CN107779773A - A kind of new non-quenching and tempering plastic mold steel steel plate and preparation method thereof - Google Patents
A kind of new non-quenching and tempering plastic mold steel steel plate and preparation method thereof Download PDFInfo
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- CN107779773A CN107779773A CN201610728829.2A CN201610728829A CN107779773A CN 107779773 A CN107779773 A CN 107779773A CN 201610728829 A CN201610728829 A CN 201610728829A CN 107779773 A CN107779773 A CN 107779773A
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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
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
-
- 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
- C21D8/0263—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips characterised by the heat treatment following hot rolling
-
- 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
- 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
- C22C38/12—Ferrous alloys, e.g. steel alloys containing tungsten, tantalum, molybdenum, vanadium, or niobium
Abstract
The present invention provides a kind of new non-quenching and tempering plastic mold steel steel plate and preparation method thereof, and the composition of the steel plate is as follows by weight percentage：0.35% 0.40% C；0.52 0.56% Si；1.7% 1.9% Mn；≤ 0.010% P；≤ 0.005% S；2.0% 2.3% Cr；0.04% 0.06% Nb；Surplus is Fe and inevitable impurity；Preparation method：1200~1220 DEG C of slab heating temperature；Start rolling temperature is not less than 1100 DEG C, 890~930 DEG C of finishing temperature；It is air-cooled to 200~300 DEG C after rolling, 550~580 DEG C of temperature, net 1.5~2.0min/mm of soaking time.By optimizing composition design, coordinate hot rolling and tempering process, the shortcomings that overcoming plastic die steel hardening flaw sensitiveness high, while reached pre-hardening effect, reduce energy consumption.
Description
Technical field
The invention belongs to ferrous material field, more particularly to non-quenching and tempering plastic mold steel steel plate and its preparation technology.
Background technology
It is molded into and produces the high plastic product of complex-shaped, surfacing, dimension precision requirement in enormous quantities and provide one kind
The production method of high-efficiency and economic, recently as the requirement of automotive light weight technology, and the industry such as household electrical appliance, electronics
Flourish, moulding uses more and more in auto industry and household electrical appliances, communications manufacturing.Injection mould is due to the production cycle
Length, investment is big, the accuracy of manufacture is high, involves great expense, the long-term production and operation causes die casting producer focuses on emphasis to obtain
Obtain on longer die life, i.e., " mould risk control ".So-called " mould risk ", refer to mold design, base mould material choosing
During purchase and heat treatment, Making mold, use, the problem as present in each link triggers risk caused by loss.And mould
The quality for having steel is to resist the precondition and guarantee of " mould risk ".Practice have shown that the section hardness uniformity pair of plastic die steel
The yields of moulding and die life have a major impact.Generally, to avoid mould in heat treatment process from deforming and produce
Crackle, plastic mould will generally carry out Pre-hardening treatment before die sinking, make it have higher stability and well hard
Spend uniformity.
The presently disclosed plastic die steel invention with good organization and uniformity of hardness is more.From composition, hair
Bright CN101002638A, CN101792886A, CN102286698A etc., contain 0.2%~1.5% different content in its composition
Mo or Ni, in terms of the market price, adding 0.2% Mo only cost of alloy just needs 360 yuan/ton, is generally lost in steel industry
Under the Market Situation of damage, 360 yuan of ton steel profit is made a profit instead of suffering a loss for iron and steel enterprise to have important practical significance.Technique side
Face, in the patent of existing plastic die steel steel plate at present or existing product, a part uses molding+quenched production, such as
Invent CN102899571A, CN102312168A；A part uses forging technology, such as invents CN102286698A,
CN102198504A, CN102650021A；A part uses controlled rolling and controlled cooling, such as invents CN102268599A, CN103981447A,
CN103757544A, CN101760701A；Some uses the method for heat-treated offline, such as invents CN103710625A,
Be tempered using 850~900 DEG C of normalizing+400~600 DEG C, invent CN103981451A, using 890~910 DEG C of quenchings+500~
530 DEG C of tempering.
When being handled using hardening and tempering process, steel plate different-thickness section cooling rate difference causes hardness uneven, and quenched
The journey middle section temperature difference produces internal stress, increase hardening break tendency.In addition, molding, forging, controlled rolling and controlled cooling and offline modifier treatment
The shortcomings of more production link, cycle length, low production efficiency, cost are unmanageable all be present etc. technique.For such case, from conjunction
Set about in terms of golden composition design, develop Micro Alloying, low cost and the uniform plastic die steel of section hardness, turn into current mould
The important topic of steel manufacturing enterprise.
The content of the invention
A kind of new non-quenching and tempering plastic mold steel steel plate is provided it is an object of the invention to overcome above mentioned problem and deficiency
And preparation method thereof, by optimizing chemical composition, being refined using LF+RH, calcification processing, whole process protection pour into a mould, high temperature low speed it is big
The multiple technologies means such as pressure rolling, rolling temperature control and roller repairing technique, it can be ensured that the hardness number of steel plate meets
P20 hardness requirements in AISI standards, without by modifier treatment, reducing energy consumption, saving enterprise's production cost.
The object of the present invention is achieved like this：
A kind of new non-quenching and tempering plastic mold steel steel plate, the composition of the steel plate are as follows by weight percentage：0.35%-
0.40% C；0.52-0.56% Si；1.7%-1.9% Mn；≤ 0.010% P；≤ 0.005% S；2.0%-
2.3% Cr；0.04%-0.06% Nb；Surplus is Fe and inevitable impurity.
Present component design reason is as follows：
(1)C：C is the important element for ensureing hardness and quenching degree in steel, can effectively improve quenching degree, C content is inclined
It is low, section hardness uniformity can not be ensured, C content is too high, easily causes segregation and cracking.Therefore C contains in present invention control steel
Amount is in the range of 0.35%-0.40%.
(2)Si：Appropriate Si is advantageous to the deoxidation of steel, can also improve the cutting ability of steel.But too high Si contains
Amount can cause microstructure segregation, reduce the toughness and uniformity of hardness of steel, so Si contents are not easy too high, actual control is
0.52%-0.56%.
(3)Mn：Mn is the strong alloying element for postponing perlitic transformation, can not only improve the intensity of steel, and can be with
Austenite transformation temperature is reduced, improves the quenching degree of steel, but Mn too high levels can make grain coarsening in steel.Therefore present invention control
The control of Mn contents is in 1.7%-1.9% in steel.
(4)P：Under normal circumstances, P belongs to harmful element in steel, increases the fragility of steel, while the P of high level is in steel
In easily cause the generation of component segregation and center porosity, cause plate property uneven, therefore this patent requires the P content in steel
Not higher than 0.010%.
(5)S：S is also harmful element under normal conditions.Steel is produced red brittleness, reduce the ductility and toughness of steel.
Be easy to form sulphide inculsion in steel, at the same aggravate center segregation, it is loose the defects of generation, therefore in application claims steel
S contents are not higher than 0.005%.
(6)Cr：Cr can strengthen austenite supercooling ability, reduce martensite and bainite transformation temperature, significantly improve steel
Quenching degree, promote the formation of bainite under air-cooled condition, coordinate effect when adding more obvious with Mn, but Cr too high levels can be made
Cheng Gangzhong component segregations, therefore it is 2.0%-2.3% that the present invention, which controls Cr contents in steel,.
(7)Nb：Nb can generate a small amount of NbC that is tiny, being evenly distributed with C and suppress dynamic again as micro alloying element
Crystallize, crystal grain thinning, improve the obdurability of steel, increase the quenching degree of steel.Nb contents are in 0.04%- in present invention control steel
0.06%.
A kind of preparation method of new non-quenching and tempering plastic mold steel steel plate, including molten steel pour through converter smelting, external refining
Continuous casting billet is cast, is rolled, heat treatment；
Converter smelting：Control into converter molten iron S≤0.005%, pushing off the slag of keeping under strict control of tapping；Finishing slag basicity control R=3.0~
4.0, accomplish the slugging of morning at initial stage, process scorification is good, and finishing slagization is saturating；Control steel oxygen content in water≤10ppm；
External refining：LF refining process feeds CaSi lines, 200~400 meters/stove of feed quantity to molten steel；RH refinings are using deep
Vacuum outgas operator scheme, it is ensured that pure degassing time>15min；
It is cast into continuous casting billet, during cast, ladle to tundish is using long nozzle protection tapping, tundish to crystallizer use
Submersed nozzle molding casting, the Metal in Tundish degree of superheat control≤20 DEG C；Crystallizer protecting residue uses high-carbon steel privacy protection
Slag；The offline stacking slow cooling of continuous casting billet, more than stacking slow cooling 48h respectively put the hot base of one block of other steel on pile bottom, pile top, by stack position
The side hot semifinished product of placement encloses cold；
Rolling：1200~1220 DEG C of slab heating temperature, steel billet remove iron scale to descaling mill rapidly after coming out of the stove,；Plate
Base start rolling temperature is not less than 1100 DEG C, in the abundant de-scaling of operation of rolling water under high pressure, 890~930 DEG C of finishing temperature, to subtract as far as possible
Few Austenite Grain Growth；
Heat treatment：Steel plate is air-cooled to 200~300 DEG C after rolling, enter stove immediately afterwards and carry out temper, so that each member in steel
Plain fully diffusion, reduce component segregation, 550~580 DEG C of temperature, 1.0~1.4min/mm of heating rate, net soaking time
1.5~2.0min/mm.
The present invention breaks through conventional plastic mould steel alloy design pattern, does not add the alloys such as Mo, Ni of costliness, by C,
The Proper Match of the elements such as Mn, Cr, Nb, reduces component segregation；Refined using LF+RH, calcification processing, whole process protection cast,
The multiple technologies means such as the big pressure rolling of high temperature low speed, control finishing temperature reduce steel plate inner inclusion, loose, stomata etc. and lacked
Fall into, through ultrasound examination, each thickness specification steel plate meets GB/T2970I level standards；Steel plate section hardness is uniform, is distributed in
In 30-32HRC sections, the requirement to high rigidity uniformity P20 plastic die steels in AISI standards is fully met；Tune need not be passed through
Matter processing, reduces energy consumption, greatlys save enterprise's production cost, shorten the production cycle.
The beneficial effects of the present invention are：The invention provides a kind of plastic die steel steel plate and its manufacture method, production
Steel plate thickness be 30~85mm, width and length can be produced according to the actual requirements.
(1) expensive alloying elements such as Ni, Mo are not added, but by properly increasing Cr contents, and add microalloying
Element nb, make C-Cr-Mn-Nb that compound action occur, the stability of material can be increased, suppress dynamic recrystallization, crystal grain thinning,
The obdurability and quenching degree of steel are improved, makes the component segregation of steel smaller, tissue is more uniform.
(2) present invention coordinates appropriate hot rolling and tempering process, avoids carrying out at quenching by optimized alloy composition design
Reason, overcomes the shortcomings that plastic die steel hardening flaw sensitiveness is high, while has reached prevulcanized effect, eliminates quenching tank
Equipped Deng metallurgy, reduce energy consumption, saved mould steel manufacturing cost, shorten the manufacturing cycle.
(3) steel grade section hardness of the present invention has good uniformity, and section hardness difference is only 2HRC, complies fully with AISI standards
Middle P20 hardness requirements.Processing characteristics is good, can be directly used for molding processing.
Brief description of the drawings
Fig. 1 is the steel surface microscopic structure metallograph of the embodiment of the present invention 1.
Fig. 2 is the steel internal microstructure metallograph of the embodiment of the present invention 1.
Embodiment
Below by embodiment, the present invention is further illustrated.
The embodiment of the present invention is handled through converter smelting, external refining, is cast into according to the component proportion of technical scheme, molten steel
Continuous casting billet, roll, heat treatment, the smelting composition of steel of the embodiment of the present invention is shown in Table 1.
Converter smelting：Control into converter molten iron S≤0.005%, pushing off the slag of keeping under strict control of tapping；Finishing slag basicity control R=3.0~
4.0, control steel oxygen content in water≤10ppm；
External refining：LF refining process feeds CaSi lines, 200~400 meters/stove of feed quantity to molten steel；RH refinings are using deep
Vacuum outgas operator scheme, it is ensured that pure degassing time>15min；
Rolling：1200~1220 DEG C of slab target heating temperature, steel billet remove iron oxide to descaling mill rapidly after coming out of the stove
Skin,；Slab start rolling temperature is not less than 1100 DEG C, in the abundant de-scaling of operation of rolling water under high pressure, 890~930 DEG C of finishing temperature；
Heat treatment：Steel plate is air-cooled to 200~300 DEG C after rolling, enter stove immediately afterwards and carry out temper, temperature 550
~580 DEG C, heating rate 1.0~1.4min/mm, net 1.5~2.0min/mm of soaking time.
The smelting composition (wt%) of the steel of the embodiment of the present invention of table 1
Embodiment 1
The production method of the present embodiment 1, molten steel are handled through converter smelting, external refining, are cast into continuous casting billet, mill product
Steel plate specification is 30mm.The main rolling of the steel of the embodiment of the present invention 1 and heat treatment process parameter are shown in Table 2.The steel of the embodiment of the present invention 1
Section hardness test result (HRC) is shown in Table 3.
The main rolling of the steel of 2 embodiment of the present invention of table 1 and heat treatment process parameter
The steel section hardness test result (HRC) of 3 embodiment of the present invention of table 1
Wanted from table 3 it can be seen that the hardness of the 30mm specification steel plates of embodiment 1 can meet P20 hardness in AISI standards
Ask.
Embodiment 2
The production method of the present embodiment, molten steel are handled through converter smelting, external refining, are cast into continuous casting billet, mill product
Steel plate specification is 50mm.The main rolling of the steel of the embodiment of the present invention 2 and heat treatment process parameter are shown in Table 4.The steel of the embodiment of the present invention 2
Section hardness test result (HRC) is shown in Table 5.
The main rolling of the steel of 4 embodiment of the present invention of table 2 and heat treatment process parameter
The steel section hardness test result (HRC) of 5 embodiment of the present invention of table 2)
As can be seen from Table 5, the hardness of the 50mm specification steel plates of embodiment 2 can meet P20 hardness in AISI standards and want
Ask.
Embodiment 3
The production method of the present embodiment, molten steel are handled through converter smelting, external refining, are cast into continuous casting billet, mill product
Steel plate specification is 65mm.The main rolling of the steel of the embodiment of the present invention 3 and heat treatment process parameter are shown in Table 6.The steel of the embodiment of the present invention 3
Section hardness test result (HRC) is shown in Table 7.
The main rolling of the steel of 6 embodiment of the present invention of table 3 and heat treatment process parameter
The steel section hardness test result (HRC) of 7 embodiment of the present invention of table 3
As can be seen from Table 7, the hardness of the 65mm specification steel plates of embodiment 3 can meet P20 hardness in AISI standards and want
Ask.
Embodiment 4
The production method of the present embodiment, molten steel are handled through converter smelting, external refining, are cast into continuous casting billet, mill product
Steel plate specification is 85mm.The main rolling of the steel of the embodiment of the present invention 4 and heat treatment process parameter are shown in Table 8.The steel of the embodiment of the present invention 4
Section hardness test result
(HRC) 9 are shown in Table.
The main rolling of the steel of 8 embodiment of the present invention of table 4 and heat treatment process parameter
The steel section hardness test result (HRC) of 9 embodiment of the present invention of table 4
As can be seen from Table 9, the hardness of the 85mm specification steel plates of embodiment 4 can meet P20 hardness in AISI standards and want
Ask.
Claims (2)
1. a kind of new non-quenching and tempering plastic mold steel steel plate, it is characterised in that the composition of the steel plate is as follows by weight percentage：
0.35%-0.40% C；0.52%-0.56% Si；1.7%-1.9% Mn；≤ 0.010% P；≤ 0.005% S；
2.0%-2.3% Cr；0.04%-0.06% Nb；Surplus is Fe and inevitable impurity.
2. a kind of preparation method of the new non-quenching and tempering plastic mold steel steel plate described in claim 1, including molten steel is through converter smelting
Refining, external refining processing, are cast into continuous casting billet, roll, heat treatment, it is characterised in that：
Converter smelting：Control into converter molten iron S≤0.005%, pushing off the slag of keeping under strict control of tapping；Finishing slag basicity is controlled in R=3.0~4.0,
Control steel oxygen content in water≤10ppm；
External refining：LF refining process feeds CaSi lines, 200~400 meters/stove of feed quantity to molten steel；RH refinings use deep vacuum
Degassing operation pattern, it is ensured that pure degassing time>15min；
Rolling：1200 DEG C~1220 DEG C of slab heating temperature, steel billet remove iron scale to descaling mill rapidly after coming out of the stove；Slab is opened
Temperature is rolled not less than 1100 DEG C, in the abundant de-scaling of operation of rolling water under high pressure, 890 DEG C~930 DEG C of finishing temperature；
Heat treatment：Steel plate is air-cooled to 200~300 DEG C after rolling, enter immediately afterwards stove carry out temper, 550 DEG C of temperature~
580 DEG C, heating rate 1.0min/mm~1.4min/mm, net soaking time 1.5min/mm~2.0min/mm.
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| CN201610728829.2A CN107779773A (en) | 2016-08-26 | 2016-08-26 | A kind of new non-quenching and tempering plastic mold steel steel plate and preparation method thereof |
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| CN201610728829.2A CN107779773A (en) | 2016-08-26 | 2016-08-26 | A kind of new non-quenching and tempering plastic mold steel steel plate and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108504934A (en) * | 2018-05-11 | 2018-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Containing V, Nb, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof |
| CN110681698A (en) * | 2019-09-30 | 2020-01-14 | 宝钢特钢韶关有限公司 | 38MnS6L non-quenched and tempered steel rolling process |
| CN111549280A (en) * | 2020-05-18 | 2020-08-18 | 樟树市兴隆高新材料有限公司 | Plastic die steel and preparation method thereof |
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|---|---|---|---|---|
| CN102650021A (en) * | 2012-05-28 | 2012-08-29 | 上海大学 | Bainite pre-hardening plastic mold steel and preparation method and heat treatment method thereof |
| CN102953013A (en) * | 2012-10-23 | 2013-03-06 | 铜陵科海光电技术有限公司 | Preparation technology of die steel for hot-forging die and die-casting die |
| 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 |
-
2016
- 2016-08-26 CN CN201610728829.2A patent/CN107779773A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102650021A (en) * | 2012-05-28 | 2012-08-29 | 上海大学 | Bainite pre-hardening plastic mold steel and preparation method and heat treatment method thereof |
| CN102953013A (en) * | 2012-10-23 | 2013-03-06 | 铜陵科海光电技术有限公司 | Preparation technology of die steel for hot-forging die and die-casting die |
| 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108504934A (en) * | 2018-05-11 | 2018-09-07 | 攀钢集团攀枝花钢铁研究院有限公司 | Containing V, Nb, N Micro Alloying pre-hardened plastic mold steel and preparation method thereof |
| CN110681698A (en) * | 2019-09-30 | 2020-01-14 | 宝钢特钢韶关有限公司 | 38MnS6L non-quenched and tempered steel rolling process |
| CN111549280A (en) * | 2020-05-18 | 2020-08-18 | 樟树市兴隆高新材料有限公司 | Plastic die steel and preparation method thereof |
| CN111549280B (en) * | 2020-05-18 | 2021-12-21 | 樟树市兴隆高新材料有限公司 | Plastic die steel and preparation method thereof |
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Application publication date: 20180309 |