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Boyang Company [medium and thick plates, plates, strip steel, steel wire, yuan bars, square bars, flat steel, hexagonal bars, complete specifications, special specifications can be customized 】
Our company operates: Introduction to imported spring steel brands, spring steel wire price trends, chemical composition of spring steel plates, properties and uses of spring steel strips, wholesalers of spring steel round bars, introduction to specifications of imported spring steel strips, imported spring steel wires Material certification, imported spring steel specifications factory direct sales, imported spring steel grade comparison table, carbon spring steel manufacturers, alloy spring steel, Japanese imported spring steel manufacturers, American Fencola spring steel sellers, Japanese Sumitomo spring steel exclusive agents , spring steel imported from Germany and other brands are as follows:
Japanese spring steel
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International standard spring steel?-,
American spring steel
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China Spring Steel-
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[Guangdong Dongguan Boyang Spring Steel Spot Size Introduction:]
Spring Steel Wire:. Spring Steel Rod:
Steel strip specifications: Thickness from .width
Small steel plate specifications: Thickness: .Width:
Large steel plate specifications: Thickness: .Width: - Length:
Hard material steel strip surface Can be polished, blued, or yellowed.
Professional supply and wholesale import and export of spring steel products with high precision, good wear resistance, strong toughness and stable quality.
[Introduction to the uses of Boyang spring steel in Dongguan City, Guangdong:]
Spring steel is a special material for clockwork springs
Spring steel is a special material for belt knives/
Spring steel is a special material for textile accessories. Material
Spring steel is a special material for sinkers
Spring steel is a special material for ink scrapers
Spring steel is a special material for auto parts
Spring steel is a special material for surgical blades
Spring Steel is a special material for razor blades
Spring steel is a special material for disc saws
Spring steel is a special material for valves
Spring steel is a special material for steel rulers
Stainless steel Spring steel is a special material for stainless steel strips and blades
Spring steel is a special material for blades and knives:
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Spring steel is a special material for hairpins
Spring steel is a special material for construction spatulas
Spring steel is used as a special material for elastic pieces
Spring steel is used as a special material for saw blades/saw blades in sawing machines and other machines
[Introduction to Guangdong Dongguan Boyang spring steel series:]
Used to make springs or Steel parts with similar spring properties. It has high elastic limit, fatigue limit (especially notch fatigue limit) and certain impact toughness and plasticity. It is mainly used under the conditions of impact, vibration and other dynamic loads or long-term periodic alternating stress. Therefore, springs working in various states must have good surface quality and high fatigue resistance. In terms of process performance, spring steel that needs to be quenched and tempered should have a certain degree of hardenability, be difficult to decarburize, have low overheat sensitivity and high plasticity, and be easy to form in a hot state. The steel wire used to make small-size springs must have uniform hardness and a certain degree of plasticity.
Category Spring steel can be divided into hot-rolled spring steel and cold-drawn (rolled) spring steel according to the production method. Hot-rolled spring steel includes round steel or trapezoidal steel for manufacturing coil springs, torsion bars and flat steel for manufacturing leaf springs; cold-drawn (rolled) spring steel includes cold-drawn steel wire for manufacturing small-size coil springs and manufacturing springs and various Cold rolled steel strip for leaf springs. Alloy spring steel usually contains manganese, silicon, chromium, molybdenum, tungsten, vanadium and trace amounts of boron. These alloying elements can improve the hardenability of the steel. Manganese and silicon are solid dissolved into the ferrite, which can improve the yield strength. Chromium, tungsten and vanadium can improve the elastic limit, yield ratio and heat resistance of steel. According to the alloy elements contained, commonly used spring steel can be divided into the following types:
Carbon spring steel is cheap and widely used. If the surface state and heat treatment structure are the same, the fatigue limit is not lower than that of alloy spring steel. The disadvantage is that the hardenability and yield strength are low; springs with larger cross-sections cannot be quenched through oil quenching and are prone to cracking during water quenching. If the carbon content is increased, although the strength and elastic limit can be increased, the impact toughness and plasticity will be reduced, especially the low temperature toughness. China's carbon spring steel has four steel grades: ﹑﹑﹑﹑.
For example, pure manganese-containing spring steel, the manganese content is...~. Increasing the manganese content can improve the hardenability and strength of steel and reduce the tendency of decarburization. The disadvantage is that it has overheating sensitivity and temper brittleness, and is prone to quenching cracks, so it is only suitable for manufacturing various small-sized flat springs and round springs. .
Silicon-manganese spring steel is the main type of hot-rolled alloy spring steel. There are four steel grades in China: ﹑, ﹑, ﹑3. The silicon content is .~., and the manganese content is .~. Adding silicon to steel can significantly increase the elastic limit and yield-to-strength ratio, and improve tempering stability; however, it is easy to form inclusions such as silicate and increase decarburization sensitivity. When the carbon and silicon contents in steel are both high, carbon is prone to graphitization. This type of steel is widely used in the production of shock-absorbing leaf springs and coil springs on automobiles, tractors, and locomotives, as well as springs that are required to withstand higher stresses.
Chromium-containing spring steel is very common internationally, and China has two steel grades: and. Because it contains approximately chromium and manganese, it has high hardenability and little tendency to decarburization. The disadvantage is that both chromium and manganese tend to increase temper brittleness. They need to be cooled quickly after tempering. They are mostly used to make products with larger cross-sections and Important leaf springs and coil springs. Steel has good hardenability; adding vanadium can refine the structure, prevent overheating, improve the strength and toughness of steel, and reduce notch sensitivity. This kind of steel has little decarburization tendency, good low-temperature impact toughness, and relatively stable performance when working at higher temperatures. It is mainly used to manufacture valve springs, safety valve springs and springs working at higher temperatures. By appropriately adding other alloy elements on the basis of steel, better mechanical properties and hardenability can be achieved than the above two spring steels.
Steel with a silicon content of .~., a chromium content of .~., and a vanadium content of .~. has high hardenability and low overheating sensitivity. When the plasticity indicators are similar, the tensile strength and yield The strength is higher than silicon-manganese spring steel, and it is mainly used to make springs that can withstand high stress.
The tungsten content of tungsten-containing spring steel is .~., like steel, it can be used to make springs that can withstand high loads and are heat-resistant (≦3) and impact-resistant. 3 steel with a higher alloy content is a high-strength, heat-resistant spring steel with high hardenability. It is mainly used to manufacture control valve springs used under lower conditions. The production processes of the above-mentioned steels are more complex and the prices are higher. Springs working under high temperature conditions can choose heat-resistant steel and heat-resistant alloys; springs working in corrosive media should use corresponding grades of stainless steel according to the properties of the medium (oxidation, reduction).
[Common defects and preventive measures during spring quenching:]
Decarburization (reduce service life), use salt bath furnace or heated atmosphere heating furnace. , using rapid heating technology.
After quenching, the hardness is insufficient, there is a large amount of non-martensite, and ferrite appears in the core (generation and residual deformation, reducing service life), so choose materials with better hardenability. , Improve the cooling capacity of quenching coolant. The temperature of the coolant entering the spring should be controlled above r3. , Properly increase the quenching heating temperature.
Overheating (increased brittleness), strict control of molding and quenching heating temperatures. , Strengthen metallographic inspection during quenching.
) Cracking (increased brittleness, seriously reducing service life), control the quenching heating temperature. , when it is cooled down during quenching, take it out and cool it in air. Temper in time.
[Measures to improve spring quality:]
Deformation heat treatment combines the deformation strengthening and heat treatment strengthening of steel to further improve the strength and toughness of steel. Deformation heat treatment can be divided into high, medium and low temperature. High-temperature deformation heat treatment is quenching immediately after deformation in the austenite state. It can also be combined with forging or hot rolling, that is, quenching immediately after hot forming. Deformation heat treatment has been used in the production of automobile leaf springs.
Isothermal quenching of springs Isothermal quenching can be used for springs with small diameters or sufficient permeability. It can not only reduce deformation, but also improve strength and toughness. It is best to perform tempering again after isothermal quenching. To increase the elastic limit, the tempering temperature is the same as the austempering temperature.
Relaxation treatment of springs When springs work under the action of external force for a long time, a trace amount of permanent (plastic) deformation will occur due to stress relaxation. Especially for springs working at high temperatures, the stress relaxation phenomenon is more serious at high temperatures, causing The accuracy of the spring is reduced, which is not allowed for general precision springs. Therefore, this type of spring should be relaxed after quenching and tempering, and the spring should be preloaded so that its deformation exceeds the deformation that may occur when the spring is working. Then heat and keep warm at a temperature higher than the working temperature.
Low-temperature carbonitriding uses a process that combines tempering with low-temperature carbonitriding (soft nitriding), which can significantly improve the fatigue life and corrosion resistance of springs. This process is mostly used for coil springs.
Surface defects such as shot peening scratches, folds, oxidative decarburization, etc. often become stress concentration areas and sources of fatigue fracture during spring operation. If the surface of the spring is sprayed with fine steel shots at high speed, it will not only improve the surface quality of the spring, increase the surface strength, but also put the surface in a state of compressive stress, thereby increasing the fatigue strength and service life of the spring.
[Operation Precautions:]
Check the surface for decarburization, cracks and other defects before heat treatment. These surface defects will seriously reduce the fatigue limit of the spring.
During quenching heating, special attention should be paid to preventing overheating and decarburization, deoxidizing the salt bath, controlling the furnace gas atmosphere, and strictly controlling the heating temperature and time.
In order to reduce deformation, the spring is installed in the furnace during heating, the clamp form and the cooling method are quenched during cooling.
After quenching, tempering should be carried out as soon as possible, and heating should be carried out as evenly as possible. Rapid cooling after tempering can prevent temper brittleness and surface compressive stress, and improve fatigue strength.
Quality inspection?
Before heat treatment:
The rolling surface of steel is often the surface after being made into springs, so there should be no cracks, folds, scars, hair lines, bubbles, interlayers and Pressed oxide scale, etc.
Surface decarburization will significantly reduce the fatigue strength of the spring, and the depth of the decarburization layer should be tested according to regulations.
After heat treatment:
When observing the spring watch with the naked eye or a low-power magnifying glass, there should be no cracks, corrosion pits and severe quenching deformation.
The hardness and its uniformity comply with regulations. During mass production, it is allowed to use a file to randomly check the hardness, but it must be noted that the position of the file mark should not affect the final accuracy of the spring.
The metallographic structure should be troostite or a mixed structure of trostenite and sorbite.
After the leaf spring is assembled, permanent deformation and static load deflection tests under working load are usually carried out.
[Boyang manufacturer produces and wholesales domestic piano wires/In addition, in order to facilitate customers to purchase imported high-quality piano wires as soon as possible, our company has now sold and acted as an agent to import piano wire series from the United States, Japan, South Korea, and Germany, with factory direct sales at preferential prices. , independent inventory, a large amount of ready stock, welcome new and old customers to come and buy】
C100S heat treated valve carbon steel strip