The hot dip galvanized fingerprint resistant plate for high-end home appliances with excellent corrosion resistance, humidity resistance, fingerprint resistance and coating performance is developed through the reasonable process design and combining the film-forming mechanism of passivation solution with features of steel plate. Such indicators as the corrosion resistance, electrical conductivity and humidity resistance could all meet the technical requirements for delivery. It is widely used in manufacturing the outside plate of such high-end home appliances as the computer chassis, server, film and television sound equipment and automatic office system. Unitl now, the capability of steady mass supply is ensured.

In this article, the low cost industrial production plan of pickling high strength automobile structural steel QStE420TM is introduced. The product performances are guaranteed to meet the standard requirements as well as the goal of saving alloy cost is achieved by redesigning the chemical composition, adding the ferro-titanium with lower price to replace part of the ferro-niobium with higher price in the smelting process as well as optimizing the rolling process, which provide the ideas for reducing alloy costs of other series of products.

In this paper, it is introduced that the chemical composition design as well as smelting, continuous casting, rolling and heat treatment technologies of steel plate for trial produced 960 MPa grade heavy machinery by CSP Plant of Baotou Steel. Moreover, its microstructure and performances are tested. The results show that it is pure, the inclusion content is low, matching of low temperature toughness and strength is good as well as the weldability can be compared with the like products in China.

In this paper, such current situations as poor coil shape manufactured with the recoiling line of cold rolling production line, larger deviation of wave heights between the work side and drive side of exported strip steel as well as short service life of rubber roll are studied. The production practices for improving the shape of cold rolled recoiling coil have been carried out starting from the deformation of vertical looper frame and the effects are good. The shape of recoiling coil is improved as well as the effect of reducing cost and increasing efficiency is achieved.

The 650 MPa grade high strength wheel rim steel is developed with the low carbon Nb-Ti microalloying component system as well as controlled rolling and cooling process. The changes of mechanical properties and metallographic structure of materials after weld thermal cycle as well as the precipitation and dissolution of Nb and Ti carbonitrides are mainly studied. It is concluded that the finer the precipitates of material matrix, the greater the dislocation density and the greater the decrease of strength of heat affected zone compared with the matrix and weld joint. When it is lower than the coordinated deformation force of material in the process of hole enlargement and shaping for rim, the cracking of the heat affected zone or the quality defect of necking is occured.

In this paper, the influence factors of atmospheric corrosion resistance of weather resisting steel Q450NQR1 for railway vehicles are introduced. Its microstructures and inclusions are analyzed by scanning electron microscope as well as the influences of such factors as type and homogeneity of microstructure, grain size and non-metallic inclusions in steel on the corrosion resistance of weather resisting steel are discussed. The study results show that the corrosion rate of weathering steel decreases and the corrosion resistance in atmospheric environment increases by 31% when its grain size decreases from 11.2 μm to 7.5 μm.

It will be one of effective means to improve the performances of hot-rolled section steel to replace the microalloy addition with green, energy-saving, low-cost and resource-friendly controlled cooling technology after rolling. The metallographic structure of product with controlled cooling after hot rolling is ferrite + pearlite, the morphology is fine, performance is uniform, yield strength is increased by about 70~100 MPa and tensile strength is increased by about 80~150 MPa. In the paper, the research ideas, methods, experimental simulation and application examples of controlled cooling after rolling for high-strength section steel are introduced by taking angle steel as an example. The results show that the experimental data and simulated results are consistent with the production practices, which proves that the research method proposed in this paper is accurate and effective so that it can provide the reference for researching controlled cooling of angle steel and other hot-rolled section steels.

In this article, it is introduced a series of high temperature tempering tests for 75 kg/m on-line as-heat-treated bainite rails in the laboratory as well as compared and analyzed the conventional mechanical properties, fracture toughness at-20 ℃, spreading rate of fatigue crack, residual stress and microstructure of rails with different tempering processes. The test results show that the strength, hardness and residual stress of on-line as-heat-treated rails decrease linearly; such toughness indexes as fracture toughness at-20 ℃ and impact energy firstly decrease and then increase with the tempering temperature increases as well as the performance indexes of fracture toughness and spreading rate of fatigue crack are better than those at low temperature tempering state. The on-line as-heat-treated with high temperature tempering is with higher fracture toughness and lower spreading rate of fatigue crack so that the characteristics of high toughness and resistance to generation and spread of crack for bainite rails could be further exerted.

In the paper, it is studied the stelmor process of wire rod for 600 MPa grade high strength welding wire and analyzed the influences of alloying elements on the performances of welding wire. The phase transition temperature intervals of hot-rolled welding wire steel at different cooling rates are determined by CCT curve measurement. Moreover, the influences of tapping temperature and cooling rate on the drawing performance of welding wire steel are analyzed. The practices prove that all indexes of wire rod for 600 Mpa grade high strength welding wire could meet user requirements.

Aiming at the accidents such as the grinding machine measuring arm is damaged, the flaw detection device is scratched, and the roll position deviates from the initial position during grinding, this paper puts forward the solution of changing the z-axis limit position and integrating the anti-collision switch in the measuring arm through the inspection of the limit of z-axis running system, X-axis feeding system and X1 axis measuring system, as well as the inspection of motor, deceleration and code disk, as well as the analysis of the measuring system. It ensures the stable operation of production and has the characteristics of strong operability, less investment and easy popularization.