In the article, a type of FeMnAlC series of low density steel is designed. Its tensile strengths of rolling direction (RD) and transverse direction (TD) are both greater than 1 300 MPa as well as it is with higher elongation. On the basis of ensuring stable high strength and toughness of the material, the corrosion behaviors of FeMnAlC series of low density steel in the simulated naval air environment with high temperature, humidity and salt spray are studied through the indoor accelerated test with alternation of wetting and drying as well as the tests with scanning electron microscopy (SEM), energy disperse spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS) to provide the references for evaluating corrosion resistance of the new generation of high strength low density steel.

The stability of rock slopes is mainly controlled by the spatial composing relations between the developmental structural plane in slope rock mass and slope. The stereographic projection is to project the interaction cutting relation of slopes and structural plane space onto a plane, with which the failure types and stability of rock slopes could be intuitively and preliminarily analyzed to provide support for the subsequent treatment of rock slopes. The analysis and determination for failure types and stability of rock slopes with polar stereographic projection are introduced by taking the stability evaluation of rock slope for 2^# open pit of Shuangli Iron Mine of Inner Mongolia Shuangli Mining Co. , Ltd. as an example as well as the prevention measures for unstable rock slope are proposed based on the failure types of slopes.

The comparison tests for corrosion resistances of samples with and without black spots on the surface of Zn-Al-Mg coating as well as the pure Zn coating are carried out with the neutral salt spray tests. There was not red rust for the samples with and without black spots on the surface of Zn-Al-Mg coating with the neutral salt spray tests of 2 000 h and 4 000 h, while there was obvious red rust for the sample with pure Zn coating with the test of 2 000 h and it was increased obviously with the test of 4 000 h. The positions with and without black spots of Zn-Al-Mg coating are analyzed with the scanning electron microscope and energy disperse spectroscopy. The results showed that many fine magnesium-rich eutectic structures were enriched at the position with black spots. There were differences for reflection of light between them and stripy eutectic structure at the position without black spots as well as the magnesium-rich eutectic structures were easily to be oxidized by the oxygen in the air so as to form black oxide so that the visual differences appear black spots. The salt spray test results showed that the corrosion resistance at the position with black spots didn’t deteriorate as well as the corrosion resistances of samples with and without black spots on the surface of Zn-Al-Mg coating were the same good.

In this article, the problem of high scrap rate caused by surface defects of a batch of seamless steel pipes for high strength hydraulic cylinders produced on site is analyzed and studied. There are mainly three categories of surface defects, they are rolling skin, pits and pitted surface by analyzing their morphology. The defects are detected and analyzed with such analytical methods as metallographic examination and scanning electron microscope. The results showed that rolling skin and pits were caused by the existing surface cracks of billet before rolling as well as pitted surface was caused due to the roll compacting of surface scale onto pipe body in the process of hot rolling. In order to eliminate the above defects, the corresponding rectification measures are taken as well as the continuous casting and rolling processes are optimized. As a result, the surface quality of products is greatly improved and scrap rate is decreased from 30.6% to 1.7%.

In the information economy era, the drawbacks of traditional operation and management models for separation of finance and business have become more prominent. The problem that how to overcome the delayed decision-making and inner control of enterprise caused by lag of corporate financial information due to the “information isolated island” has become the urgent problem for many large enterprises. In the paper, it is described the organic integration of finance and business process is prompted through sorting out business processes so as to effectively improve the management level of large enterprises, ensure that financial data could reflect the whole production management process accurately in real time and achieve the effect of dynamic monitoring of important links in the process in detail. Moreover, the three main processes in enterprise operations, that is the business processes, financial accounting process and management process are with interworking and coordination.

The green transportation is the transportation characterized by energy conservation and reduction of exhaust emissions. It is the inevitable trend of future transport development to popularize green and low carbon means of transport as well as weed out and update or remould old vehicles and ships. At present, the internal combustion locomotive is still the main power of railway transportation in plant of Baotou Steel, which is with such disadvantages as high energy consumption and costs and more pollutions so as to be replaced by new energy locomotives in the near future. In the paper, it is briefly introduced the methods for transforming GK₁ type internal combustion locomotive into remote control gas-electric hybrid locomotive, focused on the process of applications in plant of Baotou Steel and analyzed the significances of energy conservation and environment protection, transportation efficiency and cost saving for reformed gas-electric hybrid locomotive through practices of applications.

In this paper, the production technology process and technological parameters of spring steel plate 60Si2MnA are introduced as well as the microstructure that products need could be obtained through corresponding cooling technique (4~9 ℃/s) control, which guarantees the mechanical properties of products. The results showed that the spring steel plate 60Si2MnA with tensile strength not less than 1 050 MPa and elongation not less than 13% could be manufactured through choosing appropriate process parameters with the existing equipment and processes under appropriate conditions of liquid iron and other raw materials. Moreover, the thickness of decarburized layer on the surface of high carbon steel 60Si2MnA is controlled better, which is 18% of requirements of national standard GB/T 1222—2016 through controlling the atmosphere of heating furnace.

The microstructure and mechanical properties of parent metal for 700L beam steel with different titanium contents and specimens with metal active gas (MAG) welding are compared and studied. The results showed that the ferrite grains in the microstructure of test steel were 3~5 μm, there were a small quantity of deformation bands, yield strength was 678 MPa, tensile strength was 760 MPa and elongation was 17.0% when Ti content was 0.11%; the ferrite grains in the microstructure was 4~8 μm, there were a small quantity of pearlite grains, yield strength was 658 MPa, tensile strength was 734 MPa and elongation was 24.0% when Ti content was 0.07%; the strength of the two types of test steel was increased by about 10 MPa, but elongation was decreased by 1.0 and 3.0 percent points respectively and property of root bending of 180° (d = 2a) was qualified after MAG welding; the content of low carbon martensite was increased and microstructure of heat affected zone for test steel was refined with the increase of Ti content.

The 09CrCuSb acid resistant steel (also known as ND steel) is the low alloy structural steel with resistance to sulfuric acid dew point corrosion as well as is applied in such industrial fields as the metallurgy, chemical engineering and petroleum. In this paper, the mass loss and mass loss rate of 09CrCuSbRE and Q235B are compared with the complete immersion of 24 h, 48 h and 72 h at constant temperature of 70 ℃ as well as take the sulfuric acid with concentration of 50% as corrosive medium. The results showed that the change of corrosion resistance rate curve was not obvious and resistance to sulfuric acid corrosion of 09CrCuSbRE was excellent with the extension of corrosion time. With the extension of corrosion time, the corrosion resistance rate curve of Q235B was risen sharply after 48 h, which indicated poor resistance to sulfuric acid corrosion. There are such elements as Cr and Cu on corrosion surface and in corrosion pit of 09CrCuSbRE through observing the corrosion surface with scanning electron microscope(SEM) and energy spectrum analysis. The elements of Cr and Cu in steel are with the effect of passivating steel surface in corrosion resistant environment to prevent the electrochemical reaction between the corrosive medium and matrix of steel. Moreover, the corrosion rate of 09CrCuSbRE is further reduced by adding such elements as Sb and rare earth(RE) in the steel.

In this paper, it is introduced a design of calculating and recording the deviations of predicted and actual rolling forces for all stands of CSP hot continuous rolling mill by the VBA language environment. The deviations of predicted and actual rolling forces for all stands in a certain range are calculated and with classified statistic based on various rolling parameters in the VBA language environment so that the analysis time is greatly shortened and errors of manual computation are reduced as well as the effects of various rolling parameters and specifications on accuracy of predicted rolling forces could be reflected intuitively. Moreover, the effects of various rolling parameters on accuracy of predicted rolling forces are illustrated through analysis combining with the practical examples, which is with great reference significances for adjusting the corresponding secondary parameters for rolling mill.