CN102716910B - Steel tube for die-casting die and preparation method thereof - Google Patents
Steel tube for die-casting die and preparation method thereof Download PDFInfo
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Abstract
The invention provides a steel tube for a die-casting die and a preparation method thereof. The preparation method comprises the following steps of: 1) heating a tube blank to a temperature ranging from 1200-1300 DEG C, and keeping the temperature for 30-45 minutes, so as to obtain a hot blank; 2) punching a conical hole on the hot blank at a temperature of 1100-1200 DEG C, so as to obtain a tubular billet; 3) rolling the tubular billets by using a tube rolling machine, so as to obtain a finished steel tube; and 4) tempering the finished steel tube. According to the preparation method provided by the invention, a manufacturing method for rolling a round blank to be the steel tube is used, so that the batch production of the steel tube for the die-casting die can be realized; the efficiency is high; and the metal pass percent is about 18%. Furthermore, the blank is subjected to rolling deformation and tempering treatment for many times, so that the internal structure of the steel tube is more compact; the properties are more uniform and better; the conventional hole turning and boring technique can be entirely replaced; and the production cost is reduced.
Description
Technical field
The present invention relates to the manufacture field of steel pipe, in particular to a kind of die casting steel pipe and manufacture method thereof.
Background technology
Die casting steel pipe of the present invention mainly refers to that the trade mark is the steel pipe of H13, and H13 is the trade mark in U.S. ASTMA681, close with 4Cr5MoSiV1 trade mark composition in China GB/T 1299-2000.This steel grade has the feature such as high-hardenability and hardenability, high tenacity, high heat-intensity and wearability, is a kind of hot die steel of function admirable.
Main manufacture methods at present for the H13 steel pipe of charging barrel of die casting machine and other die castings is the processing mode adopting circle base+turning bore hole, the larger power consumption of cutting output of this kind of method machine is higher, efficiency is low, recovery rate of iron is low, be only about 70%, add manufacturing cycle and the production cost of enterprise.
Summary of the invention
The present invention aims to provide a kind of die casting steel pipe and manufacture method thereof, the problem that processing capacity of the prior art is little, efficiency is low to solve, metal yield is low.
According to an aspect of the present invention, provide a kind of manufacture method of die casting steel pipe, comprise the following steps: 1) by heating of pipe blank to 1200 ~ 1300 DEG C, and be incubated 30 ~ 45min, obtain hot base; 2) hot base is carried out cone-type piercer at 1100 ~ 1200 DEG C, obtain hollow billet; 3) utilize pipe mill that hollow billet is carried out tube rolling, obtain fished pipe; And 4) fished pipe is carried out temper.
Further, above-mentioned steps 1) comprise and pipe is heated through preheating section successively, heat I section of heating, heat II section of heating, heat III section of heating, heat IV section of heating and incubation step, the total processing time of step 1) is greater than 3.5h, wherein, after preheating section heating, the temperature of pipe reaches 700 ~ 850 DEG C, after heating I section of heating, the temperature of pipe reaches 880 ~ 950 DEG C, after heating II section of heating, the temperature of pipe reaches 950 ~ 1150 DEG C, after heating III section of heating, the temperature of pipe reaches 1100 ~ 1200 DEG C, after heating IV section of heating, the temperature of pipe reaches 1230 ~ 1280 DEG C, then after 1230 ~ 1280 DEG C of insulation 30 ~ 45min, obtain hot base.
Further, the wall thickness of above-mentioned hollow billet is 9 ~ 65mm.
Further, above-mentioned steps 3) comprise the following steps: the rolling of A. pipe mill, obtains through pipe mill rolling the hollow forging that wall thickness is 6 ~ 62mm by hollow billet; B. heat again, hollow forging is heated 1.5 ~ 2.5h again at 1040 ~ 1060 DEG C of temperature; C. stretch reducing, carries out stretch reducing by the hollow forging through heating again, and the sizing reduction of stretch reducing is 20 ~ 50mm, obtains the fished pipe that specification is Φ 51 ~ 219mm × 8 ~ 55mm.
Further, above-mentioned steps 4) the temperature of temper be 800 ~ 850 DEG C, after insulation 2 ~ 3h, air cooling is to room temperature.
Further, in above-mentioned pipe, the mass percentage of each chemical composition is: C 0.32 ~ 0.45%, Si 0.80 ~ 1.25%, Mn 0.20 ~ 0.60%, P≤0.030%, S≤0.030%, Cr 4.75 ~ 5.50%, Mo 1.10 ~ 1.75%, V 0.80 ~ 1.20%, surplus is Fe and impurity.
Further, above-mentioned manufacture method also comprises the step that the drafts of each smoothing roll of adjustment straightener and angle are aligned the fished pipe through step 4) process after step 4).
According to a further aspect in the invention, additionally provide a kind of die casting steel pipe, die casting steel pipe is obtained by manufacture method of the present invention.
Manufacturing method according to the invention, can realize producing in enormous quantities, efficiency is high, metal lumber recovery improves about 18%, and pipe is through rolling sizing and temper, and steel duct is organized more fine and close, performance is more evenly excellent, can substitute existing turning boring process completely, reduces production cost.
Accompanying drawing explanation
Figure of description is used to provide a further understanding of the present invention, forms a part of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 shows the schematic flow sheet of manufacturing method according to the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in embodiments of the invention is described in detail, but following embodiment and accompanying drawing are only understand the present invention, and the present invention can not be limited, the multitude of different ways that the present invention can be defined by the claims and cover is implemented.
In the typical embodiment of one of the present invention, provide a kind of manufacture method of die casting steel pipe, comprise the following steps: 1) by heating of pipe blank to 1200 ~ 1300 DEG C, and be incubated 30 ~ 45min, obtain hot base; 2) hot base is carried out cone-type piercer at 1100 ~ 1200 DEG C, obtain hollow billet; 3) utilize pipe mill that hollow billet is carried out tube rolling, obtain fished pipe; And 4) fished pipe is carried out temper.
The present invention adopts manufacture method circle base being rolled into steel pipe, the production in enormous quantities of die casting steel pipe can be realized, efficiency is high, improve metal lumber recovery about 18%, and blank is through the rolling deformation of multi-pass and temper, steel duct is organized more fine and close, and performance is more evenly excellent, existing turning boring process can be substituted completely, reduce production cost.
In a kind of preferred embodiment of the present invention, step 1) comprises and being heated through preheating section successively by pipe, heat I section of heating, heat II section of heating, heat III section of heating, heat IV section of heating and incubation step, the total processing time of step 1) is greater than 3.5h, wherein, after preheating section heating, the temperature of pipe reaches 700 ~ 850 DEG C, after heating I section of heating, the temperature of pipe reaches 880 ~ 950 DEG C, after heating II section of heating, the temperature of pipe reaches 950 ~ 1150 DEG C, after heating III section of heating, the temperature of pipe reaches 1100 ~ 1200 DEG C, after heating IV section of heating, the temperature of pipe reaches 1230 ~ 1280 DEG C, then after 1230 ~ 1280 DEG C of insulation 30 ~ 45min, obtain hot base.The object heated pipe improves the plasticity of steel, reduce resistance of deformation to adapt to the requirement of the operation hot-working conditions such as perforation, tube rolling, next improves the structure property of steel, make its microstructure homogenization, also contributing to eliminating pernicious gas in steel, being mingled with, the deviation of the heating-up temperature of each bringing-up section of the present invention is ± and 10 DEG C.By Segmented heating, make pipe progressively be elevated to soaking temperature, avoid the too fast problem causing crackle to produce of programming rate.
Perforation be by heating after circular pipe blank on punch, be rolled into the process of hollow hollow billet, object is for follow-up Tube Rolling Train provides the hollow billet meeting technological requirement.In process of production, suitable correction adjustment can be carried out as the case may be to pass schedule setting value, make the setting of rolling parameter more meet the requirement of technique, the preferred piercing temperature of the present invention is about 1100 ~ 1200 DEG C, and the wall thickness of the hollow billet obtained after preferred perforation is 9 ~ 65mm.
Step 3) comprises the following steps: the rolling of A. pipe mill, and it is 6 ~ 62mm hollow forging that hollow billet is obtained wall thickness through pipe mill rolling; B. heat again, hollow forging is heated 1.5 ~ 2.5h again at 1040 ~ 1060 DEG C of temperature; C. stretch reducing, carries out stretch reducing by the hollow forging through heating again, and the sizing reduction of stretch reducing is 20 ~ 50mm, obtains the fished pipe that specification is Φ 51 ~ 219mm × 8 ~ 55mm.
Utilize pipe mill can realize larger drafts, obtain the comparatively accurate hollow forging of size; Heating is mainly used in as the steel pipe of stretch reducing provides uniform finishing temperature again, to guarantee outer-diameter accuracy and the performance of fished pipe, improve the deformation condition of the lower hollow forging of temperature, reduce rolling load, because this steel grade alloying component content is higher, heating-up temperature also should improve again, and target temperature is set to 1050 ± 10 DEG C; The hollow forging of certain size can be produced into the production tube of different size by stretch reducing, except the steel pipe after keeping tandem rolling has except good appearance fineness and high-precision size, the production tube of hot rolling can also be made to have excellent comprehensive serviceability, by above-mentioned steps, after obtaining sizing, the specification limit of fished pipe is Φ 51 ~ 219mm × 8 ~ 55mm.
The temperature of the temper of step 4) of the present invention is 800 ~ 850 DEG C, and after insulation 2 ~ 3h, air cooling is to room temperature.Tempering makes alloying element reasonable distribution between solid solution and the tiny carbide of precipitation in steel pipe, improves the stability of tissue, reduces the hardness of steel pipe, is convenient to following process; Adopt air cooling process after tempering, decrease steel pipe internal stress, improve plasticity and the toughness of steel pipe.
Mass percentage as chemical composition each in the pipe of raw material used in the present invention is: C 0.32 ~ 0.45%, Si0.80 ~ 1.25%, Mn 0.20 ~ 0.60%, P≤0.030%, S≤0.030%, Cr 4.75 ~ 5.50%, Mo 1.10 ~ 1.75%, V0.80 ~ 1.20%, surplus is Fe and impurity.Control as component content various in the pipe of raw material within the specific limits, also adapt to the requirement of manufacture method of the present invention to raw material, to obtain the die casting steel pipe of function admirable with the performance requirement meeting die casting steel pipe simultaneously.
Preferably, manufacture method of the present invention also comprises the step that the drafts of each smoothing roll of adjustment straightener and angle are aligned the fished pipe through step 4) process after step 4).After entering straightener through the fished pipe of step 4) process, adjust each smoothing roll to the drafts of steel pipe and angle, the adjustment of drafts is mainly played and is provided enough frictional force to steel pipe, be conducive to nipping of steel pipe, and change steel pipe is out of shape distribution uniformity when straightening deformation, the adjustment of drafts is according to different working rolls, the material of steel pipe, external diameter and wall thickness and original curved degree and determine.The object of smoothing roll angle adjustment ensures that steel pipe is at least 2/3 with the contact length of smoothing roll, and the angle adjustment of smoothing roll should from large to small, recessed to avoid steel pipe to be rectified, the inclination angle that simultaneously should ensure each smoothing roll unanimously, to obtain good leveling effect.
In the another kind of typical embodiment of the present invention, additionally provide a kind of die casting steel pipe, die casting steel pipe is obtained by manufacture method of the present invention.Utilize the steel pipe that manufacture method of the present invention obtains, due in the fabrication process through heating for multiple times, that rolling deformation makes steel duct organize is more fine and close, performance is more excellent.
Below with reference to embodiment and comparative example, further illustrate and adopt beneficial effect of the present invention.
Embodiment 1
The manufacture trade mark is H13(4Cr5MoSiV1), specification is the steel pipe of Φ 114 × 27mm, composition in mass %, in the pipe used, each component content is: C:0.32 ~ 0.45, Si:0.80 ~ 1.25, Mn:0.20 ~ 0.60, P :≤0.030, S :≤0.030, Cr:4.75 ~ 5.50, Mo:1.10 ~ 1.75, V:0.80 ~ 1.20, remainder is Fe and inevitable impurity, pipe external diameter is Φ 160mm, and length is 2500mm.
Tube-rolling technique flow process:
Heating of pipe blank → cone-type piercer → tube rolling → de-rod → heat again → stretch reducing → temper → aligning → desk checking → reinspection → spray printing → weigh → put in storage.
The technological parameter of heating of pipe blank: in annular furnace, pipe is preheated to 702 DEG C with furnace temperature, heating I section of target temperature be 883 DEG C, heating II section of target temperature is 961 DEG C, heating III section of target temperature is 1154 DEG C, heating IV section of target temperature is 1263 DEG C, soaking zone target temperature is 1254 DEG C of soaking, total heat time >3.5 hour.
The technological parameter of perforation: at the enterprising eleven punch 11 of punch, dancer rools distance is 143mm, roll off angle is 15 °, advancing angle is 10 °, guide plate distance is 168mm, top front reduction ratio is 4.8%, front-extending quantity is 145mm, and the hollow billet obtained after perforation is of a size of Φ 168 × 30 × 3700mm.
The technological parameter of tube rolling: adopt three roller A Saier pipe mills to carry out tube rolling, the diameter of plug is Φ 83mm, roll off angle is 4 °, advancing angle is 8 °, the external diameter of pore throat is Φ 137mm, hollow forging size Φ 139 × 27 × 5150mm obtained after tube rolling.
The technological parameter heated again: heating target temperature be 1040 DEG C, the heat time is 2h.
The technological parameter of temper: temperature is 840 ± 10 DEG C, temperature retention time 2.5h.
Steel pipe after temper is through aligning, because the flexibility with a collection of steel pipe through tempering is different, and the drafts of each smoothing roll is determined according to original curved degree, therefore adjust the drafts of each smoothing roll from small to large between 2 ~ 8mm in this embodiment,, adjustment angle ensures that the contact length of steel pipe and smoothing roll is 3/4.
Steel pipe through aligning is carried out desk checking, reinspection successively, carries out spray mark, japanning after qualified, packaging warehouse-in, obtaining the final trade mark is H13(4Cr5MoSiV1), specification is the steel pipe of Φ 114 × 27mm.
Analyze obtained steel pipe grab sample, analysis result is in table 1.
Comparative example 1
Getting the trade mark utilizing turning boring process to manufacture is H13(4Cr5MoSiV1), specification is the steel pipe as a comparison case 1 of Φ 114 × 27mm, and analyzes this steel pipe, and analysis result is in table 1.
Table 1
| Specification (mm) | Outer-diameter accuracy (mm) | Wall thickness accuracy (mm) | Hardness (HB) | |
| Embodiment 1 | Φ114×27 | 114.2~114.8 | 26.9~27.7 | 180~220 |
| Comparative example 1 | Φ114×27 | 113.9~114.3 | 27.0~27.4 | 150~190 |
Data as can be seen from table 1, the outer-diameter accuracy of the steel pipe of the comparative example 1 that the outer-diameter accuracy of the steel pipe of the embodiment 1 utilizing manufacture method of the present invention to obtain and wall thickness accuracy and turning boring process of the prior art obtain is suitable with wall thickness accuracy; And the hardness of the steel pipe that embodiment 1 obtains is better than the hardness of the steel pipe of comparative example 1, thus prove that the interior tissue of the steel pipe utilizing manufacture method of the present invention to obtain is more fine and close, performance is more excellent.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. a manufacture method for die casting steel pipe, is characterized in that, comprises the following steps:
1) by heating of pipe blank to 1200 ~ 1300 DEG C, and be incubated 30 ~ 45min, obtain hot base;
2) described hot base is carried out cone-type piercer at 1100 ~ 1200 DEG C, obtain hollow billet;
3) utilize pipe mill that described hollow billet is carried out tube rolling, obtain fished pipe; And
4) described fished pipe is carried out temper, described step 4) the temperature of temper be 800 ~ 850 DEG C, after insulation 2 ~ 3h, air cooling is to room temperature, and in described pipe, the mass percentage of each chemical composition is: C 0.32 ~ 0.45%, Si0.80 ~ 1.25%, Mn 0.20 ~ 0.60%, P≤0.030%, S≤0.030%, Cr 4.75 ~ 5.50%, Mo 1.10 ~ 1.75%, V 0.80 ~ 1.20%, surplus is Fe and impurity.
2. manufacture method according to claim 1, it is characterized in that, described step 1) comprise described pipe successively through preheating section heating, heating I section of heating, heating II section of heating, heating III section of heating, heating IV section heating and incubation step, described step 1) total processing time be greater than 3.5h, wherein
After described preheating section heating, the temperature of described pipe reaches 700 ~ 850 DEG C, after described heating I section heating, the temperature of described pipe reaches 880 ~ 950 DEG C, after described heating II section heating, the temperature of described pipe reaches 950 ~ 1150 DEG C, after described heating III section heating, the temperature of described pipe reaches 1100 ~ 1200 DEG C, after described heating IV section heating, the temperature of described pipe reaches 1230 ~ 1280 DEG C, then, after described 1230 ~ 1280 DEG C of insulation 30 ~ 45min, described hot base is obtained.
3. manufacture method according to claim 1, is characterized in that, the wall thickness of described hollow billet is 9 ~ 65mm.
4. manufacture method according to claim 1, is characterized in that, described step 3) comprise the following steps:
A. pipe mill rolling, obtains through described pipe mill rolling the hollow forging that wall thickness is 6 ~ 62mm by described hollow billet;
B. heat again, described hollow forging is heated 1.5 ~ 2.5h again at 1040 ~ 1060 DEG C of temperature;
C. stretch reducing, carries out stretch reducing by the hollow forging through heating again, and the sizing reduction of described stretch reducing is 20 ~ 50mm, obtains the fished pipe that specification is Φ 51 ~ 219mm × 8 ~ 55mm.
5. manufacture method according to claim 1, it is characterized in that, described manufacture method is in described step 4) after also comprise the drafts of each smoothing roll of adjustment straightener and angle to through described step 4) the described fished pipe that the processes step of aligning.
6. a die casting steel pipe, is characterized in that, described die casting steel pipe is obtained by the manufacture method according to any one of claim 1 to 5.
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| CN105382049A (en) * | 2015-11-26 | 2016-03-09 | 佛山市高明区杨和金属材料专业镇技术创新中心 | Production process for metal steel pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2608164Y (en) * | 2003-02-26 | 2004-03-31 | 赵金发 | Continuous tube mill core rod |
| CN101956137A (en) * | 2010-10-12 | 2011-01-26 | 衡阳华菱钢管有限公司 | Seamless steel tube for manufacturing hollow core rod and production method |
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| JP3214348B2 (en) * | 1996-03-25 | 2001-10-02 | 住友金属工業株式会社 | Manufacturing method of alloy steel pipe |
| JP3869747B2 (en) * | 2002-04-09 | 2007-01-17 | 新日本製鐵株式会社 | High-strength steel plate, high-strength steel pipe and manufacturing method excellent in deformation performance |
| RU2375470C1 (en) * | 2006-03-28 | 2009-12-10 | Сумитомо Метал Индастриз, Лтд. | Method for manufacturing of seamless pipe of small and large diametre |
| JP4915121B2 (en) * | 2006-03-31 | 2012-04-11 | 住友金属工業株式会社 | Manufacturing method of duplex stainless steel seamless pipe |
| CN101658879A (en) * | 2008-08-27 | 2010-03-03 | 宝山钢铁股份有限公司 | Method for manufacturing seamless steel pipe |
| CN101811149B (en) * | 2010-04-14 | 2012-05-23 | 新兴铸管股份有限公司 | Manufacturing method of high alloy seamless steel tube |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2608164Y (en) * | 2003-02-26 | 2004-03-31 | 赵金发 | Continuous tube mill core rod |
| CN101956137A (en) * | 2010-10-12 | 2011-01-26 | 衡阳华菱钢管有限公司 | Seamless steel tube for manufacturing hollow core rod and production method |
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