The hot rolled coil plate for pipeline steel is mainly used for manufacturing delivery welded pipe of petroleum and natural gas. In this paper, the development of hot rolled coil plate for L485M pipeline steel with heavy gauge and low costs is introduced. The design with diversified alloy systems of C-Mn-Cr-Mo or C-Mn-Cr-Mo-Ni as well as smelting of clean steel and thermo mechanical control process (TMCP) are adopted. The microstructure of developed L485M hot rolled coil plate is acicular ferrite+granular bainite and precipitate is homogeneous. The L485M hot rolled coil plate is with such characteristics as high strength and excellent low temperature toughness through such mechanisms as dislocation strengthening and precipitation strengthening. The experimental results showed that the L485M hot rolled coil plates with and without Ni element could meet the technical requirements as well as was with capacity of batch production, which is beneficial for enterprises to reduce costs and increase benefits.

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.

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.

The test steels with different La contents are smelted in vacuum induction furnace under laboratory conditions. The morphology and size of inclusions are studied with X-ray diffractometer, field emission scanning electron microscopy, Bruker energy spectrometer, OTS software and electron probe micro-analyzer (EPMA). The results showed that the inclusions, AlN and Al₂O₃ are modified into La-O-S, La-O-S-Al and LaS as well as inclusion size was decreased from 4.37 μm to 2.92 μm by adding La into X100 pipeline steel. The refinement effect of La on austenite grain size is obvious. With the increase of La content, austenite grain size in test steel is increased from level 5 to level 8.5. After adding rare earth La, the main inclusions in steel are La-O-S and La-O-S-Al of about 2 μm in size with the pinning effect so that austenite grain size is reduced significantly.

In order to explore the effects of adding Indian powder ore on the production efficiency and quality of sinter, the experimental studies on basic sintering characteristics and sinter pot of Indian powder ore are carried out respectively. In the experiment, the current iron charge configuration of 2^# Sintering Workshop of Iron-making Plant is taken as the datum point as well as the Mongolian powder ore and high-silicon Brazilian coarse powder ore are replaced by Indian powder ore respectively. The performances of Indian powder ore are comprehensively evaluated from such aspects as the chemical composition, size composition and quality index of sinter, which provide the basis for determining appropriate adding proportion.

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.

In the paper, the theoretical inter-hole delay time and theoretical delay time between rows for such three types of lithology as iron ore, dolomite and slate in firing network are calculated by averaging as well as reasonable parameters are formulated to organize and launch bursting test through analyzing domestic and foreign rock breaking theory of millisecond blasting. The study showed that the reasonable inter-hole delay time of dolomite was 32 ms and that with blast block≤800 mm accounted for 98.17%; reasonable inter-hole delay time of slate was 40 ms and that with blast block≤800 mm accounted for 91.11%; reasonable inter-hole delay time of iron ore was 28 ms and that with blast block≤600 mm accounted for 82.16%. The proportions of qualified block corresponding to reasonable delay time of each lithology are increased.

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.

In the paper, the blast furnace smelting with large proportion of pellets is summarized as well as the effects of such processes as pelletizing, sintering and blast furnace on energy conservation and emission reduction of steel productions are quantificationally analyzed combining with actual production situations. The results showed that the carbon emission, energy consumption and pollutant discharge amount per ton of steel could be reduced by increasing the proportion of pellets and reducing the proportion of sinter in blast furnace. The study could be as reference for energy conservation and carbon emission reduction in the iron and steel enterprises with blast furnace-converter production process.

In this paper, such aspects as microstructure, hardness and wear resistance of rare earth wear resistant steel plate BTNM450 of Baotou Steel and NM1^# wear resistant steel plate produced by a foreign manufacturer are selected to be compared and analyzed. The study results showed that the wear extent of rare earth wear resistant steel plate BTNM450 of Baotou Steel was 0.390 0 g, which was significantly fewer than that of NM1^# wear resistant steel plate. Compared with the wear resistant steel plate BTNM450-NORE without adding rare earth elements, the wear extent of rare earth wear resistant steel plate BTNM 450 of Baotou Steel after adding rare earth elements is reduced by 20.9%. The hardness distribution on section of NM1^# wear resistant steel plate is not uniform and hardness of rare earth wear resistant steel plate BTNM450 of Baotou Steel does not change significantly along the direction of section thickness, which is with excellent wear resistance.