Type and classification of steel

Iron and steel is a key material supply that can not be lacked in China's basic construction and the completion of the four modernizations. It is widely used and has various types. According to the different cross-section appearance, steel is generally divided into aluminum profiles, plates, pipe fittings and metal manufacturing four major categories. It is also divided into heavy rail, light rail station, large and medium-sized steel, medium channel steel, small and medium-sized steel, cold drawn steel, heat-resistant cast iron, cable, hot rolled strip, sheet metal, welder ferrite core, nylon belt, seamless steel pipe, welded steel pipe, metal manufacturing and other types.

Building decoration materials - threaded steel, stainless steel wire, stainless steel wire tray, garden steel. Pipe - seamless steel pipe, welded steel pipe. Cold rolled sheet/coil, hot rolled strip, color coated steel plate (galvanized steel plate, color coated steel plate, tin plate, hot coated aluminum zinc), silicon steel sheet, nylon strip. - - Angle, H - section steel, square steel pipe, galvanized flat steel, ball flat steel. Unique steels include alloy structural steel, alloy steel, die steel, spring steel, 45 steel, cold drawn steel, hard stainless steel wire. Steel is an alloy of iron and carbon with a carbon content near the middle. In order to ensure its ductility and plastic deformation, the carbon composition is generally not more than. In addition to iron and carbon, steel also has silicon, manganese, sulfur, phosphorus and other elements.

According to the forming type: (1) forged steel; (2) stainless steel castings; (3) hot rolled steel; (4) cold drawn steel.

Four is classified according to the alloy composition, quenching conditions are: a. subeutectoid (ferritic + ferritic); b. eutectoid (ferrite); c. Hypereutectoid steel (ferritic + cementite); d. Laite steel (ferrite + cementite). Five is classified by main use.

Construction steel: a. general carbon steel; b. Low alloy tool steel; c. Building reinforcement steel. Nitriding steel: a. high frequency hardening steel; b. Steel for induction hardening; c. All alloy structural steel; d. Steel for cold plastic deformation forming: including cold die steel and cold rolling steel. Carbon alloy steel; a. Alloy tool steel; b. High speed tool steel. Steel highway Bridges, steel ships, steel heating furnaces, steel high-pressure vessels, steel farm trucks, etc. Sixth, comprehensive classification. Refined iron (including high quality high-grade steel)(a) tempered steel; (b) alloy tool steel; (c) High speed tool steel. Steel with special characteristics: (a) stainless steel acid resistant steel; (b) heat-resistant steel; (c) electrically heated carbon steel; (d) Welding steel; (e) medium carbon steel. Classification is carried out according to smelting mode.