Year1
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Nokia Siemens Company [Medium-thick plates, strips, steel wires, square bars, flat steel, hexagonal bars, complete specifications, special specifications can be customized]
Our company operates imported spring steel brands, introduces spring steel wire prices, spring steel plates, chemical composition Performance and uses of spring steel strip Spring steel round rod wholesaler Imported spring steel strip specifications Introduction Imported spring steel wire material certificate Imported spring steel specifications Factory direct sales Imported spring steel grade comparison table Carbon spring steel manufacturer Alloy spring steel Japan imported spring steel manufacturer American Fencola spring steel seller, Japanese Sumitomo spring steel, exclusive agent for spring steel imported from Germany, etc. The brands are as follows
Japanese spring steel
Korean spring steel
Swedish spring steel
British spring steel
German Spring Steel
International Standard Spring Steel?
American Spring Steel
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Chinese Spring Steel
[Guangdong Dongguan Nuoxi Spring Steel Spot size introduction】
Spring steel wire spring steel rod
Steel strip specifications and thickness
Small steel plate specifications and thickness
Large steel plate specifications, thickness and length
Hard material steel strip The surface can be polished to blue or yellow.
Nokia Siemens specializes in supplying and wholesale importing and exporting spring steel products with high precision, good wear resistance, good toughness, strong quality and stable quality.
[Introduction to the uses of Nuoxi 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.
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 and rulers
Stainless spring steel is a special material for stainless steel slitting blades
Spring steel is a special material for blade knives/
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Spring steel is a special material for hairpins/
Spring steel is used for construction spatulas. Special material
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 Nuoxi 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: ﹑, ﹑, ﹑. 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 10%, a chromium content of 10%, and a vanadium content of 0.0% has high hardenability and low overheating sensitivity. When the plasticity index is similar, the tensile strength and yield strength are higher than those of silicon-manganese spring steel. Mainly Used to make springs that can withstand high stresses.
Tungsten-containing spring steel has a tungsten content of 1. Like steel, it can be used to make springs that can withstand high loads and are heat-resistant (≦) and impact-resistant. The 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 (reducing service life) is heated by a salt bath furnace or a controlled atmosphere heating furnace. Using rapid heating process.
After quenching, the hardness is insufficient and there is a large amount of non-martensite and ferrite appears in the core (generation and residual deformation reduces the service life). Choose materials with better hardenability. Improve the cooling capacity of quenching coolant. The temperature of the spring entering the coolant should be controlled above. Properly increase the quenching heating temperature.
Overheating (increased brittleness) Strictly control the forming and quenching heating temperatures. Strengthen metallographic inspection during quenching.
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Cracking (increased brittleness seriously reduces service life) controls the quenching heating temperature. When it is cooled down during quenching, take it out for air cooling. 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 temperatures. 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.
Asothermal quenching of springs For springs with small diameters or sufficient permeability, aisothermal quenching can be used. It can not only reduce deformation but also improve strength and toughness. It is best to perform tempering after austempering to improve the elastic limit recovery. The fire temperature is the same as the austempering temperature.
Relaxation treatment of springs When the spring works under the action of external force for a long time, a small 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, which reduces the accuracy of the spring. This 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 the deformation amount exceeds the deformation amount that may occur when the spring is working. Then heat and keep warm at a temperature higher than the operating temperature.
Low-temperature carbonitriding uses a process that combines tempering with low-temperature carbonitriding (soft nitriding) to 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, oxidation, and decarburization often become stress concentration areas and sources of fatigue fracture when the spring is working. 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 improving the fatigue strength and service life of the spring.
【Operation Precautions】
Check the surface for defects such as decarburization cracks before heat treatment. These surface defects will seriously reduce the fatigue limit of the spring.
Special attention should be paid to quenching and heating to prevent overheating and decarburization, and salt bath deoxidation should be done to control the furnace gas atmosphere and the heating temperature and time should be strictly controlled.
In order to reduce the deformation of the spring, the furnace is installed in the form of a fixture during heating and the cooling method is quenched during cooling.
After quenching, tempering should be carried out as soon as possible and the heating should be carried out as evenly as possible. Rapid cooling after tempering can prevent temper brittleness and cause surface compressive stress to 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 scales.
Surface decarburization will significantly reduce the fatigue strength of the spring. The depth of the decarburization layer should be tested according to regulations.
After heat treatment
Observe the spring watch with the naked eye or a low-power magnifying glass. There should be no cracks, corrosion pits and severe quenching deformation.
Hardness and 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 troostite and sorbite.
After the leaf spring is assembled, permanent deformation and static load deflection tests under working load are usually performed.
[Noxi manufacturer produces and wholesales domestic piano wire/In addition, in order to facilitate customers to purchase imported high-quality piano wire at the first time, our company has now sold agents to import the United States, Japan, South Korea, and Germany piano wire series. Direct sales from manufacturers at favorable prices, independent inventory, large quantities of ready stock, welcome new customers Old customers come to buy】
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