Which is better, 27simn or 35crmnsi

35Crmnsi is a low-alloy ultra-high-strength alloy steel, because its tensile strength can reach more than 1700MPa, and the yield strength can reach more than 1500MPa, so it is a special steel for coal machinery, suitable for quarrying, coal mining, mining and other harsh environments.

27simn is mainly used in the quenched and tempered state, and is used to manufacture hot stamping parts that require high toughness and wear resistance; It can also be used in normalized or hot-rolled ** state, such as track pins of tractors.

The two materials are used in different environments and different uses, and only the right one is good.

35crmnsi steel is a low-alloy ultra-high-strength steel, which has good comprehensive mechanical properties after heat treatment, high strength, sufficient toughness, hardenability, weldability, and processing formability, but has low corrosion resistance and oxidation resistance, and is used after low-temperature tempering or isothermal quenching

All 35crmnsi good this is for sure!

There is no such thing as the best material, only the most suitable material for the working condition.

35crmnsi alloy steel

35crmnsi Introduction:

35crmnsi steel is a low-alloy ultra-high-strength steel, which has good comprehensive mechanical properties after heat treatment, high strength, sufficient toughness, hardenability, weldability, and processing formability, but has low corrosion resistance and oxidation resistance, and is used after low-temperature tempering or isothermal quenching

35crmnsi steel is a material with good hardenability, and after proper heat treatment, it can obtain comprehensive mechanical properties with good strength, hardness, toughness and fatigue strength, and can adapt to the complex working conditions of coal mining production.

35CrMnSi Chemical Composition:

Carbon C: Silicon Si:

Manganese Mn:Sulfur S: Allowable residual content

Phosphorus p: permissible residual content

Chromium Cr: Nickel Ni: Permissible Residual Content

Copper Cu: Permissible residual content

35crmnsi mechanical properties:

Tensile Strength b (MPa): 1620(165).

Yield strength s (mpa): 1275(130).

Elongation δ5 (%9

Section shrinkage 40

Impact power AKV (J): 31

Impact toughness value kv (j cm2): 39(4).

Specimen size: specimen.

35Crmnsi Heat Treatment Specification:

1) Quenching: 950 for the first time, 890 for the second time, oil cooled; tempering 230, air-cooled, oil-cooled; 2) 880 is quenched at 280 310 isothermal quenching.

35crmnsi Delivery Status:

Delivered in heat-treated (normalized, annealed or high-temperature tempered) or without heat-treated, the delivery status should be indicated in the contract.

35crmnsi Usage:

It is used to weld and rivet structural parts that work under vibration load, such as high-pressure blower blades, valve plates, and high-speed and high-load shafts, gears, sprockets, clutches, shaft sleeves, bolts, nuts, etc.

1.Chemical composition differences.

27simn chemical elements: c: si : mn:

35CrMnSi chemical elements: C: Si: Mn: Cr:

2.Differences in mechanical properties.

27simn mechanical properties: tensile strength 980MPa; Yield strength: 835MPa; Elongation after break: 12; Section shrinkage 40Impact power: 39j.

35Crmnsi mechanical properties: tensile strength 1620MPa; Yield strength: 1280MPa; Elongation after break: 9; Section shrinkage 40Impact power: 31j.

3.Characteristics and uses.

27simn is a material of alloy steel, and 35crmnsi belongs to low-alloy ultra-high-strength steel.

27simn has high strength and wear resistance, high hardenability, medium plasticity when cold deformation, good machinability, acceptable weldability, heat treatment is, steel toughness gini is less, water cooling can still maintain high toughness, but overheating sensitivity, white spot sensitivity and tempering brittleness tendency, most of them are used after modulation, and can also be used in the state of normalized or hot rolling supply. 27simn is a steel that can be used to manufacture high-toughness, high-wear-resistant hot-stamped parts that do not require heat treatment or normalizing, such as tractor track pins.

35crmnsi is used to manufacture medium-speed, heavy-load, high-strength parts and high-strength components, such as aircraft landing gear and other high-strength parts, high-pressure blower blades, and can partially replace the corresponding chromium-nickel alloy steel in the manufacture of small and medium-section parts.

Summary. 27simn is alloy steel, national standard: GB T3077-1999 The performance of this steel is better than that of 30Mn2 steel, with high hardenability, critical quenching diameter of 8 22mm in water, good machinability, cold deformation plasticity and weldability; In addition, the toughness of steel is not reduced much during heat treatment, but it has quite high strength and wear resistance, especially when water quenched, it still has high toughness; However, this steel is highly sensitive to white points, and has a tendency to temper brittleness and overheating during heat treatment.

The pros are as follows; The hardness of the material of 27simn is relatively large.

27simn is alloy steel, national standard: GB T3077-1999 The performance of this steel is better than that of 30Mn2 steel, the hardenability is high, the critical quenching diameter in water is up to 8 22mm, the machinability is good, and the cold deformation plasticity and weldability are medium; In addition, the toughness of steel is not reduced much during heat treatment, but it has quite high strength and wear resistance, especially when water quenching, it still has high toughness; However, this steel is highly sensitive to white points, and has a tendency to temper brittleness and overheating during heat treatment.

The hard blindness is large, and it can reach HRC52 or more. The main characteristics of 27SIMN alloy steel: the performance of 27SIMN is higher than 30Mn2, with high strength and wear resistance, high hardenability, medium cold deformation plasticity, good cutting performance, welding performance is acceptable, heat treatment, the toughness of steel is reduced less, and it can still maintain high toughness when water cooling.

27simn and 27mntib are different pro! Hello, I'm glad to answer your <> The difference between 27simn and 27mntib is that 27mntib is extremely difficult to smelt 27mn steel pipe, also known as centrifugal casting ductile iron pipe, is suitable for transporting water, gas and other fluids. The liquid trembling congratulatory ductile iron pipes all adopt flexible interfaces.

According to the interface type, it is divided into two categories: mechanical type and slide-in type. The mechanical interface type is divided into N1 type, X type and S type, and the slide-in interface type is T type. The performance of 27simn steel is superior to that of 30mn2 steel, with high hardenability, critical quenching in water and a straight hole diameter of 8 22mm, good machinability, medium cold deformation plasticity and weldability; In addition, the toughness of steel is not reduced much during heat treatment, but it has quite high strength and wear resistance, especially when water quenched, it still has high toughness; However, this steel is highly sensitive to white points, and has a tendency to temper brittleness and overheating during heat treatment.

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Do you have any other questions?

35SIMN belongs to the national standard alloy structural steel, and the implementation standard: GB T 3077-2015

35simn is a kind of alloy quenched and tempered steel with better performance and more economy. The hardenability of steel is good, the critical quenching diameter in water is up to 24, and the critical quenching diameter in oil is up to 11, and it has high strength and wear resistance after quenching and tempering, and has good toughness and labor resistance, its machinability is also good, and the cold deformation plasticity is medium; However, the weldability is poor, there is a tendency to temper brittleness during heat treatment, a slight decarburization, and there are white spots and overheating susceptibility. This type of steel is mainly used in the quenched and tempered state to make parts at medium speed and medium load; Or in the quenching and tempering state, it can be used as a part with high load and little impact, and can also be used as a part with a large cross-section and a need for surface quenching.

In the general machinery industry, this steel is used to manufacture transmission gears, spindles, mandrels, rotating shafts, connecting rods, worms, tram shafts, generator shafts, crankshafts, flywheels and large and small forgings; In the manufacture of steam turbines, it is used as a spindle and hub with a working temperature of less than 400 and a diameter of less than 250mm, an impeller with a thickness of less than 170mm and various important fasteners; In agricultural machinery, it is mostly used to manufacture wear-resistant parts such as hoe handles and plows. In addition, it can also be used as thin-walled seamless steel pipes. This steel can completely replace 40cr as quenched and tempered steel, and can also partially replace 40crni steel.

The chemical composition of 35simn is shown below

35simn is a kind of alloy quenched and tempered steel with better performance and more economy.

35simn is a material of alloy steel, and its naming is 35 represents the carbon content of this material, and the following Si and Mn represent the content of Si and Mn in this material.

1.Chemical composition.

35simn chemical elements: c: si : mn:

2.Mechanical properties.

35simn mechanical properties: tensile strength 885MPa; Yield strength: 735MPa; Elongation after break: 15; Section shrinkage: 45; Impact power: 47j.

3.Characteristics and uses.

35simn belongs to alloy quenched and tempered steel, good performance, can be used instead of 40cr, after quenching and tempering treatment, it has high static strength, fatigue strength and wear resistance and good toughness, good hardenability, and medium plasticity in cold deformation.

In the quenched and tempered state, it can be used to manufacture parts with medium speed and medium load, and in the quenching and tempering state, it can be used to manufacture parts with high load and small impact vibration and make parts with large cross-section and surface quenching, such as the main shaft and hub of the steam turbine, impeller and various important fasteners, transmission shafts, spindles, mandrels, connecting rods, gears, worms, tram axles in general machinery, etc., and thin-walled seamless steel pipes can also be made. Revise your answers.