According to a data from Inner Mongolia Autonomous Region Coal Industry Bureau, as of the end of June, 67 coal mines in Inner Mongolia stopped production, accounting for 20.2% of the production of coal mines. According to the National Development and Reform Commission, the production and sales of coal in all provinces from January to July also showed that production and sales volume in Inner Mongolia doubled in July before, and coal output was 515 million tons, down 8.2% year-on-year; sales volume was 530 million tons, down 8% year-on-year.
In terms of coal prices, the pit price of Inner Mongolia 5500 kcal thermal coal has dropped from about RMB 405/ton at the beginning of the year to RMB 310/ton on September 9, and it has been reduced by RMB 100/ton in the three quarters, a decrease of 25%. .
Analysts said that since the beginning of this year, due to the continuing downturn in the macro economy, slow demand growth, overcapacity, high inventory levels, and continued impact of imported coal, the coal price has been declining.
According to an internal report of the Shenhua Group obtained by the reporter, when the price of 5,500 kcal thermal coal has fallen to 570-580 yuan/ton, Shenhua, China Coal Pingyi and Yitai still have more than one hundred yuan of profit, while Mengxi The large-scale mines in the region still have a profit margin of 10 to 40 yuan/ton. Large-scale coal enterprises have increased their production by horsepower, and they hope to "pay the price."
Although there are many types of tapping screws, they all have the following similarities:
(1) are generally made of carbonized carbon steel (accounting for 99% of total production). It can also be made of stainless steel or non-ferrous metals.
(2) The product must be heat treated. Carbon steel tapping screws must be carbonized and stainless steel tapping screws must be solution hardened. In order to make tapping screws to meet the requirements of the standard of mechanical properties and performance.
(3) The product surface hardness is high, the core toughness is good. That is, "soft inside strong outside". This is a major feature of tapping Screw performance requirements. If the surface hardness is low, it can not be screwed into the matrix; If the core toughness is poor, a twist will break, can not be used. So "inside soft outside steel" is self-tapping screw to meet the use of performance, very important requirements.
(4) The surface of the product needs surface protection treatment, generally electroplating treatment. Some product surface must be treated by phosphate (photostatting), such as wall panel self - tapping screws for photostatting.
(5) Production by cold heading process. It is recommended to use high-speed cold heading machine and high-speed wire rolling machine or high-speed planetary wire rolling machine. High speed is emphasized here to ensure product quality. Only the head of tapping screw produced by high-speed machine is well formed and the thread quality is high.
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