9SiCr explains the grade and use.

9SICR belongs to the national standard low-alloy cutting tool steel, the implementation standard: GB T 3077-2014

9siCR steel is a low-alloy cutting tool steel, but it is also often used to make cold work mold parts, and the effect is very good. It has higher hardenability and hardenability than chromium steel (CR2 or 9CR2) and has higher tempering stability. It is suitable for grading quenching or isothermal quenching.

The steel was first introduced from 9XC in the former Soviet Union and used to be called 9CRSI steel. The composition and performance are exactly the same as the 9xc. It has a long history of application in China.

The only foreign similar steel grades are 90CrSi5 from Germany and 2092 and SR1855 from Sweden, DF-1. No other country has seen a similar grade. The steel can be made into a variety of cold work mold parts with complex shapes and small deformation requirements.

The chemical composition of 9sicr is shown below:

<> 9SICR steel for gage and cutting tools.

Alloy tool steel: 9sicr

Standard: GB T 1299-2000

9sicr alloy tool steel characteristics and scope of application:

9SICR steel for gage and cutting tools is a commonly used low-alloy tool steel with high hardenability and hardenability, as well as high tempering stability. 9sicr alloy tool steel can be used to manufacture tools with complex shapes, small deformation, high wear resistance, and low-speed cutting, such as drills, threading tools, reamers, dies, taps, thread rolling plates, and thread rolling wheels.

9sicr alloy tool steel chemical composition:

Carbon C: Silicon Si:

Manganese mn:sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni: Permissible Residual Content

Copper Cu: Permissible residual content

9sicr alloy tool steel mechanical properties:

Hardness: annealed, 241 197HB, indentation diameter; 187 229HB (for the manufacture of threading tools); Quenched, 62hrc

9siCR alloy tool steel heat treatment specification and metallographic structure:

Heat treatment specification: specimen quenching 820 860, oil cooling.

9SICR Alloy Tool Steel Delivery Status: The steel is delivered in annealed condition.

9sicr is a low-alloy cutting tool steel in alloy tool steels. The average carbon content, silicon and chromium content does not exceed.

It is suitable for making low-speed cutting tools. Such as: taps.

Plate teeth, etc.

Kiss! Hello, happy to answer your <>

The meaning of the pro-9sicr grade is as follows: 9sicr belongs to the low-alloy cutting tool steel in the alloy tool steel. The average carbon content, silicon and chromium content are not more than suitable for making low-speed cutting tools.

Such as: taps, plates, etc. 9sicr is a low-alloy cutting tool steel in alloy tool steels.

The average carbon content, silicon and chromium content are not more than steel, and it is a low-alloy cutting tool steel, and cold work die steel is often made. Its chemical composition and mechanical properties are required to see: GB T1299-2000 carbon C:.

95 Si Si:. 60 manganese mn:. 60 sulfur s:

Phospho: Chromium Cr:. 25 nickel ni:

Allowable residual content Copper Cu: Allowable residual content In the grade "9SICR" of steel, "9" means that its carbon content is around the same, "Si" means that its silicon content is higher than that of ordinary carbon structural steel, and "CR" means that its chromium content is higher than that of ordinary carbon structural steel, but lower than that of alloy structure, which is suitable for making low-speed cutting tools. Such as:

Taps, dies, etc. Hope mine can help you <>

Do you have any other questions?

crsi

abbr.Concrete Reinforcing Steel Institute

9sicr steel is a low-alloy cutting tool steel, and it is also often used to make cold work die steel.

Its chemical composition and mechanical properties are required to see: GB T1299-2000 carbon C:.

Silicon si:manganese mn:

Sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni: Permissible Residual Content

Copper Cu: Permissible residual content

Steel grade "9sicr".

9" means that its carbon content is around the limit.

SI" indicates that its silicon content is higher than that of ordinary carbon structural steel.

CR" indicates that its chromium content is higher than that of ordinary carbon structural steel, but lower than that of alloy structural steel.

This is a grade of high-carbon, low-alloy tool steel.

The chemical composition is:

Carbon C: Silicon Si:

Chromium cr:

9sicr steel is a low-alloy cutting tool steel, and is often made of cold work die steel, which is a commonly used low-alloy tool steel, with high hardenability and hardenability, as well as high tempering stability. It can be used to manufacture tools with complex shapes, small deformation, high wear resistance and low-speed cutting, such as drills, threading tools, reamers, dies, taps, thread rolling plates and thread rolling wheels. Its chemical composition and mechanical properties are required to see:

gb/t 1299—2000

Carbon C: Silicon Si:

Manganese mn:sulfur s:

Phosphorus p:

Chromium Cr: Nickel Ni: Permissible Residual Content

Copper Cu: Permissible residual content

Characteristics, chemical composition, heat treatment process and application of 9SICR steel.

Characteristics of 9sicr steel.

9SICR steel can be regarded as being developed on the basis of T9A steel, mainly adding Si and CR elements.

The main purpose of adding CR and Si elements to the steel is to improve the hardenability of the steel. The dissolution of CR and Si elements into the matrix can strengthen the matrix structure and improve the tempering stability of the steel.

In addition, CR elements are dissolved into Fe3C to form a composite (Fe, Mn)3C, which can improve its hardness and increase the hardness and wear resistance of steel.

Due to the addition of CR element and low BS point, there is a supercooled austenite stability zone between bainite and pearlite transition temperature, forming two C curves, and the addition of Si element delays bainite transformation, so this steel grade is suitable for graded quenching or isothermal quenching.

Due to the addition of CR and Si elements, the critical point A3 is increased, and the residual austenite is less after quenching.

The presence of more Si elements in steel is conducive to improving the microstructure of carbides and avoiding the formation of steely carbides, but it also increases the decarburization tendency of steel, so this kind of steel needs to be protected when heating.

Compared with CRWMN steel, its hardenability, hardenability, tempering stability, strength and hardness, and wear resistance are not as good as CRWMN steel.

Main Chemical Composition of 9siCR Steel:

Heat treatment process for 9sicr steel.

The phase transition points are: AC1770, ACCM870, AR1730, MS160. The initial forging temperature of 9SICR steel is 1050 1100, the final forging temperature is 800 850, and it is cooled in the sand or in the pit after forging.

A common heat treatment process for 9siCR steel.

Heat treatment process Process parameters Hardness requirements Process characteristics.

Incomplete annealing heating 790 810, cooling to below 500 with the furnace after heat preservation 197 241HBS AC1770, ACCM870, heating temperature should be between AC1 ACcm.

Isothermal spheroidization annealing heating 790 810, heat preservation, 700 720 After isothermalization, it is cooled with the furnace to below 500 and air-cooled 197 241hbs The heating temperature should be between AC1 accm, and the isothermal temperature should be lower than the AR1730 line 10 30 to obtain granular pearlite structure.