Hebei Hankai hub seals by size

In the manufacturing sector, high temperature oil seals are used in machinery that processes materials at high temperatures, such as extruders and injection molding machines. In the oil and gas industry, they play an essential role in ensuring the reliability of pumps and compressors operating in high-temperature environments. These seals are also utilized in power generation systems where steam and thermal energy processes involve significant temperature fluctuations.

Most of these features, which used to be unique to iron, are now available in steel, which is by a large margin the superior material. And visually, the only difference between the two is the texture. Steel is smooth, while iron has a visible grain, whether it is produced by casting, or by pulling. This grain is actually caused by impurities in the iron and is what accounts for its unreliable nature. These impurities cause weak points in the iron that can lead to breakage when it’s put under stress. Steel’s smooth appearance results from the fact that these impurities have been burned out, or, in the case of carbon, evenly distributed throughout the material. When you think of the medieval blacksmith hammering away, what he is doing is distributing the carbon evenly to turn iron into steel.

Moreover, real spears have found their place in contemporary societies, often celebrated in sports, arts, and reenactments. Javelin throwing, for example, is an Olympic sport that pays homage to the spear in its athletic form. Meanwhile, historical reenactors and martial artists study traditional spear techniques, preserving the knowledge and skills of ancestors for future generations. This blend of history and modernity illustrates the enduring legacy of the spear across time.