[Introduction to the uses of Xiangyun spring steel in Dongguan City, Guangdong Province]
Spring steel is a special material for clockwork
//
Spring steel is a special material for belt knives
Spring steel is special 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 and rulers
/< br/> Stainless spring steel is a special material for stainless steel strips and blades
Spring steel is a special material for blades and knives
Spring steel is a special material for hairpins
Spring steel is a special material for construction spatulas< br/> Spring steel is used as a special material for elastic pieces
Spring steel is used as a saw blade for sawing machines and other machines
Special material for saw blades
[Introduction to Dongguan Xiangyun 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, mainly in the case of impact, vibration and other dynamic loads or long-term periodic alternating stress. conditions. 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 used to make coil springs and torsion bars, and flat steel used to make leaf springs; cold-drawn steel includes round steel or trapezoidal steel used to make small-sized coil springs. Cold-drawn steel wire and cold-rolled steel strip for the manufacture of springs and various 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 categories: 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.
Pure manganese-containing spring steel such as >
, 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. China has two steel grades: >
and >
. >
Because it contains >
about chromium and manganese, it has high hardenability and small decarburization tendency. The disadvantage is that both chromium and manganese tend to increase temper brittleness and require rapid cooling after tempering. It is mostly used to manufacture larger and more important leaf springs and coil springs. >
Steel has good hardenability; adding vanadium can refine the structure and 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 alloying elements to >
steel, we can achieve better mechanical properties and hardenability than the above two spring steels. >
The silicon content is>
~>
, the chromium content is>
~>
, and the vanadium content is>
~>
>
Steel has high hardenability and low overheat sensitivity. When the plasticity index is similar, the tensile strength and yield strength are higher than silicon-manganese spring steel. It is mainly used to make springs that can withstand high stress. >
Tungsten-containing spring steel>
The tungsten content of the steel is >
>
. Like >
steel, it can be used to make high-load and heat-resistant spring steels. >(
≦>)
﹑Impact-resistant spring. 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 conditions below
. The production processes of the above-mentioned steels are more complex and the prices are higher. For springs working under high temperature conditions, heat-resistant steel and heat-resistant alloys can be used; for springs working in corrosive media, the corresponding brand should be selected according to the properties of the medium> (
Oxidability, reduction>)
of stainless steel.
[Common defects and preventive measures during spring quenching]
Decarburization> (
Reduced service life>)
Use a salt bath furnace or an atmosphere heating furnace for heating. >
Using rapid heating technology. >
Insufficient hardness after quenching>,
A large amount of non-martensite>,
Ferrite appears in the center> (
Generation and residual deformation>,
To reduce 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 >
. >
Appropriately increase the quenching heating temperature. >
Overheating> (
Increased brittleness>)
Strictly control the forming and quenching heating temperatures. >
Strengthen metallographic inspection during quenching. >
)
Cracking> (
Increased brittleness>,
Seriously reduced service life>)
, control the quenching heating temperature. >
When the quenching is cooled to >
,
take it out for air cooling. >
, temper in time.
[Measures to improve spring quality]
Deformation heat treatment>
Combine 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 diameter or sufficient permeability>,
it can not only reduce deformation>, but also improve Strong toughness>,
It is best to temper again after austempering>,
it can improve the elastic limit>,
The tempering temperature is the same as the austempering temperature. >
Relaxation treatment of springs>
Springs work under external force for a long time>,
As a result of stress relaxation, a trace amount of permanent stress>(
Plasticity>)
Deformation>,
Especially for springs working at high temperatures>,
The stress relaxation phenomenon is more serious at high temperatures>,
Reducing the accuracy of the spring>,
This is not suitable for general precision Springs are not allowed. Therefore>,
This type of spring should be relaxed after quenching>,
tempering>
Preload the spring>
to make the deformation exceed what is possible when the spring is working The amount of deformation produced. Then heat>,
keep warm>
at conditions higher than the working temperature>
. >
Low-temperature carbonitriding>
A process that combines tempering and low-temperature carbonitriding>(
soft nitriding>)
can be Significantly improve the fatigue life and corrosion resistance of the spring>,
This process is mostly used for coil springs. >
Shot peening>
Surface defects such as scratches, folds, oxidative decarburization, etc. often become stress concentration areas and fatigue fracture sources when the spring is working. If the surface of the spring is sprayed with fine steel shots at high speed>,
it not only improves the surface quality of the spring>,
increases the surface strength>,
and puts the surface in a state of compressive stress>,
Thereby improving spring fatigue strength and service life.
【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. >
Special attention should be paid to preventing overheating and decarburization during quenching and heating>,
Do a good job of salt bath deoxidation>,
Control the furnace gas atmosphere>,
Strictly control the heating temperature and time. >
In order to reduce deformation>,
How to install the spring in the furnace during heating>,
Clamp form and quenching cooling method during cooling. >
Tempering should be done as soon as possible after quenching>,
Heating should be spread as evenly as possible. Rapid cooling after tempering can prevent temper brittleness and cause 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 skin, etc. >
Surface decarburization will significantly reduce the fatigue strength of the spring>,
The depth of the decarburization layer should be inspected 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>, usually the permanent deformation and static load deflection tests under working load are also carried out.
[Xiangyun 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 and imported piano wire series from the United States, Japan, South Korea, and Germany. Factory direct sales with favorable prices, independent inventory, and large quantities of goods in stock. New and old customers are welcome to come and buy】
[Xiangyun] Purchase process
) Customers’ opinions on me The company has the intention to purchase steel products and inquires about our company's steel products. Our company conducts inquiries and quotes based on the steel types and specifications required by customers.
) After confirming the availability of goods and reaching an agreement with the customer on price, your company will fax your company's invoicing information and related materials to our company for filing. After delivery, our company will send you an invoice.
) Because customers are in different regions, logistics matters will be communicated with customers before delivery. Our company currently has two delivery methods: freight and express logistics. Customers can choose our company to arrange logistics according to their own circumstances, or they can solve it themselves.
) After the logistics is formed, our company will notify the customer to remit money through Alipay or the company's corporate account. (If you choose company-to-public account remittance, you must complete the corresponding operations before shipping. Our company will ship the goods to the customer immediately after confirming receipt of payment)
) After the customer receives the goods and has no other objections, our company will deliver the general taxpayer VAT invoice to the customer by express delivery within
working days.
) In the end, the entire transaction was successfully concluded and the corresponding after-sales service issues were assumed.
>Sales Department 1
, >
>Sales Department 2
, >
(Company Fax)
, >
>Sales Department 3
, >
(Mr. Wang)
,
>Sales Department 4
, >
(Miss Ouyang)
, < br/> Sales Department Five
,
>(Enterprise
, >
)
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