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is due in the quenched and tempered condition of elastic,specially used in the manufacture of spring and spring steel. Resiliencedepends on the deformation of steel in the elasticity, that is within the scope of the regulations, the elastic deformation of the ability to bear a certain load, theload permanent deformation after removal does not appear. Spring steelshould possess excellent comprehensive properties, such as mechanical properties (especially the elastic limit, ultimate strength, yield ratio), sag resistance performance (i.e., anti sagging performance, also known as the anti relaxation property), fatigue performance, hardenability, physical and chemical properties of heat resistance, low temperature resistance, (oxidation, corrosion resistance etc.). In order to meet the performance requirements, spring steel has excellent metallurgical quality (high purity and uniformity), good surface quality (strict control of surface defects and decarburization), shape and sizeprecision.
According to GB/T 13304 "steel classification" standard, according to the basicproperties and use characteristics of spring steel, belonging to the mechanical structure with steel; according to the quality grade, which belongs to thespecial quality steel, which need to be especially strict quality control and performance of the steel in the production process. According to the Chinahabits, spring steel belongs to special steel, spring steel when makingtechnical requirements are relatively high, excellent technology directly determine the level of quality.
Classified according to chemical composition
According to the GB/T 13304 standard, spring steel for non alloy spring steelin accordance with its chemical composition (carbon spring steel) and alloy spring steel. Carbon spring steel
The carbon content of carbon spring steel (mass fraction) in general 0.62%~0.90%. According to the content of manganese is divided into generalmanganese content (mass fraction) (0.50%~0.80%) such as 65, 70, 85 andhigher manganese content (mass fraction) (0.90~1.20%), such as the 65Mnclass two.
Alloy spring steel
Alloy spring steel in carbon steel on the basis of appropriate, by adding one orseveral kinds of alloy elements to improve the mechanical properties ofhardened steel, permeability and other properties, the desired performance in order to meet the manufacturing all kinds of spring steel.
Alloy spring steel basic composition series, Si Mn spring steel, spring steel,silicon chromium chromium manganese spring steel, chrome vanadium springsteel, tungsten chromium vanadium spring steel etc.. Based on these series,with molybdenum, vanadium and boron alloy elements such as some brandsand join in order to improve the performance of some of its aspects.
In addition, also from other steel types, such as high quality carbon structuralsteel, carbon tool steel, high-speed tool steel, stainless steel, the choice of some grades of steel used as spring.
Classification according to the production processing method
The hot rolling (forging) steel hot rolling round steel, including Fang Gang, flat steel, steel plate, forging round steel, Fang Gang.
The cold drawing (rolling) steel wire, cold drawn steel strip, including material(cold drawn steel).
In accordance with the steel delivery status classification
The hot rolling (forging) steel
A. rolled (forging) delivery of steel after hot forming is made of spring, and then quenching and tempering treatment.
B. in annealing state of delivery by the cold formed steel spring, thenquenching and tempering treatment.
All the above should comply with the relevant state provisions of deliveryhardness.
The cold drawing (rolling) steel
A. steel wire
The lead bath isothermal quenching cold drawn steel wire (also called sendDeng de cold drawing steel wire spring) made only after low temperaturetempering, to eliminate stress.
The oil quenching and tempering steel cold drawn into required size,continuous heating, continuous oil quenching and tempering of lead. Springsteel wire made only for the bottom temperature of fire, in order to eliminate stress.
The cold drawn steel wire (i.e. without quenching and tempering steel)
A. to cold state of delivery.
B. with annealing, normalizing or tempering treatment delivery.
The above two kinds of delivery wire springs are needed after quenching and tempering treatment.
B. steel strip
The cold state of delivery is made of spring after low temperature tempering, to eliminate stress.
The quenched and tempered condition required delivery is made of springafter low temperature tempering, to eliminate stress.
The back fire delivery is made of spring after quenching and temperingtreatment needs
C. cold drawn steel
In the annealed state delivery after cold forming steel is made of spring, and then quenching and tempering treatment.
The other classification method
In addition to the above, there are a number of other classification methods,for example:
According to the conditions of delivery requirements can be divided according to the chemical composition (mechanical properties) delivery and press thehardenability of delivery.
According to the spring working conditions can be divided into static loadspring steel, subjected to impact load spring steel and high (low) temperaturespring and corrosion resistance of spring steel etc..
2 process performance
Spring in use shock and vibration or prolonged stress, so the requirements ofhigh tensile strength, high elastic limit, the fatigue strength of the spring steel.In the technology requirements of spring steel has certain hardenability, not easy removal, good surface quality carbon spring steel is carbon content of WC in the 0.6%-0.9% range of high-quality carbon structural steel. Alloy springsteel is mainly the Si Mn steel, their carbon content was slightly lower, mainly by increasing the silicon content of Wsi to improve performance; in addition toLuo, tungsten, vanadium alloy steel spring. In recent years, with ChinaResources, and according to the automobile, tractor design requirements of new technologies, develop new steel added boron, niobium, molybdenum and other elements in the Si Mn steel on the basis of the spring is extended service life, improve the quality of the spring.
Spring in use shock and vibration or prolonged stress, so the requirements ofhigh tensile strength, high elastic limit, the fatigue strength of the spring steel.In the technology requirements of spring steel has certain hardenability, not easy removal, good surface quality carbon spring steel is carbon content of WC in the 0.6%-0.9% range of high-quality carbon structural steel. Alloy springsteel is mainly of Si Mn steel
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