In the process of regional metamorphism, with the increase of temperature and pressure, the metamorphism is deepened, and the silicate-alumina is metamorphosed into slate, phyllite, schist and gneiss. Therefore, phyllite has a higher degree of metamorphism than slate (generally a residual structure), is lower than schist (morphing structure), and lower than gneiss (granular crystal structure).
Slate - a metamorphic rock developed by slab-like cleavage dominated by mud and silty components. The original rock composition is clay rock, siltstone or medium-acid tuff, which is formed by regional low-temperature dynamic metamorphism. The slate is mainly composed of mineral particles or cryptocrystals, and the recrystallization is not developed, with obvious residual structure and structure. According to the impurity composition and color of the rock, it can be divided into sub-classes such as carbonaceous slate, calcareous slate, sandy slate and spot slate. The slate with dense structure and slab development can be used as building stone, stone and stone.
The schist - characterized by a phylogenetic structure, is a common regional metamorphic rock. The original rock has been completely recrystallized and consists of flakes, columns and granular minerals. Generally, it is a scale-like crystal structure, a fibrous crystal structure, and a patch-like crystal structure. Common minerals include mica, chlorite, talc, amphibole, and actinolite. Granular minerals are dominated by quartz, followed by feldspar.
Gneiss - gneiss is a kind of metamorphic rock, and it has a deep metamorphism. It has a ramie structure or a strip-like structure, and has scaly granular crystals. It is mainly composed of feldspar, quartz, mica, etc. Quartz content is greater than 50%, feldspar is more than quartz. If quartz is more than feldspar, it is called "schist" and no longer gneiss.
Stainless Steel Welded Round Pipe
Stainless Steel Pipe is a kind of hollow long round steel, which is widely used in petroleum, chemical, medical, food, light industry, mechanical instruments and other industrial pipelines and mechanical structural parts. In addition, when the bending and torsion strength are the same, the weight is lighter, so it is also widely used in manufacturing mechanical parts and engineering structures. It is also used for furniture, kitchenware, etc. The hardness of stainless steel pipe is usually measured by Brinell, Rockwell and Vickers. Annealed stainless steel pipe with inner diameter of more than 6.0 mm and wall thickness of less than 13 mm. Production process of stainless steel seamless pipe A. round steel preparation; b. Heating; c. Hot rolling perforation; d. Cutting head; e. Pickling; f. Grinding; g. Lubrication; h. Cold rolling; i. Degreasing; j. Solution heat treatment; k. Straightening; l. Pipe cutting; m. Pickling; n. Finished product inspection. Common materials are 201, 304 and 316.ETC
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