What is the tempering of Cr12 die steel, what is the quenching temperature and tempering temperature

Forging process. CR12 die steel belongs to Lai-style body steel, and there is fishbone-like eutectic carbide in its as-cast structure, and the deformation resistance of CR12 die steel is large, and the forging tonnage should be adapted to the size of the blank. Poor thermal conductivity, heating temperature of 1050 1100, initial forging temperature of 100 1050, terminal temperature of 850 900, furnace cooling or sand cooling and timely annealing after forging.

Annealing process. The forged blank has a large internal stress, high hardness (477 653HB), difficult to cut, in order to eliminate the internal stress, improve the cutting performance, must be annealed. CR12 die steel generally adopts isothermal spheroidization annealing process, heating temperature 830 850, holding time 2 3h, isothermal 720 740, heat preservation 3 4h, annealing hardness 217 267hbs.

Quenching and tempering process.

In order to ensure the quenching quality of CR12 mold steel mold, great attention should be paid to prevent decarburization and oxidation problems on the surface of the mold during heating, the heating temperature of the quenching of the one-time hardening method is 960 980, the quenching cooling can be oil-cooled, air-cooled or staged cooling, the hardness is 60 64hrc, the tempering can be selected 160 400, the quenching heating temperature of the one-time hardening method is 1050 1100, the quenching cooling can be oil-cooled, air-cooled or staged cooling, and the hardness is 40 60hrc, The workpiece must be tempered several times (3 4 times) at 500 520 and the hardness of the steel rises to 60 63 HRC.

When the steel mold of CR12 mold needs to be "refurbished", in order to facilitate the cutting process, high temperature tempering treatment can be used to reduce the mold temperature. In addition, for the mold that needs to be re-quenched due to unqualified quenching quality, in order to reduce the heat treatment deformation caused by re-quenching, high-temperature tempering treatment can also be used in advance, but high-temperature tempering should prevent mold oxidation and decarburization during high-temperature tempering.

Jinhuazhou die steel.

Stress relief and reduction of hardness 180 200

Quenching temperature between 950 1000, oil quenching, equipment: pit furnace. The tempering temperature is between 550-650, and the tempering is not less than 2 times.

The high-temperature quenching temperature is 1100-1150, the low-temperature quenching temperature is 960-1050, the former has a secondary hardening phenomenon, and it can be air-cooled or oil-cooled after tempering, and it is best to preheat twice before high-temperature quenching.

CR12 steel is widely used in mass production as a general-purpose cold work tool, and its heat treatment methods are usually two: primary hardening method (low quenching + low return) and secondary hardening method (high quenching + high return).

The quenching temperature of the primary hardening method is 1020 1040 degrees, and the tempering temperature can be selected according to the requirements of the mold, and the cold stamping die that generally requires high hardness and wear resistance is tempered at a low temperature of 160 180 degrees, and the hardness after tempering can reach more than HRC60.

Scope of application. It is a widely used cold work die steel, which has high strength, good hardenability and good wear resistance, but poor impact toughness. It is mainly used for cold stamping dies and punches, cold cutting scissors, drill bushings, gauges, wire drawing dies, embossing dies, thread rolling plates, drawing dies and thread rolling dies that bear small impact loads and require high wear resistance.

CR12 die steel is a high-carbon and high-chromium ledeonitic steel, and it is also a widely used cold work die steel. The steel has good hardenability, wear resistance and hot workability. Carbides are well distributed in steel and can be used to manufacture various cold work molds with complex shapes and heavy working conditions.

CR12 quenching: 950 1000 oil quenching, secondary tempering 550 high temperature quenching: 1100 1150, low temperature quenching 960 1050, tempering 550 650, the former has secondary hardening, tempering not less than 2 times, 2 hours each time; After tempering, it can be air-cooled or oil-cooled, and it is best to preheat twice before high-temperature quenching, and when heating at high temperature, protective measures need to be taken to prevent oxidation.

Tempering: stress relief and stabilization of the structure, heating temperature 180 200; tempering for 2 hours; Hardness (HRC) 60 62.

Stress relief and hardness reduction, heating temperature 320 350 , tempering 2 hours, hardness (HRC) 57 58.

Hardness is based on heat treatment requirements, not a fixed value, but a limit range. After the quenching temperature of CR12MOV is 1010°C, it is air-cooled, tempered at 200°C, and the hardness can be 58 to 60HRC. But the premise is that there is reliable material quality and quality, as well as mature heat treatment technology.

CR12MOV steel is a carbon-molybdenum polyethylene steel, its carbon content is much lower than that of CRL2 steel, and molybdenum and vanadium elements are added, so that the hot working performance, impact toughness and carbide distribution of the steel have been significantly improved.

The steel has good wear resistance, hardenability, hardenability, toughness, thermal stability, compressive strength, as well as micro-deformation, excellent heald performance and wide adaptability. The heating softening temperature is 520 °C. The cross-sectional size can be completely quenched below 4mm, and the wear resistance of the steel is 3 or 4 times that of low-alloy die steel, and the quenching volume deformation is small.

Quenching depth: oil quenching 200 300mm.

CR12 mold steel heat treatment specification: 1) quenching, 950 1000 oil cooling; 2) Quenching 980, oil cooling, 180 tempering for 2h. Metallographic organization:

Tempered martensite + undissolved carbides + residual austenite. Delivery Condition: The steel is delivered in annealed condition.

Summary. 1. First of all, I don't know what kind of mold you do, according to the common sense of the mold, choose a material that uses CR12MOV is a stamping die, and the general hardness requirements will not be so low, at least above 60 degrees to be easy to use. And you only need to deal with it between 50-52 degrees.

If the hardness treatment is so low, it is not necessary to use this material, and H13 can be used instead.

2. There are two possibilities for uneven hardness after quenching: the composition of the mold material is not enough, there is no national standard, or your first-class supplier is replaced by other materials. b：

The tempering time of heat treatment is not sufficient or the quenching temperature is insufficient. According to years of experience in die steel sales, it is certain that there is a problem with your material.

3. If the hardness tempering is low, there is only one way to anneal and re-process, but there is a risk that cracking or uneven hardness can occur again. Look at the size of your workpiece, if it's smaller, it might be better to get a new one.

Can No. 30 steel replace CR12MOV steel to make molds, quenched and tempered at low temperatures.

1. First of all, I don't know what kind of mold you do, according to the common sense of the mold, choose a material that uses CR12MOV is a stamping die, and the general hardness requirements will not be so low, at least above 60 degrees to be easy to use. And you only need to deal with it between 50-52 degrees. If the hardness treatment is so low, it is not necessary to use this material, and H13 can be used instead.

2. There are two possibilities for uneven hardness after quenching: the material composition of the mold is not enough, there is no standard roller bridge according to the national regulations, or it is replaced by other materials of your company. b：

The tempering time of heat treatment is not sufficient or the quenching temperature is insufficient. According to many years of experience in the sales of die steel, it is certain that there is a problem with the material of your stove. 3. If the hardness tempering is low, there is only one way to re-process it after annealing, but there is a kind of wind brother risk that cracking or uneven hardness will occur again.

Why not, I want a reason.

This one is a problem.

The answer is no, but I don't understand why.

Dear, I'm helping you with your inquiry.

Please describe it clearly.

Second question.

Good. Dear, this question can't be queried.

<> I can't send a message, so what's going on?

Dear, you need to find a professional for consultation.

CR12MOV steel is a high-carbon, high-chromium leasonitic steel with a lower carbon content than CR12 steel. The steel has high hardenability, the cross-section below 300mm can be fully hardened, and the volume change during quenching is also smaller than that of CR12 steel. The heat treatment process of CR12 mold hand cluster steel The heat treatment system is 960 degrees air cooling + 700 720 degrees tempering and air cooling for steel rods and forgings.

The final heat treatment process, due to the abundance, can provide you with a set of typical processes: Quenching: First preheating:

300 500, 2nd preheating 840 860; Quenching temperature: 1020 1040; Cooling medium: oil, medium temperature:

20 60, Bi Ying cooled to oil temperature; Subsequently, air-cooled, HRC60 63. Tempering: After the above quenching process, the destruction can achieve the effect of reducing the hardness, and the specific tempering process is as follows

Heating temperature 400 425 to get HRC57 59.

Summary. Hardness of CR12MOV steel.

Introduction: Cr12MOV steel chemical composition: carbon C:, chromium cr:, vanadium V:, molybdenum Mo:

It is one of the widely used cold work die steels in China. The steel has the advantages of good hardenability, high hardness and wear resistance, and small distortion in heat treatment, and is often used to manufacture large cold work molds that bear heavy loads and complex shapes. However, the significant disadvantage of this steel is that it is brittle, and the mold often fails early.

Therefore, how to improve its strength under the condition of maintaining a certain strength and toughness is a problem that the steel users often encounter and need to solve. Generally speaking, the influence of mold failure heat treatment factors accounts for about 50%. This paper focuses on the effects of different heat treatment on the hardness of CR12MOV steel.

1. CR12MOV use.

The hardenability, hardness, strength and toughness of CR12MOV die steel after quenching and tempering are higher than those of CR12, and the workpiece with a diameter of 300 400mm or less can be completely hardened, and the quenching deformation is small, but the high-temperature plasticity is poor. CR12MOV is mostly used to manufacture composite molds with large cross-sections, complex shapes and heavy workloads.

CR12MOV steel heat treatment, tempering and hardness data**!

Hello, happy to serve you.

Hardness of Cr12MoV Steel Introduction: Cr12Mov Steel Chemical Composition: Carbon C:, Chromium Cr: Stool, Vanadium V:, Molybdenum Mo:

It is one of the widely used cold work die steels in China. The steel has the advantages of good hardenability, high hardness and wear resistance, and small distortion in heat treatment, and is often used to manufacture large cold work molds that bear heavy load deficits and complex shapes. However, the significant disadvantage of this steel is that it is brittle, and the mold often fails early.

Therefore, how to improve its strength under the condition of maintaining a certain strength and toughness is a problem that the steel users often encounter and need to solve. Generally speaking, the influence of mold failure heat treatment factors accounts for about 50%. This paper focuses on the effects of different heat treatment on the hardness of CR12MOV steel.

1. CR12MOV use CR12MOV mold is higher than CR12 after hardenability, hardness, strength and toughness after quenching and tempering, and the workpiece with a diameter of 300 400mm or less can be completely quenched, and the quenching deformation is small, but the high temperature plasticity is poor. CR12MOV is mostly used to manufacture composite molds with large cross-sections, complex shapes and heavy workloads.

Dear users, the heat treatment hardness of CR12 die steel is generally about 58-62HRC. CR12 die steel is a kind of high-carbon and high-chromium cold work die steel, which has high hardness, wear resistance and corrosion resistance. In the heat treatment process of Oak Minzhi, the CR12 die steel needs to be annealed first, then quenched and tempered.

The specific heat treatment process parameters need to be determined according to the specific working conditions and requirements. In practical applications, the hardness of CR12 die steel will also be affected by other factors, such as processing technology, cooling rate, etc. Therefore, when using CR12 die steel, it needs to be selected and adjusted according to the specific situation.

In addition to heat-treated hard beam dissipation, CR12 die steel also has other excellent properties, such as high strength, high toughness, good wear resistance and corrosion resistance. Therefore, it has been widely used in mold dust manufacturing, metal processing and other fields. In short, the heat treatment hardness of CR12 die steel is generally about 58-62HRC, and the specific heat treatment process needs to be determined according to the specific situation.

In practical applications, it is also necessary to consider the influence of other factors to select the right materials and processing processes to meet the job requirements. <>

The hardenability, hardness, wear resistance and strength of CR12MOV die steel are higher than those of CR12. It is used to manufacture various cold stamping dies and tools with large cross-sections, complex shapes and heavy working conditions, such as punching dies, trimming dies, rolling dies, steel plate CR12MOV thick plate deep drawing die hall family, circular saws, standard tools and gauges, thread rolling dies, etc. annealed, 255 207HB, indentation diameter; Quenching, 58hrc 1) Low quenching and low back:

The quenching temperature is 950 1040, the tempering temperature is about 200, and the secondary tempering is 2) high quenching and high return: The quenching temperature is 1050 1100, and the tempering temperature is about 520. In order to improve the life of the mold to more than 800,000 molds, the hardening method of quenching and low temperature tempering can be implemented on the pre-hardened steel.

When quenching and clearing, first preheat at 500-600 for 2-4 hours, then keep warm at 850-880 for a certain time (at least 2 hours), put it in oil and cool it to 50-100 Tempered by oil, the hardness can reach 50-52hrc after quenching, in order to prevent cracking, 200 low temperature tempering treatment should be carried out immediately, after tempering, the hardness can be kept above 48hrc tempering.