CN113652527A - Production process of plastic die steel - Google Patents
Production process of plastic die steel Download PDFInfo
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- CN113652527A CN113652527A CN202110933137.2A CN202110933137A CN113652527A CN 113652527 A CN113652527 A CN 113652527A CN 202110933137 A CN202110933137 A CN 202110933137A CN 113652527 A CN113652527 A CN 113652527A
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- 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
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- 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
- C21D6/008—Heat treatment of ferrous alloys containing Si
-
- 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
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0068—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for particular articles not mentioned below
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- 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
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- 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
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- 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
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
- C23C8/24—Nitriding
- C23C8/26—Nitriding of ferrous surfaces
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Heat Treatment Of Articles (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
Abstract
The invention discloses a production process of plastic die steel, which comprises the following production steps: taking a 3Cr2MnNiMo steel billet as a raw material, firstly sawing and roughly processing, then quenching at 860 +/-10 ℃, tempering at 500 +/-10 ℃, then finely processing, and finally nitriding. The invention has the advantages that: the cutting processing performance and the corrosion resistance can be improved; the hardness of the plastic die steel can reach 30-38 HRC through quenching and tempering heat treatment, a product with a lower surface roughness value can be obtained when the plastic die steel with the hardness is subjected to fine processing, and finally the hardness of the plastic die steel with the depth of 4mm can reach 45-50 HRC through nitriding treatment, so that the wear resistance of the plastic die steel is improved.
Description
Technical Field
The invention relates to a production process of plastic die steel.
Background
At present, general plastic die steel is manufactured by quenching and tempering normalized 45 Cr and 40Cr, so that the die is low in hardness, poor in wear resistance, high in surface roughness value, poor in appearance quality of processed plastic products, and low in service life, and the precision plastic die and the plastic die with high hardness are manufactured by alloy tool steel such as CrWMo, Cr12MoV and the like, but the steel is poor in machining performance, complex cavities are difficult to process, and the problems of heat treatment deformation and the like cannot be solved.
Disclosure of Invention
The invention aims to provide a production process of plastic die steel, which can obtain the plastic die steel with good machining performance, high hardness, wear resistance and long service life.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows: the production process of the plastic die steel comprises the following production steps:
taking a 3Cr2MnNiMo steel billet as a raw material, firstly sawing the steel billet into a rectangular workpiece, and reserving a machining allowance of 3-5 mm on the workpiece;
six surfaces of a rectangular workpiece are milled, 1-1.5 mm of machining allowance is reserved, and the verticality of the six surfaces is corrected;
quenching: heating a rectangular workpiece to 350 ℃ and preserving heat for 1h, heating the rectangular workpiece at 350 ℃ to 650 ℃ and preserving heat for 1h, heating the rectangular workpiece at 650 ℃ to 860 +/-10 ℃ and preserving heat for 1-1.5 h, and finally placing the rectangular workpiece into quenching liquid for rapid cooling;
tempering: heating the rectangular workpiece to 350 ℃ and preserving heat for 1h, then heating the rectangular workpiece at 350 ℃ to 500 +/-10 ℃ and preserving heat for 1-1.5 h, then discharging and air cooling to room temperature;
finely processing the rectangular workpiece after heat treatment to obtain a finished product meeting the production requirement;
and (3) placing the finished product into a nitriding furnace, discharging and diluting air in the nitriding furnace by using ammonia gas, dissolving urea into industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, keeping the temperature for 24 hours, and cooling to room temperature.
Further, in the production process of the plastic die steel, the 3Cr2MnNiMo plastic die steel billet comprises the following chemical components in percentage by weight: 0.30-0.35% of C, 1.1-1.5% of Mn, 0.85-1% of Ni, 0.2-0.3% of Si, 0.3-0.4% of Mo, 1.7-2% of Cr, 0.1-0.2% of Cu, less than or equal to 0.015% of P, less than or equal to 0.007% of S and the balance of Fe.
Further, in the production process of the plastic die steel, the 3Cr2MnNiMo plastic die steel billet comprises the following chemical components in percentage by weight: 0.4 percent of C, 1.35 percent of Mn, 0.95 percent of Ni, 0.22 percent of Si, 0.35 percent of Mo, 1.78 percent of Cr, 0.15 percent of Cu, 0.015 percent of P, 0.007 percent of S and the balance of Fe.
Further, in the production process of the plastic die steel, the heating rate of the rectangular workpiece does not exceed 150 ℃/h in the quenching and tempering processes.
The invention has the advantages that: s in the 3Cr2MnNiMo plastic die steel can form sulfides, and the sulfides play a role in wrapping hard points in the steel, so that the abrasion to a cutting tool is reduced, and the cutting processability is improved; cu of the 3Cr2MnNiMo plastic die steel can improve the corrosion resistance of the 3Cr2MnNiMo plastic die steel; the hardness of the 3Cr2MnNiMo plastic die steel can reach 30-38 HRC through quenching and tempering heat treatment, a product with a lower surface roughness value can be obtained when the 3Cr2MnNiMo plastic die steel with the hardness is subjected to fine machining, and finally the hardness of the 3Cr2MnNiMo plastic die steel with the depth of 4mm can reach 45-50 HRC through nitriding treatment, so that the wear resistance of the 3Cr2MnNiMo plastic die steel is improved.
Detailed Description
The technical solution of the present invention is further illustrated by the following examples.
The first embodiment is as follows:
the production process of the plastic die steel comprises the following production steps:
taking a 3Cr2MnNiMo steel billet as a raw material, wherein the 3Cr2MnNiMo plastic die steel billet comprises the following chemical components in percentage by weight: 0.30-0.35 percent of C, 1.1-1.5 percent of Mn, 0.85-1 percent of Ni, 0.2-0.3 percent of Si, 0.3-0.4 percent of Mo, 1.7-2 percent of Cr, 0.1-0.2 percent of Cu, less than or equal to 0.015 percent of P, less than or equal to 0.007 percent of S and the balance of Fe; firstly, sawing a steel billet into a rectangular workpiece, and reserving a machining allowance of 3-5 mm on the workpiece;
six surfaces of a rectangular workpiece are milled, 1-1.5 mm of machining allowance is reserved, and the verticality of the six surfaces is corrected;
quenching: heating the rectangular workpiece to 350 ℃ at a heating rate of not more than 150 ℃/h, preserving heat for 1h, heating the rectangular workpiece at 350 ℃ to 650 ℃ and preserving heat for 1h, heating the rectangular workpiece at 650 ℃ to 860 +/-10 ℃ and preserving heat for 1-1.5 h, and finally placing the rectangular workpiece into quenching liquid for rapid cooling;
tempering: heating the rectangular workpiece to 350 ℃ at a heating rate of not more than 150 ℃/h, preserving heat for 1h, then heating the rectangular workpiece at 350 ℃ to 500 +/-10 ℃, preserving heat for 1-1.5 h, then discharging and air cooling to room temperature;
finely processing the rectangular workpiece after heat treatment to obtain a finished product meeting the production requirement;
and (3) placing the finished product into a nitriding furnace, discharging and diluting air in the nitriding furnace by using ammonia gas, dissolving urea into industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, keeping the temperature for 24 hours, and cooling to room temperature.
Example two:
the production process of the plastic die steel comprises the following production steps:
taking a 3Cr2MnNiMo steel billet as a raw material, wherein the 3Cr2MnNiMo plastic die steel billet comprises the following chemical components in percentage by weight: 0.4 percent of C, 1.35 percent of Mn, 0.95 percent of Ni, 0.22 percent of Si, 0.35 percent of Mo, 1.78 percent of Cr, 0.15 percent of Cu, 0.015 percent of P, 0.007 percent of S and the balance of Fe; firstly, sawing a steel billet into a rectangular workpiece, and reserving a machining allowance of 3-5 mm on the workpiece;
six surfaces of a rectangular workpiece are milled, 1-1.5 mm of machining allowance is reserved, and the verticality of the six surfaces is corrected;
quenching: heating the rectangular workpiece to 350 ℃ at a heating rate of not more than 150 ℃/h, preserving heat for 1h, heating the rectangular workpiece at 350 ℃ to 650 ℃ and preserving heat for 1h, heating the rectangular workpiece at 650 ℃ to 860 +/-10 ℃ and preserving heat for 1-1.5 h, and finally placing the rectangular workpiece into quenching liquid for rapid cooling;
tempering: heating the rectangular workpiece to 350 ℃ at a heating rate of not more than 150 ℃/h, preserving heat for 1h, then heating the rectangular workpiece at 350 ℃ to 500 +/-10 ℃, preserving heat for 1-1.5 h, then discharging and air cooling to room temperature;
finely processing the rectangular workpiece after heat treatment to obtain a finished product meeting the production requirement;
and (3) placing the finished product into a nitriding furnace, discharging and diluting air in the nitriding furnace by using ammonia gas, dissolving urea into industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, keeping the temperature for 24 hours, and cooling to room temperature.
The invention has the advantages that: s in the 3Cr2MnNiMo plastic die steel can form sulfides, and the sulfides play a role in wrapping hard points in the steel, so that the abrasion to a cutting tool is reduced, and the cutting processability is improved; cu of the 3Cr2MnNiMo plastic die steel can improve the corrosion resistance of the 3Cr2MnNiMo plastic die steel; the hardness of the 3Cr2MnNiMo plastic die steel can reach 30-38 HRC through quenching and tempering heat treatment, a product with a lower surface roughness value can be obtained when the 3Cr2MnNiMo plastic die steel with the hardness is subjected to fine machining, and finally the hardness of the 3Cr2MnNiMo plastic die steel with the depth of 4mm can reach 45-50 HRC through nitriding treatment, so that the wear resistance of the 3Cr2MnNiMo plastic die steel is improved.
Claims (4)
1. The production process of the plastic die steel is characterized by comprising the following steps: the production steps are as follows:
taking a 3Cr2MnNiMo steel billet as a raw material, firstly sawing the steel billet into a rectangular workpiece, and reserving a machining allowance of 3-5 mm on the workpiece;
six surfaces of a rectangular workpiece are milled, 1-1.5 mm of machining allowance is reserved, and the verticality of the six surfaces is corrected;
quenching: heating a rectangular workpiece to 350 ℃ and preserving heat for 1h, heating the rectangular workpiece at 350 ℃ to 650 ℃ and preserving heat for 1h, heating the rectangular workpiece at 650 ℃ to 860 +/-10 ℃ and preserving heat for 1-1.5 h, and finally placing the rectangular workpiece into quenching liquid for rapid cooling;
tempering: heating the rectangular workpiece to 350 ℃ and preserving heat for 1h, then heating the rectangular workpiece at 350 ℃ to 500 +/-10 ℃ and preserving heat for 1-1.5 h, then discharging and air cooling to room temperature;
finely processing the rectangular workpiece after heat treatment to obtain a finished product meeting the production requirement;
and (3) placing the finished product into a nitriding furnace, discharging and diluting air in the nitriding furnace by using ammonia gas, dissolving urea into industrial alcohol, dripping the industrial alcohol mixed with the urea into the nitriding furnace, heating the nitriding furnace to 650 ℃ when the air content in the furnace is lower than 8% or the discharged gas contains more than 90% of ammonia gas, keeping the temperature for 24 hours, and cooling to room temperature.
2. The process for producing plastic mold steel according to claim 1, wherein: the 3Cr2MnNiMo plastic die steel billet comprises the following chemical components in percentage by weight: 0.30-0.35% of C, 1.1-1.5% of Mn, 0.85-1% of Ni, 0.2-0.3% of Si, 0.3-0.4% of Mo, 1.7-2% of Cr, 0.1-0.2% of Cu, less than or equal to 0.015% of P, less than or equal to 0.007% of S and the balance of Fe.
3. A process for producing a plastic mould steel according to claim 2, characterised in that: the 3Cr2MnNiMo plastic die steel billet comprises the following chemical components in percentage by weight: 0.4 percent of C, 1.35 percent of Mn, 0.95 percent of Ni, 0.22 percent of Si, 0.35 percent of Mo, 1.78 percent of Cr, 0.15 percent of Cu, 0.015 percent of P, 0.007 percent of S and the balance of Fe.
4. A process for producing a plastic mould steel according to claim 1, 2 or 3, characterised in that: in the quenching and tempering processes, the heating rate of the rectangular workpiece is not more than 150 ℃/h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110933137.2A CN113652527A (en) | 2021-08-14 | 2021-08-14 | Production process of plastic die steel |
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| CN202110933137.2A CN113652527A (en) | 2021-08-14 | 2021-08-14 | Production process of plastic die steel |
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| CN113652527A true CN113652527A (en) | 2021-11-16 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115786650A (en) * | 2022-11-21 | 2023-03-14 | 新余华峰特钢有限公司 | Continuous casting round billet processing method of large-size Cr12MoV die steel |
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| CN115786650A (en) * | 2022-11-21 | 2023-03-14 | 新余华峰特钢有限公司 | Continuous casting round billet processing method of large-size Cr12MoV die steel |
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Application publication date: 20211116 |
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