The purchasing pace at the demand end of the international thermal coal market continues to slow down and the international thermal coal price continues to decline. Prices for thermal coal at major international ports continued to fall last week as b
Ferric oxide is an inorganic substance with the chemical formula Fe3O4. It is a magnetic black crystal, so it is also called magnetic iron oxide. It is a commonly used magnetic material. Usually used as a pigment and polishing agent, it can also be u
Nickel-based superalloys are the most widely used. The main reason is that, one is that more alloying elements can be dissolved in the nickel-based alloy, and it can maintain good structural stability