weather-resistant wide and heavy steel plate for bridge with yield strength of 500 MPa has been developed. It is with such comprehensive properties as high strength, high toughness, processing without deformation, resistance to low-temperature fracture and high weather resistance that it can meet the requirements of GB/T 714—2015 standard as well as is suitable for using in extremely cold areas and without coating.

It is the key factor to strictly control the contents of C, Mn, P, S and gas elements in steel for improving purity of molten steel, decreasing segregation of casting blank and improving H₂S corrosion resistance. The loss of strength caused by low manganese can be made up by adding the alloy element Cr. It is the important link to reasonably formulate the process system of smelting, continuous casting and hot rolling for guaranteeing products to meet user requirements. The chemical composition and process design of L245MS/BMS hot rolled coil produced by Rare Earth Steel Plate Plant of Baotou Steel are reasonable, it is purified as well as with uniform microstructure and good synthesized mechanical properties, especially the resistance to hydrogen induced cracking and stress corrosion. This design scheme is mainly suitable for producing the export products.

In this paper, the actual demand of cold rolled low carbon products for current users is introduced. The process optimization of SPCC for the first trial production with the continuous annealing production line of Rare Earth Steel Plate Plant of Baotou Steel is to reduce the yield strength range, eliminate yield platform and improve mechanical properties of products so that the yield strength is controlled at lower than 230 MPa, which could meet the market requirement.

In this paper, the key technology of a new generation of cold-rolled fatigue-resistant glassed steel for inner container is described. The chemical composition and cover annealing process of cold-rolled low carbon plate are designed as well as the mechanical properties and metallographic structure of the cold-rolled plate prepared are analyzed. The experimental steel plate is made into inner container of water heater as well as the enamel and bulge tests are carried out. The results showed that the fatigue resistance of inner container of water heater was significantly improved and the times of pressuring could reach more than 150 000 when the mechanical properties of the cold-rolled steel plate were controlled at yield strength of 220~270 MPa, elongation≥38% by adding proper amount of Nb and rare earth element as well as with the annealing process so that it is with good enamel property, stamping formability and fatigue resistance.

The detection study on low temperature impact fracture and microstructure of BT100H sleeving steel with Zeiss Axio Obserevr D1m metallographic microscope and EVO 50HV scanning electron microscope is introduced. The research showed that the low temperature impact toughness, especially the transverse impact toughness of material was improved by rare earth as well as the rare earth also was with a certain function of refining microstructure.

In this paper, it is mainly discussed the process control and analysis on microstructure and properties of Q420NQR1 weather-resistant hot-rolled H beam for railway vehicles produced with section of beam blank. As a result, its microstructure and properties all meet the design requirements as well as the product performances meet requirements of stability, reliability and safety for the materials of railway vehicles through such process controls as its chemical composition, smelting, heating and rolling.

In the paper, the bending defects of electrode flat steel are studied as well as the process, operations and equipment for them are analyzed. The thermal stress and deformation stress of rolled pieces are improved, bending of flat steel is reduced, first pass yield of hot rolling of electrode flat steel is improved, labor intensity of workers is reduced, product delivery time is shortened, market competitiveness is enhanced and market share is increased through a series of improvement measures such as controlling heating temperature, improving pass system, operation standardization as well as the technological improvement of transportation and cooling equipment.