General hardware screws are made of low carbon steel.
Low carbon steel is carbon steel with a carbon content of less than 0.25%. It is also called mild steel because of its low strength, low hardness, and softness. It includes most of the ordinary carbon structural steel and a part of high-quality carbon structural steel, most of which are not heat treated for engineering structural parts, and some are carburized and other heat treatments for mechanical parts requiring wear resistance.
The low carbon steel annealed structure is ferrite and a small amount of pearlite, which has low strength and hardness, and good plasticity and toughness. Therefore, the cold formability is good, and cold forming can be performed by a method such as crimping, bending, or press. This steel also has good weldability. Low carbon steels with a carbon content ranging from 0.10% to 0.30% are easily accepted for various processes such as forging, welding and cutting, and are commonly used in the manufacture of chains, rivets, bolts, shafts, etc.
A screw is a tool that uses the physics and mathematical principles of the circular rotation of the object and the frictional force to gradually tighten the object. Screws are a general term for fasteners, everyday spoken language. Screws are indispensable industrial essentials in daily life: extremely small screws such as cameras, glasses, clocks, electronics, etc.;
general screws for televisions, electrical products, musical instruments, furniture, etc.; for engineering, construction, and bridges, large Screws and nuts; traffic appliances, airplanes, trams, cars, etc. are used for both size and size. Screws have an important task in the industry.
As long as there is an industry on the earth, the function of the screw is always important. Screws are the common inventions in people's production and life for thousands of years. According to the application field, it is the first invention of mankind.