CN109609834A - A kind of enhanced mould steel and preparation method thereof - Google Patents

A kind of enhanced mould steel and preparation method thereof Download PDF

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Publication number
CN109609834A
CN109609834A CN201910108389.4A CN201910108389A CN109609834A CN 109609834 A CN109609834 A CN 109609834A CN 201910108389 A CN201910108389 A CN 201910108389A CN 109609834 A CN109609834 A CN 109609834A
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China
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mould steel
steel
preparation
cac
cao
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CN201910108389.4A
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Chinese (zh)
Inventor
栾道成
陈宝书
胡志华
王正云
左城铭
李缘
孙建国
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Xihua University
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Xihua University
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Priority to CN201910108389.4A priority Critical patent/CN109609834A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • 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
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/18—Hardening; Quenching with or without subsequent tempering
    • 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
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • 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
    • 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
    • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
    • 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
    • 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
    • C22C38/24—Ferrous alloys, e.g. steel alloys containing chromium with vanadium

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Steel (AREA)

Abstract

The invention discloses a kind of enhanced mould steel and preparation method thereof.The mould steel includes following components in percentage by weight: 0.8~1.5%C, 1.0~2.0%Si, 4.5~5%Cr, 0.5~1.0%Mn, 0.2~0.6%Mo, 0.02~0.1%Al, 0~0.05%CaO, 0.02~0.08%CaC2, surplus Fe；Preparation method are as follows: (1) mix C, Si, Cr, Mn, Al and Mo by formula, the heating melting under atmosphere of inert gases is then sprayed into CaO and CaC2, continue to melt, collect molten steel；(2) molten steel is poured into member, heated, then heat up；(3) step (2) products therefrom is forged, quenching and tempering.The mould steel that the present invention is prepared, inclusion content is low, toughness, and the performances such as impact strength are obviously improved.

Description

A kind of enhanced mould steel and preparation method thereof
Technical field
The invention belongs to mould steel preparation technical fields, and in particular to a kind of enhanced mould steel and preparation method thereof.
Background technique
China is to produce the maximum country of steel in the world, and 2015 produce about 800,000,000 tons of steel per year, exports 1.1 hundred million tons of steel, but in height Still and in the world there are larger gaps, many special materials must rely on import for advanced country in the steel material production technology of end, The 3900000 tons of high-end special materials of import in 2015, wherein about 200,000 tons of mould steel, are worth about 20,000,000,000 yuans.
Mold is the mother of industrial manufacture, and 60% industrial goods need to produce various products using mold, 2015 Year, the Die Industry output value was more than 2,000,000,000,000 yuans.Various mould steel are consumed every year ten thousand tons about more than 1000.Various high-end industry Product manufactures mold using high-performance mould steel largely to improve the outer Guan of product, precision, the performances such as service life.
High-performance mould steel is broadly divided into high performance hot-work die steel, high performance precision plastic die steel, high-performance cold-working Mould steel, these mould steel are widely used in machine-building, auto parts and components manufacture, the various components of the industries such as electronic apparatus Manufacture, typical feature are exactly that the components precision of the production of the mold manufactured by these materials is high, high-quality, die life It is long.Since high-performance mould steel technical requirement is very high, there is a very high technical threshold, and the mold that domestic production is prepared Its performance of steel is unable to reach using standard, this great market is captured by the product of external advanced enterprises always for a long time, Import must be relied on there are about 200,000 tons or more of high-end mold materials every year, about 20,000,000,000 yuan of the output value, to guarantee domestic high-end manufacture The mold materials of industry are supplied.
Summary of the invention
For above-mentioned deficiency in the prior art, the present invention provides a kind of enhanced mould steel and preparation method thereof, can have Effect solves the problems, such as that mold Steel Properties are insufficient.
To achieve the above object, the technical solution adopted by the present invention to solve the technical problems is:
A kind of enhanced mould steel, including following components in percentage by weight:
0.8~1.5%C, 1.0~2.0%Si, 4.5~5%Cr, 0.5~1.0%Mn, 0.2~0.6%Mo, 0.02~ 0.1%Al, 0~0.05%CaO, 0.02~0.08%CaC2, surplus Fe.
Further, including following components in percentage by weight:
0.8%C, 1.0%Si, 5%Cr, 1.0%Mn, 0.4%Mo, 0.08%Al, 0.02%CaO, 0.02%CaC2, remaining Amount is Fe.
Further, further include 0.4~1.0% V.
Further, comprising the following steps:
(1) C, Si, Cr, Mn, Al, V and Mo are mixed by formula, 1500~2000 DEG C heated under atmosphere of inert gases it is molten Melt, is then sprayed into CaO and CaC2, continue 3~5h of melting, remove float and on upper layer substance, collect molten steel；
(2) under conditions of 10~15MPa, molten steel is poured into member, then 800~900 DEG C of 1~3h of heating, then with 100 The speed of~200 DEG C/h is warming up to 1000~1500 DEG C, and keeps the temperature 1~2h；
(3) step (2) products therefrom is placed in 1000~1200 DEG C of 1~2h of forging, then 800~900 DEG C of quenchings, 150 ~300 DEG C of temperings.
Further, heating rate is 120~180 DEG C/h in step (2).
Further, heating rate is 140 DEG C/h.
Further, hardening heat is 860 DEG C in step (3).
Further, tempering temperature is 160 DEG C in step (3).
The invention has the benefit that
1, the proportion of chemical component of the present invention is more reasonable, and the content for reducing carbon and chromium makes the microstructure segregation of steel Situation arrives very big improvement, so that the performance indicators such as the bending strength of high-strength toughness cold working die steel, net carbide It improves.
2, the content of the molybdenum in this programme formula and vanadium can guarantee that the content of C in mould steel matrix is unlikely to too low, lead It causes the strength of materials to reduce, and group can be made to be woven with more proeutectoid carbide disperse educt, and make to keep enough strong in martensite Degree.
3, by the Cr and Si of weight ratio in addition inventive formulation, it is able to ascend the oxidation film for the mould steel being prepared Compactness, improve its inoxidizability, meanwhile, the additional amount of 4.5~5%Cr can also improve the resistance to tempering of steel, in addition, silicon Decomposition of the steel in the drawing process after martensite transfor mation can further be prevented, can be improved the bending strength of steel after quenching and Impact property.
4, the calcium oxide in formula can form calcium aluminate salt, can effectively drop to aluminium oxide affinity with higher The content of aluminium oxide in low molten steel, and calcium carbide then further can carry out deoxidization desulfuration, and matching in inert atmosphere to molten steel It is melted under conjunction, the inclusion content in molten steel is enabled to minimize, the property such as intensity of mould steel are effectively guaranteed Energy.
5, steel of the present invention is quenched by 800~900 DEG C, and after 150~300 DEG C of tempering heat treatments, impact flexibility is substantially mentioned It rises, under identical hardness situation, impact flexibility improves 1~2 times.
Specific embodiment
A specific embodiment of the invention is described below, in order to facilitate understanding by those skilled in the art this hair It is bright, it should be apparent that the present invention is not limited to the ranges of specific embodiment, for those skilled in the art, As long as various change is in the spirit and scope of the present invention that the attached claims limit and determine, these variations are aobvious and easy See, all are using the innovation and creation of present inventive concept in the column of protection.
Embodiment 1
A kind of enhanced mould steel, including following components in percentage by weight:
0.8%C, 1.0%Si, 5%Cr, 1.0%Mn, 0.4%Mo, 0.08%Al, 0.02%CaO, 0.5%V, 0.02% CaC2, surplus Fe.
The preparation method of above-mentioned enhanced mould steel, comprising the following steps:
(1) C, Si, Cr, Mn, Al, V and Mo are mixed by formula, 1500~2000 DEG C of heating meltings under argon atmosphere, It is then sprayed into CaO and CaC2, continue melt 3h, remove float and on upper layer substance, collect molten steel；
(2) under conditions of 10MPa, molten steel is poured into member, then 900 DEG C of heating 3h, then with the speed liter of 140 DEG C/h Temperature keeps the temperature 1h to 1300 DEG C；
(3) step (2) products therefrom is placed in 1000 DEG C of forging 1h, then 860 DEG C of quenchings, 160 DEG C of temperings.
It examines by the A method of GB/T10561-2005 and tests with grading to the mould steel field trash being prepared, wherein A class (sulfide-based) is mingled with thin system, thick system is 0.5 grade；It is 1.0 grades that B class (alumina type), which is mingled with thin system, and thick system is 0.5 grade； D class (the spherical class of individual particle) is mingled with thin system, thick system is 0.5 grade.
Embodiment 2
A kind of enhanced mould steel, including following components in percentage by weight:
0.8%C, 1.0%Si, 4.5%Cr, 0.5%Mn, 0.2%Mo, 0.02%Al, 0.02%CaC2, surplus Fe.
The preparation method of above-mentioned enhanced mould steel, comprising the following steps:
(1) C, Si, Cr, Mn, Al and Mo are mixed by formula, 1500 DEG C of heating meltings under argon gas are then sprayed into CaC2, Continue melt 5h, remove float and on upper layer substance, collect molten steel；
(2) under conditions of 15MPa, molten steel is poured into member, then 800 DEG C of heating 1h, then with the speed liter of 100 DEG C/h Temperature keeps the temperature 2h to 1500 DEG C；
(3) step (2) products therefrom is placed in 1200 DEG C of forging 2h, then 900 DEG C of quenchings, 300 DEG C of temperings.
It examines by the A method of GB/T10561-2005 and tests with grading to the mould steel field trash being prepared, wherein A class (sulfide-based) is mingled with that thin system is 1.5, thick system is 1.5 grades；B class (alumina type) is mingled with that thin system is 1.5, thick system is 1.0 Grade；D class (the spherical class of individual particle) is mingled with thin system, thick system is 0.5 grade.
Embodiment 3
A kind of enhanced mould steel, including following components in percentage by weight:
1.5%C, 1.0%Si, 5%Cr, 1.0%Mn, 0.4%Mo, 0.1%Al, 0.05%CaO, 0.08%CaC2, remaining Amount is Fe.
The preparation method of above-mentioned enhanced mould steel, comprising the following steps:
(1) C, Si, Cr, Mn, Al and Mo are mixed by formula, 2000 DEG C of heating meltings under atmosphere of inert gases, then Spray into CaO and CaC2, continue melt 3h, remove float and on upper layer substance, collect molten steel；
(2) under conditions of 12MPa, molten steel is poured into member, then 900 DEG C of 1~3h of heating, then with the speed of 200 DEG C/h Degree is warming up to 1500 DEG C, and keeps the temperature 2h；
(3) step (2) products therefrom is placed in 1200 DEG C of forging 2h, then 900 DEG C of quenchings, 300 DEG C of temperings.
It examines by the A method of GB/T10561-2005 and tests with grading to the mould steel field trash being prepared, wherein A class (sulfide-based) is mingled with thin system, thick system is 1.0 grades；It is 1.0 grades that B class (alumina type), which is mingled with thin system, and thick system is 1.0 grades； D class (the spherical class of individual particle) is mingled with thin system, thick system is 0.5 grade.
Comparative example 1
Compared with Example 1, Cr and CaO is lacked in formula, remaining is same as Example 1.
It examines by the A method of GB/T10561-2005 and tests with grading to the mould steel field trash being prepared, wherein A class (sulfide-based) is mingled with thin system, thick system is 1.5 grades；It is 1.5 grades that B class (alumina type), which is mingled with thin system, and thick system is 1.0 grades； D class (the spherical class of individual particle) is mingled with thin system, thick system is 0.5 grade.Comparative example 2
Compared with Example 1, lack CaC in formula2, remaining is same as Example 1.
It examines by the A method of GB/T10561-2005 and tests with grading to the mould steel field trash being prepared, wherein A class (sulfide-based) is mingled with thin system, thick system is 1.0 grades；It is 1.0 grades that B class (alumina type), which is mingled with thin system, and thick system is 1.5 grades； D class (the spherical class of individual particle) is mingled with thin system, thick system is 0.5 grade.Comparative example 3
Compared with Example 1, lack Cr, Si, CaO and CaC in formula2, remaining is same as Example 1.
It examines by the A method of GB/T10561-2005 and tests with grading to the mould steel field trash being prepared, wherein A class (sulfide-based) is mingled with thin system, thick system is 2.0 grades；It is 1.5 grades that B class (alumina type), which is mingled with thin system, and thick system is 1.5 grades； D class (the spherical class of individual particle) is mingled with thin system, thick system is 1.0 grades.Detection
The performance for the mould steel being prepared in Examples 1 to 3 and comparative example 1~3 is detected according to GB/T 1299-2014, The result is shown in tables 1.
1 mould steel performance parameter of table
Bending strength (MPa) Tensile strength (MPa) Shock resistance value (J)
Embodiment 1 1400 1650 89
Embodiment 2 1300 1500 80
Embodiment 3 1380 1600 87
Comparative example 1 1200 1400 74
Comparative example 2 1300 1500 70
Comparative example 3 820 1040 57
In conclusion the performance for the mould steel that the embodiment of the present invention 1~3 is prepared is substantially better than comparative example 1~3, In be with embodiment 1 especially it is best, show just be prepared with Optimality only under the cooperation of the method for the present invention and formula The mould steel of energy.

Claims (8)

1. a kind of enhanced mould steel, which is characterized in that including following components in percentage by weight:
0.8~1.5%C, 1.0~2.0%Si, 4.5~5%Cr, 0.5~1.0%Mn, 0.2~0.6%Mo, 0.02~0.1% Al, 0~0.05%CaO, 0.02~0.08%CaC2, surplus Fe.
2. enhanced mould steel according to claim 1, which is characterized in that including following components in percentage by weight:
0.8%C, 1.0%Si, 5%Cr, 1.0%Mn, 0.4%Mo, 0.08%Al, 0.02%CaO, 0.02%CaC2, surplus is Fe。
3. enhanced mould steel according to claim 1 or 2, which is characterized in that further include 0.4~1.0% V.
4. the preparation method of enhanced mould steel described in claim 3, which comprises the following steps:
(1) C, Si, Cr, Mn, Al and Mo are mixed by formula, 1500~2000 DEG C of heating meltings under atmosphere of inert gases, so CaO and CaC is sprayed into afterwards2, continue 3~5h of melting, collect molten steel；
(2) under conditions of 10~15MPa, molten steel is poured into member, then 800~900 DEG C of 1~3h of heating, then with 100~ The speed of 200 DEG C/h is warming up to 1000~1500 DEG C, and keeps the temperature 1~2h；
(3) step (2) products therefrom is placed in 1000~1200 DEG C of 1~2h of forging, then 800~900 DEG C of quenchings, 150~300 DEG C tempering.
5. the preparation method according to claim 4, which is characterized in that heating rate described in step (2) is 120~180 ℃/h。
6. preparation method according to claim 5, which is characterized in that the heating rate is 140 DEG C/h.
7. the preparation method according to claim 4, which is characterized in that hardening heat described in step (3) is 860 DEG C.
8. the preparation method according to claim 4, which is characterized in that tempering temperature described in step (3) is 160 DEG C.
CN201910108389.4A 2019-01-18 2019-01-18 A kind of enhanced mould steel and preparation method thereof Pending CN109609834A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003096538A (en) * 2001-09-21 2003-04-03 Sanyo Special Steel Co Ltd Die-use steel having excellent wear resistance
CN103334061A (en) * 2013-06-18 2013-10-02 上海大学 Die-casting die steel with high heat conductivity and large section and preparation and heat treatment method thereof
CN104561802A (en) * 2015-01-23 2015-04-29 宝钢特钢有限公司 High-hardness high-toughness cold work die steel as well as preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003096538A (en) * 2001-09-21 2003-04-03 Sanyo Special Steel Co Ltd Die-use steel having excellent wear resistance
CN103334061A (en) * 2013-06-18 2013-10-02 上海大学 Die-casting die steel with high heat conductivity and large section and preparation and heat treatment method thereof
CN104561802A (en) * 2015-01-23 2015-04-29 宝钢特钢有限公司 High-hardness high-toughness cold work die steel as well as preparation method thereof

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Application publication date: 20190412