The basic organization of the steel material_Steel Pipe knowledge_News

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serial number	The Name	meaning
1	grains and grain boundaries	metal crystals, formed after the inconsistency, the internal character of arrangement in the same direction of the small crystals, called grains. The interface between the grain and grain, called grain boundaries.
2	phase and the phase boundary	metal or alloy, where the composition is the same, the same structure and the interface separated from each other part of, called phase. The interface between the phase and phase, called phase boundary.
3	solution, the body	crystal composed of a metal alloy elements dissolved in the solid phase formed by the atoms of another element, called a solid solution. Solid solution generally have high strength, good ductility, corrosion resistance and high resistivity and magnetic properties.
4	metal, compounds	alloy in atoms of different elements interact to form a lattice type and performance is completely different from its constituent elements, the metallic properties of solid-state phase, known as metal compounds.
5	the Austenitic	austenite carbon and other elements dissolved in the y-Fe solid solution. Austenitic face-centered cubic crystal, plastic, usually at high temperatures exist.
6	, ferritic	carbon and other elements dissolved in the a-Fe solid solution. Ferrite with bcc lattice, the minimal carbon content is very similar to its performance and pure iron, also known as pure iron body.
7	cementite,	cementite is a compound of iron and carbon, also known as the to carbonation three iron (№ c), the carbon content of 6.69%, with a complex character structure. Its performance is hard and brittle, and almost no plastic.
8	the pearlite	pearlite ferritic and lamellar cementite and white organizations. Because of their microstructure, named by the fingerprint-like luster of pearls. Performance between the ferrite and cementite, strength, hardness, and has good ductility and toughness.
9	, sorbitic	also known as fine pearlite is a mixture of austenite below the pearlite formation temperature decomposition of ferrite and cementite. Its lamellar pearlite is fine, only under a powerful microscope to distinguish. Hardness, strength and impact toughness are higher than that of pearlite.
10	, troostite	also known as the fine pearlite below the pearlite from austenite formation temperature decomposition of a mixture of ferrite and cementite. Lamellar peso's body is more detailed. Its hardness and strength are higher than sorbite.
11	the bainite	the bainitic is supersaturated ferrite and cementite mixture. The bainite divided into upper bainite and lower bainite. Higher temperatures, the formation known as "upper bainite", was feathered; called bainite, acicular or bamboo-like formation in the lower temperature. Bainite and upper bainite compared to the higher hardness and strength, and to maintain a certain toughness and ductility.
12	the Martensitic	Martensite is usually refers to the carbon in a-Fe supersaturated solid solution. The hardness of martensite in the steel increased with increasing carbon content. The high carbon martensite hardness and brittle, low carbon martensite has a higher toughness. The highest hardness of the martensite in the austenite transformation products.
13	, ledeburite	carbon alloy in a eutectic structure. Of austenite and cementite at high temperatures; at low temperature (727 ° C), consists of pearlite and cementite. The carbon content of 4.3%, contains large amounts of cementite in the organization, so high hardness, ductility, toughness low.
14	fracture test	fracture organization is one of the hallmarks of the quality of steel. With the naked eye or lO-fold magnifying glass to check the fracture of the sample groove or break, known as the fracture test. From the fracture can be seen that the defects of the metal.
15	, pyramid car he shaved his head pattern test	steel car into a tower or ladder-shaped specimen, and then etching or magnetic particle method test hairline, referred to as the pyramid test.