Quality carbon structural steel 20Mn - 60Mn

Product Name: High quality carbon structural steel

Grade: 08-70

Size (mm): Thickness T: 10 - 6 0; Width W: 1800-2700; length L: 6000-12700

Executive Standard: GB  T 711 - 200 8

Product Scope:

For the manufacture of steam turbines, compressors, pumps the moving parts; also replace infiltration steel gears, shafts, piston pins and other parts

Definitions

The steel contains, in addition to carbon (C) is a deoxidation element and a certain amount of silicon (Si) (not more than 0.40%), manganese (Mn) (generally not more than 0.80% to 1.20% may be higher) alloying elements, the without other alloying elements (except for residual elements). Such steel must also ensure the chemical composition and mechanical properties. The sulfur (S), phosphorus (P) content of impurity elements is generally controlled 0.035% or less. If the controls were called at 0.030% high quality steel, which should be added behind grade "A", for example, 20A; controlled if P 0.025%, S 0.020% or less controlled, called premium-quality steel, the grade should be added back "E" to show the difference. For the other materials into the residual steel alloying elements such as chromium (Cr), Nickel (Ni), copper (Cu) in the general control of the content ofSome grades of manganese (Mn) content of 1.40%, referred to manganese.

Such adjustment is to rely on a carbon steel (C) an amount to improve the mechanical properties of the steel, and therefore, according to the level of carbon content, such steels can be divided into:

Low carbon - carbon content is generally less than 0.25%, such as 10, 20 steel;

Medium carbon - carbon content is generally between 0.25 to 0.60%, such as 35, 45 steel;

High carbon - carbon content is generally greater than 0.60 percent. Such is generally not used in the manufacture of steel pipe.

In fact, the carbon content between them and no clear boundaries.

Such a large steel production, uses a wider, more generally rolling (forging) made of round, square, flat and other profiles, plates and seamless steel pipe. Mainly used to produce general structure and mechanical structure parts and components as well as building structures and transmission fluid pipes. Depending on requirements, and sometimes need heat treatment (normalizing or quenching) after use.

Classification