What material is used for the valve? What is the general material of engine valves? Especially the e

Intake valves are generally made of alloy steel.

The exhaust valve is generally made of heat-resistant alloy steel, and the valve shaft is often filled with metal sodium in order to cool down.

Main materials of valve steel: 42Cr9Si Cr10Si2Mo, 85Cr18Mo2N(X Cr21Mn9Ni4N(21-4N Cr23Ni8Mn3N(23-8N), GH4080A(80A Cr8Si Cr21Mn8Ni2N(21-2N Cr21Mn9Ni4Nb2WN, 61Cr21Mn10Mo1Nb1V1N, 5Cr21Mn9Ni4Nb2Wn ( 21-4NWNB CR9SI3, GH4080A, GH4751 and other gas valve steels, heat-resistant steel bars, forgings, plates, ring forgings, wire rods, and can be customized according to customer requirements.

The valve is made of 40Cr10Si2Mo medium carbon martensitic valve steel. Valve steel, also known as valve valve steel.

New grade: 40Cr10Si2Mo (GB T 1221-2007).

Old grade: 4Cr10Si2Mo

Standard: GB T 1221-1992

At the same tempering temperature, the strength of 40Cr10Si2Mo increases with the increase of quenching temperature, and the plasticity does not change much. 1000 -1050 quenching can meet the technical requirements.

At the same quenching temperature, the strength decreases as the tempering temperature increases. The plasticity increases, but tempered at the upper temperature of 780, and the strength can barely hit the technical requirements. At 740 plus or minus 10 tempered, the best performance.

40Cr10Si2Mo Chemical Composition:

Carbon C: Silicon Si:

Manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni:

Molybdenum MO: Mechanical Properties:

Tensile Strength b (MPa): Quenched and tempered, 885

Conditional yield strength MPA): quenched tempered, 685

Elongation δ5 (% quenched tempered, 10

Section shrinkage quenching and tempering, 35

Hardness: annealed, 269

Heat treatment specifications and metallographic structure:

Heat treatment specifications: 1) quenching, 1010 1040 oil cooling; 2) Tempering, 120 160 air cooling.

Metallographic structure: The tissue is characterized by a martensitic type.

Delivery status: generally delivered in the standard state of heat treatment, and the type of heat treatment is indicated in the contract; If not indicated, it will be delivered in a non-heat-treated state.

Summary. Hello, the material requirements for the intake and exhaust valves of the engine are high, and they are usually made of heat-resistant steel. A brief description is as follows:

The material of the intake valve. The intake valves are usually made of medium carbon alloy steel, such as chromium steel, nickel-chromium steel, chromium key steel, etc., and the intake valves with large thermal load are also made of heat-resistant alloy steel, such as silicon chromium steel.

The material of the exhaust valve. Because of the large thermal load, the general exhaust valve is made of heat-resistant alloy steel, such as silicon chromium steel, silicon chromium molybdenum steel, cinnamon chrome fierce steel, etc.

In order to save heat-resistant alloy steel, the exhaust valve head of some engines is made of heat-resistant alloy steel, and the rod part is made of chromium steel, and then the two are welded together, and a heat-resistant alloy steel cap is added to the tail.

What is the general material of engine valves? Especially the exhaust valves?

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Hello, the material requirements for the intake and exhaust valves of the engine are high, and they are usually made of heat-resistant steel. A brief description is as follows: The material of the intake valve.

The intake valves are usually made of medium carbon alloy steel, such as chromium steel, nickel-chromium steel, Yinhui large chrome key steel, etc., and the intake valves with large heat load are also made of heat-resistant alloy steel, such as silicon chromium steel. The material of the exhaust valve. Because of the large thermal load, the general exhaust valve is made of heat-resistant alloy steel, such as silicon chromium steel, silicon chromium molybdenum steel, cinnamon chrome fierce steel, etc.

In order to save the heat resistant alloy steel pin, the exhaust valve head of some engines is made of heat-resistant alloy steel, and the rod is made of chrome steel, and then the two are welded together, and a heat-resistant alloy steel cap is added to the tail.

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Hello, the role of the valve is specifically responsible for inputting air into the engine and expelling the exhaust gases after combustion. In terms of engine structure, it is divided into intake valves and exhaust valves. The function of the intake valve is to draw air into the engine and mix it with fuel for combustion; The function of the exhaust valve is to exhaust the exhaust gases after combustion and dissipate heat.

The valve is made up of the valve head and the rod. The temperature of the valve head is very high, the intake valve is 570 670K, the exhaust valve is 1050 1200K, and it also bears the pressure of the gas, the force of the valve spring and the inertia force of the transmission assembly, and its lubrication and cooling conditions are poor, requiring the valve to have a certain strength, stiffness, heat resistance and wear resistance. The intake valve is generally made of alloy steel, and the exhaust valve is made of heat-resistant alloy.

Sometimes, in order to save heat-resistant alloys, the exhaust valve head is made of heat-resistant alloy, and the rod part is made of chrome steel, and then the two are welded together.

The shape of the valve head is a flat top, a spherical top, and a flared top. Flat tops are generally used. The flat-top valve head has a simple structure, easy manufacturing, small heat-absorbing area, small Fengyu mass, and can be used for intake and exhaust valves.

The spherical top valve is suitable for exhaust valves, which have high strong side base bridge, low exhaust resistance and good exhaust gas elimination effect, but its heating area is large, the mass and inertia are large, and the processing is complex. The horn type has a certain streamlining to reduce intake resistance, but its head has a large heating area, which is only suitable for intake valves.

The valve cone angle is the angle of the valve sealing surface, generally 45 °, some are 30 °, CA1091 car 6102 engine. The 30° valve is considered to be the same lift, the valve is small, the valve through the end face is large, and the intake resistance is small, but because the valve head edge with a small taper is thinner, the stiffness is small, and the sealing and thermal conductivity are poor, so it is generally used for the intake valve. The thickness of the valve edge is generally 1 3mm to prevent damage from impact with the valve seat during operation or burned by high temperatures.

In order to reduce intake drag and improve cylinder intake efficiency, most engine intake valves are larger than exhaust valves. The used intake and exhaust valves are also of different colors.

The valve stem is cylindrical in shape, and the surface of the valve tube must be heat-treated and polished. The shape of the end of the valve stem depends on the fixing form of the valve spring, the commonly used structure is two halves of the lock plate to fix the spring seat, the end of the valve stem has a ring groove to install the lock plate, some are fixed with a lock pin, and the end has a hole for installing the lock pin.

Hope it helps!

The material of the engine valve is generally composed of austenitic material.

The exhaust valve is composed of three parts:

1. The big head is 21-4N austenite material, which adopts solution aging treatment, with a grain size of 6-9 grades, a hardness of more than 30HRC, and can work at about 850 for a long time.

Second, the head cone working surface surfacing cobalt-based alloy Stellitef has strong wear resistance, corrosion resistance, impact resistance and high creep strength at high temperatures, and the fiber is very important to the valve life.

3. Quenching treatment at the end of the small tip, with a hardness of 50hrcmin, effectively improves the impact pitting resistance of the small tip. The hardness is more than 600HV to ensure the wear resistance of the valve stem and improve the valve life.

The valve structure can be divided into intake valve cover calendar and exhaust valve. The role of the valve is to be responsible for inputting air into the engine and expelling the exhaust gases after combustion. The function of the intake valve is to suck air into the engine and mix it with fuel for combustion; The function of the exhaust valve is to exhaust the exhaust gases after combustion and dissipate heat.

The symptoms of car valve damage are as follows:

1. It will affect the working efficiency of the engine, and the power of the car will be reduced;

2. There will be abnormal noise, the engine will be unstable or unstable acceleration during operation, and the overtaking performance will also be reduced, and in serious cases, it will also lead to difficulty in starting the engine, the phenomenon of not igniting, and the car will also have air leakage or increased carbon deposits;

3. If the valve is broken, it will lead to unstable cylinder work, and unstable cylinder will cause the engine to shake, the engine will work weakly, and it will also lead to the blockage of the exhaust pipe, and in serious cases, it will also lead to black smoke from the exhaust.