CN103276321B - Steel for anti-corrosive plastic die and production method for same - Google Patents
Steel for anti-corrosive plastic die and production method for same Download PDFInfo
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Abstract
The invention provides steel for an anti-corrosive plastic die and a production method for the same, aiming at producing polyvinyl chloride, fluorinated plastic or a flame-retardant plastic die added with a flame retardant, and meeting the requirements of the contact with a corrosive medium of the die during a pressing process. The steel for the anti-corrosive plastic die disclosed by the invention is characterized by comprising the following ingredients in percentage by mass: 0.05-0.18% of C, 0.8-1.26% of Mn, 0.13-0.30% of S, not greater than 0.04% of Si, not greater than 0.02% of P, 0.21-0.29% of Pb, 0.05-0.08% of Bi, 0.19-0.43% of W, 0.13-2.78% of Mo, 0.10-0.72% of Ti, 0.10-0.72% of Al, 0.3-0.8% of Ni, 0.05-0.12% of Nb, and the balance of Fe and inevitable impurities. The steel for the anti-corrosive plastic die disclosed by the invention is used for producing the anti-corrosive plastic die.
Description
technical field:
The present invention relates to a kind of die steel, be specifically related to a kind of Steel for anti-corrosive plastic die and production method thereof.
background technology:
Plastics are roughly divided into thermosetting resin and the large class of thermoplastics two, and every class is divided into again different kinds.Because the kind of molding plastic is different, and the different requirements of size, shape, precision, surfaceness etc. to plastics, there is different requirements to the wear resistance of Steel for Plastic Die, erosion resistance, thermotolerance, resistance to pressure, magnetic performance, Light deformation and mirror polish performance etc.General plastic die steel is for the production of the mould of general plastic (as polyethylene, polypropylene) workpiece.When production lot is less, dimensional precision and surfaceness without particular requirement and also mold sections little time, can adopt structural carbon steel SM50, SM55 steel or soft steel 10,20 steel making, the former adopts modified or normalizing treatment, and the latter adopts carburizing to add temper of quenching.Soft steel, because resistance to deformation is low, plasticity is good, is mainly used in the method compacting tool set mould cavity manufacture mould adopting cold-extrusion shaping.
Produce the flame retardant plastics mould of polyvinyl chloride, fluorinated plastic or interpolation fire retardant, due to contacting dies corrosive medium in pressing process, the plastic die steel that solidity to corrosion is good should be selected.
summary of the invention:
The object of the invention is to provide a kind of Steel for anti-corrosive plastic die and production method thereof for above-mentioned Problems existing, this steel has high hardness, intensity, wear resistance, enough toughness, and high hardening capacity, hardenability and and there is good corrosion resistance, be adapted to the needs of anticorrosive mould of plastics.
Above-mentioned object is realized by following technical scheme:
Steel for anti-corrosive plastic die, by mass percentage comprise 0.05%-0.18% C, 0.8-1.26% Mn, 0.13%-0.30% S, be not more than 0.04% Si, be not more than 0.02% P, Pb, the Bi of 0.05% ~ 0.08% of 0.21% ~ 0.29%, Mo, 0.10%---0.72% of W, 0.13%--2.78% of 0.19 ~ 0.43% the Al of Ti, 0.10%---0.72%, the Ni of 0.3%-0.8%, the Nb of 0.05%-0.12%, surplus is Fe and inevitable impurity.
Steel for anti-corrosive plastic die, by mass percentage comprise 0.07%-0.15% C, 0.85-1.23% Mn, 0.16%-0.27% S, be not more than 0.04% Si, be not more than 0.02% P, 0.22% ~ 0.28% Pb, the Bi of 0.06% ~ 0.08%, the Ti of Mo, 0.20%---0.68% of W, 1.22%--2.55% of 0.20 ~ 0.42%, the Al of 0.15% ~ 0.17%, the Ni of 0.35%-0.65%, the Nb of 0.09%-0.12%, surplus is Fe and inevitable impurity.
Steel for anti-corrosive plastic die, by mass percentage comprise 0.11% C, 0.88% Mn, 1.25% S, be not more than the Si of 0.04%, be not more than P, the Pb of 0.25%, Bi, the W of 0.15%, Mo, the Ti of 0.65%, the Al of 0.16% of 1.75% of 0.07% of 0.02%, the Ni of 0.5%, the Nb of 0.08%, surplus is Fe and inevitable impurity.
A kind of production method of Steel for anti-corrosive plastic die, the method comprises: according to said ratio, raw material is carried out molten iron pre-desulfurization successively, converter top bottom blowing, end Stirring by Ar Blowing, described bottom blowing Ar churning time is no less than 5 minutes, then carry out carrying out vacuum circulation degassing process after trimming obtains said ratio through RH stove, ensure that the pure degassing time of RH is no less than 3 minutes, whole process is adopted to blow Ar protective casting again, be cast into steel ingot, steel ingot reheats postheat treatment through process furnace, thermal treatment initial temperature is 950 DEG C ~ 980 DEG C, time 1-2 hour, thermal treatment end temp is 1050 DEG C ~ 1050 DEG C, tempering temperature is 830 DEG C ~ 880 DEG C, tempering time 2 hours, quenching temperature 600 DEG C ~ 650 DEG C.
Beneficial effect:
1. show through the present inventor's experimental study repeatedly: the high atmospheric corrosion resistance ability that can reduce steel of carbon amounts, the high carbon steel in stock ground is with regard to easy-to-rust in the open, the C of 0.05%-0.18% is adopted in the present invention, make Steel for anti-corrosive plastic die of the present invention have the premium properties such as hot strength and alkali resistance burn into resistance to oxidation, be applicable to the requirement of anticorrosive mould of plastics;
The present invention contains the Mn of 0.8-1.26%, makes cutting easily cataclasm, and is conducive to the quality improving finished surface; The S of 0.13%-0.30% improves the machinability of steel, artificially sulphur content is improved, and to form sulfide, plays and interrupts the successional effect of matrix;
Si, reinforced ferrite, improve intensity and the hardness of steel, reduce the critical cooling velocity of steel, improve the hardening capacity of steel, improve the solidity to corrosion in the oxidizing corrosion medium of steel, improve the thermotolerance of steel;
The present invention adopts the Pb of 0.21% ~ 0.29%, and plumbous be fine metal particles form in steel, is uniformly distributed or is attached to around sulfide.Because the fusing point of lead is lower, during cutting, lubricate is oozed out in melting, reduces friction, improves machinability, but does not affect ambient temperature mechanical properties;
Because mould is when thermal treatment, especially in quenching process, volume change, shape distortion, distortion etc. be produced, for ensureing die quality, require that the heat treatment deformation of die steel is little, particularly for complex-shaped precision die, after quenching, be difficult to finishing, requirement for heat treatment deformation degree is more harsh, the present invention adopts the W of 0.19 ~ 0.43%, improves the intensity of steel, improves the hot strength of steel, improve the resistant to hydrogen performance of steel, make steel have thermohardening;
The present invention adopts the Mo of 0.13%--2.78%, and molybdenum has solution strengthening effect to ferrite, improves steel heat resistance, the effect that resistant to hydrogen corrodes, and improves the hardening capacity of steel.
Because mould is in heat-processed, if to be oxidized, decarburization phenomenon, its hardness, wear resistance, use properties and work-ing life will be made to reduce; Therefore, require that the oxidation of die steel, Decarburization Sensitivity are good.The present invention adopts the Ti of 0.10%---0.72%, can improve the heat resistance of steel, improves creep-resistant property and the creep rupture strength of steel.And the stability of steel in High Temperature High Pressure hydrogen can be improved.Make steel under high pressure to the stability of hydrogen up to more than 600 DEG C, in perlite low alloy steel, titanium can stop molybdenum steel greying phenomenon at high temperature.
The present invention adopts the Al of 0.10%---0.72%, and deoxidation when being used as steel-making determines nitrogen agent, crystal grain thinning, suppresses the timeliness of soft steel, improves the toughness of steel when low temperature, particularly reduce the brittle transition temperature of steel; Improve the antioxidant property of steel.
Containing the Ni of 0.3%-0.8% in steel of the present invention, the intensity of steel can be improved, and keep good plasticity and toughness.Nickel has higher corrosion resistance to soda acid, at high temperature has antirust and temperature capacity.
Containing the Nb of 0.05%-0.12% in steel of the present invention, can crystal grain thinning and reduce the superheated susceptivity of steel and temper brittleness, improve intensity, resistant to hydrogen, nitrogen, ammonia corrosion ability under weather-resistant and high temperature can be improved.Meet the requirement of anticorrosive die steel.
2. the effect of system of heat treatment process taked of the present invention is as follows:
Heating Steel Ingots temperature: Heating Steel Ingots temperature is set at the dissolving guaranteeing Ti element, the too high meeting of slab heating temperature causes steel ingot austenite crystal abnormal growth.
The thermal treatment of the following temperature of recrystallize: stop the thermal treatment of below temperature can increase the density of ferrite nucleation point in austenite by recrystallize, control ferrite and pearlite grain-size, this toughness for the effect and raising material that play refined crystalline strengthening is very crucial.
Thermal treatment end temp: take lower thermal treatment temp equally can effective thinning microstructure, improves the toughness of product.Due under low temperature, rate of diffusion is slow, and therefore low finishing temperature can also suppress the compound of Ti to be separated out, and increases the result that the reserved of Ti in sosoloid all can obtain lower transition temperature and increase precipitation strength in ferrite.
The present invention adopts average tempering, and carbide in steel is suitably assembled, and obtains the thicker tempered sorbite tissue of carbide particle (organizing similar to Spheroidizing Annealing), and thus, the steel of this condition of delivery have good machinability.
Quenching temperature: suitable quenching temperature is the important guarantee obtaining perlite and the ferrite grain size composition be applicable to, and is also the precipitation of Ti in 600 DEG C ~ 650 DEG C temperature ranges simultaneously, guarantees the homogeneity of the Dispersed precipitate of the compound of Ti in steel matrix.
3., because the present invention adopts rational proportioning, excellent complete processing, have good wear resistance and thermal fatigue resistance, corrosion resistance is strong simultaneously.
embodiment:
Embodiment 1:
Steel for anti-corrosive plastic die, by mass percentage comprise 0.05%-0.18% C, 0.8-1.26% Mn, 0.13%-0.30% S, be not more than 0.04% Si, be not more than 0.02% P, Pb, the Bi of 0.05% ~ 0.08% of 0.21% ~ 0.29%, Mo, 0.10%---0.72% of W, 0.13%--2.78% of 0.19 ~ 0.43% the Al of Ti, 0.10%---0.72%, the Ni of 0.3%-0.8%, the Nb of 0.05%-0.12%, surplus is Fe and inevitable impurity.
Embodiment 2
Steel for anti-corrosive plastic die, by mass percentage comprise 0.07%-0.15% C, 0.85-1.23% Mn, 0.16%-0.27% S, be not more than 0.04% Si, be not more than 0.02% P, 0.22% ~ 0.28% Pb, the Bi of 0.06% ~ 0.08%, the Ti of Mo, 0.20%---0.68% of W, 1.22%--2.55% of 0.20 ~ 0.42%, the Al of 0.15% ~ 0.17%, the Ni of 0.35%-0.65%, the Nb of 0.09%-0.12%, surplus is Fe and inevitable impurity.
Embodiment 3:
Steel for anti-corrosive plastic die, by mass percentage comprise 0.11% C, 0.88% Mn, 1.25% S, be not more than the Si of 0.04%, be not more than P, the Pb of 0.25%, Bi, the W of 0.15%, Mo, the Ti of 0.65%, the Al of 0.16% of 1.75% of 0.07% of 0.02%, the Ni of 0.5%, the Nb of 0.08%, surplus is Fe and inevitable impurity.
Embodiment 4:
Steel for anti-corrosive plastic die, by mass percentage comprise 0.18% C, 1.26% Mn, 0.30% S, be not more than the Si of 0.04%, be not more than P, the Pb of 0.29%, Bi, the W of 0.43%, Mo, the Ti of 0.10%, the Al of 0.10% of 0.13% of 0.08% of 0.02%, the Ni of 0.3%, the Nb of 0.12%, surplus is Fe and inevitable impurity.
Embodiment 5:
Steel for anti-corrosive plastic die, by mass percentage comprise 0.05% C, 0.8% Mn, 0.13% S, be not more than the Si of 0.04%, be not more than P, the Pb of 0.21%, Bi, the W of 0.19%, Mo, the Ti of 0.10%, the Al of 0.72% of 0.13% of 0.05% of 0.02%, the Ni of 0.8%, the Nb of 0.12%, surplus is Fe and inevitable impurity.
The production method of above-mentioned Steel for anti-corrosive plastic die, the method comprises: according to said ratio, raw material is carried out molten iron pre-desulfurization successively, converter top bottom blowing, end Stirring by Ar Blowing, described bottom blowing Ar churning time is no less than 5 minutes, then carry out carrying out vacuum circulation degassing process after trimming obtains said ratio through RH stove, ensure that the pure degassing time of RH is no less than 3 minutes, whole process is adopted to blow Ar protective casting again, be cast into steel ingot, steel ingot reheats postheat treatment through process furnace, thermal treatment initial temperature is 950 DEG C ~ 980 DEG C, time 1-2 hour, thermal treatment end temp is 1050 DEG C ~ 1050 DEG C, tempering temperature is 830 DEG C ~ 880 DEG C, tempering time 2 hours, quenching temperature 600 DEG C ~ 650 DEG C.
Technique means disclosed in the present invention program is not limited only to the technique means disclosed in above-mentioned technique means, also comprises and is equal to by above technical characteristic the technical scheme that replacement forms.Unaccomplished matter of the present invention, belongs to the common practise of those skilled in the art.
Claims (1)
1. a production method for Steel for anti-corrosive plastic die, is characterized in that: the method comprises: by mass percentage by the C of 0.11%, the Mn of 0.88%, the S of 1.25%, be not more than the Si of 0.04%, be not more than the P of 0.02%, the Pb of 0.25%, the Bi of 0.07%, the W of 0.15%, the Mo of 1.75%, the Ti of 0.65%, the Al of 0.16%, the Ni of 0.5%, the Nb of 0.08%, surplus is that the raw material of Fe carries out molten iron pre-desulfurization successively, converter top bottom blowing, end Stirring by Ar Blowing, described bottom blowing Ar churning time is no less than 5 minutes, then carry out carrying out vacuum circulation degassing process after trimming obtains said ratio through RH stove, ensure that the pure degassing time of RH is no less than 3 minutes, then adopt whole process to blow Ar protective casting, be cast into steel ingot, steel ingot reheats postheat treatment through process furnace, and thermal treatment initial temperature is 950 DEG C ~ 980 DEG C, time 1-2 hour, thermal treatment end temp is 1050 DEG C, tempering temperature is 830 DEG C ~ 880 DEG C, tempering time 2 hours, quenching temperature 600 DEG C ~ 650 DEG C.
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| CN111809115B (en) * | 2020-07-07 | 2021-09-14 | 鞍钢股份有限公司 | Super-thick plastic die steel with excellent impact corrosion wear resistance and preparation method thereof |
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| KR101239416B1 (en) * | 2007-04-18 | 2013-03-05 | 신닛테츠스미킨 카부시키카이샤 | Hot-worked steel material having excellent machinability and impact value |
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