Stainless Steel Bar chemical composition
What is the classification of steel by chemical composition
Steel is iron-based iron-carbon alloy. Silicon, manganese, sulfur, phosphorus is a common element in steel. Silicon, manganese is in the steel as a deoxidizer and deliberately added to the remaining in the steel. There is a certain amount of silicon, manganese content, the benefits of steel, if not it, steel can not be a good deoxidation, and steel mechanical properties will be reduced. Sulfur is in the iron from the ore and fuel into the molten iron, and then can not be completely removed, it remains in the steel. Generally speaking, sulfur, phosphorus on the mechanical properties of steel is harmful, should be strictly controlled. But easy to cut steel sulfur, phosphorus to increase the brittleness of steel to improve the cutting speed. Depending on the chemical composition, the steel can be divided into carbon steel, industrial pure iron and alloy steel.
Carbon steel: according to different carbon content is divided into: low carbon steel (carbon content less than 0.25%), carbon steel (carbon content of 0.25 ~ 0.60%), high carbon steel (carbon content greater than 0.60%). Carbon steel according to their own sulfur, phosphorus, how much is divided into ordinary carbon steel and high-quality carbon structural steel.
Ordinary carbon steel: ordinary carbon according to the technical conditions guaranteed, divided into Class A steel, B steel and special steel. Class A steel: only to ensure the mechanical properties of steel. The mechanical properties of ordinary steel usually refers to yield strength, tensile strength, elongation and cold bending and other four. But the two categories generally only guarantee the tensile strength, elongation two. With special requirements, yield strength, cold bending, etc. can be used as additional guarantee conditions. B steel: to ensure that the chemical composition, but does not guarantee the mechanical properties of steel. Special steel: that is to ensure that the mechanical properties and ensure the chemical composition of the steel. Ordinary carbon steel use, mainly for the general building materials, such as I-beam, channel, angle, steel and so on.
High-quality carbon structural steel: high-quality carbon structural steel and ordinary carbon steel, must also ensure that the chemical composition and mechanical properties, harmful elements sulfur, phosphorus and non-metallic inclusions less content, purity, uniformity and surface quality Are better. Therefore, its plasticity and toughness is better. This kind of steel is generally smelted in the open hearth or electric furnace, deoxidation is perfect, except that few kinds of steel can smelting into boiling steel, the rest are sedative steel. According to the different amount of manganese, high-quality carbon structural steel can be divided into ordinary manganese content and high manganese content of two categories. High quality carbon structural steel is mainly used for mechanical parts and tools, springs and so on. It is a large output, cheap, widely used, where the mechanical products of various sizes of structural components are widely used.
Industrial pure iron: carbon content of less than 0.040% of ordinary carbon steel is called industrial pure iron. Industrial iron is a magnetic material for electrical, telecommunications and electrical instrumentation. Alloy steel: alloy steel is based on carbon steel, in order to obtain some special requirements of the performance, in the smelting of some of the elements by adding one or several. Such elements are called alloying elements. According to the amount of alloying elements, alloy steel can be divided into low alloy steel, medium alloy steel and high alloy steel. Low alloy steel: Alloy alloy with a total content of less than 5% alloy steel is called low alloy steel. In the alloy steel: alloying elements in the total content of 5 to 10% of the alloy steel is called alloy steel. High alloy steel: alloying elements greater than 10% of the total content of alloy steel is called high alloy steel.