Knowledge classification - bearing steel

Wire: at high speed wire rod rebar line profile: high beams channel steel angles square steel heavy rail steel h-beam round steel unequal Angle steel flat light rail steel six Angle steel heat-resistant steel gear round steel work round steel square tube carbon steel bearing steel carbon knot round steel stainless round steel bearing round steel type torque tube spring steel plate: the carbon plate container plate plate junction plate boiler plate low alloy plate pattern plate cold plate plate cold rolled plate hot rolled plate galvanized sheet electric galvanized sheet roll of manganese plate galvanized stainless steel plate silicon steel sheet width, caigang corrugated iron, galvanized rolled plate hot rolling strip steel pipe: welded pipe stainless steel tube hot dip galvanized tube cold galvanized pipe seamless pipe spiral pipe hot rolling seamless, ferrous metals, steel and non-ferrous metal in the introduction to the classification of steel before you make a brief introduction of the basic concept of ferrous metals, steel and nonferrous metals. 1, black metal refers to an alloy of iron and iron. Such as steel, iron alloy, cast iron, etc. Steel and cast iron is based on iron, add carbon as the main elements of the alloy, collectively known as the iron carbon alloy. Pig iron is put iron ore in the blast furnace smelting products, mainly used for steelmaking and manufacture of castings. Put the casting pig iron in the cupola melting, namely get cast iron ( Liquid) , the liquid cast iron is cast into the casting, the cast iron is cast iron pieces. Iron alloy is made up of iron and silicon, manganese, chromium, composed of elements such as titanium alloy, iron alloy is one of the steelmaking raw material, make steel in steelmaking deoxidizer and additive in alloy elements. 2, put the steelmaking pig iron according to certain processes in the furnace smelting, the steel. Steel ingot, casting billet and directly cast all kinds of steel castings, etc. Usually told by steel, generally refers to the steel rolled into a variety of steel products. Steel belongs to black metal but not completely equal to black metal steel. 3, non-ferrous metals is also called nonferrous metals, in addition to the black metal of the metal and alloys, such as copper, tin, lead, zinc, aluminum and brass, bronze, aluminum alloy and bearing alloy, etc. In industry also USES the chromium, nickel, manganese, molybdenum, cobalt, vanadium, tungsten, titanium, etc. , mainly used for the metal alloy addition, in order to improve the performance of the metal, tungsten, titanium, molybdenum, etc for production of cemented carbide cutting tools. These are called industrial metals, non-ferrous metal and precious metal: platinum, gold, silver and precious metals, such as including radioactive uranium, radium, etc. Second, the classification of steel is a carbon steel in 0. 04% - 2. 3% of iron carbon alloy. In order to guarantee its toughness and plasticity, the carbon content is generally not more than 1. 7%. The main elements in addition to iron, carbon steel, silicon, manganese, sulfur, phosphorus, etc. Steel classification method is varied, the main method has the following seven: 1, according to the quality classification ( 1) Ordinary steel ( P≤0。 045%,S≤0。 050%) ( 2) High quality steel ( P, S are 0 or less. 035%) ( 3) High quality steel ( P≤0。 035％，S≤0. 030%) 2. Classified by chemical composition, 1) Carbon steel: a. Low carbon steel ( C≤0。 25%) ; b。 Medium carbon steel ( C≤0。 25 ~ 0. 60%) ; c。 High carbon steel ( C≤0。 60%) 。 ( 2) Alloy steel: a. Low alloy steel ( Alloy element content of total 5% or less) b。 Alloy steel ( Alloy element total content> 5 ~ 10%) c。 High alloy steel ( Alloy element total content> 10%) 。 Classification: (3, according to the forming method 1) Forged steel. ( 2) Cast steel; ( 3) Hot rolled steel. ( 4) Cold drawn steel. 4, according to the microstructure classification ( 1) Annealing state of a. Hypoeutectoid steel ( Ferrite + pearlite) b。 The eutectoid steel ( Pearlite) c。 Hypereutectoid steel ( Pearlite + cementite) d。 Ledeburite steel ( Pearlite + permeability body) 。 ( 2) Is the state of the fire: a. Pearlitic steel; b。 Bainite steel. c。 Martensitic steel. d。 Austenitic steel. ( 3) No phase change or part 5, classified according to the use of phase change of ( 1) Construction and engineering steel: a. Ordinary carbon structural steel; b。 Low alloy structural steel; c。 Reinforced steel. ( 2) Structural steel. Machinery manufacturing steel: ( a) Quenched and tempered steel; ( b) Surface hardened steel, including steel, surface quenching steel carburizing steel, ammonia; ( c) Free cutting steel. ( d) Cold plastic forming steel: including cold-formed steel, cold heading steel. b。 Spring steel c. Bearing steel, 3) Tool steel: a. Carbon tool steel. b。 Alloy tool steel. c。 High speed tool steels. ( 4) Special steel performance: a. Acid-proof stainless steel b. Heat resistant steel including oxidation heat intensity steel, steel, steel valve c. Electrothermal alloy steel; d。 Wear resistant steel; e. Cryogenic steel; f。 Electrical steel ( 5) Professional steel - — Such as Bridges with steel, ship steel, boiler steel, pressure vessel steel, agricultural machinery, steel, etc. 6, comprehensive classification ( 1) A common steel. Carbon structural steel: a) Q195; ( b) Q215( A、B) ; ( c) Q235( A、B、C) ; ( d) Q255( A、B) ; ( e) Q275。 b。 Low alloy structural steel c. Specific use of common structural steel ( 2) High quality steel ( Including high quality steel) 一个。 Structural steel: a) High quality carbon structural steel; ( b) Alloy structural steel; ( c) Spring steel. ( d) Free cutting steel. ( e) Bearing steel. ( f) Specific use high quality steel. b。 Tool steel: a) Carbon tool steel. ( b) Alloy tool steel. ( c) High speed tool steels. c。 The special performance of steel: ( a) Acid-proof stainless steel; ( b) Heat resistant steel; ( c) Electrothermal alloy steel; ( d) Electrical steel; ( e) High manganese steel wear-resisting. 7, according to the smelting method classification ( 1) According to the furnace of a. Open hearth steel: a) Acid open hearth steel; ( b) Basic open hearth steel. b。 Converter steel: a) Bessemer steel; ( b) Basic Bessemer steel. Or ( a) Bottom blowing converter steel; ( b) Side blown converter steel; ( c) Ld converter steel. c。 Electric steel: a) Electric arc furnace steel. ( b) Electroslag furnace steel. ( c) Induction furnace steel. ( d) Vacuum self-consuming furnace steel; ( e) Electron beam furnace steel. ( 2) According to the degree of DNA and gating system of a. Rimmed steel; b。 Half killed steel; Killed steel; d。 Special killed steel.