Carbon steel round steel is a kind of alloy element with element as the main element, and also contains a small amount of manganese and silicon phosphorus, and its carbon content is usually between 0.15% and 0.75%. The main advantages of carbon steel round steel are good machinability, weldability, machinability and mechanical properties, and are widely evaluated in the fields of manufacturing machinery parts, bearings, auto parts, ship parts and so on.
The use of carbon steel round steel:
Carbon steel round steel has good mechanical properties and economy, and is widely used in the manufacture of various mechanical and engineering structural parts, such as bearings, gears, hinges, screws, nuts, bolts, etc.
Round bars can usually be divided into two categories: carbon steel round bars and alloy steel round bars, and then subdivided into cold-rolled round bars, hot-rolled round bars, cold-drawn round bars and reinforced steel, etc.
Carbon steel round steel is a round steel made of low carbon steel or ordinary carbon steel according to a certain process. The specifications and models of carbon steel round steel generally include Q195, Q235, Q345, #45 etc. Among them, Q195 means low carbon steel with a density of 7.85g/cm³; Q235 means low and medium carbon steel with a density of 7.85g/cm³; Q345 means medium carbon steel , the density is 7.85g/cm³; 45#, the density is 7.85g/cm³.
Alloy steel round steel is a kind of steel with special properties, mainly titanium, chromium, Tantalum, nickel, aluminum, manganese and other metal elements obtained through special quenching, tempering and other processes, with corrosion resistance, wear resistance, With the advantages of strength resistance and high thermal stability, it is commonly used in petroleum, chemical, military, aerospace and other industries. Its specifications and models include 20Cr, 35Cr, 40Cr, 45Cr, 50Cr, etc., of which 20Cr means steel with good quenching performance, and its yield strength It is more than 3 times that of carbon steel; 35Cr means high-strength steel, whose yield strength is 3-5 times that of carbon steel; 45Cr means high-strength steel, whose yield strength is 5-7 times that of carbon steel; 50Cr means high-strength steel, whose yield strength It is more than 7 times that of carbon steel.
There is also a kind of special round steel cold drawn round steel, which refers to the round steel processed by cold drawing of ordinary carbon steel, which has the advantages of high strength, good plasticity and corrosion resistance, and is often used in the manufacture of building components and forgings, etc. The specifications and models include 20#, 35#, 45#, 50#, 60#, etc., of which 20# means low carbon steel with a carbon content of 0.17-0.23%; 35# means low and medium carbon steel with a carbon content of 0.3-0.38% ;45# means medium carbon steel with carbon content of 0.42-0.5%; 50# means medium carbon steel with carbon content of 0.5-0.59%; 60# means high carbon steel with carbon content of 0.6-0.7%.
In addition, there is a special type of round steel reinforced steel. It is also called high-strength reinforced steel. It is a kind of semi-soft steel. It is made of ordinary carbon steel through a large amount of cold drawing. Its bending strength, wear resistance, impact strength and other properties exceed ordinary steel. It is commonly used Used in automobile steel wheels, pipe bows and ribs, etc. Its specifications and models include HRB60, HRB70, etc., where HRB60 means high-strength reinforced steel with a bending strength of more than 60Mpa; HRB70 means high-strength reinforced steel with a bending strength of more than 70Mpa
Executive standard of carbon steel round bar:
1. GB/T 699-2015 “High quality carbon structural steels”.
2. ASTM A108-13A “Standard Specification for Steel Bar, Carbon and Alloy, Cold-Finished”.
3. JIS G4051-2009 “Carbon Steels for Machine Structural Use”.
4. EN 10083-2-2006 “Steels for Quenching and Tempering Part 2: Technical Delivery Conditions for Non Alloy Steels”.
Among the above standards, GB/T 699 is the steel quality standard promulgated by my country, which is applicable to various steel products such as stainless steel and alloy steel, including carbon steel round steel. ASTM A108 is a carbon steel round steel standard formulated by the United States, which is suitable for the manufacture of mechanical parts and bearings. JIS G4051 is a carbon steel round bar standard formulated by Japan, which is suitable for carbon steel and bearing steel for mechanical structures. EN 10083-2 is a carbon steel round bar standard formulated in Europe, which is suitable for the manufacture of various engineering structural parts and mechanical parts.
