CN108690935B - A kind of high-quality alloy tool steel plate and production method - Google Patents
A kind of high-quality alloy tool steel plate and production method Download PDFInfo
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- CN108690935B CN108690935B CN201810595000.9A CN201810595000A CN108690935B CN 108690935 B CN108690935 B CN 108690935B CN 201810595000 A CN201810595000 A CN 201810595000A CN 108690935 B CN108690935 B CN 108690935B
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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
- C21D8/0205—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips of ferrous alloys
-
- 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
-
- 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
- C21D8/0247—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment
-
- 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
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
-
- 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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/22—Ferrous alloys, e.g. steel alloys containing chromium with molybdenum or tungsten
Abstract
The invention discloses a kind of high-quality alloy tool steel plate and production method, the chemical components of steel are as follows: C 1.00%-1.20%, Si1.00%-1.20%, Mn0.60%-1.00%, Cr0.90%-1.40%, W 1.00%-1.60%, P < 0.02%, S < 0.01%.Steel billet is heated, and the first stage is heated to 600-650 DEG C, and second stage is heated to 1100-1200 DEG C；1050-1100 DEG C of start rolling temperature, finishing temperature is greater than 900 DEG C, is cooled to 400 DEG C or less with the speed not less than 3 DEG C/s；830-890 DEG C of hardening heat, 550-650 DEG C of first stage heating temperature；830-890 DEG C of second stage heating temperature；It is tempered immediately after the completion of steel plate quenching, 140-200 DEG C of tempering temperature.Steel plate yield strength 850MPa or more, 12.0% or more elongation after fracture, steel plate ballistic work 95J or more, the maximum gauge that can produce steel plate reach 50mm.
Description
Technical field
The invention belongs to metal material production technical field, it is related specifically to a kind of high-quality alloy tool steel plate and production
Method.
Background technique
Tool steel has the performances such as good intensity, toughness, hardness, wearability and temper resistance, by widely to
Cutting tool, measurer, mold and wear resistant tools are manufactured, and annual requirement is larger.But with domestic high-end equipment and manufacturing industry
Development, existing conventional variety is often unable to satisfy to the gradually harsh requirement of steel grade performance, therefore needs exploitation high-quality
Alloy tool steel meets requirement, and high-quality alloy tool steel carbon content is generally higher than 0.5%, the alloying elements such as Si, Cr
Content it is higher, and the requirement to its quality is also very high, therefore has very big production difficulty.
Currently, following deficiency is primarily present in terms of producing high-quality alloy tool steel plate, and 1) production technology complexity, such as name
For the patent of " a kind of alloy tool steel and its production method ", application number: 201510687941.1, which disclose a kind of conjunctions
Golden same tool steel plate and its production method, chemical component are as follows: C 0.5%, Si 0.2%, Mn 0.5%, Cr 5.0%, Mo
2.3%, V 0.5%, S≤0.003%, P≤0.02%.Compared with existing tool steel, there is higher hardness, excellent toughness,
Ductility, wearability.But its production technology includes: vacuum induction melting-casting electrode bar-electroslag remelting-forging and stamping-heat treatment
Etc. processes, complex technical process.2) performance of steel plate is poor, and such as entitled " high-quality thin gauge hot rolled alloy tool steel and its CSP are raw
The patent of production. art ", application number: 201610827777.4, which disclose a kind of high-quality thin gauge hot rolled alloy tools
Steel and its CSP production technology, chemical component are as follows: C 0.85~0.95%, Si 1.25~1.45%, Mn 0.4~0.55%, Cr
1.05~1.15%, Als 0.015~0.035%, P 0~0.015%, S 0~0.005%, N 0~0.006%.Its steel plate
Yield strength 780MPa or more, tensile strength 1200MPa or more, but its elongation percentage maximum is only about 8.0%, influences final
The use of product.3) finished steel plate thickness is small, the patent as described in 2), and according to technique disclosed in it, the maximum for producing steel plate is thick
Degree is only about 2mm, is not able to satisfy the demand of high-quality alloy tool steel.Entitled " the producer of high carbon tool steel hot rolled steel sheet
The patent of method ", application number: 201610583801.4, according to technique disclosed in it, the steel plate maximum gauge of production is also only about
3mm is not able to satisfy the demand of high-quality alloy tool steel plate equally.
Summary of the invention
The purpose of the present invention is to provide a kind of high-quality alloy tool steel plate and production methods, by rationally designing alloy
The chemical component of tool steel, and matched production technology is designed, improve the performance of steel plate.
To achieve the above object, the present invention adopts the following technical scheme that.
The chemical component of a kind of high-quality alloy tool steel plate of the invention, according to weight percent are as follows: C:1.00%-
1.20%, Si:1.00%-1.20%, Mn:0.60%-1.00%, Cr:0.90%-1.40%, W:1.00%-1.60%, P <
0.02%, S < 0.01%, surplus are Fe and inevitable impurity.
Further, the steel plate thickness is 10~50mm.
The effect of each chemical component of the present invention is described in detail below.
C: in tool steel, carbon is indispensable element, and content is higher.One side carbon is effective solid in steel
On the other hand molten intensified element can form various carbide, in tool steel, it is ensured that sufficient carbide content is to protect
Demonstrate,prove its intensity and wearability.But when excessively high the toughness of steel can reduce carbon content, right especially when forming coarse eutectic carbide
The influence of toughness is more serious.The present invention selects that range is added to be 1.00%-1.20%.
Si: the deoxidant element of steelmaking process has stronger solid solution strengthening effect in steel, and too high levels can then reduce steel
Toughness.The present invention selects that range is added to be 1.00%-1.20%.
Mn: suitable Mn can delay steel grade ferrite and pearlite to change, and increase steel grade harden ability, and it is tough to improve impact
Property.The present invention selects that range is added to be 0.60%-1.00%.
Cr: chromium is common alloying element in mould steel, all contains elemental chromium in almost all of alloy die steel.Chromium
The harden ability of steel can be increased, improve temper resistance, and generate post-curing phenomenon；Chromium is middle carbide,
Carbide can be formed with carbon in steel, also dissolves in solid solution and Fe3C, increases the intensity and wearability of steel；But works as and contain
When measuring excessively high, excessive ledeburite eutectic and bulk carbide easy to form.The present invention selects that range is added to be 0.90%-
1.40%.
W: tungsten can refine crystal grain, STABILITY OF MARTENSITE be improved, to greatly improve the harden ability of steel plate；Prevent Temper brittleness
Sexual development can not reduce plasticity while improving armor plate strength；Tungsten is carbide, carbide and its steady
It is fixed, high temperature also indissoluble into solid solution.But the reduction of hot processing temperature range can be made when too high levels.The present invention selects that range is added
For 1.00%-1.60%.
P: phosphorus forms microsegregation in solidification of molten steel, then makes when austenitizing temperature is heated in grain boundaries segregation
The toughness of steel reduces, and brittleness increases.The present invention controls the content of phosphorus less than 0.02%, and the lower content the better.
S: harmful element makes steel generate red brittleness, reduces the ductility and toughness of steel, cause to split in forging or rolling
Line.The present invention controls the content of sulphur less than 0.01%, and the lower content the better.
Concrete technology method of the present invention are as follows: including smelting, casting, heating stove heating, rolling, heat treatment.Specific steps are such as
Under:
1) it is smelted according to the mentioned component of steel, the molten steel completed will be smelted and be cast into steel billet.
2) 1) gained steel billet is heated in heating furnace, heating process carries out in two stages, and the first stage is heated to
600-650 DEG C, 7-9 DEG C of heating rate/min, soaking time 1-2h, second stage is heated to 1100-1200 DEG C, heating rate
12-14 DEG C/min, soaking time 2-4h.
3) steel billet that heating is completed is rolled, 1050-1100 DEG C of start rolling temperature, the first percentage pass reduction of control is less than
20%, total reduction is greater than 80%, and steel plate finishing temperature is greater than 900 DEG C, and steel plate rolling is after the completion with the speed not less than 3 DEG C/s
400 DEG C are cooled to hereinafter, being then air-cooled to room temperature.
4) steel plate that rolling is completed being heat-treated, heat treatment process is as follows, it a) quenches, 830-890 DEG C of hardening heat,
Quench heating technique heats in two stages, and first stage heating temperature is 550-650 DEG C, 5-6 DEG C of heating rate/min, when heat preservation
Between 1.5-3.0min/mm；Second stage heating temperature is 830-890 DEG C, 10-15 DEG C of heating rate/min, soaking time 3.0-
5.0min/mm.Steel plate is quenched after the completion of heating, quenching mode is cold using water cooling or oil；B) it is tempered, steel plate quenching is completed
It is tempered immediately afterwards, 140-200 DEG C of tempering temperature, soaking time 2-5min/mm.
The present invention designs matched production technology by rationally designing the chemical component of alloy tool steel, mentions
The performance of high steel plate finally obtains a kind of with high-intensitive, high tenacity high-quality alloy tool steel plate, yield strength 850MPa
More than, 12.0% or more elongation after fracture, steel plate ballistic work 95J or more can produce the maximum gauge of steel plate up to 50mm.
Specific embodiment
Following embodiment is only some optimal embodiments of the invention, is not had to aforementioned invention range and technological means
Any restrictions.
Chemical composition ranges designed according to this invention are smelted, and specific chemical composition is as shown in table 1.
The chemical component (wt%) of 1 embodiment of the present invention of table
The steel of chemical component shown in table 1 is smelted, is cast for steel billet, steel billet is put into heating furnace and is heated,
Heating process is as shown in table 2.
2 heating steel billet technique of table
The steel billet that heating is completed is rolled, the rolling mill practice of steel plate is as shown in table 3.
3 steel plate rolling technique of table
Steel plate is heat-treated, quenching mode uses water cooling, and heat treatment process is as shown in table 4.
4 steel plate heat treatment process of table
It tests after heat treatment to plate property, the results are shown in Table 5.
5 mechanical property of steel plate inspection result of table
Claims (2)
1. a kind of high-quality alloy tool steel plate, which is characterized in that the chemical component of steel is according to weight percent are as follows: C:
1.00%-1.20%, Si:1.00%-1.20%, Mn:0.60%-1.00%, Cr:0.90%-1.40%, W:1.00%-
1.60%, P < 0.02%, S < 0.01%, surplus are Fe and inevitable impurity；The production method of steel plate, including smelting, casting,
Heat stove heating, rolling, heat treatment, the specific steps are as follows:
1) it is smelted according to the mentioned component of steel, the molten steel completed will be smelted and be cast into steel billet；
2) steel billet obtained by step 1) is heated in heating furnace, heating process carries out in two stages, and the first stage is heated to
600-650 DEG C, 7-9 DEG C of heating rate/min, soaking time 1-2h, second stage is heated to 1100-1200 DEG C, heating rate
12-14 DEG C/min, soaking time 2-4h；
3) steel billet that heating is completed is rolled, 1050-1100 DEG C of start rolling temperature, the first percentage pass reduction of control is less than
20%, total reduction is greater than 80%, and steel plate finishing temperature is greater than 900 DEG C, and steel plate rolling is after the completion with the speed not less than 3 DEG C/s
400 DEG C are cooled to hereinafter, being then air-cooled to room temperature；
4) steel plate that rolling is completed is heat-treated, heat treatment process is as follows, a) quenches, 830-890 DEG C of hardening heat, quenching
Heating process heats in two stages, and first stage heating temperature is 550-650 DEG C, 5-6 DEG C of heating rate/min, soaking time
1.5-3.0min/mm；Second stage heating temperature is 830-890 DEG C, 10-15 DEG C of heating rate/min, soaking time 3.0-
5.0min/mm；Steel plate is quenched after the completion of heating, quenching mode is cold using water cooling or oil；B) it is tempered, steel plate quenching is completed
It is tempered immediately afterwards, 140-200 DEG C of tempering temperature, soaking time 2-5min/mm.
2. a kind of high-quality alloy tool steel plate according to claim 1, it is characterised in that: steel plate thickness be 10~
50mm。
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| CN201810595000.9A CN108690935B (en) | 2018-06-11 | 2018-06-11 | A kind of high-quality alloy tool steel plate and production method |
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| CN201810595000.9A CN108690935B (en) | 2018-06-11 | 2018-06-11 | A kind of high-quality alloy tool steel plate and production method |
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| CN108690935A CN108690935A (en) | 2018-10-23 |
| CN108690935B true CN108690935B (en) | 2019-08-06 |
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| JPS60208457A (en) * | 1984-03-30 | 1985-10-21 | Daido Steel Co Ltd | Alloy tool steel |
| WO2007119721A1 (en) * | 2006-04-11 | 2007-10-25 | Hitachi Metals, Ltd. | Method of pretreatment for quenching of martensitic tool steel and method of quenching |
| CN101250667A (en) * | 2008-04-03 | 2008-08-27 | 上海交通大学 | General cold work tool steel |
| CN105779898B (en) * | 2014-12-23 | 2017-10-27 | 鞍钢股份有限公司 | A kind of cold work die steel plate and its manufacture method |
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