CN111575577B - Plastic die round steel and preparation method thereof - Google Patents
Plastic die round steel and preparation method thereof Download PDFInfo
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- CN111575577B CN111575577B CN202010337752.2A CN202010337752A CN111575577B CN 111575577 B CN111575577 B CN 111575577B CN 202010337752 A CN202010337752 A CN 202010337752A CN 111575577 B CN111575577 B CN 111575577B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- 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
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/06—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires
- C21D8/065—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of rods or wires of ferrous alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/001—Ferrous alloys, e.g. steel alloys containing N
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
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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
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
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Abstract
The invention relates to the technical field of die steel preparation, and discloses a plastic die round steel and a preparation method thereof. The plastic die round steel comprises, by taking the total weight of the plastic die round steel as 100%, 0.8-1% by weight of Si, 13.5-14% by weight of Cr, 0.4-0.5% by weight of Mo, 0.25-0.35% by weight of V, 0.2-0.3% by weight of Ni, 0.35-0.4% by weight of C, 0.03-0.06% by weight of N, 0.04% by weight or less of impurity elements and the balance of Fe. The plastic mould round steel has the characteristics of high strength and toughness, high hardness, high polishing performance and high corrosion resistance, does not need a complex electroslag remelting process, and fully meets the use requirement of a high-performance plastic mould.
Description
Technical Field
The invention relates to the technical field of die steel preparation, in particular to a plastic die round steel and a preparation method thereof.
Background
With the rapid development of the plastic industry and the continuous improvement of general and engineering plastics in the aspects of strength, precision and the like, the application range of plastic products is continuously expanded, the proportion of the plastic products is rapidly increased, and the consumption of round steel of a plastic mould is greatly increased.
When the plastic mould works, the plastic melt flows in the mould cavity under certain pressure, and the solidified plastic part is separated from the mould, which can cause friction and abrasion on the moulding surface of the mould. The performance of the die material and the pressure, temperature, material deformation speed, lubrication condition and the like of the die in the working process have influence on the service life of the die, and in addition, components containing chlorine, fluorine and the like are decomposed by heating to generate corrosive gases HC1 and HF, so that the cavity surface of the plastic die is corroded and abraded to cause failure.
Therefore, the current manufacturing industry has high requirements on the performance of the die material, and the die material has the characteristics of high strength, high toughness, high polishing performance and high corrosion resistance. 20Cr13 and 40Cr13 are the most widely used hot forging die steels, but they are inferior in that the former has better corrosion resistance but lower strength hardness, and the latter has higher strength hardness but poorer corrosion resistance. Meanwhile, in order to ensure the polishing performance and the corrosion resistance of steel products in the industry, the refining and electroslag remelting process is generally adopted and then is processed and formed, so that the cost is always high.
Therefore, how to design a refined plastic mold steel with better performance, simpler process and lower cost has become one of the focuses of great attention of many research and development enterprises and researchers at the same time.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a plastic die round steel and a preparation method thereof.
In order to achieve the above object, according to one aspect of the present invention, there is provided a plastic die round bar comprising 0.8 to 1 wt% of Si, 13.5 to 14 wt% of Cr, 0.4 to 0.5 wt% of Mo, 0.25 to 0.35 wt% of V, 0.2 to 0.3 wt% of Ni, 0.35 to 0.4 wt% of C, 0.03 to 0.06 wt% of N, 0.04 wt% or less of impurity elements, and the balance of iron, based on the total weight of the plastic die round bar taken as 100%.
Preferably, the plastic die round steel contains 0.82-0.98 wt% of Si, 13.6-13.9 wt% of Cr, 0.42-0.49 wt% of Mo, 0.27-0.34 wt% of V, 0.22-0.28 wt% of Ni, 0.352-0.39 wt% of C, 0.032-0.058 wt% of N, less than or equal to 0.04 wt% of impurity elements and the balance of Fe, based on the total weight of the plastic die round steel taken as 100%.
Preferably, the impurity element includes at least one of As, Sn, Pb, Sb, and Bi.
Preferably, the content of As is less than or equal to 0.02 wt%;
the content of Sn is less than or equal to 0.01 wt%;
the content of Pb is less than or equal to 0.01 wt%;
the content of Sb is less than or equal to 0.01 wt%;
the content of Bi is 0.01 wt% or less.
Preferably, the plastic die round steel further contains non-metallic inclusions.
Further preferably, the requirement of the A-type coarse system of the nonmetallic inclusions in the plastic mould round steel is less than or equal to 0.5;
the requirement of B-type coarse system of non-metallic inclusions in the plastic mould round steel is less than or equal to 1.0;
the B-type fine system requirement of the nonmetallic inclusions in the plastic die round steel is less than or equal to 1.5;
the requirement of C-type coarse system of non-metallic inclusions in the round steel of the plastic die is less than or equal to 0.5;
the requirement of C-type fine system of non-metallic inclusions in the round steel of the plastic die is less than or equal to 0.5;
the requirement of D-type coarse system of the nonmetallic inclusion in the round steel of the plastic die is less than or equal to 1.0;
the requirement of D-type fine system of the non-metallic inclusions in the round steel of the plastic die is less than or equal to 1.5.
The invention provides a method for preparing the plastic mould round steel, which comprises the following steps:
(1) the method comprises the following steps of sequentially carrying out electric furnace smelting, external furnace refining and vacuum degassing on raw materials to obtain a steel ingot, and controlling the oxygen content in the steel ingot to be less than 20ppm and the non-metallic inclusion to be less than or equal to 1.5 grade;
(2) carrying out quick forging on the steel ingot obtained in the step (1) to obtain an intermediate blank;
(3) and (3) sequentially carrying out precision forging and heat treatment on the intermediate blank obtained in the step (2) to obtain the plastic die round steel.
Preferably, in the step (2), the fast forging includes two times of upsetting-drawing forging and FM method forging;
further preferably, the total forging ratio of the quick forging is 8 or more;
further preferably, a homogenization treatment is required between the two upsetting forgings.
Preferably, in the step (3), the heat treatment is an isothermal spheroidizing annealing treatment;
preferably, the isothermal spheroidizing annealing process comprises a first heat preservation process and a second heat preservation process which are sequentially carried out;
further preferably, the conditions of the first soak process include: the temperature is 850 ℃ and 870 ℃, and the time is 11.5-12.5 h;
further preferably, the conditions of the second incubation process include: the temperature is 740 and 760 ℃, and the time is 14.5-15.5 h.
Preferably, in the step (3), the amount of deformation of the finish forging is 35 to 60%.
The invention provides a plastic mould round steel which has the characteristics of high strength and toughness, high hardness, high polishing performance and high corrosion resistance, does not need a complex electroslag remelting process, and fully meets the use requirement of a high-performance plastic mould.
Drawings
Fig. 1 is a metallographic photograph of the annealed microstructure of the round steel of the plastic mold prepared in example 1 at a magnification of 500.
Detailed Description
The following describes in detail specific embodiments of the present invention. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
All of the starting materials of the present invention, without particular limitation as to their source, may be purchased commercially or prepared according to conventional methods well known to those skilled in the art.
All the raw materials of the present invention are not particularly limited in purity, and the present invention preferably adopts a purity which is conventional in the field of industrial purity or mold steel production.
The invention provides a plastic mould round steel, which comprises 0.8-1 wt% of Si, 13.5-14 wt% of Cr, 0.4-0.5 wt% of Mo, 0.25-0.35 wt% of V, 0.2-0.3 wt% of Ni, 0.35-0.4 wt% of C, 0.03-0.06 wt% of N, less than or equal to 0.04 wt% of impurity elements and the balance of iron, wherein the total weight of the plastic mould round steel is 100%.
Preferably, the plastic die round steel contains 0.82-0.98 wt% of Si, 13.6-13.9 wt% of Cr, 0.42-0.49 wt% of Mo, 0.27-0.34 wt% of V, 0.22-0.28 wt% of Ni, 0.352-0.39 wt% of C, 0.032-0.058 wt% of N, 0.04 wt% or less of impurity elements and the balance of Fe, based on the total weight of the plastic die round steel taken as 100%.
Preferably, the impurity element includes at least one of As, Sn, Pb, Sb, and Bi.
More preferably, the content of As is 0.02 wt% or less; the content of Sn is less than or equal to 0.01 wt%; the content of Pb is less than or equal to 0.01 wt%; the content of Sb is less than or equal to 0.01 wt%; the content of Bi is 0.01 wt% or less.
The plastic mould round steel provided by the invention inevitably further comprises non-metallic inclusions, and in order to improve the performance of the plastic mould round steel, the non-metallic inclusions are preferably controlled within a specific range. The non-metallic inclusions in the plastic mould round steel are required to be less than or equal to 0.5 in the type A coarse system, and are required to be less than or equal to 1.0 in the type B coarse system; the B-type fine system requirement of the nonmetallic inclusions in the plastic die round steel is less than or equal to 1.5; the requirement of C-type coarse system of non-metallic inclusions in the round steel of the plastic die is less than or equal to 0.5; the requirement of C-type fine system of non-metallic inclusions in the round steel of the plastic die is less than or equal to 0.5; the requirement of D-type coarse system of the nonmetallic inclusion in the round steel of the plastic die is less than or equal to 1.0; the requirement of D-type fine system of the non-metallic inclusions in the round steel of the plastic die is less than or equal to 1.5.
According to the invention, on the element components, the low-C high-Si is adopted to combine the microalloying effect of Cr, Mo, Ni and V and a proper amount of nitrogen is added, so that the Si content is controlled, the corrosion resistance of the steel in an oxidizing medium is improved, and the pitting corrosion tendency of the stainless steel in a chloride ion medium can be inhibited. Adding composite microalloying to improve the corrosion resistance, hardenability, toughness and grain refinement; the content of C is reduced, the corrosion resistance of the steel is improved while the strength of the steel is ensured, the cutting processability can be improved by controlling the content of N, and the strength and the corrosion resistance of the steel are further improved.
The invention provides a method for preparing the plastic mould round steel, which comprises the following steps:
(1) the method comprises the following steps of sequentially carrying out electric furnace smelting, external furnace refining and vacuum degassing on raw materials to obtain a steel ingot, and controlling the oxygen content in the steel ingot to be less than 20ppm and the non-metallic inclusion to be less than or equal to 1.5 grade;
(2) carrying out quick forging on the steel ingot obtained in the step (1) to obtain an intermediate blank;
(3) and (3) sequentially carrying out precision forging and heat treatment on the intermediate blank obtained in the step (2) to obtain the plastic die round steel.
In the method, the modes of the electric furnace, the external refining and the vacuum degassing are adopted, so that the purity can be improved, and the gas content in the steel ingot can be reduced.
The parameters and steps of the rapid forging are not particularly limited, and the parameters and steps of the rapid forging known by the skilled in the art can be selected and adjusted by the skilled in the art according to the actual production condition, the product requirement and the quality requirement. Preferably, the quick forging comprises two times of upsetting-drawing forging and FM method forging; the total forging ratio of the quick forging is more than or equal to 8; homogenization treatment is also needed between the two times of heading forging.
In a specific embodiment, the rapid forging is performed in a 45MN press.
In the method of the present invention, in the step (3), preferably, the heat treatment is an isothermal spheroidizing annealing treatment.
Further preferably, the isothermal spheroidizing annealing process includes a first heat preservation process and a second heat preservation process which are sequentially performed.
Still further preferably, the conditions of the first soak process include: the temperature is 850 ℃ and 870 ℃, and the time is 11.5-12.5 h.
Still further preferably, the conditions of the second incubation process include: the temperature is 740 and 760 ℃, and the time is 14.5-15.5 h.
Preferably, in the step (3), the amount of deformation of the finish forging is 35 to 60%.
In a specific embodiment, the precision forging is performed in an 18MN precision forging machine.
The plastic mould round steel has the characteristics of high strength and toughness, high hardness, high polishing performance and high corrosion resistance, does not need a complex electroslag remelting process, and fully meets the use requirement of a high-performance plastic mould.
The present invention will be described in detail by way of examples, but the scope of the present invention is not limited thereto.
Example 1
The process flow comprises the following steps: electric furnace + external refining + vacuum degassing → 45MN press rapid forging → 18MN fine forging finished material → heat treatment → inspection
The method comprises the following specific steps: (1) smelting the raw materials in an electric furnace, then refining outside the furnace to perform deep deoxidation and desulfurization, adjusting components, then performing vacuum degassing treatment, and pouring to obtain a steel ingot, wherein the oxygen content in the steel ingot is controlled to be less than 20ppm, and the content of nonmetallic inclusions is controlled to be less than or equal to 1.5 grade;
(2) carrying out quick forging on the steel ingot obtained in the step (1) in a 45MN press, carrying out quick forging by adopting twice upsetting-drawing forging and FM forging, and controlling the total forging ratio to be more than or equal to 8 to obtain an intermediate blank; homogenizing treatment is required between the two times of upsetting forging;
(3) carrying out precision forging on the intermediate blank obtained in the step (2) in an 18MN precision forging machine, controlling the deformation amount to be 40%, and then carrying out isothermal spheroidizing annealing treatment to obtain plastic die round steel A1 with the specification of phi 300 mm; wherein the isothermal spheroidizing annealing treatment comprises a first heat preservation process (the temperature is 850-870 ℃ and the time is 12 hours) and a second heat preservation process (the temperature is 740-760 ℃ and the time is 15 hours) which are sequentially carried out.
The chemical composition test results of the plastic die round steel a1 are shown in table 1.
TABLE 1
Example 2
The process flow comprises the following steps: electric furnace + external refining + vacuum degassing → 45MN press rapid forging → 18MN fine forging finished material → heat treatment → inspection
The method comprises the following specific steps: (1) smelting the raw materials in an electric furnace, then refining outside the furnace to perform deep deoxidation and desulfurization, adjusting components, then performing vacuum degassing treatment, and pouring to obtain a steel ingot, wherein the oxygen content in the steel ingot is controlled to be less than 20ppm, and the content of nonmetallic inclusions is controlled to be less than or equal to 1.5 grade;
(2) carrying out quick forging on the steel ingot obtained in the step (1) in a 45MN press, carrying out quick forging by adopting twice upsetting-drawing forging and FM forging, and controlling the total forging ratio to be more than or equal to 8 to obtain an intermediate blank; homogenizing treatment is required between the two times of upsetting forging;
(3) carrying out precision forging on the intermediate blank obtained in the step (2) in an 18MN precision forging machine, controlling the deformation amount to be 45%, and then carrying out isothermal spheroidizing annealing treatment to obtain plastic die round steel A2 with the specification of phi 300 mm; wherein the isothermal spheroidizing annealing treatment comprises a first heat preservation process (the temperature is 850-870 ℃ and the time is 12 hours) and a second heat preservation process (the temperature is 740-760 ℃ and the time is 15 hours) which are sequentially carried out.
The chemical composition test results of the plastic die round steel a2 are shown in table 2.
TABLE 2
Example 3
The process flow comprises the following steps: electric furnace + external refining + vacuum degassing → 45MN press rapid forging → 18MN fine forging finished material → heat treatment → inspection
The method comprises the following specific steps: (1) smelting the raw materials in an electric furnace, then refining outside the furnace to perform deep deoxidation and desulfurization, adjusting components, then performing vacuum degassing treatment, and pouring to obtain a steel ingot, wherein the oxygen content in the steel ingot is controlled to be less than 20ppm, and the content of nonmetallic inclusions is controlled to be less than or equal to 1.5 grade;
(2) carrying out quick forging on the steel ingot obtained in the step (1) in a 45MN press, carrying out quick forging by adopting twice upsetting-drawing forging and FM forging, and controlling the total forging ratio to be more than or equal to 8 to obtain an intermediate blank; homogenizing treatment is required between the two times of upsetting forging;
(3) carrying out precision forging on the intermediate blank obtained in the step (2) in an 18MN precision forging machine, controlling the deformation amount to be 50%, and then carrying out isothermal spheroidizing annealing treatment to obtain plastic die round steel A3 with the specification of phi 300 mm; wherein the isothermal spheroidizing annealing treatment comprises a first heat preservation process (the temperature is 850-870 ℃ and the time is 12 hours) and a second heat preservation process (the temperature is 740-760 ℃ and the time is 15 hours) which are sequentially carried out.
The chemical composition test results of the plastic die round steel a3 are shown in table 3.
TABLE 3
Test example
1. The results of examining nonmetallic inclusions in the plastic die round steels obtained in examples 1 to 3 are shown in Table 4. According to the provisions of GB10561-2005 for microscopic evaluation of nonmetallic inclusions in steel, the inclusions are classified into A, B, C, D four types according to their morphology and distribution, each type of inclusions is classified into coarse type and fine type according to the difference of thickness or diameter, the coarse type and the fine type are classified into 1-5 grades according to the number, and the higher the grade is, the higher the inclusion content is. Wherein, A is sulfide long-strip-shaped inclusion, B is alumina broken-block string-shaped inclusion, C is silicate inclusion, and D is oxide inclusion in spherical dispersion distribution. The numbers 0.5, 1.0, 1.5, etc. are the ratings of various types of inclusions.
TABLE 4
2. The round steel for plastic molds prepared in examples 1 to 3 was examined for an annealed microstructure at 500 times, and the microstructure was rated according to a BOHLER standard rating chart, with the results shown in table 5; fig. 1 shows a metallographic photograph of an annealed microstructure of the plastic die round steel a 1.
TABLE 5
| Annealed microstructure | |
| The use requirement of the high-performance plastic mold | A1-A4,B1-B2,C1-C2 |
| Example 1 | A1 |
| Example 2 | A1 |
| Example 3 | A1 |
3. And (3) impact toughness test: the transverse impact sample blank is subjected to oil quenching at 1030 ℃ for 30min and tempering at 230 ℃ for 120min for 2 times, is processed into 7 x 10 x 55 unnotched impact samples after being subjected to heat treatment to 49-53HRC hardness, and is subjected to a pendulum impact toughness test. The test results of examples 1-3 are shown in Table 6.
TABLE 6
| Rockwell hardness | Mean value of | |
| The use requirement of the high-performance plastic mold | 49-53 | ≥60 |
| Example 1 | 51-52 | 110 |
| Example 2 | 52-53 | 115 |
| Example 3 | 51-52 | 105 |
4. And (3) tensile test: and (3) performing oil quenching at 1030 ℃ for 30min and tempering at 230 ℃ for 120min for 2 times on the sample blank, performing heat treatment to 49-53HRC hardness, and performing a room temperature tensile test. The test results of examples 1-3 are shown in Table 7.
TABLE 7
| Tensile Strength Rm (MPa) | Yield strength Rp0.2(MPa) | Extension | |
| The use requirement of the high-performance plastic mold | ≥1400 | ≥1180 | ≥6％ |
| Example 1 | 1822 | 1393 | 8.5％ |
| Example 2 | 1876 | 1436 | 8.8％ |
| Example 3 | 1842 | 1408 | 8.9％ |
5. Grain size test: and (3) preserving the temperature of the grain size sample at 1030 +/-10 ℃ for 30 minutes, and carrying out oil quenching to room temperature. The results of the tests of examples 1-3, rated according to GB/T6394, are shown in Table 8.
TABLE 8
| Grain size (grade) | |
| The use requirement of the high-performance plastic mold | ≥7 |
| Example 1 | 8.5-9.5 |
| Example 2 | 8.5-9.5 |
| Example 3 | 8.5-9.5 |
6. And (3) corrosion resistance testing: a salt spray corrosion test was carried out under the same conditions for 48 hours at a NaCl concentration of 50g/L and a test temperature of 35 ℃. The test results of examples 1-3 show that no corrosion occurs and the corrosion resistance is comparable to that of imported S136 steel.
7. Roughness: the round steel polished bottle molds of the plastic molds of examples 1 to 3 were examined using a roughness meter and measured to have a roughness of 0.015 to 0.020 μm.
The test results show that the plastic mould round steel meets the use requirements of high-performance plastic moulds and has the characteristics of high strength and toughness, high hardness, high polishing performance and high corrosion resistance.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (7)
1. The plastic die round steel is characterized by comprising 0.82-0.98 wt% of Si, 13.6-13.9 wt% of Cr, 0.42-0.49 wt% of Mo, 0.27-0.34 wt% of V, 0.22-0.28 wt% of Ni, 0.352-0.39 wt% of C, 0.032-0.058 wt% of N, less than or equal to 0.04 wt% of impurity elements and the balance of iron, wherein the total weight of the plastic die round steel is 100%;
the impurity element includes at least one of As, Sn, Pb, Sb and Bi;
the method for preparing the plastic mould round steel comprises the following steps:
(1) the method comprises the following steps of sequentially carrying out electric furnace smelting, external furnace refining and vacuum degassing on raw materials to obtain a steel ingot, and controlling the oxygen content in the steel ingot to be less than 20ppm and the non-metallic inclusion to be less than or equal to 1.5 grade;
(2) carrying out quick forging on the steel ingot obtained in the step (1) to obtain an intermediate blank;
(3) sequentially carrying out precision forging and heat treatment on the intermediate blank obtained in the step (2) to obtain a plastic die round steel;
in the step (2), the quick forging comprises two times of upsetting-drawing forging and FM method forging;
in the step (3), the heat treatment is isothermal spheroidizing annealing; the isothermal spheroidizing annealing process comprises a first heat preservation process and a second heat preservation process which are sequentially carried out; the conditions of the first heat-preserving process comprise: the temperature is 850 ℃ and 870 ℃, and the time is 11.5-12.5 h; the conditions of the second heat preservation process comprise: the temperature is 740 and 760 ℃, and the time is 14.5-15.5 h.
2. The plastic die round steel As claimed in claim 1, wherein the content of As is 0.02 wt% or less;
the content of Sn is less than or equal to 0.01 wt%;
the content of Pb is less than or equal to 0.01 wt%;
the content of Sb is less than or equal to 0.01 wt%;
the content of Bi is 0.01 wt% or less.
3. The plastic die round bar of claim 1, wherein the plastic die round bar further comprises non-metallic inclusions.
4. The plastic die round steel as claimed in claim 3, wherein the non-metallic inclusions in the plastic die round steel have a class A coarse requirement of 0.5 or less;
the requirement of B-type coarse system of non-metallic inclusions in the plastic mould round steel is less than or equal to 1.0;
the B-type fine system requirement of the nonmetallic inclusions in the plastic die round steel is less than or equal to 1.5;
the requirement of C-type coarse system of non-metallic inclusions in the round steel of the plastic die is less than or equal to 0.5;
the requirement of C-type fine system of non-metallic inclusions in the round steel of the plastic die is less than or equal to 0.5;
the requirement of D-type coarse system of the nonmetallic inclusion in the round steel of the plastic die is less than or equal to 1.0;
the requirement of D-type fine system of the non-metallic inclusions in the round steel of the plastic die is less than or equal to 1.5.
5. The plastic die round steel as claimed in claim 1, wherein the total forging ratio of the quick forging is 8 or more.
6. The plastic die round steel as claimed in claim 1, wherein a homogenization treatment is further required between the two upsetting forgings.
7. The plastic die round steel as claimed in claim 1, wherein in step (3), the amount of deformation of the finish forging is 35-60%.
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