Seamless carbon steel pipes are made of steel ingots or solid billets through perforation to make capillaries, which are then hot-rolled, cold-rolled or cold-drawn. The raw material of carbon Steel Pipe is a round tube blank, which is cut by a cutting machine into a billet with a length of about 1 meter, and sent to a furnace for heating through a conveyor belt. The billets are fed into the furnace and heated at about 1200 degrees Celsius. The fuel is hydrogen or acetylene. Furnace temperature control is a critical issue. After the round tube blank is released from the furnace, it is pierced through a pressure punching machine. Generally, the more common punching machine is the conical roller punching machine. This kind of punching machine has high production efficiency, good product quality, large amount of perforation and diameter expansion, and can wear a variety of steel grades. After perforation, the round tube blank is successively cross-rolled, continuously rolled or extruded by three rolls. Carbon Steel Tube, Mild Steel Pipe, Hot Rolled Steel Pipe, Weld Steel Pipe Shandong Guanzhou Iron and Steel Group Co., Ltd. , https://www.guanzhouiron.com
The free breaking length of ultra-high strength polyethylene fiber in water is infinite. Under the same thickness, the maximum quality it can withstand is 8 times that of steel wire rope. It is the third generation of ultra-high strength after carbon fiber and aramid fiber. Intensive fiber has an irreplaceable role in the military industry and aerospace industry. Its most important function is bullet-proof and stab-resistant. The quality of body armor made of it is much lighter than traditional body armor and its strength is high. Since 2002, China has applied this ultra-high strength fiber to the recovery system of the "Shenzhou" spacecraft and achieved good results.
It is understood that Donghua University's research group for the ultra-high strength polyethylene fiber industry has conducted research on jelly spinning technology simultaneously with the world. In 1985, the research group began to study basic theory, gradually cracked down on a series of technical problems such as jelly spinning technology, extraction technology and extraction equipment, and nanoparticle use technology. It has obtained 6 invention patents in some key technical fields. Walking in the forefront of the world.
1. Seamless steel pipe for structure (GBT8162-2008). Mainly used for general structure and mechanical structure. Its representative material (brand): carbon steel, 20, 45 steel; alloy steel Q345, 20Cr, 40Cr, 20CrMo, 30-35CrMo, 42CrMo, etc.
2. Seamless steel pipes for conveying fluids (GBT8163-2008). It is mainly used for conveying Fluid Steel Pipe in engineering and large-scale equipment. The representative material (grade) is 20, Q345, etc.
3. Seamless steel pipes for low and medium pressure boilers (GB3087-2008) are used to manufacture various structures of low and medium pressure boiler superheated steam pipes, boiling water pipes and superheated steam pipes, large smoke pipes, small smoke pipes and arch bricks for locomotive boilers Hot-rolled and cold-drawn (rolled) seamless steel pipes of high-quality carbon structural steel for pipes. The representative material is 10, 20 steel.
I become one of the top three global super strength polyethylene fibers
Ultra-high-strength polyethylene fibers used to have only two countries, the Netherlands and the United States, with their own independent intellectual property rights. The global annual output is only 8,000 tons, which is a scarce material in the world. China is now the third country to produce, with an annual output of 1,000 tons. This scientific research achievement developed by Donghua University’s Chemical Fiber Research Institute won the first prize of Shanghai’s Science and Technology Progress Award this year.