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The changes in coke consumption in the above countries fully reflect the development and changes in the country's steel industry, mainly in the iron-smelting sector. For example, Japan ’s coke consumption remained “strong” for a long period from 2000 to 2007, reflecting its status as a world ’s largest iron-smelting production system and the steady development of pig iron production in the context of the rapid development of the world ’s steel industry;

Coke consumption generally shows a downward trend, reflecting that its steel industry pays attention to the development of electric furnace steelmaking, and the overall consumption of coke in the ironmaking process gradually decreases. Further calculated the net exports / imports of the top ten coke consuming countries in the world from 2000 to 2007, as shown in Figure 4. It can be seen that among the top ten coke consumer countries, except Poland, which is a net exporter, the remaining nine countries are all net importers, and some countries even import large quantities.

The above phenomena all indicate that for the world's major steel-producing countries, coke resources are showing greater scarcity, and this scarcity is becoming more and more obvious. III. Production analysis of the world's major coke producers In other major steel producing countries and regions except China, about 90% of coke production capacity is distributed within the steel companies. Therefore, the world's major coke companies are the major steel companies. The following uses Arcelor-Mittal and American Steel as examples for analysis. 1.

However, we can optimize the angle of the tool, select materials and improve the structure of the ordinary coating on the basis of the ordinary tool. To a certain extent, it can still be applied in graphite processing. The geometric angle of diamond-coated tools is different from that of ordinary coated tools. Therefore, when designing diamond-coated tools, due to the particularity of graphite processing, the geometric angle can be appropriately enlarged and the chip flute can also be enlarged without Reduce the wear resistance of cutting edge. For the ordinary TiAlN coating, although its wear resistance is significantly improved compared to uncoated tools, compared with diamond coating, the geometric angle of graphite should be appropriately reduced when processing graphite to increase its wear resistance Sex. For diamond coatings, many coating companies in the world have invested a lot of manpower and material resources to research and develop related technologies.
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