CN113718170A - Cold-work die steel material and manufacturing process thereof - Google Patents
Cold-work die steel material and manufacturing process thereof Download PDFInfo
- Publication number
- CN113718170A CN113718170A CN202110702497.1A CN202110702497A CN113718170A CN 113718170 A CN113718170 A CN 113718170A CN 202110702497 A CN202110702497 A CN 202110702497A CN 113718170 A CN113718170 A CN 113718170A
- Authority
- CN
- China
- Prior art keywords
- percent
- cold
- work die
- die steel
- steel material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
- C21D1/32—Soft annealing, e.g. spheroidising
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/004—Heat treatment of ferrous alloys containing Cr and Ni
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/005—Heat treatment of ferrous alloys containing Mn
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D6/00—Heat treatment of ferrous alloys
- C21D6/007—Heat treatment of ferrous alloys containing Co
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
Abstract
The invention discloses a cold-work die steel material and a manufacturing process thereof, and particularly relates to the field of high alloy steel preparation, wherein the cold-work die steel material comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe. After the quenching process, the cold-work die steel material prepared by the invention has good toughness and better comprehensive performance compared with the traditional die steel, generates a secondary hardening phenomenon during the tempering of the cold-work die steel, disperses and separates out fine particles, improves the wear resistance of the steel, and prevents the growth of crystal grains by the separated particles of the prepared cold-work die steel through the steps of hardening quenching and toughness tempering, so that the steel has better toughness, and all cold-work die steel has balanced performance and can reach equivalent use conditions, thereby meeting the performance requirements of users on the cold-work die steel.
Description
Technical Field
The invention relates to the technical field of high alloy steel preparation, in particular to a cold-work die steel material and a preparation process thereof.
Background
When the cold-work die steel works, the working part of the die bears large pressure, bending force, impact force and friction force because the deformation resistance of the processed material is large. Therefore, the normal scrap of cold-work dies is generally due to wear and premature failure due to fracture, chipping force and deformation.
Cold work die steel has many points in common compared to blade steel. The die is required to have high hardness and wear resistance, high bending strength and enough toughness to ensure the smooth operation of the stamping process, and the difference lies in the complicated shape and processing technology of the die. And the grinding is difficult because of large friction area and high abrasion possibility. Therefore, the abrasion-resistant die is required to have higher resistance to high stamping force during working. The complex shape is easy to generate stress concentration, so that the alloy is required to have higher toughness; the mould has large size and complex shape. Higher hardenability, less deformation and crack tendency are required. In short, the cold-work die steel has higher requirements on hardenability, wear resistance, toughness and the like than cutting tool steel. However, since the requirement for red hardness is low or substantially zero (because of cold forming), steel grades suitable for cold working dies have been formed accordingly, and for example, high wear resistance, micro-deformation cold working die steel, high toughness cold working die steel, and the like have been developed.
The cold-work die steel in the prior art is various and is divided into various types of folding Cr12, Cr12Mo1V1, Cr12MoV, Cr5Mo1V, 9Mn2V and CrWMn according to different performances, but because of the difference of raw materials in the preparation steps and the difference of preparation methods, the cold-work die steel with any one of high hardness, high hot hardness and high toughness can be obtained according to the special purpose, but with the continuous development of social technology, the performance requirements on the materials are continuously improved, and how to further improve the preparation process of the cold-work die steel, so that the cold-work die steel with high performance is prepared to meet the use requirements.
Disclosure of Invention
In order to overcome the above defects in the prior art, the embodiment of the invention provides a cold-work die steel material and a manufacturing process thereof, and the technical problems to be solved by the invention are as follows: how to further improve the performance of the cold-work die steel.
In order to achieve the purpose, the invention provides the following technical scheme: a cold-work die steel material comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe.
In a preferred embodiment, the mass percentages of the components are as follows: 0.7% of C, 6.5% of Cr, 1.8% of Ni, 0.7% of Si, 0.1% of Mn, 2.0% of Mo, 1.7% of V, 0.9% of W and the balance of Fe.
In a preferred embodiment, the mass percentages of the components are as follows: 0.75% of C, 6.7% of Cr, 2.0% of Ni, 0.9% of Si, 0.3% of Mn, 2.25% of Mo, 1.95% of V, 1.1% of W and the balance of Fe.
In a preferred embodiment, the mass percentages of the components are as follows: 0.8% of C, 7.0% of Cr, 2.2% of Ni, 1.2% of Si, 0.5% of Mn, 2.5% of Mo, 2.2% of V, 1.3% of W and the balance of Fe.
The invention also comprises a manufacturing process of the cold-work die steel material, which comprises the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at the temperature of 1600-1700 ℃, and preserving heat for a period of time to make the temperature and the components of the molten liquid uniform;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 800-850 ℃, preserving heat for 1.5-1.8h at the temperature, cooling the heated steel ingot to 680-720 ℃, preserving heat for 5-5.5h, cooling to 600 ℃ at constant speed, discharging and naturally cooling to room temperature;
s4, hardening and quenching: heating the steel ingot blank annealed in the step S3 to 1080-; quenching at high temperature, and tempering at high temperature for multiple times to convert the retained austenite into martensite so as to achieve secondary hardening, thereby obtaining high hardness and high hot hardness, but reducing toughness and increasing size;
s5, toughness back quenching: and (4) heating the steel ingot quenched in the step S4 to 450-temperature and 500 ℃ again for heat preservation treatment, then performing back quenching treatment on the steel ingot by using liquid nitrogen, repeating the back quenching for 4-5 times to obtain a die steel ingot, and performing rapid cooling treatment on the hardened and quenched steel ingot by using the low temperature of the liquid nitrogen to retract the volume of the steel ingot with expanded size, so that the toughness of the steel ingot is further improved on the premise of ensuring high hardness and high hot hardness.
In a preferred embodiment, the smelting time in the step S1 is set to be 1.5-2h, and the temperature in the holding period and the temperature in the smelting period are kept the same.
In a preferred embodiment, the constant cooling rate in the annealing in the step S3 is set to be 30-50 ℃/h, and the holding time of the two rounds in the spheroidizing annealing step is preferably 1.6h and 5.3h respectively.
In a preferred embodiment, the tough-quenching in step S5 is performed outside the furnace, and ventilation is performed with a ventilation fan of 500W or more.
The invention has the technical effects and advantages that:
according to the cold-work die steel material prepared by improving the raw material proportion and the preparation process, after the quenching process, more martensite and a proper amount of carbide enable the cold-work die steel material to have higher strength and wear resistance, the content of the excess carbide is reduced, the cold-work die steel material has good toughness and better comprehensive performance compared with the traditional die steel, a secondary hardening phenomenon is generated during the tempering of the cold-work die steel, fine particles are dispersed and separated out, the wear resistance of the steel is improved, the separated particles of the prepared cold-work die steel can prevent the growth of crystal grains through the steps of hardening quenching and toughness tempering, the steel has better toughness, the performances of various cold-work die steels are balanced, and the equivalent use conditions can be achieved, so that the performance requirements of users on the cold-work die steel are met.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the invention provides a cold-work die steel material which comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe;
specifically, in the embodiment, the mass percentages of the components are as follows: 0.7% of C, 6.5% of Cr, 1.8% of Ni, 0.7% of Si, 0.1% of Mn, 2.0% of Mo, 1.7% of V, 0.9% of W and the balance of Fe.
The invention also comprises a manufacturing process of the cold-work die steel material, which comprises the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at 1650 ℃, and preserving heat for 1.8 hours to ensure that the temperature and the components of the molten liquid are uniform;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 830 ℃, preserving heat for 1.6h at the temperature, cooling the heated steel ingot to 700 ℃, preserving heat for 5.3h, cooling to 600 ℃ at a constant speed, discharging and naturally cooling to room temperature;
s4, hardening and quenching: heating the ingot blank annealed in the step S3 to 1080-; quenching at high temperature, and tempering at high temperature for multiple times to convert the retained austenite into martensite so as to achieve secondary hardening, thereby obtaining high hardness and high hot hardness, but reducing toughness and increasing size;
s5, toughness back quenching: and (4) heating the steel ingot quenched in the step S4 to 450-temperature and 500 ℃ again for heat preservation treatment, then performing back quenching treatment on the steel ingot by using liquid nitrogen, repeating the back quenching for 4-5 times to obtain a die steel ingot, and performing rapid cooling treatment on the hardened and quenched steel ingot by using the low temperature of the liquid nitrogen to retract the volume of the steel ingot with expanded size, so that the toughness of the steel ingot is further improved on the premise of ensuring high hardness and high hot hardness.
Example 2:
the invention provides a cold-work die steel material which comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe;
specifically, in the embodiment, the mass percentages of the components are as follows: 0.75% of C, 6.7% of Cr, 2.0% of Ni, 0.9% of Si, 0.3% of Mn, 2.25% of Mo, 1.95% of V, 1.1% of W and the balance of Fe.
The invention also comprises a manufacturing process of the cold-work die steel material, which comprises the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at 1650 ℃, and preserving heat for 1.8 hours to ensure that the temperature and the components of the molten liquid are uniform;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 830 ℃, preserving heat for 1.6h at the temperature, cooling the heated steel ingot to 700 ℃, preserving heat for 5.3h, cooling to 600 ℃ at a constant speed, discharging and naturally cooling to room temperature;
s4, hardening and quenching: heating the ingot blank annealed in the step S3 to 1080-; quenching at high temperature, and tempering at high temperature for multiple times to convert the retained austenite into martensite so as to achieve secondary hardening, thereby obtaining high hardness and high hot hardness, but reducing toughness and increasing size;
s5, toughness back quenching: and (4) heating the steel ingot quenched in the step S4 to 450-temperature and 500 ℃ again for heat preservation treatment, then performing back quenching treatment on the steel ingot by using liquid nitrogen, repeating the back quenching for 4-5 times to obtain a die steel ingot, and performing rapid cooling treatment on the hardened and quenched steel ingot by using the low temperature of the liquid nitrogen to retract the volume of the steel ingot with expanded size, so that the toughness of the steel ingot is further improved on the premise of ensuring high hardness and high hot hardness.
Example 3:
the invention provides a cold-work die steel material which comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe;
specifically, in the embodiment, the mass percentages of the components are as follows: 0.75% of C, 6.7% of Cr, 2.0% of Ni, 0.9% of Si, 0.3% of Mn, 2.25% of Mo, 1.95% of V, 1.1% of W and the balance of Fe.
The invention also comprises a manufacturing process of the cold-work die steel material, which comprises the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at 1650 ℃, and preserving heat for 1.8 hours to ensure that the temperature and the components of the molten liquid are uniform;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 830 ℃, preserving heat for 1.6h at the temperature, cooling the heated steel ingot to 700 ℃, preserving heat for 5.3h, cooling to 600 ℃ at a constant speed, discharging and naturally cooling to room temperature;
s4, hardening and quenching: heating the ingot blank annealed in the step S3 to 1080-; quenching at high temperature, and tempering at high temperature for several times to convert the retained austenite into martensite for secondary hardening, thereby obtaining high hardness and high hot hardness.
Example 4:
the invention provides a cold-work die steel material which comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe;
specifically, in the embodiment, the mass percentages of the components are as follows: 0.75% of C, 6.7% of Cr, 2.0% of Ni, 0.9% of Si, 0.3% of Mn, 2.25% of Mo, 1.95% of V, 1.1% of W and the balance of Fe.
The invention also comprises a manufacturing process of the cold-work die steel material, which comprises the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at 1650 ℃, and preserving heat for 1.8 hours to ensure that the temperature and the components of the molten liquid are uniform;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 830 ℃, preserving heat for 1.6h at the temperature, cooling the heated steel ingot to 700 ℃, preserving heat for 5.3h, cooling to 600 ℃ at a constant speed, discharging and naturally cooling to room temperature;
s4, toughness back quenching: and (4) heating the steel ingot quenched in the step S4 to 450-temperature and 500 ℃ again for heat preservation treatment, then performing back quenching treatment on the steel ingot by using liquid nitrogen, repeating the back quenching for 4-5 times to obtain a die steel ingot, and performing rapid cooling treatment on the hardened and quenched steel ingot by using the low temperature of the liquid nitrogen to retract the volume of the steel ingot with expanded size, so that the toughness of the steel ingot is further improved on the premise of ensuring high hardness and high hot hardness.
Example 5:
the invention provides a cold-work die steel material which comprises the following components in percentage by mass: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe;
specifically, in the embodiment, the mass percentages of the components are as follows: 0.8% of C, 7.0% of Cr, 2.2% of Ni, 1.2% of Si, 0.5% of Mn, 2.5% of Mo, 2.2% of V, 1.3% of W and the balance of Fe.
The invention also comprises a manufacturing process of the cold-work die steel material, which comprises the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at 1650 ℃, and preserving heat for 1.8 hours to ensure that the temperature and the components of the molten liquid are uniform;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 830 ℃, preserving heat for 1.6h at the temperature, cooling the heated steel ingot to 700 ℃, preserving heat for 5.3h, cooling to 600 ℃ at a constant speed, discharging and naturally cooling to room temperature;
s4, hardening and quenching: heating the ingot blank annealed in the step S3 to 1080-; quenching at high temperature, and tempering at high temperature for multiple times to convert the retained austenite into martensite so as to achieve secondary hardening, thereby obtaining high hardness and high hot hardness, but reducing toughness and increasing size;
s5, toughness back quenching: and (4) heating the steel ingot quenched in the step S4 to 450-temperature and 500 ℃ again for heat preservation treatment, then performing back quenching treatment on the steel ingot by using liquid nitrogen, repeating the back quenching for 4-5 times to obtain a die steel ingot, and performing rapid cooling treatment on the hardened and quenched steel ingot by using the low temperature of the liquid nitrogen to retract the volume of the steel ingot with expanded size, so that the toughness of the steel ingot is further improved on the premise of ensuring high hardness and high hot hardness.
Example 6:
the cold work die steel materials prepared in the above examples 1 to 5 were subjected to a pin cutting processing experiment and performance measurement, and the prepared cold work die steel materials were subjected to performance measurement in five groups, to obtain the following data:
the above table shows that the raw materials in example 2 have a moderate mixing ratio, the cold-work die steel material prepared by the raw material mixture ratio and the preparation process has a bending strength of above 5400M Pa, a compressive strength of above 2900M Pa, an impact toughness of above 110M Pa, a hardness of 63HRC, and balanced cold-work die steel properties, and can meet the performance requirements of users on the cold-work die steel.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (8)
1. The cold-work die steel material is characterized in that: wherein the mass percent of each component is as follows: 0.7 to 0.8 percent of C, 6.5 to 7.0 percent of Cr, 1.8 to 2.2 percent of Ni, 0.7 to 1.2 percent of Si, 0.1 to 0.5 percent of Mn, 2.0 to 2.5 percent of Mo, 1.7 to 2.2 percent of V, 0.9 to 1.3 percent of W and the balance of Fe.
2. A cold work die steel material according to claim 1, characterized in that: wherein the mass percent of each component is as follows: 0.7% of C, 6.5% of Cr, 1.8% of Ni, 0.7% of Si, 0.1% of Mn, 2.0% of Mo, 1.7% of V, 0.9% of W and the balance of Fe.
3. A cold work die steel material according to claim 1, characterized in that: wherein the mass percent of each component is as follows: 0.75% of C, 6.7% of Cr, 2.0% of Ni, 0.9% of Si, 0.3% of Mn, 2.25% of Mo, 1.95% of V, 1.1% of W and the balance of Fe.
4. A cold work die steel material according to claim 1, characterized in that: wherein the mass percent of each component is as follows: 0.8% of C, 7.0% of Cr, 2.2% of Ni, 1.2% of Si, 0.5% of Mn, 2.5% of Mo, 2.2% of V, 1.3% of W and the balance of Fe.
5. A manufacturing process for the cold-work die steel material as claimed in any one of claims 1 to 4 is characterized by comprising the following specific manufacturing steps:
s1, smelting, namely putting the raw materials into an induction furnace according to the mass percentage of the components contained in the cold-work die steel, heating and melting, carrying out vacuum smelting at the temperature of 1600-1700 ℃, and preserving heat for a period of time;
s2, casting and forging: casting the alloy obtained in the step S1, naturally cooling to form a steel ingot, and forging the formed steel ingot;
s3, spheroidizing annealing: heating the steel ingot forged in the step S2 to 800-850 ℃, preserving heat for 1.5-1.8h at the temperature, cooling the heated steel ingot to 680-720 ℃, preserving heat for 5-5.5h, cooling to 600 ℃ at constant speed, discharging and naturally cooling to room temperature;
s4, hardening and quenching: heating the steel ingot blank annealed in the step S3 to 1080-;
s5, toughness back quenching: and (4) heating the steel ingot quenched in the step S4 to 450-500 ℃ again for heat preservation treatment, then performing back quenching treatment on the steel ingot by using liquid nitrogen, and repeating the back quenching for 4-5 times to obtain the steel ingot of the mold.
6. The manufacturing process of the cold-work die steel material according to claim 5, characterized in that: in the step S1, the smelting time is set to be 1.5-2h, and the temperature in the heat preservation period and the temperature in the smelting period are kept the same.
7. The manufacturing process of the cold-work die steel material according to claim 5, characterized in that: the uniform cooling speed in the annealing in the step S3 is set to be 30-50 ℃/h, and the heat preservation time lengths of the two rounds in the spheroidizing annealing step are preferably 1.6h and 5.3h respectively.
8. The manufacturing process of the cold-work die steel material according to claim 5, characterized in that: in the step S5, the tough tempering is performed outside the furnace, and ventilation is performed with a ventilation fan of 500W or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110702497.1A CN113718170A (en) | 2021-06-24 | 2021-06-24 | Cold-work die steel material and manufacturing process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110702497.1A CN113718170A (en) | 2021-06-24 | 2021-06-24 | Cold-work die steel material and manufacturing process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113718170A true CN113718170A (en) | 2021-11-30 |
Family
ID=78672922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110702497.1A Pending CN113718170A (en) | 2021-06-24 | 2021-06-24 | Cold-work die steel material and manufacturing process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113718170A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002167644A (en) * | 2000-11-30 | 2002-06-11 | Daido Steel Co Ltd | Cold tool steel having constant deformation on treatment and method for producing cold tool using the steel |
| JP2004035920A (en) * | 2002-07-01 | 2004-02-05 | Sanyo Special Steel Co Ltd | Cold tool steel having excellent fatigue life and heat treatment method therefor |
| CN1824818A (en) * | 2006-01-25 | 2006-08-30 | 周向儒 | Cold extruding die steel and heat treatment technique thereof |
| JP2007056289A (en) * | 2005-08-23 | 2007-03-08 | Hitachi Metals Ltd | Tool steel stock for hardening |
-
2021
- 2021-06-24 CN CN202110702497.1A patent/CN113718170A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002167644A (en) * | 2000-11-30 | 2002-06-11 | Daido Steel Co Ltd | Cold tool steel having constant deformation on treatment and method for producing cold tool using the steel |
| JP2004035920A (en) * | 2002-07-01 | 2004-02-05 | Sanyo Special Steel Co Ltd | Cold tool steel having excellent fatigue life and heat treatment method therefor |
| JP2007056289A (en) * | 2005-08-23 | 2007-03-08 | Hitachi Metals Ltd | Tool steel stock for hardening |
| CN1824818A (en) * | 2006-01-25 | 2006-08-30 | 周向儒 | Cold extruding die steel and heat treatment technique thereof |
Non-Patent Citations (1)
| Title |
|---|
| 潘强等: "《工程材料 第2版》", 30 September 2005, 上海科学技术出版社 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100482842C (en) | High malleable high wear-resisting cold process mould steel | |
| CN102747293B (en) | High-speed steel for high-toughness high-abrasion resistance hobbing cutter and preparation method thereof | |
| CN101487103B (en) | Vanadium niobium composite alloying cold working die steel and preparation thereof | |
| CN101476082A (en) | High performance low cost hot work die steel | |
| JP2016037640A (en) | Nitride powder high speed tool steel excellent in abrasion resistance and manufacturing method therefor | |
| CN104451421A (en) | High-strength high-toughness bimetallic strip saw blade back steel and preparation method thereof | |
| JP2011510175A (en) | High alloy cold die steel | |
| CN109371330A (en) | A kind of high tenacity high-speed steel and its preparation process | |
| CN113737106B (en) | Die steel for 1500MPa hot stamping part cold trimming punching cutter and preparation method thereof | |
| CN113215489A (en) | High-strength-plasticity low-chromium nickel-saving type duplex stainless steel and stretching preparation method thereof | |
| CN111118383A (en) | Powder steel and preparation method thereof | |
| JP2005281857A (en) | Raw material for nitrided component having excellent broaching workability and method for manufacturing nitrided component using the raw material | |
| CN113718170A (en) | Cold-work die steel material and manufacturing process thereof | |
| CN112080704B (en) | High-toughness high-hardness cold and hot combined type die steel and preparation method thereof | |
| CN110484830B (en) | High-nitrogen hot-work die steel and preparation method thereof | |
| JP2755301B2 (en) | Tool steel for hot working | |
| CN112813361A (en) | Steel for hardware tools and preparation method thereof | |
| JP2001214238A (en) | Powder hot tool steel excellent in heat crack resistance and wear resistance and hot die | |
| CN111118276A (en) | Heat treatment process for ultra-deep quench-hardened cold roll | |
| CN100412220C (en) | Matrix steel for diamond sawblade | |
| CN108690935A (en) | A kind of high-quality alloy tool steel plate and production method | |
| JP4265819B2 (en) | Cold forging steel with excellent nitriding properties and method for producing the same | |
| CN115679194B (en) | Plastic mold steel plate and manufacturing method thereof | |
| JPH10298709A (en) | Tool steel for hot working excellent in wear resistance, and tool steel product | |
| CN110343963B (en) | Hot work die steel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211130 |
|
| RJ01 | Rejection of invention patent application after publication |