CN1076760C - Frame steel of plastic mould and its manufacture method - Google Patents
Frame steel of plastic mould and its manufacture method Download PDFInfo
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- CN1076760C CN1076760C CN99127011A CN99127011A CN1076760C CN 1076760 C CN1076760 C CN 1076760C CN 99127011 A CN99127011 A CN 99127011A CN 99127011 A CN99127011 A CN 99127011A CN 1076760 C CN1076760 C CN 1076760C
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Abstract
The present invention relates to die carrier steel of plastic dies and a manufacturing method thereof. The die carrier steel of plastic dies is composite microalloyed steel of ferrite, pearlite and bainite and comprises 0.20 to 0.28 wt% of C, 2.1 to 2.5 wt% of Mn, 0.01 to 0.025 wt% of S, 0.0005 to 0.005 wt% of B, 0.0005 to 0.01 wt% of Ca, 0.008 to 0.02 wt% of N, a proper amount of Si and V, and Fe as the rest. Steel ingots obtained after the constituents are smelted are heated to 1200(+/-)20 DEG C and then are forged or rolled at the finish forging temperature or finish rolling temperature larger than 950 DEG C, and the compression ratio is from 3 to 4. Then, the air cooling is carried out, and tempering treatment is not needed. The hardness of the steel is from VHN210 to 250, and the surface and the core of a module with a large cross section have the same hardness and structure. The steel has favorable cutting and processing performance and low sensitivity to crack cutting by flame gas and is suitable for manufacturing die carriers of plastic dies and die cavities of rubber dies.
Description
The present invention relates to a kind of microalloyed steel that is used for mould.
The plastic casing or the bakelite spare of household electrical appliances such as refrigerator, televisor, washing machine, air-conditioning, duplicating machine, computer, it makes the plastic die steel and the mould bases steel of usefulness, and the mold cavity steel of making rubber product generally has following technical feature to require: (1) large section mold core has equal hardness and tissue with the surface, and hardness is VHN210～250, (2) good machinability, (3) low flame gas isolates line susceptibility.Be extensive use of medium carbon steel at present, make this class mould and mould bases as S48C-55C, its hardness is VHN150-200, is organized as ferrite+perlite, and SMIS and surface hardness differ more than the 50VHN, and its wear resistance and polishability are poor, and die life is short; In addition, because their carbon content height, flame gas isolates line susceptibility height, can not use the flame gas cutting.The Europe number of patent application of application on May 8th, 1987 is that the mould alloy steel of EP0247415A2 and the application number of application on May 28th, 1986 are the Chinese patent " easy cutting and high tougness die steel for plastics " of CN86103713A, they are for solving wear resistance and polishability problem, carbon quenched and tempered steel in the employing, its hardness is VHN280～350, surpass and use the hardness requirement, be organized as the tempered sorbite tissue, flame gas isolates line susceptibility height, can not use the flame gas cutting.
The object of the present invention is to provide a kind of frame steel of plastic mould and manufacture method thereof, this steel can become mould mould bases and the required particular manufacturing craft mould bases steel of rubber product mold cavity of making home electric appliance housing or bakelite spare, meets above-mentioned particular technology performance requriements.
For achieving the above object, the present invention develops the non-scheduling steel of a kind of microalloying, guarantee that the large section mould is organized as ferrite+perlite+bainite at air cooling situation lower surface to core, Hardness Distribution is even, hardness is VHN210～250, and its carbon content and carbon equivalent are low, and flame gas cutting susceptibility is low.Characteristics of the present invention are: frame steel of plastic mould of the present invention is the microalloyed steel of ferrite+perlite+bainite three-phase composite, by weight percentage, its composition is C0.20～0.28, Mn2.1～2.5, S0.01～0.025, B0.0005～0.005, Ca0.0005～0.01, N0.008～0.02.Ti/N=3～4, an amount of Si, V, surplus is Fe.Above-listed Si, the content of V can be Si0.01～0.60 by weight percentage, V0.05～0.18.
Characteristics of the present invention are the key elements of control, as by weight percentage, C is 0.20～0.28, Mn＞2.0 and micro-B, this just guarantees that module steel whole cross section when air cooling, large section (thickness reaches 500mm) all obtains ferrite+perlite+bainite structure, and its Hardness Distribution is even, highest hardness is poor≤and 30VHN; Control element S and Ca improve the machinability of steel; An amount of control N and Ti under Ti/N=3～4 situations, guarantee that steel when the Direct Air-Cooled of elevated temperature heat processing back, does not need to carry out modifier treatment again, and has the favorable mechanical performance.In addition, the carbon content of steel is low, and carbon equivalent is also low, and then to isolate line susceptibility low for flame gas, can carry out the flame gas cutting.
Each composition Design Mechanism to frame steel of plastic mould alloying constituent of the present invention elaborates below:
C: for reducing the carbon equivalent of steel, reduce the gas cutting crack sensitivity of steel, need to reduce carbon content, but carbon content is too low, will be unfavorable for the acquisition of bainite structure, the hardness of steel can not guarantee.For this reason, by weight percentage, C＞0.30, should adopt C content is 0.20～0.28.
Mn: by weight percentage, content will increase carbon equivalent greater than the acquisition that helped bainite structure at 2.0 o'clock but its content is too high, and for this reason, should adopt Mn content is 2.1～2.5.
S: help the improvement of machinability, but by weight percentage, if S＞0.03 will have a strong impact on the corrosion resistance nature of steel.For this reason, should adopt S content is 0.01～0.025.
V: the purpose that adds V in the steel is in order to utilize it forging or rolling the back and separate out carbonitride from ferrite, to improve the hardness and the intensity of steel.In addition, V helps the acquisition of bainite in the steel.But content V by weight percentage＞0.20 will seriously reduce the plasticity and the toughness of steel.For this reason, should adopt V content is 0.05～0.18.
The B:B solid solution will make in matrix that warm structural transformation (ferrite, perlite and bainite) is strong in all of steel postpones, and it and the compound adding of Mo help evenly to obtain bainite in very wide cooling rate scope.But, influence the performance of its effect when it can form carbide during content＞0.005 by weight percentage.For this reason, should adopt B content is 0.0005～0.005.
Ca: make oxide compound and the same time variation of sulfide in the steel, and sulfide wraps up oxide compound, help improving the machinability of steel.Because vapour pressure is big, by weight percentage, Ca content＞0.01 is not easy to add in the steel.Should adopt Ca content is 0.0005～0.01.
Ti: fix N, form TiN, can hinder growing up of austenite crystal in the equal thermal process, help improving the toughness of steel.Simultaneously, it has avoided the formation of BN, can give full play to the useful effect of B.Too many N will form thick TiN, be unfavorable for cutting ability.For this reason, should adopt Ti/N=3～4.
According to above-mentioned alloy designs scheme, steel ingot after smelting is heated to 1200 ± 20 ℃, forge or roll, finish-forging or finishing temperature are＞950 ℃, compression ratio is 3～4, air cooling need not to carry out modifier treatment again and can obtain along the uniform ferrite+perlite of thickness module cross-sectional distribution+bainite three-phase composite tissue and hardness are the mould mould bases steel of VHN210～250 greatly then.
The present invention compared with prior art, have following conspicuous outstanding feature and remarkable advantage: the present invention is by each component content of control, make the carbon content and the carbon equivalent of this steel lower than existing medium carbon steel, and acquisition ferrite+perlite+bainite three-phase composite tissue, thereby its hardness is moderate, be VHN210～250, highest hardness difference≤30VHN, polishability, wear resistance and work-ing life than medium carbon steel (as S48C～55C) good, it is low that flame gas isolates line susceptibility, the flame gas cutting be can carry out, mould mould bases and the rubber mold die cavity of making plastics are applicable to.
Accompanying drawing is the metallographic of the ferrite+perlite+bainite structure of the one embodiment of the invention steel figure that takes pictures.
An optimum implementation of the present invention is: by weight percentage, the composition of steel is: C is 0.22, Mn is 2.2, S is 0.01, Si is 0.29, Ti is 0.025, N is 0.0074, V is 0.12, and Ca is 0.003, and B is 0.0025, and surplus is Fe.Smelt at the laboratory non-vacuum induction furnace by this composition.Its carbon equivalent ce is 0.6, less than medium carbon steel commonly used (as S48C～55C).
This steel is after smelting, and steel ingot forges through being heated to 1200 ± 20 ℃, and compression ratio is 3～4, final forging temperature＞950 ℃, and air cooling and sand cooling then, measuring its hardness is VHN230～250, and the hardness indifference under two kinds of cooling conditionss, shows good uniformity.Tissue is ferrite+perlite+bainite simultaneously, as shown in drawings.
Claims (2)
1. a frame steel of plastic mould is characterized in that this steel is the microalloyed steel of ferrite+perlite+bainite three-phase composite, by weight percentage, its composition is C0.20～0.28, Mn2.1～2.5, S0.01～0.025, B0.0005～0.005, Ca0.0005～0.01, N0.008～0.02, Ti/N=3～4, Si0.10～0.60, V0.05～0.18, surplus are Fe.
2. according to the manufacture method of the described frame steel of plastic mould of claim 1, it is characterized in that the steel ingot after smelting is heated to 1200 ± 20 ℃, to forge or roll, finish-forging or finishing temperature are＞950 ℃, compression ratio is 3～4, then air cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99127011A CN1076760C (en) | 1999-12-29 | 1999-12-29 | Frame steel of plastic mould and its manufacture method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN99127011A CN1076760C (en) | 1999-12-29 | 1999-12-29 | Frame steel of plastic mould and its manufacture method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1264747A CN1264747A (en) | 2000-08-30 |
| CN1076760C true CN1076760C (en) | 2001-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN99127011A Expired - Lifetime CN1076760C (en) | 1999-12-29 | 1999-12-29 | Frame steel of plastic mould and its manufacture method |
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| CN (1) | CN1076760C (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094154B (en) * | 2009-12-14 | 2012-08-22 | 宝山钢铁股份有限公司 | Homogeneous module material and metallurgical manufacturing method thereof |
| CN102191436A (en) * | 2010-03-19 | 2011-09-21 | 宝山钢铁股份有限公司 | Martensitic stainless steel with good comprehensive performance and preparation method thereof |
| CN102433501B (en) * | 2011-12-02 | 2013-08-28 | 山西太钢不锈钢股份有限公司 | High strength and toughness strip steel and manufacturing method thereof |
| CN105478469A (en) * | 2015-12-19 | 2016-04-13 | 重庆麦拓科技有限公司 | Tool and mould steel processing technology |
| CN105499266A (en) * | 2015-12-19 | 2016-04-20 | 重庆麦拓科技有限公司 | Tool and mold steel processing technology |
| CN110656291B (en) * | 2019-11-07 | 2020-09-25 | 广东韶钢松山股份有限公司 | Wear-resistant steel plate and preparation method thereof |
| CN114107820B (en) * | 2021-11-26 | 2023-06-02 | 宝武集团鄂城钢铁有限公司 | Steel plate with elongation more than 30% and good cutting performance and production method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224769A (en) * | 1998-12-30 | 1999-08-04 | 宝山钢铁(集团)公司 | Making process of microalloyed plastic-mould steel |
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1999
- 1999-12-29 CN CN99127011A patent/CN1076760C/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1224769A (en) * | 1998-12-30 | 1999-08-04 | 宝山钢铁(集团)公司 | Making process of microalloyed plastic-mould steel |
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| CN1264747A (en) | 2000-08-30 |
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Owner name: BAOSHAN IRON & STEEL CO., LTD. Free format text: FORMER NAME OR ADDRESS: SHANGHAI BAO STEEL GROUP IRON AND STEEL CO LTD |
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| CP03 | Change of name, title or address |
Address after: Orchard, Fujin Road, Baoshan District, Shanghai Patentee after: Baoshan Iron & Steel Co., Ltd. Address before: No. 370 Pu circuit, Shanghai, Pudong New Area Patentee before: Baoshan Iron and Steel Group Co., Shanghai |
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Granted publication date: 20011226 |
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