In the paper, it is introduced the Charpy pendulum impact test and drop weight tear test (DWTT) of L360M pipeline steel coil plate with the thickness specification of 11.00 mm. The test results showed that the differences of toughness at relevant positions of the same plate are smaller. It can be seen from the macroscopic morphology of fracture of samples for DWTT that the bigger the deflection of samples, the more obvious the distortion of samples for fracture after hammering to breakage, even some samples could not be hammered to breakage completely because of warping.

In this paper, the continuous cooling transformation (CCT) behavior of undercooled austenite and hardenability at different quenching temperatures of 770 MPa grade steel for crane boom are systematically studied. The critical transformation points of test steel are determined and evolution rules of metallographic structure for test steel at different cooling speeds are analyzed through thermal simulation test. The results showed that complete martensitic structure could be obtained when cooling speed reached above 30 ℃/s. The depth of hardening layer corresponding to 50% of martensitic structure content was 30 mm when hot quenching was at 920 ℃, which showed that test steel was with good hardenability.

In this article, the low temperature performances of 60 kg/m as-hot-rolled U71Mn and U75V rails as well as U71MnH and U75VH rails after on-line heat treatment produced by Baotou Steel are studied. The relation between the toughness and temperature of different rails in low temperature environment is studied through impact test and test for fracture toughness of rails in the low temperature environment created in the laboratory. It is elaborated the performance indexes of safe service for rails of Baotou Steel in low temperature environment and summarized the relations of toughness indexes for four types of rail products of Baotou Steel in low temperature environment, which provide the data support for selecting rails in plateau and low temperature regions as well as safe operations of railway system in extremely cold environment.

With the increasing development and utilization of marine resources, corrosion of structural materials of marine engineering is facing severe challenges. In this article, it is summarized the research progress on corrosion status of steel in marine environment as well as deeply analyzed such influencing mechanisms as marine atmosphere, splash zone of seawater, tidal and splash zone as well as immersion zone of seawater on corrosion behavior of steel. The main current technical measures to retard corrosion of steel in marine environment are summarized as well as development direction and application prospect in future marine engineering of new corrosion-resistant steel are discussed by discussing the effects of such environmental factors as dissolved oxygen, salinity, temperature, pH value and microorganism on corrosion rate of steel aiming to provide the technical support for improving corrosion resistance of structural materials of marine engineering.

In this paper, the effects of different quenched-tempered heat treatment processes on the microstructure and mechanical properties of 30CrMoA round steel for sucker rod are studied. The strength and toughness of the material are improved by adjusting the quenching and tempering temperatures as well as optimizing heat treatment process aiming at the actual application requirements of 30CrMoA steel. The experimental results showed that the yield strength, tensile strength, yield ratio and impact energy of the material could be significantly improved with proper quenching and tempering, especially under the conditions of 850 ℃ quenching(water cooling) +540 ℃ tempering (water cooling), the comprehensive mechanical properties of round steel 30CrMoA for sucker rod were the best, which was with good strength and toughness. The metallographic analysis showed that the quenched and tempered microstructure was mainly composed of tempered sorbite, which was with stable microstructure.

There are such situations as wear and track gauge that is out of tolerance as well as such accidents as offtrack of travelling wheel for coke guide and fracture of track in the process of production and operation more than once due to overage service of the track for coke guide of 6 m coke oven of Coal Coking Chemical Industry Branch Co. so that the coke oven stops production frequently. The size of track is determined to be with the height of 1 61 0_{-2}^{+3} mm and center distance of 2 70 0_{-2}^{+2} mm by taking starting points of the tracks at the ends of coke guide as reference as well as combining with the surveying and mapping values of track through on-site measurement and survey. For the construction, old track is completely replaced without stopping production by using the thermit welding method of track joints so that on-site production requirements could be met. This method could be popularized to the replacement of tracks for coke guide in coking industry.

In the detection of building foundation piles, crosshole sonic logging is the important detection method to judge the integrality of pile body for cast-in-place concrete pile. In this paper, it is introduced the basic principle and judgment basis of detecting integrality of pile body with crosshole sonic logging as well as summarized the process flow and matters needing attention of on-site detection by taking the project of archives center in a city as an example, which provide accurate detection data for the quality of foundation pile in project.

The status survey and heat loss test of steam pipeline network system of Baotou Steel are carried out as well as its amount and rate of heat loss during heating season in the winter are calculated aiming at its existing problem of great heat loss. The energy saving transformation measures to reduce heat loss of steam pipeline network system are put forward by analyzing current influencing factors of greater heat loss for the system, which could provide the reference for transforming steam pipeline network system of Baotou Steel.

It is helpful for better energy management and optimization as well as realization of sustainable development of enterprises to improve the accuracy of energy measurement. The accuracy rate of data acquisition could be improved by strengthening energy measurement management, perfecting relevant management systems, selecting reasonable sampling points and acquisition and calculation modes as well as using means of data analysis so that the facticity, reliability and fairness of energy data could be guaranteed, which could provide strong supports for such aspects as energy conservation and emission reduction, cost accounting and quality control of enterprise.

The management of receivables and payables is an important part of financial management in enterprise. If it is not in place, it will affect the capital chain of enterprise and then impact normal operations of enterprise. Therefore, the management of receivables and payables in enterprise should be strengthened as well as risk control of receivables and payables should be paid more attention to. In the article, it is expounded the necessities of management of receivables and payables as well as analyzed the management and risk control of receivables and payables with the SWOT model to reveal their internal strengths, weaknesses, opportunities and threats they are facing by taking a research institute as an example, which could provide the reference for formulating effective management strategies and risk prevention measures.