CN101230442A - Low-alloy untempered steel for plastic mould frame steel and method for manufacturing same - Google Patents
Low-alloy untempered steel for plastic mould frame steel and method for manufacturing same Download PDFInfo
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Abstract
The invention provides a prehardened low alloy non-quenched-and-tempered steel used for a plastic mould base and the manufacturing method thereof. The mass percentage for the chemical components of the low alloy non-quenched-and-tempered steel is as follows: C 0.30 to 0.40 percent, Si 0.20 to 0.70 percent, Mn 1.00 to 1.50 percent, P less than or equal to 0.030 percent, S less than or equal to 0.025 percent, Cr 1.00 to 1.50 percent, Mo 0.10 to 0.30 percent, Ni 0.10 to 0.30 percent and Ti 0.010 to 0.030 percent. The prehardened rigidity is 24 to 29 HRC, which can guarantee the rigidity demanded by the mould steel material and the rigidity demanded by the mould steel material as well. Simultaneously, the technique of quenching and tempering can be omitted and users can use the mould steel material directly by cutting through a saw. Therefore, the manufacturing cost is reduced and the production efficiency is improved for both suppliers and demanders to obtain the non-quenched-and-tempered steel used material for a top-quality plastic mould base.
Description
Technical field
The present invention relates to a kind of frame steel of plastic mould and manufacture method thereof, particularly, the present invention relates to a kind of like this frame steel of plastic mould and manufacture method thereof, described frame steel of plastic mould belongs to a kind of low-alloy non-hardened and tempered steel, described frame steel of plastic mould blank nationality can directly obtain the hardness that requires by rolling the back air cooling, can handle without Q-tempering directly be processed into mould bases.Described frame steel of plastic mould is fit to make the die frame and the plastic mold cavity of high-grade plastics.
Background technology
The fast development of plastic article industry has made mould of plastics become a considerable industry.
Mould is made up of mould bases and core rod and related accessory, and mould bases and accessory are carried out selective by series specification commonly used by the producer of specialty, and core rod processing and assembling are generally only done by mould factory.The various differences of mould mainly are at core rod, at difform product, the die design personnel are designed to various forms to core rod, as: some charging, straight charging, stalking material, slide block, loose core, directly eject, push pedal ejects, secondary ejects, hot runner, gas are auxiliary etc., its objective is in order intactly to deviate from mould, also will consider the life-span of core rod simultaneously in workability that adds man-hour and mould use by product design requirement moulding and convenience.
The steel that the mould each several part is used are had nothing in common with each other, mould bases is generally used medium carbon steel 45# or 50#, accessory high carbon steel heat treated, the steel of core rod are with the complicated steel alloy of composition, perhardened steel and heat-treated steel and minute surface steel etc. are arranged, the trade mark of country's usefulness that they are different has nothing in common with each other, as: NAK80,718, SKD61 (Japan) P20, H13, (U.S.) 2344,2738 (Germany) S136,8407 (Switzerland) etc.
Now say the quality of die quality usually, the key distinction is in the processing precise degree of core rod and the work-ing life repeatedly of mould, and this relies on accurate processing units and reasonably moulding stock and structural design again to a great extent.
The plastics mould bases is the most important standardized component of mould.The plastics mould bases is divided into modified mould bases and non-modified mould bases with the material state.Domestic plastics mould bases is a mould material with 45 steel or 40Cr steel all.Dual mode appears in mould bases manufacturer in the use, a kind ofly mould bases is heat-treated " modified " handles, and with the raising that realizes its hardness and good metallographic structure, thereby improves the wearing quality and the stability of mould.Another kind of mode considers that then heat treatment step need increase facility investment, increases factors such as production cost, does not therefore adopt modifier treatment, but directly carries out mould bases production at mould base sawing.The plastics mould bases hardness that this mode is produced is on the low side, and fluctuation is big, and poor durability can not satisfy the specification of quality of high-grade plastics mould bases.
Middle carbon 45 steel are with the delivery of hot rolling and air cooling state, and most users do not have special requirement to hardness, generally just can directly use without modifier treatment, and its hardness is about 180～200HB.But improve its use properties as desire, then need carry out modifier treatment.The individual user uses hardness can reach 22～26HRC through after modified.The characteristic of middle carbon 45 steel is: hardening capacity is poor, and intensity is general, wear no resistance, but low price, machinability is good, usually, is applicable to parts such as making medium and small low-grade mould of plastics and mould bases.
The 40Cr steel is typical quenched and tempered steel, is one of most popular steel grade in the machinery manufacturing industry.According to purposes, the 40Cr steel often needs through modifier treatment.The 40Cr steel has good comprehensive mechanical properties after modifier treatment.Its characteristic is: the hardening capacity of steel is good, and cutting ability is better.The 40Cr steel is suitable for making medium-sized mould of plastics, and performance is better than 45 steel.
The chemical ingredients of 45 steel and 40Cr steel is shown in table 1.
Table 1 (%):
| The trade mark | C | Mn | Si | Cr | S | P |
| 45 | 0.42～ 0.50 | 0.50～ 0.80 | 0.17～ 0.37 | ≤0.25 | ≤0.035 | ≤0.035 |
| 40Cr | 0.37～ 0.44 | 0.50～ 0.80 | 0.17～ 0.37 | 0.80～ 1.10 | ≤0.035 | ≤0.035 |
The material that present high-grade mould bases uses mainly is 45 or the quenched and tempered steel of 40Cr.If described material is carried out modifier treatment, then exist complex procedures, cost to increase environmental pollution problems by the user.The material that uses along with high-grade mould bases to 45 or the modified requirement of 40Cr steel improve day by day, the user wishes day by day that also manufacturer can provide the pre-hard mold steel of direct use.
In order to satisfy user's requirement,, at present, two kinds of schemes are arranged for the user provides the pre-hard mold steel that can directly use, need not carry out modifier treatment once again.The first is directly supplied quenched and tempered steel.But steel mill must have relevant series of heat treatment facility.It two is to develop non-modified pre-hard mold steel.
Application number is that " CN86101988 ", denomination of invention disclose a kind of manufacturing precise plastic mould steel for the Chinese patent of " plastic die steel ".Described manufacturing precise plastic mould steel is a kind of high alloy timeliness mold steel, its hardness height (HRC43～48).Its composition is: C≤0.06%; Ni5.5～6.5%; Cr1.30～1.60%; Mo0.90～1.20; Ti0.90～1.30%; Al0.30～0.90%; V0.08～0.16%; Mn≤0.50%; Si; ≤ 0.50.Its HRC reaches 43～48.
Application number is that " CN86103713 ", denomination of invention are openly a kind of like this sulfur calcium composite plastic mould steel of Chinese patent of " easy cutting and high tougness die steel for plastics ", described sulfur calcium composite plastic mould steel is under pre-hard state (HRC30～45), can carry out various machining smoothly, and have higher toughness.Nationality is by adopting electric arc furnace smelting, and injection metallurgy adds technologies such as calcium, and described sulfur calcium composite plastic mould steel is suitable for the mould of plastics of doing large, medium and small shape and chamber shape complexity.The basal component of described sulfur calcium composite plastic mould steel is as follows:
S 0.04～0.20%, and Ca 0.002～0.02%, and C 0.30～0.65%, Ni0.30～2.00% and an amount of Mn, Cr, Mo, V, Si, surplus are Fe.This is the easy cutting plastic mold steel that a kind of eaf process is produced, and its hardness HRC reaches 30～45.
Application number is " CN98111772.4 ", denomination of invention disclose a kind of microalloying bainite type plastic die steel for the Chinese patent application of a " a kind of manufacture method of microalloyed plastic-mould steel " manufacture method.The chemical ingredients (weight %) of described microalloying bainite type plastic die steel is as follows:
C 0.20～0.30，Si0.10～0.60，Mn1.7～2.5，P0.035～0.08，S0.01～0.04，Mo0.20～0.50，V0.05～0.20，B0.0005～0.0050，Ca0.0005～0.010，N0.0050～0.0080，Ti/N＝3～4。
This is a kind of non-quenching and tempering plastic mold steel, but the composition design is different.
Again, application number is that " CN200410053281.3 ", denomination of invention disclose a kind of bainite large-section plastic mould steel and manufacture method thereof, the chemical ingredients of described bainite large-section plastic mould steel following (weight %) for the Chinese patent application of " a kind of bainite large-section plastic mould steel and manufacture method thereof ":
C 0.05～0.19％，Si 0.10～0.60％，Mn 1.0～1.65％，V 0.04～0.20％，Cr 1.0～1.70％，Mo 0.15～0.50％，P≤0.02％，S≤0.01％，Ni 0～0.50％，N≤0.01％，Ti 0.005～0.025％，Ca 0～0.0050％，Al 0.01～0.04％。Described bainite large-section plastic mould steel is the granular bainite tissue, and its firmness level reaches HRC28～33.This is a kind of non-quenching and tempering plastic mold steel, but its hardness requires difference, and the composition design is different.
External typical alloy plastic die steel all adopts modified pre-hardening art breading, and principal feature is as follows:
| The trade mark | C％ | Mn％ | Si％ | Cr％ | Mo％ | Ni％ | Hardness HRC |
| P20 | 0.28-0.40 | 0.60-1.00 | 0.20-0.80 | 1.40-2.0 | 0.30-0.55 | 0.10-0.30 | 28-33 |
| 718 | 0.28-0.40 | 1.00-1.50 | 0.20-0.80 | 1.40-2.00 | 0.30-0.55 | 0.80-1.20 | 33-38 |
Above-mentioned materials all is the die cavity that is used for mould of plastics, and never has new kind for the non-hardened and tempered steel material of high-grade mould of plastics mould bases.
In view of above-mentioned, the inventor is through repeatedly, after repeatedly the research, test, find: by the composition design of uniqueness, be configured to corresponding stress relief annealing technology,, take this through pre-hardening, the desired hardness of die steel material can be guaranteed, simultaneously, hardening and tempering process can be removed from again, the user can direct saw cutting use, thus, can be simultaneously for both sides of supply and demand are that the acquisition of the non-hardened and tempered steel material of high-grade mould of plastics mould bases reduces production costs, enhance productivity, thus, finished the present invention.
Summary of the invention
The objective of the invention is to: a kind of prevulcanized low-alloy non-hardened and tempered steel of process that is used for high-grade frame steel of plastic mould is provided, above-mentioned low-alloy non-hardened and tempered steel has unique composition design, both guaranteed the hardness of die steel material requirement, can guarantee the desired hardness of die steel material, simultaneously, can remove hardening and tempering process from again, the user can direct saw cutting use, thus, can be simultaneously for both sides of supply and demand are that the acquisition of the non-hardened and tempered steel material of high-grade mould of plastics mould bases reduces production costs, enhance productivity.
Purpose of the present invention is again: a kind of manufacture method that is used for the prevulcanized low-alloy non-hardened and tempered steel of process of high-grade frame steel of plastic mould is provided, the manufacture method of above-mentioned low-alloy non-hardened and tempered steel is by unique composition design, be configured to corresponding stress relief annealing technology, through pre-hardening, both guaranteed the hardness of die steel material requirement, the desired hardness of die steel material can be guaranteed, simultaneously, hardening and tempering process can be removed from again.
Thus, obtain a kind of high-grade mould bases steel through there being higher hardness to require after the pre-hardening, the user can direct saw cutting use.Need not modifier treatment, the user can direct saw cutting use, and not only saves the energy, reduces environmental pollution, and has improved production efficiency, reduces production costs, and enhances productivity.
The chemical ingredients of the low-alloy non-hardened and tempered steel novel material that is used for high-grade frame steel of plastic mould of the present invention is as follows:
(mass percent, %)
C：0.30-0.40
Si：0.20-0.70
Mn：1.00-1.50
P：≤0.030
S：≤0.025
Cr：1.00-1.50
Mo：0.10-0.30
Ni：0.10-0.30
Ti：0.010-0.030
About the finished product hardness 24-29HRC of the low-alloy non-hardened and tempered steel that is used for frame steel of plastic mould of the present invention (pre-hardening).
The manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention comprises following operation:
Converter smelting is handled through external refining and vacuum outgas, and molten steel adopts the killed ingot cast, and by hot ingot mode shove charge soaking, blooming mill is rolling becomes a useful person, and takes stress relief annealing (non-modified) technology after rolling, and eliminates the internal stress of steel billet, the steel billet cutting.
The chemical ingredients of the low-alloy non-hardened and tempered steel novel material that is used for frame steel of plastic mould of the present invention is as follows:
C：0.30-0.40
Si：0.20-0.70
Mn：1.00-1.50
P：≤0.030
S：≤0.025
Cr：1.00-1.50
Mo：0.10-0.30
Ni：0.10-0.30
Ti：0.010-0.030
According to composition principle of design of the present invention, requiring to roll back air cooling tissue is bainite, and hardness is uniform and stable.Therefore, select the base material of Cr-Mo steel for use as novel material.The Cr-Mo steel is in the material that contains Cr amount 1%, adds the Mo of 0.15-0.30%.The steel alloy sclerosis that contains Cr, Mo can be big, and the high temperature resistance softening performance is good, is difficult for producing temper brittleness, adds other a small amount of alloy strengthening element again, with hardness and the stability that reaches material requirements.
Alloying element commonly used in the steel alloy is a lot, and is big or small according to itself and carbon bonded tendency, can divide non-carbide forming element and carbide forming element.
Non-carbide forming element: Ni, Co, Cu, Si, Al, N, B etc.These elements and carbon avidity are very weak, and the discord carbonization is closed in steel, forms the alloy ferrite in the ferrite but dissolve in, and matrix is played the solution strengthening effect.
Middle strong carbide forming element: Mn, Cr, Mo, W etc.Generally can replace the iron atom in the cementite and form alloyed cementite, as (Fe, Mn) 3C, (Fe, Cr) 3C, (Fe, W) 3C etc., alloyed cementite still has the complicated hexagonal lattice of cementite.Cementite is the minimum carbide of a kind of stability because the avidity of Fe and C a little less than.Alloyed cementite slightly improves than cementite stability, and hardness is also higher, is the main carbide that exists in the general low alloy steel.
Strong carbide forming element: Mo, W, Ti, Zr, Nb, V.During these alloying element contents higher (ω Me＞5%), just tend to form alloy carbide, as Cr7C3, Cr23C5, Fe3W3 etc.It has higher fusing point, hardness, wear resistance than alloyed cementite, and more stable.
The main component of base material is 0.35%C, 0.60%Mn, 0.25%Si, 1.00%Cr, 0.20%Mo.Press non-tempering process production, the material actual hardness has only 20～24HRC, does not reach the requirement of 24～29HRC.In order to improve material hardness, on the basis of CrMo steel, further add alloying element Mn, Ni, Cr, Ti, material is played strengthening effect.
Mn: manganese has significant effect to the intensity that improves low-carbon (LC) and middle carbon perlitic steel, adds more manganese here to strengthen the intensity and the hardness of steel, and ferromanganese also is a kind of cheaper alloy.When the content of manganese surpasses 1.5%, the toughness of steel and welding property are degenerated.Therefore, Mn content is controlled between 1.0～1.5%.
Si: silicon is very big to the effect that improves hardness, but the silicone content height, can cause the heat conductivility variation of material, and the toughness of material also sharply descends, to work-ing life of mould be disadvantageous.General Si content is controlled at 0.20～0.70%.
Cr: chromium can improve the intensity and the hardness of steel.Form carbide, strengthen Hardening Of Steel energy and high temperature resistance softening performance, improve wear resisting property.The add-on of chromium is mainly considered the hardness that need reach, and it is 1.00～1.50% more suitable that test shows that Cr is controlled at.Cr content is too low, and hardness does not reach, and Cr content is too high, and steel billet is prone to surface crack.
Mo: molybdenum has the solution strengthening effect to ferrite.Improve the heat resistance of steel, improve the hardening capacity of steel, improve the intensity and the hardness of steel, eliminate quenching property of tempering.But the cost of considering ferro-molybdenum is too high, and Mo content generally is controlled at 0.10～0.30% just can play effect.
Ni: nickel is a kind of solution strengthening element, can improve the intensity of steel and does not significantly reduce its toughness.The Ni here is the special element that adds.Can significantly improve the homogeneity and the stability of steel hardness, improve the processibility and the weldability of steel.
A spot of nickel just can play effective function, and through overtesting, as long as the addition of nickel is 0.10～0.30% just passable.
Ti: crystal grain thinning forms carbide TiC, precipitation strength with carbon.Titanium can improve the heat resistance of steel, improves the hot strength of steel; Embrittlement phenomenon when preventing high temperature cooling.Add Ti, play the grain fineness number of organizing of refinement steel.Generally be no more than 0.030%.
Thus, obtain the chemical ingredients of above-mentioned novel material.
The design hardness of the low-alloy non-hardened and tempered steel of the manufacture method manufacturing of the low-alloy non-hardened and tempered steel that is used for frame steel of plastic mould of the present invention is 24～29HRC, is suitable for steel plate thickness :≤200mm.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, described converter tapping ladle target temperature is 1580-1620 ℃.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, in described the bessemerizing, blow off carbon 〉=0.04% prevents the peroxidation of blowing.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention,, finish alloying, intensification, deoxidation task by the LF external refining.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, the RH vacuum outgas, RH treatment time 〉=24 minute guarantee that hydrogen richness is less than 2ppm.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, RH finishes 1550 ± 5 ℃ of ladle temperature.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, molten steel adopts steel ingot to pour into a mould by the mode of making a bet, casting whole process using argon for protecting pouring.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, the equal heat pattern of steel ingot is: be incubated 60 minutes early stage, is warming up to 1000 ℃ with 50 ℃/hr then, is incubated 300 minutes, be warming up to 1290 ℃ with 150 ℃/hr again, soaking 420 minutes.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention, slab rolls the back air cooling to room temperature.
According to the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention,
Described slab stress relief annealing technology is
| Be suitable for specification mm | Loaded condition | Starting temperature ℃ | Heat-up rate ℃/h | Holding temperature ℃ | Soaking time h | Cooling rate ℃/h | Tapping temperature ℃ |
| Thickness 60～200 | Normal temperature | 150±20 | 90±10 | 450±10 | 12 | Stove is cold | 350±20 |
Embodiment
Below, with embodiment, specify the present invention.
Embodiment 1
Make the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould of the present invention.Comprise following operation:
Converter smelting is handled through external refining and vacuum outgas, and molten steel adopts the killed ingot cast, and by hot ingot mode shove charge soaking, blooming mill is rolling becomes a useful person, and takes stress relief annealing (non-modified) technology after rolling, and eliminates the internal stress of steel billet, the steel billet cutting.
The low-alloy non-hardened and tempered steel chemical composition design that is used for frame steel of plastic mould of the present invention is as shown in table 1 below:
Table 1 (mass percent, %)
| C | Mn | Si | Cr | Mo | Ni | Ti | S | P |
| 0.30～ 0.40 | 1.00～ 1.50 | 0.20～ 0.70 | 1.00～ 1.50 | 0.10～ 0.30 | 0.10～ 0.30 | 0.010～ 0.030 | ≤ 0.025 | ≤ 0.030 |
Converter smelting process:
1580 ℃ of converter tapping ladle target temperatures; Blow off carbon 〉=0.04% prevents the peroxidation of blowing;
The pushing off the slag tapping prevents down the slag rephosphorization.
The LF external refining:
Finish alloying, intensification, deoxidation task.
The RH vacuum outgas:
RH treatment time 〉=24 minute guarantee that hydrogen richness is less than 2ppm; RH finishes 1550 ± 5 ℃ of ladle temperature.
Pouring molten steel:
Adopt steel ingot to pour into a mould, casting whole process using argon for protecting pouring by the mode of making a bet;
Behind the ingot steel casting, the calm 120 minutes time, 400 minutes beginning demould times, soaking pit is sent in steel ingot demoulding after heat.The equal thermal process of steel ingot:
Be incubated 60 minutes early stage, is warming up to 1000 ℃ with 50 ℃/hr then, is incubated 300 minutes, is warming up to 1290 ℃ with 150 ℃/hr again, soaking 420 minutes.
Blooming mill is rolling:
The soaking of slab steel ingot is after blooming mill is rolled into slab, and the crop rate is not less than 10%, and the back-end crop rate is not less than 2%;
Slab rolls the back air cooling to room temperature, forbids cooling in heap, slow cooling.
Slab stress relief annealing technology: see Table 2
Table 2 slab stress relief annealing technology
| Be suitable for specification mm | Loaded condition | Starting temperature ℃ | Heat-up rate ℃/h | Holding temperature ℃ | Soaking time h | Cooling rate ℃/h | Tapping temperature ℃ |
| Thickness 60～200 | Normal temperature | 150±20 | 90±10 | 450±10 | 12 | Stove is cold | 350±20 |
Flame cleaning is forbidden in slab annealing rear surface, adopts the sawing mode to cut.
According to the method described above, make the 11 stove steel that are used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould as of the present invention, its every index sees Table 3.
Table 3
The uniformity index of hardness sees Table 4.
Table 4
| Average | Standard deviation | Minimum value | Maximum value |
| 27.2 | 1.7 | 23 | 30 |
As seen by above-mentioned, the low-alloy non-hardened and tempered steel material hardness that is used for frame steel of plastic mould of the present invention is evenly better, and mean value is 27.2HRC, standard deviation 1.7HRC.
According to prevulcanized low-alloy non-hardened and tempered steel of process and the manufacture method thereof that is used for frame steel of plastic mould of the present invention, described low-alloy non-hardened and tempered steel has unique composition design, both guaranteed the hardness of die steel material requirement, the desired hardness of die steel material can be guaranteed, simultaneously, hardening and tempering process can be removed from again, the user can direct saw cutting use, thus, can be simultaneously for both sides of supply and demand are that the acquisition of the non-hardened and tempered steel material of high-grade mould of plastics mould bases reduces production costs, enhance productivity.
Claims (8)
1. a low-alloy non-hardened and tempered steel that is used for frame steel of plastic mould is characterized in that, (quality %) is as follows for the chemical ingredients of low-alloy non-hardened and tempered steel:
C：0.30-0.40
Si：0.20-0.70
Mn：1.00-1.50
P：≤0.030
S：≤0.025
Cr：1.00-1.50
Mo：0.10-0.30
Ni：0.10-0.30
Ti：0.010-0.030。
2. the low-alloy non-hardened and tempered steel that is used for frame steel of plastic mould as claimed in claim 1 is characterized in that, the finished product pre-hardening hardness of described low-alloy non-hardened and tempered steel is 24-29HRC.
3. manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould, the chemical ingredients of described low-alloy non-hardened and tempered steel novel material is as follows:
C：0.30-0.40
Si：0.20-0.70
Mn：1.00-1.50
P：≤0.030
S：≤0.025
Cr：1.00-1.50
Mo：0.10-0.30
Ni：0.10-0.30
Ti：0.010-0.030，
The method of described low-alloy non-hardened and tempered steel comprises following operation:
Converter smelting is handled through external refining and vacuum outgas, and molten steel adopts the killed ingot cast, and by hot ingot mode shove charge soaking, blooming mill is rolling becomes a useful person, and takes the non-tempering process of stress relief annealing after rolling, and eliminates the internal stress of steel billet, the steel billet cutting.
4. the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould as claimed in claim 3 is characterized in that the design hardness of described low-alloy non-hardened and tempered steel is 24～29HRC, is suitable for steel plate thickness :≤200mm.
5. the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould as claimed in claim 3 is characterized in that, described converter tapping ladle target temperature is 1580-1620 ℃,
In described bessemerizing, blow off carbon 〉=0.04% prevents the peroxidation of blowing,
In described LF external refining, finish alloying, intensification, deoxidation task,
In described RH vacuum outgas, RH treatment time 〉=24 minute guarantee hydrogen richness less than 2ppm,
Described RH finishes 1550 ± 5 ℃ of ladle temperature,
Described molten steel adopts steel ingot to pour into a mould by the mode of making a bet, casting whole process using argon for protecting pouring.
6. the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould as claimed in claim 3, it is characterized in that, the equal heat pattern of described steel ingot is: be incubated 60 minutes early stage, be warming up to 1000 ℃ with 50 ℃/hr then, be incubated 300 minutes, be warming up to 1290 ℃ with 150 ℃/hr again, soaking 420 minutes.
7. the manufacture method that is used for the low-alloy non-hardened and tempered steel of frame steel of plastic mould as claimed in claim 3 is characterized in that, described slab rolls the back air cooling to room temperature.
8. the manufacture method that is used for the low-alloy non-hardened and tempered steel of high-grade frame steel of plastic mould as claimed in claim 3 is characterized in that, described slab stress relief annealing technology is:
Be suitable for steel plate thickness: 60～200mm, loaded condition: normal temperature, starting temperature ℃: 150 ± 20, holding temperature ℃: 450 ± 10, soaking time h:12, cooling rate ℃/h: stove is cold, tapping temperature ℃: 350 ± 20.
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| CN102051448A (en) * | 2011-01-14 | 2011-05-11 | 山西太钢不锈钢股份有限公司 | Method for low temperature tempering of die flat steel |
| CN102198504A (en) * | 2011-06-27 | 2011-09-28 | 南京钢铁股份有限公司 | Production technology of mirror-surface plastic die steel |
| CN102286698A (en) * | 2010-06-17 | 2011-12-21 | 宝山钢铁股份有限公司 | Plastic mold steel and manufacture method thereof |
| CN102943216A (en) * | 2012-10-23 | 2013-02-27 | 安徽荣达阀门有限公司 | Mold steel used for hot-forging mold-pressing casting mold |
| CN104988434A (en) * | 2015-07-04 | 2015-10-21 | 江阴兴澄特种钢铁有限公司 | Thick sulfur-containing plastic mould steel plate and production process thereof |
| CN105274448A (en) * | 2015-10-08 | 2016-01-27 | 如皋市宏茂重型锻压有限公司 | Highly polished pre-hardening plastic die steel and manufacturing process thereof |
| CN105803299A (en) * | 2016-05-30 | 2016-07-27 | 舞阳钢铁有限责任公司 | Production method of extra-thick high-purify plastic mold steel plate |
| CN105925889A (en) * | 2016-06-30 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Ultrathick specification 1.2311 mold steel plate and preparation method thereof |
| CN107931992A (en) * | 2017-11-27 | 2018-04-20 | 盐城耀强模塑科技有限公司 | A kind of processing technology of thermoprinting die |
| CN109252085A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | A kind of production method of pre-hardening steel plate for plastic mould |
| CN116770169A (en) * | 2023-05-15 | 2023-09-19 | 江阴兴澄特种钢铁有限公司 | 201-300mm thick free-cutting pre-hardening die steel plate and manufacturing method thereof |
-
2007
- 2007-01-22 CN CNA2007100367114A patent/CN101230442A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102286698A (en) * | 2010-06-17 | 2011-12-21 | 宝山钢铁股份有限公司 | Plastic mold steel and manufacture method thereof |
| CN102051448A (en) * | 2011-01-14 | 2011-05-11 | 山西太钢不锈钢股份有限公司 | Method for low temperature tempering of die flat steel |
| CN102051448B (en) * | 2011-01-14 | 2012-10-03 | 山西太钢不锈钢股份有限公司 | Method for low temperature tempering of die flat steel |
| CN102198504A (en) * | 2011-06-27 | 2011-09-28 | 南京钢铁股份有限公司 | Production technology of mirror-surface plastic die steel |
| CN102943216A (en) * | 2012-10-23 | 2013-02-27 | 安徽荣达阀门有限公司 | Mold steel used for hot-forging mold-pressing casting mold |
| CN104988434A (en) * | 2015-07-04 | 2015-10-21 | 江阴兴澄特种钢铁有限公司 | Thick sulfur-containing plastic mould steel plate and production process thereof |
| CN105274448A (en) * | 2015-10-08 | 2016-01-27 | 如皋市宏茂重型锻压有限公司 | Highly polished pre-hardening plastic die steel and manufacturing process thereof |
| CN105803299A (en) * | 2016-05-30 | 2016-07-27 | 舞阳钢铁有限责任公司 | Production method of extra-thick high-purify plastic mold steel plate |
| CN105803299B (en) * | 2016-05-30 | 2017-09-19 | 舞阳钢铁有限责任公司 | A kind of production method of special thick high cleanliness plastic steel plate for die |
| CN105925889A (en) * | 2016-06-30 | 2016-09-07 | 江阴兴澄特种钢铁有限公司 | Ultrathick specification 1.2311 mold steel plate and preparation method thereof |
| CN109252085A (en) * | 2017-07-13 | 2019-01-22 | 鞍钢股份有限公司 | A kind of production method of pre-hardening steel plate for plastic mould |
| CN107931992A (en) * | 2017-11-27 | 2018-04-20 | 盐城耀强模塑科技有限公司 | A kind of processing technology of thermoprinting die |
| CN116770169A (en) * | 2023-05-15 | 2023-09-19 | 江阴兴澄特种钢铁有限公司 | 201-300mm thick free-cutting pre-hardening die steel plate and manufacturing method thereof |
| CN116770169B (en) * | 2023-05-15 | 2024-05-17 | 江阴兴澄特种钢铁有限公司 | 201-300Mm thick free-cutting pre-hardening die steel plate and manufacturing method thereof |
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