CN108085601A - A kind of plastic die steel and its production technology - Google Patents
A kind of plastic die steel and its production technology Download PDFInfo
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- CN108085601A CN108085601A CN201711500667.8A CN201711500667A CN108085601A CN 108085601 A CN108085601 A CN 108085601A CN 201711500667 A CN201711500667 A CN 201711500667A CN 108085601 A CN108085601 A CN 108085601A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/02—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
- C21D8/0221—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the working steps
- C21D8/0226—Hot rolling
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- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/0081—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for slabs; for billets
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
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Abstract
The invention belongs to a kind of plastic die steel and its production technologies；The chemical composition of the plastic die steel is calculated as according to mass percent：C：0.37~0.40%, Si：0.4~0.5%, Mn：1.4~1.5%, Cr：1.8~2.0%, Mo：0.4~0.5%, Ni：1.0~1.1%, P≤0.008%, S≤0.003%, Als：0.018~0.030%, remaining is Fe and relict element；The thickness of plastic die steel is 150mm, and carbon equivalent is 1.1~1.3 in the chemical composition of the plastic die steel；Have the advantages that intensity is high, hardness is high and superior performance.
Description
Technical field
The invention belongs to iron and steel smelting technology fields, and in particular to a kind of plastic die steel and its production technology.
Background technology
Plastic die steel is also known as HY718 mould steel, and HY718 mould steel is the trade mark steel of a pre- hard hot die steel
Material, the steel have outstanding mechanical performance and machinability, should in the processing field of die industry particularly plastic mould
With quite extensively.In addition, its special production technology cause HY718 mould steel already have 330 when dispatching from the factory~
The hardness of 370HBW, it is possible to reduce the heat treatment link in the processing of normal mold, increase economic efficiency.Except not
It can be used for outside the plastic mould part of corrosion resistance requirement, be currently the allusion quotation of most widely used general plastic die steel
Shaped steel number.Commonly referred to as " advanced " Plastic Mold Steel, the new steel grade newly developed is often with its typical case as a comparison；
HY718 die steels can further improve surface property through Carburization Treatment.HY718 die steels purposes and P20 types of molds steel
Material is identical, but since quenching degree is more preferable, performance is more superior, can be with big, the high-grade plastic mould formation of parts of manufactured size.
But there is the problem of intensity and relatively not high hardness for existing plastic die steel.
The content of the invention
The defects of it is an object of the invention to overcome in the prior art, provides a kind of high intensity, hardness height and superior performance
Plastic die steel and its production technology.
The object of the present invention is achieved like this：The chemical composition of the plastic die steel is calculated as according to mass percent：
C：0.37~0.40%, Si：0.4~0.5%, Mn：1.4~1.5%, Cr：1.8~2.0%, Mo：0.4~0.5%, Ni：
1.0~1.1%, P≤0.008%, S≤0.003%, Als：0.018~0.030%, remaining is Fe and relict element；The modeling
The thickness of mould steel is expected for 150mm, and carbon equivalent is 1.1~1.3 in the chemical composition of the plastic die steel.
A kind of plastic die steel, the chemical composition of the plastic die steel are calculated as according to mass percent：C：0.38%th, Si：
0.45%th, Mn：1.4%th, Cr：1.9%th, Mo：0.5%th, Ni：1.1%th, P≤0.008%, S≤0.003%, Als：
0.025%, remaining is Fe and relict element；The thickness of the plastic die steel be 150mm, the plastic die steel chemistry into
Carbon equivalent is 1.2 in point.
A kind of production technology of plastic die steel, the production technology include the following steps：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, takes off molten iron after S
Mass percent≤0.003% of middle S；
Step 2：Converter smelting：Enter stove molten iron temperature >=1300 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo is closed
Golden steel scrap and high Ni alloy wasting steels, tapping target contain C >=0.10%, P≤0.015%, S≤0.005% by mass percentage,
Cr：Point blows number and is not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, molten steel is made to be filled with the top of the slag
Divide reaction, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton of lime
Steel dosage is：7.5~10kg, the heating temperature are 1600~1630 DEG C, and the high oxidation iron mixing slag charge includes oxidation
Iron and fluorite, the weight of iron oxide account for the 40~80% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron and mixes
Close the 20~60% of slag charge gross weight；
Step 4：VD applications of vacuum：VD vacuum degrees are necessary≤68Pa, 20~25min of dwell time, the volume of hydrogen in molten steel
Concentration≤1.2PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness >=600mm, ensures compression ratio >=4.0, it is desirable that reach the standard grade guarantor
Warm cap must be toasted, baking time >=4h, 100 DEG C of hot top temperature ＞, 1540~1550 DEG C of pouring molten steel temperature, cast
After 6~8h demould；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to
200~260 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, double after cleaning out
Coat high temperature anti-oxidation coating in face；
Step 7：Heating：4~5h of steel is boiled in a covered pot over a slow fire, so in 400~450 DEG C of furnace temperature during shove charge, steel ingot temperature >=150 DEG C after shove charge
850~900 DEG C are risen to≤60 DEG C/h heating rates, keep the temperature 2h afterwards, finally 1240 are risen to≤150 DEG C/h heating rates~
1260 DEG C, high temperature section soaking time is：H × 7.0~8.0min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature >=1020 DEG C roll last three percentage pass reduction
>=15%, cool steel returns the red time and is between every time：50~60S ensures that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel,
Finishing temperature >=950 DEG C；
Step 9：Heap is cold：It is cold using the offline heap of high temperature clamp, cold temperature >=600 DEG C of heap, steel billet temperature be down to 100 DEG C with
De-stacking when lower；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is pressed
According to t=2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling after tempering is come out of the stove
To less than 100 DEG C, you can.
The present invention takes off S, converter smelting, LF refining, VD applications of vacuum, molding, ingot slow cool, cleaning, painting by KR molten iron
Material, heating, rolling, the hot and cold treatment process of heap make smelting molten steel process employ domestic advanced LF refining and take off P techniques, significantly
Degree reduces P content in steel, and original steel ingot internal defect is improved by VD vacuum outgas, water cooled mo(u)ld placingJi Shu, prevents simultaneously
The generation of H traps is stopped；Slow cooling eliminates the internal stress that solidification generates after the steel ingot demoulding, prevents steel ingot from bursting, clear by full plate
Reason, high temperature anti-oxidation coating ensure that the surface quality for rolling rear steel plate.By improving axial rolling percentage pass reduction during rolling, steel is made up
Ingot initial loose defect improves internal flaw detection quality, meets forging non-destructive testing standard；Pass through composition design, normalizing+tempering, stacking
The heat treatment process of slow cooling ensure that steel plate hardness reaches technical protocol requirement；With intensity height, hardness height and superior performance
Advantage.
Specific embodiment
The present invention is a kind of plastic die steel and its production technology, and the chemical composition of the plastic die steel is according to quality percentage
Than being calculated as：C：0.37~0.40%, Si：0.4~0.5%, Mn：1.4~1.5%, Cr：1.8~2.0%, Mo：0.4~
0.5%th, Ni：1.0~1.1%, P≤0.008%, S≤0.003%, Als：0.018~0.030%, remaining is Fe and residual
Element；The thickness of the plastic die steel is 150mm, and carbon equivalent is 1.1~1.3 in the chemical composition of the plastic die steel.
A kind of plastic die steel, the chemical composition of the plastic die steel are calculated as according to mass percent：C：0.38%th, Si：
0.45%th, Mn：1.4%th, Cr：1.9%th, Mo：0.5%th, Ni：1.1%th, P≤0.008%, S≤0.003%, Als：
0.025%, remaining is Fe and relict element；The thickness of the plastic die steel be 150mm, the plastic die steel chemistry into
Carbon equivalent is 1.2 in point.
A kind of production technology of plastic die steel, the production technology include the following steps：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, takes off molten iron after S
Mass percent≤0.003% of middle S；
Step 2：Converter smelting：Enter stove molten iron temperature >=1300 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo is closed
Golden steel scrap and high Ni alloy wasting steels, tapping target contain C >=0.10%, P≤0.015%, S≤0.005% by mass percentage,
Cr：Point blows number and is not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, molten steel is made to be filled with the top of the slag
Divide reaction, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton of lime
Steel dosage is：7.5~10kg, the heating temperature are 1600~1630 DEG C, and the high oxidation iron mixing slag charge includes oxidation
Iron and fluorite, the weight of iron oxide account for the 40~80% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron and mixes
Close the 20~60% of slag charge gross weight；
Step 4：VD applications of vacuum：VD vacuum degrees are necessary≤68Pa, 20~25min of dwell time, the volume of hydrogen in molten steel
Concentration≤1.2PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness >=600mm, ensures compression ratio >=4.0, it is desirable that reach the standard grade guarantor
Warm cap must be toasted, baking time >=4h, 100 DEG C of hot top temperature ＞, 1540~1550 DEG C of pouring molten steel temperature, cast
After 6~8h demould；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to
200~260 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, double after cleaning out
Coat high temperature anti-oxidation coating in face；
Step 7：Heating：4~5h of steel is boiled in a covered pot over a slow fire, so in 400~450 DEG C of furnace temperature during shove charge, steel ingot temperature >=150 DEG C after shove charge
850~900 DEG C are risen to≤60 DEG C/h heating rates, keep the temperature 2h afterwards, finally 1240 are risen to≤150 DEG C/h heating rates~
1260 DEG C, high temperature section soaking time is：H × 7.0~8.0min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature >=1020 DEG C roll last three percentage pass reduction
>=15%, cool steel returns the red time and is between every time：50~60S ensures that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel,
Finishing temperature >=950 DEG C；
Step 9：Heap is cold：It is cold using the offline heap of high temperature clamp, cold temperature >=600 DEG C of heap, steel billet temperature be down to 100 DEG C with
De-stacking when lower；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is pressed
According to t=2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling after tempering is come out of the stove
To less than 100 DEG C, you can.
High oxidation iron mixing slag charge in the present invention is the product of applicant oneself company production, including iron oxide and firefly
Stone, the weight of iron oxide account for the 40~80% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron mixing slag charge
The 20~60% of gross weight；Heretofore described high temperature anti-oxidation coating can be purchased directly on the market；The step six of the present invention
Described in requirement steel ingot expire plate dress watch, macroscopic crackle is cleaned out；Above-mentioned cleaning measure is to pass through oxygen rifle
High-temperature heating devices is waited to melt macroscopic crackle, and are become one structure with steel ingot.
For the more detailed explanation present invention, the present invention is further elaborated in conjunction with embodiment.Specific embodiment
It is as follows：
Embodiment one
A kind of plastic die steel, chemical composition are calculated as according to mass percent：C：0.37%th, Si：0.4%th, Mn：
1.4%th, Cr：1.8%th, Mo：0.4%th, Ni：1.0%th, P≤0.008%, S≤0.003%, Als：0.018~0.030%,
Remaining is Fe and relict element；The thickness of the plastic die steel is 150mm, carbon equivalent in the chemical composition of the plastic die steel
For 1.1.
A kind of production technology of plastic die steel, the production technology include the following steps：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, takes off molten iron after S
Mass percent≤0.003% of middle S；
Step 2：Converter smelting：Enter stove molten iron temperature >=1300 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo is closed
Golden steel scrap and high Ni alloy wasting steels, tapping target contain C >=0.10%, P≤0.015%, S≤0.005% by mass percentage,
Cr：Point blows number and is not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, molten steel is made to be filled with the top of the slag
Divide reaction, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton of lime
Steel dosage is：7.5kg, the heating temperature are 1600 DEG C, and the high oxidation iron mixing slag charge includes iron oxide and fluorite, oxygen
The weight for changing iron accounts for the 40% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron mixing slag charge gross weight
60%；
Step 4：VD applications of vacuum：VD vacuum degrees are necessary≤68Pa, 20~25min of dwell time, the volume of hydrogen in molten steel
Concentration≤1.2PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness >=600mm, ensures compression ratio >=4.0, it is desirable that reach the standard grade guarantor
Warm cap must be toasted, baking time >=4h, 100 DEG C of hot top temperature ＞, 1540 DEG C of pouring molten steel temperature, after being poured
6h is demoulded；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to
200 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, and cleans out rear two-sided painting
Upper high temperature anti-oxidation coating；
Step 7：Heating：Steel 4~5h is boiled in a covered pot over a slow fire in 400 DEG C of furnace temperature during shove charge, steel ingot temperature >=150 DEG C after shove charge, then with≤
60 DEG C/h heating rates rise to 850~900 DEG C, keep the temperature 2h, finally rise to 1240~1260 DEG C with≤150 DEG C/h heating rates,
High temperature section soaking time is：H × 7.0min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature >=1020 DEG C roll last three percentage pass reduction
>=15%, cool steel returns the red time and is between every time：50S ensures that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel, finish to gauge
Temperature >=950 DEG C；
Step 9：Heap is cold：It is cold using the offline heap of high temperature clamp, cold temperature >=600 DEG C of heap, steel billet temperature be down to 100 DEG C with
De-stacking when lower；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is pressed
According to t=2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling after tempering is come out of the stove
To less than 100 DEG C, you can.
Embodiment two
A kind of plastic die steel, chemical composition are calculated as according to mass percent：C：0.40%th, Si：0.5%th, Mn：
1.5%th, Cr：2.0%th, Mo：0.5%th, Ni：1.1%th, P≤0.008%, S≤0.003%, Als：0.018~0.030%,
Remaining is Fe and relict element；The thickness of the plastic die steel is 150mm, carbon equivalent in the chemical composition of the plastic die steel
For 1.3.
A kind of production technology of plastic die steel, the production technology include the following steps：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, takes off molten iron after S
Mass percent≤0.003% of middle S；
Step 2：Converter smelting：Enter stove molten iron temperature >=1300 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo is closed
Golden steel scrap and high Ni alloy wasting steels, tapping target contain C >=0.10%, P≤0.015%, S≤0.005% by mass percentage,
Cr：Point blows number and is not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, molten steel is made to be filled with the top of the slag
Divide reaction, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton of lime
Steel dosage is：10kg, the heating temperature are 1630 DEG C, and the high oxidation iron mixing slag charge includes iron oxide and fluorite, oxygen
The weight for changing iron accounts for the 20% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron mixing slag charge gross weight
80%；
Step 4：VD applications of vacuum：VD vacuum degrees are necessary≤68Pa, dwell time 25min, the volumetric concentration of hydrogen in molten steel
≤1.2PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness >=600mm, ensures compression ratio >=4.0, it is desirable that reach the standard grade guarantor
Warm cap must be toasted, baking time >=4h, 100 DEG C of hot top temperature ＞, 1550 DEG C of pouring molten steel temperature, after being poured
8h is demoulded；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to
260 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, and cleans out rear two-sided painting
Upper high temperature anti-oxidation coating；
Step 7：Heating：Steel 4~5h is boiled in a covered pot over a slow fire in 450 DEG C of furnace temperature during shove charge, steel ingot temperature >=150 DEG C after shove charge, then with≤
60 DEG C/h heating rates rise to 900 DEG C, keep the temperature 2h, finally rise to 1240~1260 DEG C with≤150 DEG C/h heating rates, high temperature section
Soaking time is：H × 8.0min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature >=1020 DEG C roll last three percentage pass reduction
>=15%, cool steel returns the red time and is between every time：60S ensures that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel, finish to gauge
Temperature >=950 DEG C；
Step 9：Heap is cold：It is cold using the offline heap of high temperature clamp, cold temperature >=600 DEG C of heap, steel billet temperature be down to 100 DEG C with
De-stacking when lower；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is pressed
According to t=2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling after tempering is come out of the stove
To less than 100 DEG C, you can.
Embodiment three
A kind of plastic die steel, chemical composition are calculated as according to mass percent：C：0.385%th, Si：0.45%th, Mn：
1.45%th, Cr：1.9%th, Mo：0.45%th, Ni：1.05%th, P≤0.008%, S≤0.003%, Als：0.018~
0.030%, remaining is Fe and relict element；The thickness of the plastic die steel be 150mm, the plastic die steel chemistry into
Carbon equivalent is 1.2 in point.
A kind of production technology of plastic die steel, the production technology include the following steps：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, takes off molten iron after S
Mass percent≤0.003% of middle S；
Step 2：Converter smelting：Enter stove molten iron temperature >=1300 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo is closed
Golden steel scrap and high Ni alloy wasting steels, tapping target contain C >=0.10%, P≤0.015%, S≤0.005% by mass percentage,
Cr：Point blows number and is not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, molten steel is made to be filled with the top of the slag
Divide reaction, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton of lime
Steel dosage is：8.75kg, the heating temperature are 1615 DEG C, and the high oxidation iron mixing slag charge includes iron oxide and fluorite,
The weight of iron oxide accounts for the 60% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron mixing slag charge gross weight
40%；
Step 4：VD applications of vacuum：VD vacuum degrees are necessary≤68Pa, 20~25min of dwell time, the volume of hydrogen in molten steel
Concentration≤1.2PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness >=600mm, ensures compression ratio >=4.0, it is desirable that reach the standard grade guarantor
Warm cap must be toasted, baking time >=4h, 100 DEG C of hot top temperature ＞, 1545 DEG C of pouring molten steel temperature, after being poured
7h is demoulded；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to
230 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, and cleans out rear two-sided painting
Upper high temperature anti-oxidation coating；
Step 7：Heating：Steel 4.5h is boiled in a covered pot over a slow fire, then with≤60 in 425 DEG C of furnace temperature during shove charge, steel ingot temperature >=150 DEG C after shove charge
DEG C/h heating rates rise to 875 DEG C, 2h is kept the temperature, finally rises to 1240~1260 DEG C with≤150 DEG C/h heating rates, high temperature section
Soaking time is：H × 7.5min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature >=1020 DEG C roll last three percentage pass reduction
>=15%, cool steel returns the red time and is between every time：55S ensures that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel, finish to gauge
Temperature >=950 DEG C；
Step 9：Heap is cold：It is cold using the offline heap of high temperature clamp, cold temperature >=600 DEG C of heap, steel billet temperature be down to 100 DEG C with
De-stacking when lower；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is pressed
According to t=2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling after tempering is come out of the stove
To less than 100 DEG C, you can.
Example IV
A kind of plastic die steel, the chemical composition of the plastic die steel are calculated as according to mass percent：C：0.38%th, Si：
0.45%th, Mn：1.4%th, Cr：1.9%th, Mo：0.5%th, Ni：1.1%th, P≤0.008%, S≤0.003%, Als：
0.025%, remaining is Fe and relict element；The thickness of the plastic die steel be 150mm, the plastic die steel chemistry into
Carbon equivalent is 1.2 in point.
A kind of production technology of plastic die steel, the production technology include the following steps：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, takes off molten iron after S
The mass percent of middle S：0.002%；
Step 2：Converter smelting：Entering stove molten iron temperature is：1330 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo is closed
Golden steel scrap and high Ni alloy wasting steels, tapping target contain C by mass percentage：0.15%th, P：0.012%th, S：0.003%, Cr：
Point blows number and is not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, molten steel is made to be filled with the top of the slag
Divide reaction, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton of lime
Steel dosage is：9kg, the heating temperature are 1610 DEG C, and the high oxidation iron mixing slag charge includes iron oxide and fluorite, oxidation
The weight of iron accounts for the 50% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for the 50% of high oxidation iron mixing slag charge gross weight；
Step 4：VD applications of vacuum：VD vacuum degrees are：67Pa, dwell time 23min, the volumetric concentration of hydrogen is in molten steel：
1.0PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness is：700mm ensures that compression ratio is：4.7, it is desirable that reach the standard grade
Hot top must be toasted, and baking time is：5h, hot top temperature are：150 DEG C, pouring molten steel temperature：154：5 DEG C, cast
After 7h demould；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to
260 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, and cleans out rear two-sided painting
Upper high temperature anti-oxidation coating；
Step 7：Heating：420 DEG C of furnace temperature during shove charge, steel ingot temperature be 160 DEG C, after shove charge boil in a covered pot over a slow fire the steel time be：4h, then
870 DEG C are risen to 50 DEG C/h heating rates, keeps the temperature 2h, finally rises to 1250 DEG C, when high temperature section is kept the temperature with 130 DEG C/h heating rates
Between be：H × 7.5min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature is 1030 DEG C, rolls last three percentage pass reduction
>=15%, cool steel returns the red time and is between every time：60S ensures that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel, finish to gauge
Temperature is 980 DEG C；
Step 9：Heap is cold：Cold using the offline heap of high temperature clamp, the cold temperature of heap is 630 DEG C, when steel billet temperature is down to 80 DEG C
De-stacking；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is pressed
According to t=2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling after tempering is come out of the stove
To less than 100 DEG C, you can.
Experimental example
Mechanical mechanics property analysis is carried out to the plastic die steel prepared in the embodiment of the present invention four to draw the following conclusions：Modeling
Material mould steel thickness be：150mm, the surface to the plastic die steel, center portion carry out HRC hardness tests respectively：Center portion is hard
Degree：HRC31.5-HRC33.2 (protocol requirements：HRC29-HRC34)；Case hardness：HRC32.5-HRC33.8 (protocol requirements：
HRC29-HRC34)。
This batch trial production 150mm thickness plastic die steels amount to 20 batches, wherein：Surface and center portion HRC hardness accord with completely
Conjunction meets client's requirement, centre hardness fluctuation HRC1.7, case hardness fluctuation 1.3HRC.Outer inspection and flaw detection：It is developed
It examines outside steel plate, the percentage of A-class goods 100%, detects a flaw according to JB/T4730 standards, first-time qualification rate 90% of detecting a flaw has reached desired effect.
Moreover, it will be appreciated that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
Using specification as an entirety, the technical solutions in each embodiment can also be properly combined, forms those skilled in the art
It is appreciated that other embodiment.
Claims (3)
1. a kind of plastic die steel, it is characterised in that：The chemical composition of the plastic die steel is calculated as according to mass percent：C：
0.37~0.40%, Si：0.4~0.5%, Mn：1.4~1.5%, Cr：1.8~2.0%, Mo：0.4~0.5%, Ni：1.0~
1.1%th, P≤0.008%, S≤0.003%, Als：0.018~0.030%, remaining is Fe and relict element；The modern designs of plastics
Has the thickness of steel for 150mm, carbon equivalent is 1.1-1.3 in the chemical composition of the plastic die steel.
2. a kind of plastic die steel according to claim 1, it is characterised in that：The chemical composition of the plastic die steel according to
Mass percent is calculated as：C：0.38%th, Si：0.45%th, Mn：1.4%th, Cr：1.9%th, M0：0.5%th, Ni：1.1%th, P≤
0.008%th, S≤0.003%, Als：0.025%, remaining is Fe and relict element；The thickness of the plastic die steel is
150mm, carbon equivalent is 1.2 in the chemical composition of the plastic die steel.
3. a kind of production technology of plastic die steel as described in claim 1-2, it is characterised in that：The production technology is included such as
Lower step：
Step 1：KR molten iron takes off S：The molten iron that arrives at a station carries out taking off Slag treatment, it is desirable that forward and backward slag scratches clean completely, S in molten iron after de- S
Mass percent≤0.003%；
Step 2：Converter smelting：Enter stove molten iron temperature >=1300 DEG C, smelting process adds in high Cr-containing alloy steel scrap, high Mo alloy wastes
Steel and high Ni alloy wasting steels, tapping target is by mass percentage containing C >=0.10%, P≤0.015%, S≤0.005%, Cr：Point
It blows number to be not greater than 2 times, avoids tapping process slag；
Step 3：LF refining：High oxidation iron mixing slag charge and lime are added in, heating temperature is controlled, makes molten steel fully anti-with the top of the slag
Should, finished product P is controlled below 0.003%；The ton steel dosage of the high oxidation iron mixing slag charge is：14kg, the ton steel of lime are used
It measures and is：7.5~10kg, the heating temperature be 1600~1630 DEG C, the high oxidation iron mixing slag charge include iron oxide with
Fluorite, the weight of iron oxide account for the 40~80% of high oxidation iron mixing slag charge gross weight, and the weight of fluorite accounts for high oxidation iron mixing slag
Expect the 20~60% of gross weight；
Step 4：VD applications of vacuum：VD vacuum degrees are necessary≤68Pa, 20~25min of dwell time, the volumetric concentration of hydrogen in molten steel
≤1.2PPm；
Step 5：Molding：It is poured into a mould using water cooled mo(u)ld, ingot thickness >=600mm, ensures compression ratio >=4.0, it is desirable that hot top of reaching the standard grade
It must be toasted, baking time >=4h, 100 DEG C of hot top temperature ＞, 1540~1550 DEG C of pouring molten steel temperature is poured
6~8h is demoulded afterwards；
Step 6：Ingot slow cool, cleaning, coating：Burial pit slow cooling is hung in 1h after steel ingot demoulds, treats that temperature is down to 200
~260 DEG C of ingot conditionings, it is desirable that steel ingot expires plate dress watch, and macroscopic crackle is cleaned out, and cleans out rear two-sided
Coat high temperature anti-oxidation coating；
Step 7：Heating：Steel 4~5h is boiled in a covered pot over a slow fire in 400~450 DEG C of furnace temperature during shove charge, steel ingot temperature >=150 DEG C after shove charge, then with≤
60 DEG C/h heating rates rise to 850~900 DEG C, keep the temperature 2h, finally rise to 1240~1260 DEG C with≤150 DEG C/h heating rates,
High temperature section soaking time is：H × 7.0~8.0min/cm, the H are ingot thickness；
Step 8：Rolling：Using the rolling mode of hot rolling, start rolling temperature >=1020 DEG C, roll last three percentage pass reduction >=
15%, cool steel returns the red time and is between every time：50~605, ensure that steel plate upper and lower surface temperature uniformly avoids rolling from sticking up steel, eventually
Roll temperature >=950 DEG C；
Step 9：Heap is cold：It is cold using the offline heap of high temperature clamp, cold temperature >=600 DEG C of heap, when steel billet temperature is down to less than 100 DEG C
De-stacking；
Step 10：Heat treatment：Using the heat treatment process of normalizing+tempering, 880 ± 10 DEG C of normalizing temperature, heat insulating coefficient is according to t=
2.0min/mm；580 ± 10 DEG C of temperature, heat insulating coefficient is according to t=4.0min/mm；Stacking slow cooling is to 100 after tempering is come out of the stove
Below DEG C, you can.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023125A (en) * | 2018-10-23 | 2018-12-18 | 河南中原特钢装备制造有限公司 | The production technology of low-carbon, high silicon cupric containing aluminium plastic mould steel |
| CN111041347A (en) * | 2019-11-20 | 2020-04-21 | 长沙金铎机械有限公司 | Continuous rolling roller and preparation method thereof |
| CN111575595A (en) * | 2020-07-06 | 2020-08-25 | 朱文清 | Economical hot-press casting die steel and preparation method thereof |
| CN112481546A (en) * | 2020-11-26 | 2021-03-12 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN114427065A (en) * | 2021-12-28 | 2022-05-03 | 南阳汉冶特钢有限公司 | Production method of 250-400mm thick high-quality low-cost plastic mold steel 1.2738 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2017
- 2017-12-22 CN CN201711500667.8A patent/CN108085601A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109023125A (en) * | 2018-10-23 | 2018-12-18 | 河南中原特钢装备制造有限公司 | The production technology of low-carbon, high silicon cupric containing aluminium plastic mould steel |
| CN111041347A (en) * | 2019-11-20 | 2020-04-21 | 长沙金铎机械有限公司 | Continuous rolling roller and preparation method thereof |
| CN111575595A (en) * | 2020-07-06 | 2020-08-25 | 朱文清 | Economical hot-press casting die steel and preparation method thereof |
| CN112481546A (en) * | 2020-11-26 | 2021-03-12 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN112481546B (en) * | 2020-11-26 | 2022-06-14 | 南阳汉冶特钢有限公司 | Production method of steel plate P20 for extra-thick plastic mold |
| CN114427065A (en) * | 2021-12-28 | 2022-05-03 | 南阳汉冶特钢有限公司 | Production method of 250-400mm thick high-quality low-cost plastic mold steel 1.2738 |
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