CN102094154B - Homogeneous module material and metallurgical manufacturing method thereof - Google Patents
Homogeneous module material and metallurgical manufacturing method thereof Download PDFInfo
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- CN102094154B CN102094154B CN2009102010416A CN200910201041A CN102094154B CN 102094154 B CN102094154 B CN 102094154B CN 2009102010416 A CN2009102010416 A CN 2009102010416A CN 200910201041 A CN200910201041 A CN 200910201041A CN 102094154 B CN102094154 B CN 102094154B
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Abstract
The invention provides a homogeneous module material comprising the following chemical components by mass percent: 0.24-0.30 percent of C, 0.20-0.23 percent of Si, 1.40-1.50 percent of Mn, 1.20-1.50 percent of Cr, 0.08-0.15 percent of V, 0.90-1.20 percent of Ni, 0.40-0.50 percent of Mo, 0.020-0.030 percent of Al, 0.27-0.35 percent of Cu, not more than 0.015 percent of S, not more than 0.020 percent of P, and the balance of Fe. The invention also provides a metallurgical manufacturing method of the homogeneous module material. The metallurgical manufacturing method is used for improving the technological parameters of a module forging process and a pre-hardening heat treatment process and improving the high-quality homogeneous module material by adopting 20-30 tons of large-size steel ingots.
Description
Technical field
The present invention relates to a kind of die steel module material, be specifically related to a kind of mould of plastics manufacturing with large-scale homogeneous module material and metallurgical manufacturing method thereof.
Background technology
Die steel module divides according to purposes generally can be divided into hot-die module and mold module; Wherein the homogeneous module belongs to the category of mold module; Its uniform tissue and less cross section difference of hardness make this homogeneous module in mold module, be in higher quality quality position, and product specification is higher.These two kinds of die steel modules have different purposes, and the hot-die module is to be used to make the metal forming mould, and mold module is to be used to make mould for plastics, and mold module is that current die industry uses maximum a kind of metallurgic products.The mold module that China uses at present is the 3Cr2MnNiMo made that adopts among standard GB/T1299-2002, and the performance index of the proportioning of the Chemical Composition that its method of manufacture is involved, ME and metallurgic product are following:
The proportioning of Chemical Composition:
C：0.32-0.40wt％，Si：0.20-0.40wt％、Mn：1.10-1.50wt％、Cr：1.70-2.00wt％、Mo：0.25-0.40wt％、Ni：0.85-1.15wt％、S≤0.03wt％、P≤0.03wt％；
ME:
Process step is followed successively by and is: electric-arc furnace steelmaking-be cast into steel ingot-forge into module-pre-hardening thermal treatment-formation metallurgic product.Wherein: electric arc furnace is cast into 10-20 ton steel ingot after accomplishing steel-making; Heat treatment requirements carries out in large-scale quenching tank, and this process is that the mold module with forging and molding is heated to 840-880 ℃ of insulation and shifts out process furnace after 3-4 hour and put into quenching tank and cool off the back tempering in heat treatment heating furnace.
There is following problem in original technology: 1) because the quenching bainite content of material is merely 70%; Therefore the ingot shape of casting is little after the electric-arc furnace steelmaking; Be merely the 10-20 ton, make the single-piece weight of module product be no more than 17 tons, can not satisfy the manufacturing that surpasses 17 ton large-scale mold modules.2) module is big through the cross section hardness difference after modified, up to Δ HRC3.0, can not satisfy the requirement of die industry to high quality homogeneous module, and these performance index are important performance indexes that die industry is weighed mold module quality height.
Summary of the invention
For solving above technical problem, the object of the present invention is to provide the homogeneous module material of new chemical ingredients proportioning.Another object of the present invention provides that a kind of material quenching bainite content is high, the homogeneity of the module cross section quenching and tempering hardness metallurgical manufacturing method of high quality homogeneous module material preferably.
Homogeneous module material provided by the invention, the mass percent of its chemical ingredients is: C:0.24-0.30, Si:0.20-0.23, Mn:1.40-1.50; Cr:1.20-1.50, V:0.08-0.15, Ni:0.90-1.20; Mo:0.40-0.50, Al:0.020-0.030, Cu:0.27-0.35; S≤0.015, P≤0.020, all the other are Fe.
Below be the effect and the qualification explanation thereof of various elements in the homogeneous module material of the present invention:
C：0.24-0.30wt％
Carbon is the fundamental element that forms various carbide and matrix; Also be to influence mold module; The important element of large-scale mold module composition segregation particularly; The carbon content of the 3Cr2MnNiMo steel that the design of carbon content is more original has descended many, mainly is the composition segregation that reduces large-scale mold module, thereby reduces the hardness difference of mold module.In addition; Having reduced carbon element content to the scope of 0.24-0.30wt% can be so that mold module compound F 17-hydroxy-corticosterone e7Mo6 between the low temperature precipitating metal; And can take place ε mutually with the eutectoid of M6C carbide, increase the intensity of module matrix, thereby make the tensile strength and the ys raising of module.
Si：0.20-0.23wt％
Element silicon is not a carbide forming element; Though element silicon has the effect of solution strengthening; But element silicon can change module when the pre-hardening tempering heat treatment carbide separate out quantity; Silicon content is higher than the upper limit of composition design, on certain degree, can restrain module carbide separating out in drawing process, is unfavorable for the raising of mold module intensity.Because the intensity of this mold module mainly is to rely on the carbide precipitation strength, therefore, the silicon content of the 3Cr2MnNiMo steel that the design of silicon content is more original has decline to a certain degree.
Mn：1.40-1.50wt％
Manganese element is not a carbide forming element; Manganese element can the refine pearlite tissue; And manganese element can significantly improve the hardening capacity of module, and particularly for large-scale mold module, raising manganese element content seems and is even more important; The more original 3Cr2MnNiMo height of the design of manganese element has that to increase its purpose also be the hardening capacity that increases mold module, makes that the hardness difference after the thermal treatment of heavy die block reduces.
Cr：1.20-1.50wt％
The chromium element is a carbide forming element, and in alloying element, the bonding force that chromium element and carbon form carbide is the strongest, and the chromium element not only can form carbide, but also can change the microstructure situation of steel and the hardening capacity in the heat treatment process.The chromium constituent content surpasses the formation that the design upper limit is unfavorable for the lath-shaped bainite.If the content of chromium element is lower than the design lower limit, this will cause the hardening capacity of mold module to descend, and the general who has surrendered directly has influence on the stability and the homogeneity of the pre-hardening hardness of large-scale mold module under the hardening capacity.
V：0.08-0.15wt％
V element is the strong carbide forming element, and adding a spot of v element among the design both can thinning microstructure, can increase the hardening capacity of steel again.In the heat-treatment quenching process; The adding of a small amount of v element can be restrained austenite crystal in the austenite insulating process tendency of growing up; Refine austenite crystal grain; In the tempering heat treatment process, can combine to form VC, M2C type carbide with carbon, this VC, M2C type carbide present the state that disperse is separated out in mold module tempering heat treatment process, make the anti-temper resistance of mold module improve; The raising of hardening capacity simultaneously makes that the uniformity of hardness of heavy die block is more abundant, and is highly beneficial to the decline of the hardness difference of heavy die block.Therefore more original 3Cr2MnNiMo steel has increased a spot of v element among the design, and good effect has been played in the lifting of the performance of mold module.
Mo：0.40-0.50wt％
Molybdenum element is that the strong carbide that is only second to v element forms alloying element; Mainly be can be so that mold module obtains better hardening capacity and uniformity of hardness; Because molybdenum element can form M2C and M3C type carbide with carbon; The effect of twice reinforcement is arranged, and molybdenum element can increase the hardening capacity of steel again, obtains bainite structure.For large-scale mold module, increase hardening capacity means can obtain hardness more uniformly in the drawing process of steel, thereby makes the pre-hardening hardness difference of large-scale mold module reduce, and improves the performance number of mold module.
Ni：0.90-1.20wt％
Nickel element is non-carbide forming element; The adding of nickel element can be so that the austenite of module be more stable; Increased the hardening capacity of heavy die block thereby make perlitic transformation point when cooling transformation move right, the adding of nickel element makes large-scale mold module in process of cooling, obtain uniform martensitic stucture, is decomposed into sorbite during tempering; Guarantee the uniformity of hardness of module, reduced the hardness difference of large-scale mold module.
Al：0.02-0.04wt％、
In homogeneous module material of the present invention, adding the aluminium element effect mainly is in steel, to form the Solder for Al-Cu Joint Welding metallographic phase; Improve the content of bainite after quench treatment in the steel; Make the module tissue homogenize; And the effect of crystal grain thinning is arranged to a certain extent, make the even hardness degree of the module effect that is greatly improved.
Cu：0.27-0.35wt％
In homogeneous module material of the present invention, adding the copper effect mainly is in steel, to form the Solder for Al-Cu Joint Welding metallographic phase, improves the content of bainite after quench treatment in the steel, makes the even hardness degree of the module effect that gets a promotion.It is excessive that copper can not add, and surpasses the fragility that the upper limit may cause material.
S≤0.015wt％
As far as most of steel alloys, element sulphur is a harmful element, and particularly to large-scale mold module, element sulphur causes the deterioration of the processing characteristics of steel easily on certain degree, makes steel in hot worked process, produce overheated and burn-off phenomenon easily.Some of control sulphur content can improve steel processing characteristics and mechanical property.
P≤0.020wt％
The control of phosphoric among the design is low, performances such as the toughness that can improve steel and homogeneity segregation, the workability of lifting large-scale mold module.
The present invention also provides a kind of metallurgical manufacturing method of above-mentioned homogeneous module material, comprises electric-arc furnace steelmaking, the steel ingot casting, and module is forged and the pre-hardening heat treatment step, it is characterized in that:
In said module forging process, steel ingot insulation 5-8 hour behind forge furnace internal heating to 1180 ℃-1220 ℃ is opened and is forged 1100 ℃-1180 ℃ of temperature, stops forging 900 ℃-1000 ℃ of temperature;
In said pre-hardening heat treatment step, at first mold module is heated to 840 ℃-880 ℃ after insulation after 6-8 hour, in hardening liquid, be cooled to room temperature, again with mold module 550 ℃-580 ℃ down insulations 10-12 hour, air cooling is to room temperature then.
Metallurgical manufacturing method according to homogeneous module material of the present invention is preferably, and said steel ingot is 20 tons-35 tons.
Metallurgical manufacturing method according to homogeneous module material of the present invention is preferably, and the heat temperature raising speed in the said forge furnace is 80 ℃/h-120 ℃/h.
According to the metallurgical manufacturing method of homogeneous module material of the present invention, in a preferred embodiment, be heated to 840 ℃-880 ℃ in the said pre-hardening heat treatment step and in quenching furnance, carry out; Insulation is carried out in tempering stove under said 550 ℃-580 ℃.
The know-why of method of manufacture of the present invention is: outer concise 20 tons-35 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove: the market requirement that can satisfy maximum 24 tons of mold module single-piece weight on the one hand; Large steel ingot can obtain bigger forging compression ratio than little steel ingot on the other hand; Can improve the segregation of the Chemical Composition of mold module like this, improve the homogeneity of structure of module.
Steel ingot insulation behind forge furnace internal heating to 1180 ℃-1220 ℃ can obtain best thermal distortion plasticity in 5-8 hour, helped forgedly carrying out smoothly.Open and forge 1100 ℃-1180 ℃ of temperature; Stop forging 900 ℃-1000 ℃ of temperature: forge temperature and stop forging the austenite region that the temperature controlling scope is a mold module owing to open, have good high-temperature ductility and deformability, can not cause the mold module cracking phenomena that in deformation process, deforms.
Mold module is inserted in the quenching furnance according to insulation after being heated to 840 ℃-880 ℃ 6-8 hour, can obtain a kind of austenite structure.Shift out quenching furnance and in hardening liquid, be cooled to room temperature, this type of cooling can be so that the homogeneous module obtains uniform bainite structure, makes the even hardnessization of module.
It is that insulation is come out of the stove after 10-12 hour and naturally cooled to room temperature in the air in 550 ℃-580 ℃ the tempering stove that mold module is inserted furnace temperature: this processing mode is to obtain the tempered sorbite tissue for mold module; Make the even hardnessization of module, and reach rational hardness requirement.
In the prior art with chemical ingredients proportioning of the present invention more approaching be Chinese patent 200510025142.4.These patent 200510025142.4 related modules are the stainless series modules of high Cr, apply to anti-corrosion module field, and are different with module purposes of the present invention.The present invention compares with this patent; Added a spot of V element; Mainly be the multiple alloying element compound action of low-alloy, particularly add aluminium and copper and form metallographic phase raising quenching bainite content, reach the homogenizing effect of module; Control to the content of P and S is tight than patent 200510025142.4, and the clarity of steel wants high relatively.
The present invention has following advantage compared with prior art:
1. the proportioning of Chemical Composition is more reasonable, makes module in the quench treatment process, obtain more bainite structure, and the compound action of alloying has improved the stability of hardening capacity and bainite structure; The Solder for Al-Cu Joint Welding metallographic phase improves the content of bainite after quench treatment in the steel, makes that the cross section hardness difference after the thermal treatment of homogeneous module reduces, and is highly beneficial to the decline of the hardness difference of heavy die block.The content that reduces p and s can be so that molten steel be purer, and the non-metallic inclusion that reduces steel forms trend, reduces the modified temper brittleness of steel, improves the performance of steel.
2. the teeming weight in the manufacturing processed is increased to the 20-35 ton from original 10-20 ton; Make the single-piece weight of mold module bring up to 24 tons of maximum single-piece weight from 17 tons of original maximum weights; Satisfied the demand of mould market, improved the product competitiveness and the possession share in market large-scale homogeneous module.
3. the rational chemical design makes the performance index of large-scale mold module obviously improve with advanced ME.Quenching bainite content is brought up to more than 95% from original 70%; Cross section hardness difference is reduced to Δ HRC below 1.5 from Δ HRC 3.
Description of drawings
Fig. 1 is the homogeneous module surface micro-organization chart of the embodiment of the invention 1.
Fig. 2 is the homogeneous module 1/2 radius micro-organization chart of the embodiment of the invention 1.
Fig. 3 is the place micro-organization chart of homogeneous module heart portion of the embodiment of the invention 1.
Embodiment
Embodiment 1
The weight percent of the Chemical Composition of steel is: C:0.25wt%, Si:0.22wt%, Mn:1.41wt%, Cr:1.33wt%, V:0.11wt%, Ni:0.97wt%, Mo:0.43wt%, Al:0.028wt%, Cu:0.29wt%, S:0.011wt%, P:0.013wt%, all the other are Fe.
The outer concise 25 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1195 ℃ of steel ingot Heating temperatures, soaking time 5.5 hours, steel ingot forges to open forges 1120 ℃ of temperature; Stop forging 960 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 860 ℃ in the quenching furnance after the insulation 6.7 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 10 hours and naturally cooled to room temperature in the air in 570 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98%; Cross section hardness difference DELTA HRC1.30.
Embodiment 2
The weight percent of the Chemical Composition of steel is: C:0.25wt%, Si:0.21wt%, Mn:1.43wt%, Cr:1.29wt%, V:0.08wt%, Ni:0.99wt%, Mo:0.48wt%, Al:0.020wt%, Cu:0.28wt%, S:0.009wt%, P:0.020wt%, all the other are Fe.
The outer concise 25 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1180 ℃ of steel ingot Heating temperatures, soaking time 5 hours, steel ingot forges to open forges 1100 ℃ of temperature; Stop forging 900 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 850 ℃ in the quenching furnance after the insulation 8 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 11 hours and naturally cooled to room temperature in the air in 560 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98%; Cross section hardness difference DELTA HRC 1.26.
Embodiment 3
C:0.28wt%, Si:0.20wt%, Mn:1.50wt%, Cr:1.20wt%, V:0.15wt%, Ni:1.19wt%, Mo:0.40wt%, Al:0.025wt%, Cu:0.30wt%, S:0.003wt%, P:0.013wt%, all the other are Fe.
The outer concise 35 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1220 ℃ of steel ingot Heating temperatures, soaking time 8 hours, steel ingot forges to open forges 1150 ℃ of temperature; Stop forging 1000 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 880 ℃ in the quenching furnance after the insulation 6.5 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 10 hours and naturally cooled to room temperature in the air in 580 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98.5%; Cross section hardness difference DELTA HRC 1.43.
Embodiment 4
C:0.30wt%, Si:0.23wt%, Mn:1.40wt%, Cr:1.50wt%, V:0.11wt%, Ni:1.10wt%, Mo:0.50wt%, Al:0.030wt%, Cu:0.35wt%, S:0.011wt%, P:0.010wt%, all the other are Fe.
The outer concise 25 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1190 ℃ of steel ingot Heating temperatures, soaking time 6.5 hours, steel ingot forges to open forges 1175 ℃ of temperature; Stop forging 970 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 840 ℃ in the quenching furnance after the insulation 7 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 12 hours and naturally cooled to room temperature in the air in 550 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98.8%; Cross section hardness difference DELTA HRC 1.33.
Embodiment 5
C:0.26wt%, Si:0.23wt%, Mn:1.41wt%, Cr:1.33wt%, V:0.09wt%, Ni:0.90wt%, Mo:0.43wt%, Al:0.022wt%, Cu:0.33wt%, S:0.014wt%, P:0.011wt%, all the other are Fe.
The outer concise 25 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1210 ℃ of steel ingot Heating temperatures, soaking time 7 hours, steel ingot forges to open forges 1115 ℃ of temperature; Stop forging 920 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 840 ℃ in the quenching furnance after the insulation 6 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 11.5 hours and naturally cooled to room temperature in the air in 565 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98.1%; Cross section hardness difference DELTA HRC 1.40.
Embodiment 6
C:0.26wt%, Si:0.22wt%, Mn:1.47wt%, Cr:1.43wt%, V:0.09wt%, Ni:0.96wt%, Mo:0.45wt%, Al:0.026wt%, Cu:0.31wt%, S:0.011wt%, P:0.011wt%, all the other are Fe.
The outer concise 35 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1205 ℃ of steel ingot Heating temperatures, soaking time 7 hours, steel ingot forges to open forges 1135 ℃ of temperature; Stop forging 925 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 845 ℃ in the quenching furnance after the insulation 7.5 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 10.5 hours and naturally cooled to room temperature in the air in 570 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98.1%; Cross section hardness difference DELTA HRC 1.35.
Embodiment 7
C:0.29wt%, Si:0.21wt%, Mn:1.44wt%, Cr:1.39wt%, V:0.13wt%, Ni:1.08wt%, Mo:0.41wt%, Al:0.026wt%, Cu:0.33wt%, S:0.010wt%, P:0.018wt%, all the other are Fe.
The outer concise 25 ton large-scale steel ingots that are cast into afterwards of electric arc furnace refining just and stove; 1215 ℃ of steel ingot Heating temperatures, soaking time 7.5 hours, steel ingot forges to open forges 1160 ℃ of temperature; Stop forging 920 ℃ of temperature.
Carry out pre-hardening thermal treatment after forging finishes, at first with mold module insert be heated to 850 ℃ in the quenching furnance after the insulation 6 hours, shift out quenching furnance and in air, adopt hardening liquid to be cooled to room temperature.
It is that insulation is come out of the stove after 11.5 hours and naturally cooled to room temperature in the air in 565 ℃ the tempering stove that mold module is inserted furnace temperature.
Adopt the performance index of the homogeneous module of present embodiment obviously to improve, bainite content is 98.3%; Cross section hardness difference DELTA HRC1.38.
As can be seen from Figure 1, the quenching bainite structure in the microstructure of the module material that the embodiment of the invention 1 obtains has guaranteed the homogeneity of the surface hardness of homogeneous module after modified more than 99% content.All the other embodiment all produce same effect.
The microstructure metallograph can be found out from the embodiment of the invention 1 module of Fig. 2 surface, and the quenching bainite structure in its microstructure has guaranteed the homogeneity of the 1/2 radius hardness of homogeneous module after modified more than 98% content.All the other embodiment all produce same effect.
The embodiment of the invention 1 module of Fig. 3 surface microstructure metallograph demonstrates, and the quenching bainite structure in its microstructure has guaranteed the homogeneity of the module centers position hardness of homogeneous module after modified more than 96% content.All the other embodiment all produce same effect.
The present invention is through a kind of proportioning of new module material Chemical Composition and the metallurgical manufacturing method of this module material; Reach module material quenching bainite content surpass 95% and the cross section uniformity of hardness of module less than 1.5HRC; Thereby obtain a kind of high-quality homogeneous module, promote enterprise production homogeneous module product technology competition ability.
Claims (5)
1. a homogeneous module material is characterized in that, the mass percent of its chemical ingredients is: C:0.24-0.30, Si:0.20-0.23; Mn:1.40-1.50, Cr:1.20-1.50, V:0.08-0.15, Ni:0.90-1.20; Mo:0.40-0.50, Al:0.020-0.030, Cu:0.27-0.35; S≤0.015, P≤0.020, all the other are Fe.
2. the metallurgical manufacturing method of homogeneous module material according to claim 1 comprises electric-arc furnace steelmaking, the steel ingot casting, and module is forged and the pre-hardening heat treatment step, it is characterized in that:
In said module forging process, steel ingot insulation 5-8 hour behind forge furnace internal heating to 1180 ℃-1220 ℃ is opened and is forged 1100 ℃-1180 ℃ of temperature, stops forging 900 ℃-1000 ℃ of temperature;
In said pre-hardening heat treatment step, at first the homogeneous module is heated to 840 ℃-880 ℃ after insulation after 6-8 hour, in hardening liquid, be cooled to room temperature, again with the homogeneous module 550 ℃-580 ℃ down insulations 10-12 hour, air cooling is to room temperature then.
3. the metallurgical manufacturing method of homogeneous module material according to claim 2 is characterized in that, said steel ingot is 20 tons-35 tons.
4. the metallurgical manufacturing method of homogeneous module material according to claim 2 is characterized in that, the heat temperature raising speed in the said forge furnace is 80 ℃/h-120 ℃/h.
5. the metallurgical manufacturing method of homogeneous module material according to claim 2 is characterized in that, is heated to 840 ℃-880 ℃ in the said pre-hardening heat treatment step and in quenching furnance, carries out; Insulation is carried out in tempering stove under said 550 ℃-580 ℃.
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| CN103774059B (en) * | 2014-01-13 | 2016-05-04 | 胡财基 | A kind of pre-hardening type plastic mould steel |
| CN107177796B (en) * | 2017-04-24 | 2019-10-11 | 江阴兴澄特种钢铁有限公司 | 100-260mm thickness quenched and tempered state pre-hardening plastic steel plate for die and its manufacturing method |
| CN110317997A (en) * | 2018-03-29 | 2019-10-11 | 湖北长怡特钢贸易有限公司 | A kind of pre-hardening type 3Cr2MnNiMo plastic die steel |
| CN113182498A (en) * | 2021-01-29 | 2021-07-30 | 焦作市迈科冶金机械工程技术咨询有限公司 | Granular rail type iron alloy molten iron casting equipment and ingot mold thereof |
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| CN1264747A (en) * | 1999-12-29 | 2000-08-30 | 上海宝钢集团公司 | Frame steel of plastic mould and its manufacture method |
| CN101082110A (en) * | 2006-05-31 | 2007-12-05 | 宝山钢铁股份有限公司 | Long-life alloy die-casting module and manufacturing method thereof |
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| US5514227A (en) * | 1992-09-08 | 1996-05-07 | Bethlehem Steel Corporation | Method of preparing titanium-bearing low-cost structural steel |
| CN1264747A (en) * | 1999-12-29 | 2000-08-30 | 上海宝钢集团公司 | Frame steel of plastic mould and its manufacture method |
| CN101082110A (en) * | 2006-05-31 | 2007-12-05 | 宝山钢铁股份有限公司 | Long-life alloy die-casting module and manufacturing method thereof |
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