How about 20CrMnTi hardness

20crmnti is carburized steel, which can be carburized to improve the surface hardness of the material, and the hardness of the delivery state is hbs|≥:217

20CrmnTi belongs to the national standard carburizing steel, and the implementation standard: GB T 3077-2015

20crmnti is carburized steel, and carburized steel is usually low carbon steel with a carbon content. It is mostly used in automobiles to manufacture transmission gears, which is cr mn ti steel in medium hardenability carburizing steel, which has high hardenability, especially high low temperature impact toughness in the case of ensuring hardening. 20crmnti surface carburized hardened steel.

Good processability, small processing deformation, and good fatigue resistance. The main uses are: used in shafts, piston parts and various special parts of automobiles and aircraft.

The chemical composition of 20crmnti is shown below

Landlord, it's not low carbon steel, its hardness will not be high! This material itself will have segregation! If it is high after the forging billet is normalized, then the cooling speed is fast.

It mainly depends on what heat treatment you have done, generally 20crmnti is carburized steel, and carburizing treatment should be done. If direct quenching 880, the hardness is between 42-46HRC.

My personal experience Generally, its hot-rolled state is 241HB, and the annealing state should also be 180, it is a low-alloy high-strength steel, and there is a work hardening phenomenon, so the specific problems should be analyzed specifically, and the phenomenon of high hardness is related to the process and delivery state, and should be analyzed.

The landlord said that the hardness of the blank is not high, if it is, it should be caused by the poor preparation of heat treatment.

The main differences between 20crmnti and 20crmntih are:

1. There is no mandatory standard for 20crmnti materials for inclusions, grain size and other indicators at the time of delivery, while 20crmntih materials must meet the standard requirements at the time of delivery, that is, the internal quality requirements are stricter.

2. In order to improve the hardenability of steel, steel mills generally increase the content of CR and Mn, that is, the cost increases.

In addition, in order to facilitate the selection of materials for different users, hardenable steel has been classified according to hardenability bands

GB T5216-2004 "Technical Conditions for Guaranteed Hardenability Alloy Structural Steel") divides 20CrMnTi into three categories: 20CrMntiH, 20CrMntiH and 20CrMntihl.

cgma001-2004《

Technical Conditions for Steel for Vehicle Gears" divides 20crmnti into more fine: that is, 20crmntih crmntih crmntih crmntih crmntih crmntih crmntih crmntih crmntih 6

The h in 20crmntih stands for hardenability, and the material requirements are higher than those of 20crmnti.

20crmntih guarantees hardenability structural steel, the same material The difference lies in the hardenability

20crmntih standard:gb/t 5216-2014

20crmntih numerical code:a26205

20crmntih chemical composition:Carbon C:

Silicon si:manganese mn:

Sulfur S: Permissible residual content

Phosphorus p: permissible residual content

Chromium Cr: Titanium Ti:

20crmntih mechanical properties:Tensile Strength b (MPa): 1080(110)Yield Strength S (MPa):

835(85) elongation δ5 (%10

Section shrinkage (45

Impact power AKV (J): 55

Impact toughness value kv (j cm2): 69(7)hardness: 217hb

20crmntih heat treatment specification:Quenching: 880 for the first time, 870 for the second time, oil cooled; Temper 200, water-cooled, air-cooled20crmntih other properties:

Density: 103kg m3

Modulus of elasticity: 207gpa

Poisson's ratio: thermal conductivity: 10-51

20crmntih hardness:Hardness: annealed or tempered at high temperature, 217HB, indentation diameter20crmntih use:

It is a substitute steel for 18crmnti, widely used as carburizing parts, and is used in the automobile and tractor industry for important carburizing parts with a cross-section below 30mm, bearing high speed, medium or heavy load, as well as impact and friction, such as gears, shafts, ring gears, gear shafts, spindles of sliding bearings, crossheads, claw clutches, worms, etc.

20crmntih main specifications:20crmntih round bar, 20crmntih rolled bar, 20crmntih cold drawn bar, 20crmntih forging bar, 20crmntih plate, 20crmntih flat bar, 20crmntih forging, 20crmntih forging ring, 20crmntih machining parts, 20crmntih pipe, 20crmntih forging cake.

What kind of grinding wheel is used for 20crmntih material cylindrical grinder? Requirements RA: High efficiency, including particle size, 20crmnti is carburizing rigid, commonly used in the manufacture of gears. It requires a surface roughness of 100 for grinding

20crmntih is carburized gear steel.

Gear steel 20crmntih:

Chemical Composition: Carbon C:

Silicon si:manganese mn:

Sulfur S: Permissible residual content

Phosphorus p: permissible residual content

Chromium Cr: Nickel Ni: Permissible Residual Content

Copper Cu: Permissible residual content

Titanium Ti: Mechanical Properties:

Hardness: annealed or tempered at high temperature, 217HB, indentation diameter Heat treatment specification and metallographic structure:

Delivery Condition: Delivered in rolled or forged condition. According to the requirements of the buyer, it can also be delivered in the condition of heat treatment (normalizing, annealing or high temperature tempering). The delivery status should be indicated in the contract.

<>20crmnti is a gear steel material20crmnti gear steel is carburized steel, and carburized steel is usually a low carbon steel with a carbon content. It is mostly used in automobiles to manufacture transmission gears, which is crmnti steel in medium hardenability carburized steel, which has high hardenability, and has high strength and toughness in the case of ensuring hardening, especially with high low-temperature impact toughness.

20crmnti is a low-carbon alloy steel that is commonly used as carburizing steel.

Carburized steel is usually a low-carbon steel with a carbon content. It is mostly used in automobiles to make transmission gears. It is a medium hardenable carburized steel in CR

MNTI steel, which has high hardenability, has high strength and toughness under the condition of ensuring hardening, especially has high low-temperature impact toughness.