CN104451417A - Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate - Google Patents
Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate Download PDFInfo
- Publication number
- CN104451417A CN104451417A CN201410844805.4A CN201410844805A CN104451417A CN 104451417 A CN104451417 A CN 104451417A CN 201410844805 A CN201410844805 A CN 201410844805A CN 104451417 A CN104451417 A CN 104451417A
- Authority
- CN
- China
- Prior art keywords
- steel
- molten steel
- plastic mold
- strand
- rolling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Treatment Of Steel In Its Molten State (AREA)
- Continuous Casting (AREA)
Abstract
The invention relates to a production process of a high-cleanliness non-quenched and tempered plastic mold thick steel plate. The high-cleanliness non-quenched and tempered plastic mold thick steel plate is chemically composed of, by weight percentage, 0.25-0.45% of carbon, 0.20-0.50% of silicon, 0.70-1.50% of manganese, 0.70-2.00% of chromium, 0.15-0.55% of molybdenum, less than 0.01% of phosphorus, less than 0.005% of sulfur, 0.0010-0.030% of calcium, balanced iron and inevitable impurities. The chemical composition is simple in design; by means of the C-Mn-Cr-Mo alloying technology, the content of Mn and Cr can be improved;, by adding a certain amount of Mo, conversion of austenite to ferrite and pearlite can be inhibited, so that the high-cleanliness non-quenched and tempered plastic mold thick steel plate can have high hardenability and obtain a bainite structure; without the elements of Ti and V which are prone to generating inclusions, relatively clean steel can be obtained. The high-cleanliness non-quenched and tempered plastic mold thick steel plate has the advantages of being internally clean and compact, low in content of inclusions and capable of fundamentally eliminating pores, can meet the requirements of advanced plastic molds on internal high quality of steel and can be applied to the plastic mold industries such as automobile and electric appliances.
Description
Technical field
The invention belongs to plastic die steel technical field, relate to a kind of high-cleanness non-quenching and tempering plastic mold steel process for producing thick plate.
Background technology
Along with developing rapidly of China's plastics industry, more and more higher to the specification of quality of work-ing life of mould of plastics, working accuracy and plastics, thus to die steel inside exist be mingled with, hole defect proposes higher requirement.All kinds of grading of insert (ASTM) of mixing of high-end user general requirement all will be not more than 2.0 grades, UT (Ultrasonic Testing) subsurface defect≤Φ 2mm equivalent flat-bottom hole.Therefore, develop inner inclusion, high-cleanness non-quenching and tempering plastic mold steel production technique that hole defect is few is an important topic.
The production technique of more early stage non-quenching and tempering plastic mold steel can not reach and control effectively to steel inner inclusion, hole defect, as patent No. CN101476086A discloses a kind of economic steel for plastic cavity die and manufacture method, the manufacture method that this patent provides is smelting, continuous casting/die casting, steel rolling, roll rear air cooling, then temper produce non-quenching and tempering plastic mold steel.But it is smelted, continuous casting/die casting has only illustrated this operation, rolling process only mentions that the temperature of process controls, and does not provide the method controlling steel billet, steel plate inner inclusion, hole defect, therefore can not now control effectively to steel inner inclusion, hole defect.
The production technique of nearest non-quenching and tempering plastic mold steel employs vacuum degassing technology and Continuous Casting Soft Reduction Technology, serve the effect reducing inside steel billet hole, center segregation and center porosity, as patent No. CN102268599B discloses a kind of non-modulation plastic die steel process for producing thick plate, the production technique that this patent provides adopts converter smelting, LF+RH refining, continuous casting to produce steel billet, casting process adopts soft reduction technique, steel rolling adopts controlled rolling, rolls rear water-cooled, then temper and produces non-quenching and tempering plastic mold steel.Its RH refinery practice has the ability of the generation reducing oxide compound, but does not have removal ability to inclusion content in melting steel; The measure that its casting process prevents Reoxides from generating is not enough, and steel inclusion is more unavoidably; This patent is at rolling process, adopt controlled rolling technology, the single pass draft of steel billet in austenite recrystallization district, accumulative draft are unavoidable less, thus to the hole of steel billet center porosity and the pressing scarce capacity of internal fissure, steel plate inner void and internal fissure are more unavoidably; Thus it is qualified that the steel-plate ultrasound ripple that this patent is produced is detected as I grade of GB/T2970 standard, is specially inner individual defect length≤80mm, far can not reaches the requirement of UT (Ultrasonic Testing) subsurface defect≤Φ 2mm equivalent flat-bottom hole.
In a word, existing non-quenching and tempering plastic mold steel production technique patented technology, is mingled with scarce capacity in smelting, the segregation of casting process prevention center, loose, shrinkage cavity, removal; Technical in Steel Rolling Control, the single pass draft of steel billet in austenite recrystallization district, accumulative draft are less, to the hole of steel billet center porosity and the pressing scarce capacity of internal fissure.
Summary of the invention
For overcoming above-mentioned technical disadvantages, the invention provides a kind of high-cleanness non-quenching and tempering plastic mold steel process for producing thick plate, it overcomes the more shortcoming of non-quenching and tempering plastic mold steel inner inclusion, hole, all kinds of grading of assorted insert (ASTM) that can realize steel plate is not more than 2.0 grades, UT (Ultrasonic Testing) subsurface defect≤Φ 2mm equivalent flat-bottom hole, steel plate Brinell hardness is 280 ~ 340HB.
The present invention solves the technological method that its technical problem adopts: a kind of high-cleanness non-quenching and tempering plastic mold steel slab, its chemical composition and mass percent thereof are: carbon 0.25 ~ 0.45%, silicon 0.20 ~ 0.50%, manganese 0.70 ~ 1.50%, chromium 0.70 ~ 2.00%, molybdenum 0.15 ~ 0.55%, phosphorus < 0.01%, sulphur < 0.005%, calcium 0.0010 ~ 0.0030%, and all the other are iron and inevitable impurity.
Above-mentioned chemical composition design is simple, by C ~ Mn ~ Cr ~ Mo alloying process, improve Mn, Cr content, add a certain amount of Mo, suppress austenite to ferrite and pearlitic transformation, make this steel have higher hardening capacity, obtain bainite structure, do not add the Ti, the V element that easily generate inclusion, easily obtain cleaner steel.
The production technique of above-mentioned high-cleanness non-quenching and tempering plastic mold steel slab, the steps include:
The first step: converter smelting, controls into converter molten iron S≤0.005%, pushing off the slag of keeping under strict control of tapping;
Second step: ladle furnace LF refining, refining is carried out to going out converter molten steel, obtained LF stove molten steel, ladle chemistry massfraction requires: carbon 0.25 ~ 0.45%, silicon 0.20 ~ 0.50%, manganese 0.70 ~ 1.50%, chromium 0.70 ~ 2.00%, molybdenum 0.15 ~ 0.55%, phosphorus < 0.01%, sulphur < 0.005%, and all the other are iron and inevitable impurity;
3rd step: vacuum degassing furnace RH refining, carries out vacuum outgas, total argon blowing time >=30 minute, evacuated pressure≤0.20kPa to going out LF stove molten steel, vacuum hold-time >=15min, carry out vacuum outgas to going out LF stove molten steel, obtained refined molten steel;
4th step: after ladle goes out RH stove, feeds CaSi line or FeCa alloy wire in molten steel, and to control calcium contents in molten steel be 0.0010 ~ 0.0030%;
5th step: after the 4th step Calcium treatment, carries out soft blow Ar gas from ladle bottom to molten steel, blow Ar gas time >=10 minutes;
6th step: during cast, ladle adopts long nozzle protection tapping to tundish, and tundish adopts submerged nozzle molding casting to crystallizer, and Metal in Tundish superheating temperature controls at 10 ~ 25 DEG C;
7th step: adopt induction stirring in the non-solidification zone of secondary cooling area for continuous casting molten steel, control electromagnetic stirring force, accelerate MOLTEN STEEL FLOW;
8th step: adopt soft reduction technique at secondary cooling area for continuous casting casting blank solidification end, total reduction controls 2.5 ~ 3.5%, and the draft in fan-shaped section unit length controls at 1 ~ 3.5mm/m;
9th step: the strand heap that rolls off the production line is chilled to less than 500 DEG C;
Tenth step: strand heats: adopt heat to send temperature dress technique, charging temperature 250 ~ 500 DEG C, shove charge after preheating wanted by cold base, and the strand heating entity time presses slab thickness timing rate 10 ~ 12min/cm and controls, Heating temperature 1150 ~ 1250 DEG C;
11 step: rolling: strand adopts the normalizing rolling mode rolling of large pressure, require strand compression ratio >3, start rolling temperature is 1050 ~ 1150 DEG C, except breaking down de-scaling, spread with except finish to gauge shaping passage, one-pass roller draft >=15%, finishing temperature is 920 ~ 950 DEG C;
12 step: air cooling to 400 ~ 450 DEG C after rolling, the heap that rolls off the production line is chilled to < 200 DEG C;
13 step: then 450 ~ 640 DEG C of tempering, adjustment hardness.
What wherein adopt in the 4th step is Ca treatment technology, effect mainly makes oxide compound and sulfide sex change in steel, by sulfide and oxide compound nodularization, be conducive to inclusion and float in molten steel, remove, when deposit spherical be mingled with and be in steel time have reduce steel processing crack sensitivity effect.
Wherein the 5th step employing is ladle bottom soft blow Ar gas technology, and effect is the adhesive attraction utilizing Ar gas buoyancy and Ar bubble, promotes that steel inclusion floats, and makes Slag Layer absorb the inclusion floated, thus is mingled with in removal steel.Ladle bottom is equipped with gas permeable brick for blowing Ar gas in molten steel, and the installation site of gas permeable brick in the position being conducive to inclusion floating, should be blown Ar amount and should control Slag Layer is slightly stirred, prevent from turning over air-breathing greatly.
Wherein the 6th step carries out omnidistance molding casting to molten steel in casting process, prevents secondary oxidation of steel.Molten steel overheat controls in lower scope, is conducive to the segregation, the shrinkage cavity that reduce strand.
Wherein the 7th step adopts two chill space electromagnetic stirring technology, and effect interrupts the casting blank solidification forward position dendrite tip to become equiax crystal core and make grain refining form fine and closely woven equiax crystal; Because induction stirring accelerates MOLTEN STEEL FLOW, strand core temperature is reduced and solidified front temperature improves, favourable outside heat transfer, be both conducive to improving equiaxial crystal ratio, the raising of equiaxial crystal ratio, favourable central pipe and the center segregation of improving; Because in base shell, liquid core temperature and shell thickness are tending towards even, slow down the internal fissure produced due to thermal stresses.
8th step adopts solidification end soft reduction technique, is for casting blank solidification characteristic, applies suitable draught to compensate the solidification shrinkage of base shell and to stop the transverse flow of remaining molten steel at casting blank solidification end.The internal voids that strand shrinks formation can be eliminated or reduce to pressure on the one hand, prevents the transverse flow of molten steel to strand of intergranular solute element; On the other hand, pressure can make the molten steel of solute element enrichment in liquid core along throwing direction reversed flow, solute element is redistributed in molten steel, thus improves center segregation situation.
11 step adopts large pressure normalizing rolling technology, principle is that steel billet carries out heavy reduction rolling in austenite recrystallization district, single pass draught requires more than >=15%, rolling deformation reaches steel billet heart portion, and strand compression ratio >3, ensure that steel billet heart portion is fully out of shape, can the hole of pressing center porosity and internal fissure, reduce the hole even eliminating steel billet center porosity.
The invention has the beneficial effects as follows: adopt C-Mn-Cr-Mo alloying process to carry out Composition Design, do not subtract the generation of inclusion, adopt LF+RH refining techniques, Ca treatment technology, ladle bottom blowing Ar technology, whole process protection placingJi Shu, two chill space electromagnetic stirring technology, solidification end soft reduction technique, large pressure normalizing rolling technology, multiple method reduces inside steel billet and is mingled with, hole defect, reduce the hole that even elimination steel billet center porosity causes, steel plate is inner clean fine and close, inclusion is few, basically eliminate hole, be applicable to the inner inclusion of Compression Ratio of Casting Billet >3, the production of the high-cleanness non-quenching and tempering plastic mold steel plate that hole defect is few, do not need modifier treatment can obtain good mechanical property.The steel plate adopting the present invention to produce can reach following index: steel plate Brinell hardness is 280-340HB, steel plate is inner clean fine and close, inclusion is few, all kinds of grading of assorted insert (ASTM) of thickness specification≤80mm plate is not more than 2.0 grades, UT (Ultrasonic Testing) subsurface defect≤Φ 2mm equivalent flat-bottom hole, good combination property, have inner clean fine and close, inclusion is few, the feature of basically eliminate hole, high quality plastic mould can be met to the high-quality requirement in steel plate inside, can be used for the mould of plastics such as automobile, electrical equipment industry.
embodiment
Below in conjunction with embodiment, the present invention is further described.
A kind of high-cleanness non-quenching and tempering plastic mold steel slab, its chemical composition and mass percent thereof are: carbon 0.25 ~ 0.45%, silicon 0.20 ~ 0.50%, manganese 0.70 ~ 1.50%, chromium 0.70 ~ 2.00%, molybdenum 0.15 ~ 0.55%, phosphorus < 0.01%, sulphur < 0.005%, calcium 0.0010 ~ 0.0030%, and all the other are iron and inevitable impurity.
Above-mentioned chemical composition design is simple, by C ~ Mn ~ Cr ~ Mo alloying process, improve Mn, Cr content, add a certain amount of Mo, suppress austenite to ferrite and pearlitic transformation, make this steel have higher hardening capacity, obtain bainite structure, do not add the Ti, the V element that easily generate inclusion, easily obtain cleaner steel.
The production technique of above-mentioned high-cleanness non-quenching and tempering plastic mold steel slab, the steps include:
The first step: converter smelting, controls into converter molten iron S≤0.005%, pushing off the slag of keeping under strict control of tapping;
Second step: ladle furnace LF refining, refining is carried out to going out converter molten steel, obtained LF stove molten steel, ladle chemistry massfraction requires: carbon 0.25 ~ 0.45%, silicon 0.20 ~ 0.50%, manganese 0.70 ~ 1.50%, chromium 0.70 ~ 2.00%, molybdenum 0.15 ~ 0.55%, phosphorus < 0.01%, sulphur < 0.005%, and all the other are iron and inevitable impurity;
3rd step: vacuum degassing furnace RH refining, carries out vacuum outgas, total argon blowing time >=30 minute, evacuated pressure≤0.20kPa to going out LF stove molten steel, vacuum hold-time >=15min, carry out vacuum outgas to going out LF stove molten steel, obtained refined molten steel;
4th step: after ladle goes out RH stove, feeds CaSi line or FeCa alloy wire in molten steel, and to control calcium contents in molten steel be 0.0010 ~ 0.0030%;
5th step: after the 4th step Calcium treatment, carries out soft blow Ar gas from ladle bottom to molten steel, blow Ar gas time >=10 minutes;
6th step: during cast, ladle adopts long nozzle protection tapping to tundish, and tundish adopts submerged nozzle molding casting to crystallizer, and Metal in Tundish superheating temperature controls at 10 ~ 25 DEG C;
7th step: adopt induction stirring in the non-solidification zone of secondary cooling area for continuous casting molten steel, control electromagnetic stirring force, accelerate MOLTEN STEEL FLOW;
8th step: adopt soft reduction technique at secondary cooling area for continuous casting casting blank solidification end, total reduction controls 2.5 ~ 3.5%, and the draft in fan-shaped section unit length controls at 1 ~ 3.5mm/m;
9th step: the strand heap that rolls off the production line is chilled to less than 500 DEG C;
Tenth step: strand heats: adopt heat to send temperature dress technique, charging temperature 250 ~ 500 DEG C, shove charge after preheating wanted by cold base, and the strand heating entity time presses slab thickness timing rate 10 ~ 12min/cm and controls, Heating temperature 1150 ~ 1250 DEG C;
11 step: rolling: strand adopts the normalizing rolling mode rolling of large pressure, require strand compression ratio >3, start rolling temperature is 1050 ~ 1150 DEG C, except breaking down de-scaling, spread with except finish to gauge shaping passage, one-pass roller draft >=15%, finishing temperature is 920 ~ 950 DEG C;
12 step: air cooling to 400 ~ 450 DEG C after rolling, the heap that rolls off the production line is chilled to < 200 DEG C;
13 step: then 450 ~ 640 DEG C of tempering, adjustment hardness.
What wherein adopt in the 4th step is Ca treatment technology, effect mainly makes oxide compound and sulfide sex change in steel, by sulfide and oxide compound nodularization, be conducive to inclusion and float in molten steel, remove, when deposit spherical be mingled with and be in steel time have reduce steel processing crack sensitivity effect.
Wherein the 5th step employing is ladle bottom soft blow Ar gas technology, and effect is the adhesive attraction utilizing Ar gas buoyancy and Ar bubble, promotes that steel inclusion floats, and makes Slag Layer absorb the inclusion floated, thus is mingled with in removal steel.Ladle bottom is equipped with gas permeable brick for blowing Ar gas in molten steel, and the installation site of gas permeable brick in the position being conducive to inclusion floating, should be blown Ar amount and should control Slag Layer is slightly stirred, prevent from turning over air-breathing greatly.
Wherein the 6th step carries out omnidistance molding casting to molten steel in casting process, prevents secondary oxidation of steel.Molten steel overheat controls in lower scope, is conducive to the segregation, the shrinkage cavity that reduce strand.
Wherein the 7th step adopts two chill space electromagnetic stirring technology, and effect interrupts the casting blank solidification forward position dendrite tip to become equiax crystal core and make grain refining form fine and closely woven equiax crystal; Because induction stirring accelerates MOLTEN STEEL FLOW, strand core temperature is reduced and solidified front temperature improves, favourable outside heat transfer, be both conducive to improving equiaxial crystal ratio, the raising of equiaxial crystal ratio, favourable central pipe and the center segregation of improving; Because in base shell, liquid core temperature and shell thickness are tending towards even, slow down the internal fissure produced due to thermal stresses.
Wherein the 8th step adopts solidification end soft reduction technique, is for casting blank solidification characteristic, applies suitable draught to compensate the solidification shrinkage of base shell and to stop the transverse flow of remaining molten steel at casting blank solidification end.The internal voids that strand shrinks formation can be eliminated or reduce to pressure on the one hand, prevents the transverse flow of molten steel to strand of intergranular solute element; On the other hand, pressure can make the molten steel of solute element enrichment in liquid core along throwing direction reversed flow, solute element is redistributed in molten steel, thus improves center segregation situation.
11 step adopts large pressure normalizing rolling technology, principle is that steel billet carries out heavy reduction rolling in austenite recrystallization district, single pass draught requires more than >=15%, rolling deformation reaches steel billet heart portion, and strand compression ratio >3, ensure that steel billet heart portion is fully out of shape, can the hole of pressing center porosity and internal fissure, reduce the hole even eliminating steel billet center porosity.
In chemical composition ranges of the present invention, determine that embodiment chemical composition is as shown in table 1, metallurgy and foundry step and controling parameters as shown in table 2, rolling, cooling, heat treatment step and controling parameters are as shown in table 3, obtained steel plate for plastic mould hardness, inclusion, UT (Ultrasonic Testing) assay are as shown in table 4, wherein, contrast 1 be the non-modulation plastic die steel process for producing thick plate of patent publication No. CN102268599B mono-kind, and contrasting 2 is patent publication No. CN101476086A economic steel for plastic cavity die and manufacture method.
Table 1 chemical composition (wt%)
Table 2 metallurgy and foundry system
Table 3 rolling, cooling, heat treating regime
Table 4 steel plate hardness, inclusion, UT (Ultrasonic Testing) assay
Show that the present invention adopts C-Mn-Cr-Mo alloying process to carry out Composition Design from upper table, do not subtract the generation of inclusion, adopt LF+RH refining techniques, Ca treatment technology, ladle bottom blowing Ar technology, whole process protection placingJi Shu, two chill space electromagnetic stirring technology, solidification end soft reduction technique, large pressure normalizing rolling technology, multiple method reduces inside steel billet and is mingled with, hole defect, reduce the hole that even elimination steel billet center porosity causes, steel plate is inner clean fine and close, inclusion is few, basically eliminate hole, be applicable to the inner inclusion of Compression Ratio of Casting Billet >3, the production of the high-cleanness non-quenching and tempering plastic mold steel plate that hole defect is few, do not need modifier treatment can obtain good mechanical property, the steel plate adopting the present invention to produce can reach following index: steel plate Brinell hardness is 280-340HB, steel plate is inner clean fine and close, inclusion is few, all kinds of grading of assorted insert (ASTM) of thickness specification≤80mm plate is not more than 2.0 grades, UT (Ultrasonic Testing) subsurface defect≤Φ 2mm equivalent flat-bottom hole, good combination property, have inner clean fine and close, inclusion is few, the feature of basically eliminate hole, high quality plastic mould can be met to the high-quality requirement in steel plate inside, can be used for automobile, the mould of plastics industries such as electrical equipment.
Claims (8)
1. a high-cleanness non-quenching and tempering plastic mold steel slab, it is characterized in that chemical composition and mass percent thereof are: carbon 0.25 ~ 0.45%, silicon 0.20 ~ 0.50%, manganese 0.70 ~ 1.50%, chromium 0.70 ~ 2.00%, molybdenum 0.15 ~ 0.55%, phosphorus < 0.01%, sulphur < 0.005%, calcium 0.0010 ~ 0.0030%, all the other are iron and inevitable impurity;
Above-mentioned chemical composition design is simple, by C ~ Mn ~ Cr ~ Mo alloying process, improve Mn, Cr content, add a certain amount of Mo, suppress austenite to ferrite and pearlitic transformation, make this steel have higher hardening capacity, obtain bainite structure, do not add the Ti, the V element that easily generate inclusion, easily obtain cleaner steel.
2. the production technique of above-mentioned high-cleanness non-quenching and tempering plastic mold steel slab, is characterized in that step is:
The first step: converter smelting, controls into converter molten iron S≤0.005%, pushing off the slag of keeping under strict control of tapping;
Second step: ladle furnace LF refining, refining is carried out to going out converter molten steel, obtained LF stove molten steel, ladle chemistry massfraction requires: carbon 0.25 ~ 0.45%, silicon 0.20 ~ 0.50%, manganese 0.70 ~ 1.50%, chromium 0.70 ~ 2.00%, molybdenum 0.15 ~ 0.55%, phosphorus < 0.01%, sulphur < 0.005%, and all the other are iron and inevitable impurity;
3rd step: vacuum degassing furnace RH refining, carries out vacuum outgas, total argon blowing time >=30 minute, evacuated pressure≤0.20kPa to going out LF stove molten steel, vacuum hold-time >=15min, carry out vacuum outgas to going out LF stove molten steel, obtained refined molten steel;
4th step: after ladle goes out RH stove, feeds CaSi line or FeCa alloy wire in molten steel, and to control calcium contents in molten steel be 0.0010 ~ 0.0030%;
5th step: after the 4th step Calcium treatment, carries out soft blow Ar gas from ladle bottom to molten steel, blow Ar gas time >=10 minutes;
6th step: during cast, ladle adopts long nozzle protection tapping to tundish, and tundish adopts submerged nozzle molding casting to crystallizer, and Metal in Tundish superheating temperature controls at 10 ~ 25 DEG C;
7th step: adopt induction stirring in the non-solidification zone of secondary cooling area for continuous casting molten steel, control electromagnetic stirring force, accelerate MOLTEN STEEL FLOW;
8th step: adopt soft reduction technique at secondary cooling area for continuous casting casting blank solidification end, total reduction controls 2.5 ~ 3.5%, and the draft in fan-shaped section unit length controls at 1 ~ 3.5mm/m;
9th step: the strand heap that rolls off the production line is chilled to less than 500 DEG C;
Tenth step: strand heats: adopt heat to send temperature dress technique, charging temperature 250 ~ 500 DEG C, shove charge after preheating wanted by cold base, and the strand heating entity time presses slab thickness timing rate 10 ~ 12min/cm and controls, Heating temperature 1150 ~ 1250 DEG C;
11 step: rolling: strand adopts the normalizing rolling mode rolling of large pressure, require strand compression ratio >3, start rolling temperature is 1050 ~ 1150 DEG C, except breaking down de-scaling, spread with except finish to gauge shaping passage, one-pass roller draft >=15%, finishing temperature is 920 ~ 950 DEG C;
12 step: air cooling to 400 ~ 450 DEG C after rolling, the heap that rolls off the production line is chilled to < 200 DEG C;
13 step: then 450 ~ 640 DEG C of tempering, adjustment hardness.
3. the production technique of high-cleanness non-quenching and tempering plastic mold steel slab as claimed in claim 2, what it is characterized in that adopting in wherein the 4th step is Ca treatment technology, effect mainly makes oxide compound and sulfide sex change in steel, by sulfide and oxide compound nodularization, be conducive to inclusion to float in molten steel, remove, when deposit spherical be mingled with and be in steel time have reduce steel processing crack sensitivity effect.
4. the production technique of high-cleanness non-quenching and tempering plastic mold steel slab as claimed in claim 2, what it is characterized in that wherein the 5th step employing is ladle bottom soft blow Ar gas technology, effect is the adhesive attraction utilizing Ar gas buoyancy and Ar bubble, promote that steel inclusion floats, make Slag Layer absorb the inclusion floated, thus be mingled with in removal steel; Ladle bottom is equipped with gas permeable brick for blowing Ar gas in molten steel, and the installation site of gas permeable brick in the position being conducive to inclusion floating, should be blown Ar amount and should control Slag Layer is slightly stirred, prevent from turning over air-breathing greatly.
5. the production technique of high-cleanness non-quenching and tempering plastic mold steel slab as claimed in claim 2, is characterized in that wherein the 6th step carries out omnidistance molding casting to molten steel in casting process, prevents secondary oxidation of steel; Molten steel overheat controls in lower scope, is conducive to the segregation, the shrinkage cavity that reduce strand.
6. the production technique of high-cleanness non-quenching and tempering plastic mold steel slab as claimed in claim 2, it is characterized in that wherein the 7th step adopts two chill space electromagnetic stirring technology, effect interrupts the casting blank solidification forward position dendrite tip to become equiax crystal core and make grain refining form fine and closely woven equiax crystal; Because induction stirring accelerates MOLTEN STEEL FLOW, strand core temperature is reduced and solidified front temperature improves, favourable outside heat transfer, be both conducive to improving equiaxial crystal ratio, the raising of equiaxial crystal ratio, favourable central pipe and the center segregation of improving; Because in base shell, liquid core temperature and shell thickness are tending towards even, slow down the internal fissure produced due to thermal stresses.
7. the production technique of high-cleanness non-quenching and tempering plastic mold steel slab as claimed in claim 2, it is characterized in that the 8th step adopts solidification end soft reduction technique, be for casting blank solidification characteristic, apply suitable draught to compensate the solidification shrinkage of base shell and to stop the transverse flow of remaining molten steel at casting blank solidification end; The internal voids that strand shrinks formation can be eliminated or reduce to pressure on the one hand, prevents the transverse flow of molten steel to strand of intergranular solute element; On the other hand, pressure can make the molten steel of solute element enrichment in liquid core along throwing direction reversed flow, solute element is redistributed in molten steel, thus improves center segregation situation.
8. the production technique of high-cleanness non-quenching and tempering plastic mold steel slab as claimed in claim 2, it is characterized in that the 11 step adopts large pressure normalizing rolling technology, principle is that steel billet carries out heavy reduction rolling in austenite recrystallization district, single pass draught requires more than >=15%, rolling deformation reaches steel billet heart portion, and strand compression ratio >3, ensure that steel billet heart portion is fully out of shape, can the hole of pressing center porosity and internal fissure, reduce the hole even eliminating steel billet center porosity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410844805.4A CN104451417A (en) | 2014-12-31 | 2014-12-31 | Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410844805.4A CN104451417A (en) | 2014-12-31 | 2014-12-31 | Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104451417A true CN104451417A (en) | 2015-03-25 |
Family
ID=52898156
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410844805.4A Pending CN104451417A (en) | 2014-12-31 | 2014-12-31 | Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104451417A (en) |
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106544469A (en) * | 2016-11-25 | 2017-03-29 | 芜湖新兴铸管有限责任公司 | The method for reducing the D type impurities in steel-making |
| CN106811687A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of economical plastic steel plate for die and manufacture method |
| CN106893833A (en) * | 2017-02-17 | 2017-06-27 | 舞阳钢铁有限责任公司 | A kind of production method of the big substance High Clean Steel Melts of big thickness |
| CN107058897A (en) * | 2017-03-22 | 2017-08-18 | 唐山钢铁集团有限责任公司 | A kind of high manganese pre-hardening plastic steel plate for die and its production method |
| CN107151762A (en) * | 2017-04-19 | 2017-09-12 | 辽宁科技大学 | A kind of smelting continuous casting method of alloy die steel 1.2311 |
| CN107460292A (en) * | 2017-08-04 | 2017-12-12 | 北京首钢股份有限公司 | A kind of processing method for improving low temperature high magnetic induction grain-oriented silicon steel edge performance |
| CN108165888A (en) * | 2018-01-12 | 2018-06-15 | 唐山钢铁集团有限责任公司 | A kind of 4140 plastic steel plate for die and its production method of annealed state delivery |
| CN106811687B (en) * | 2015-12-02 | 2018-08-31 | 鞍钢股份有限公司 | A kind of economical plastic steel plate for die and manufacturing method |
| CN109136736A (en) * | 2017-06-28 | 2019-01-04 | 广东韶钢松山股份有限公司 | One kind plastic steel plate for die containing vanadium and its manufacturing method |
| 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 |
| CN109694983A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of high mirror surface corrosion-resistant plastic mould steel and its manufacturing method |
| CN110527922A (en) * | 2019-10-18 | 2019-12-03 | 福建三钢闽光股份有限公司 | A kind of full bainite structure plastic die steel of self tempering and preparation method thereof |
| CN110578096A (en) * | 2019-10-24 | 2019-12-17 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
| CN111172448A (en) * | 2018-11-12 | 2020-05-19 | 中国科学院金属研究所 | Preparation method of thick, large and high-homogeneity plastic die steel |
| CN111455255A (en) * | 2020-03-30 | 2020-07-28 | 江阴兴澄特种钢铁有限公司 | Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm |
| CN113265575A (en) * | 2021-04-26 | 2021-08-17 | 五矿营口中板有限责任公司 | Preparation method of extra-thick Mn-Cr series die steel |
| WO2022152158A1 (en) * | 2021-01-12 | 2022-07-21 | 宝山钢铁股份有限公司 | High-strength and toughness free-cutting non-quenched and tempered round steel and manufacturing method therefor |
| CN114959497A (en) * | 2022-06-27 | 2022-08-30 | 宝武集团鄂城钢铁有限公司 | Pre-hardened alloy plastic die steel and production method thereof |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760701A (en) * | 2009-12-25 | 2010-06-30 | 舞阳钢铁有限责任公司 | Alloy-plastic steel plate for die and production method thereof |
| CN102002638A (en) * | 2010-09-20 | 2011-04-06 | 南京钢铁股份有限公司 | Process for producing plastic mould steel thick plate with uniform section rigidity |
| 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 |
| CN102268599A (en) * | 2011-08-01 | 2011-12-07 | 南京钢铁股份有限公司 | Production technology of non-modulated plastic die steel thick plate |
| CN102899571A (en) * | 2011-07-25 | 2013-01-30 | 宝山钢铁股份有限公司 | Pre-hardening type plastic mold steel and manufacturing method thereof |
| CN103397261A (en) * | 2013-07-31 | 2013-11-20 | 首钢总公司 | Steel plate for plastic mold for rolling continuous casting slab with thickness of 400mm and production method of steel plate |
| CN103710625A (en) * | 2013-12-20 | 2014-04-09 | 莱芜钢铁集团有限公司 | High-toughness plastic die steel and production method thereof |
| CN103757544A (en) * | 2013-12-05 | 2014-04-30 | 南京钢铁股份有限公司 | Economical non-quenched and non-tempered micro-alloyed plastic die steel plate and making method thereof |
| CN103981451A (en) * | 2014-05-28 | 2014-08-13 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolling and tempering type Mo-free plastic die steel plate and manufacturing method thereof |
| CN103981447A (en) * | 2014-05-28 | 2014-08-13 | 江苏省沙钢钢铁研究院有限公司 | Low-cost Mo-free plastic mould steel plate and production technology thereof |
-
2014
- 2014-12-31 CN CN201410844805.4A patent/CN104451417A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101760701A (en) * | 2009-12-25 | 2010-06-30 | 舞阳钢铁有限责任公司 | Alloy-plastic steel plate for die and production method thereof |
| CN102002638A (en) * | 2010-09-20 | 2011-04-06 | 南京钢铁股份有限公司 | Process for producing plastic mould steel thick plate with uniform section rigidity |
| 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 |
| CN102899571A (en) * | 2011-07-25 | 2013-01-30 | 宝山钢铁股份有限公司 | Pre-hardening type plastic mold steel and manufacturing method thereof |
| CN102268599A (en) * | 2011-08-01 | 2011-12-07 | 南京钢铁股份有限公司 | Production technology of non-modulated plastic die steel thick plate |
| CN103397261A (en) * | 2013-07-31 | 2013-11-20 | 首钢总公司 | Steel plate for plastic mold for rolling continuous casting slab with thickness of 400mm and production method of steel plate |
| CN103757544A (en) * | 2013-12-05 | 2014-04-30 | 南京钢铁股份有限公司 | Economical non-quenched and non-tempered micro-alloyed plastic die steel plate and making method thereof |
| CN103710625A (en) * | 2013-12-20 | 2014-04-09 | 莱芜钢铁集团有限公司 | High-toughness plastic die steel and production method thereof |
| CN103981451A (en) * | 2014-05-28 | 2014-08-13 | 江苏省沙钢钢铁研究院有限公司 | Hot-rolling and tempering type Mo-free plastic die steel plate and manufacturing method thereof |
| CN103981447A (en) * | 2014-05-28 | 2014-08-13 | 江苏省沙钢钢铁研究院有限公司 | Low-cost Mo-free plastic mould steel plate and production technology thereof |
Non-Patent Citations (3)
| Title |
|---|
| 孙玮: "《中厚板生产900问》", 31 July 2014, 冶金工业出版社 * |
| 杨吉春: "《钢铁冶金800问》", 30 November 2012, 化学工业出版社 * |
| 秦勤: "《连铸设备的热行为及力学行为》", 30 April 2013, 冶金工业出版社 * |
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106811687B (en) * | 2015-12-02 | 2018-08-31 | 鞍钢股份有限公司 | A kind of economical plastic steel plate for die and manufacturing method |
| CN106811687A (en) * | 2015-12-02 | 2017-06-09 | 鞍钢股份有限公司 | A kind of economical plastic steel plate for die and manufacture method |
| CN106544469A (en) * | 2016-11-25 | 2017-03-29 | 芜湖新兴铸管有限责任公司 | The method for reducing the D type impurities in steel-making |
| CN106893833A (en) * | 2017-02-17 | 2017-06-27 | 舞阳钢铁有限责任公司 | A kind of production method of the big substance High Clean Steel Melts of big thickness |
| CN107058897A (en) * | 2017-03-22 | 2017-08-18 | 唐山钢铁集团有限责任公司 | A kind of high manganese pre-hardening plastic steel plate for die and its production method |
| CN107151762A (en) * | 2017-04-19 | 2017-09-12 | 辽宁科技大学 | A kind of smelting continuous casting method of alloy die steel 1.2311 |
| CN107151762B (en) * | 2017-04-19 | 2018-09-21 | 辽宁科技大学 | A kind of smelting continuous casting method of alloy die steel 1.2311 |
| CN109136736A (en) * | 2017-06-28 | 2019-01-04 | 广东韶钢松山股份有限公司 | One kind plastic steel plate for die containing vanadium and its manufacturing method |
| 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 |
| CN107460292A (en) * | 2017-08-04 | 2017-12-12 | 北京首钢股份有限公司 | A kind of processing method for improving low temperature high magnetic induction grain-oriented silicon steel edge performance |
| CN109694983B (en) * | 2017-10-20 | 2020-09-29 | 鞍钢股份有限公司 | High-mirror-surface corrosion-resistant plastic die steel and manufacturing method thereof |
| CN109694983A (en) * | 2017-10-20 | 2019-04-30 | 鞍钢股份有限公司 | A kind of high mirror surface corrosion-resistant plastic mould steel and its manufacturing method |
| CN108165888A (en) * | 2018-01-12 | 2018-06-15 | 唐山钢铁集团有限责任公司 | A kind of 4140 plastic steel plate for die and its production method of annealed state delivery |
| CN111172448B (en) * | 2018-11-12 | 2021-09-24 | 中国科学院金属研究所 | Preparation method of thick, large and high-homogeneity plastic die steel |
| CN111172448A (en) * | 2018-11-12 | 2020-05-19 | 中国科学院金属研究所 | Preparation method of thick, large and high-homogeneity plastic die steel |
| CN110527922A (en) * | 2019-10-18 | 2019-12-03 | 福建三钢闽光股份有限公司 | A kind of full bainite structure plastic die steel of self tempering and preparation method thereof |
| CN110578096B (en) * | 2019-10-24 | 2021-04-30 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
| CN110578096A (en) * | 2019-10-24 | 2019-12-17 | 广东韶钢松山股份有限公司 | Non-quenched and tempered steel for crankshaft, crankshaft forging and preparation process thereof |
| CN111455255A (en) * | 2020-03-30 | 2020-07-28 | 江阴兴澄特种钢铁有限公司 | Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm |
| CN111455255B (en) * | 2020-03-30 | 2022-05-06 | 江阴兴澄特种钢铁有限公司 | Preparation method of EH36 steel for extra-thick offshore wind power with thickness of 80-100mm |
| WO2022152158A1 (en) * | 2021-01-12 | 2022-07-21 | 宝山钢铁股份有限公司 | High-strength and toughness free-cutting non-quenched and tempered round steel and manufacturing method therefor |
| CN113265575A (en) * | 2021-04-26 | 2021-08-17 | 五矿营口中板有限责任公司 | Preparation method of extra-thick Mn-Cr series die steel |
| CN114959497A (en) * | 2022-06-27 | 2022-08-30 | 宝武集团鄂城钢铁有限公司 | Pre-hardened alloy plastic die steel and production method thereof |
| CN114959497B (en) * | 2022-06-27 | 2022-11-11 | 宝武集团鄂城钢铁有限公司 | Pre-hardened alloy plastic die steel and production method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104451417A (en) | Production process of high-cleanliness non-quenched and tempered plastic mold thick steel plate | |
| CN103540838B (en) | A kind of Steel plate for low-temperature vessel and production method | |
| CN101289731B (en) | CrMnTi narrow hardenability strip pinion steels and method of manufacture | |
| CN100369681C (en) | Compound high speed steel roll and its making process | |
| CN104032214B (en) | A kind of non-hardened and tempered steel and production technique thereof | |
| CN105369150B (en) | A kind of superhigh intensity armor manufacture method | |
| CN103556069B (en) | A kind of gas cylinder seamless large-diameter pipes and manufacture method thereof | |
| CN104988434B (en) | A kind of production technology of sulfur-bearing mould of plastics steel thick plate | |
| US20160230247A1 (en) | Non quenched and tempered steel and manufacturing process thereof | |
| CN104032226B (en) | A kind of non-hardened and tempered steel and production technique thereof | |
| CN109252097A (en) | A kind of non-hardened and tempered steel and its continuous casting manufacturing technique of high intensity fractured connecting rod | |
| JP7457843B2 (en) | Steel plate for polar marine construction and its manufacturing method | |
| CN106086673A (en) | A kind of hot-work die steel plate and preparation method thereof | |
| CN104004960B (en) | A kind of low chromium vanadium titanium cast iron abrading-ball and preparation method thereof | |
| US20160208357A1 (en) | Process for producing non quenched and tempered steel | |
| CN104032224B (en) | A kind of non-hardened and tempered steel and production technique thereof | |
| CN107058897A (en) | A kind of high manganese pre-hardening plastic steel plate for die and its production method | |
| CN109280743B (en) | High-strength wear-resistant steel for roller and production method thereof | |
| CN112695242B (en) | Cogging roll and preparation method thereof | |
| CN101654760A (en) | Unalloyed structural steel S355J2 steel plate and production method thereof | |
| CN104131238A (en) | High-formability high-weatherability ultrathin hot-rolled steel plate and CSP (compact strip production) technology thereof | |
| CN101381803A (en) | Control method of toothed wheel steel band structure | |
| CN104988385B (en) | A kind of not nickeliferous ultra-low temperature surroundings steel plate and preparation method thereof | |
| CN105624540A (en) | Control method of equiaxial crystal ratio of 30CrMo round pipe billet and steel casting blank | |
| CN100366777C (en) | High temperature creep-resisting furnace shell material and its preparation method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150325 |
|
| WD01 | Invention patent application deemed withdrawn after publication |