CN101195153A - Ingot case for producing round ingot and casting method thereof - Google Patents
Ingot case for producing round ingot and casting method thereof Download PDFInfo
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- CN101195153A CN101195153A CNA2007102032280A CN200710203228A CN101195153A CN 101195153 A CN101195153 A CN 101195153A CN A2007102032280 A CNA2007102032280 A CN A2007102032280A CN 200710203228 A CN200710203228 A CN 200710203228A CN 101195153 A CN101195153 A CN 101195153A
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Abstract
The invention discloses an ingot mould for round steel ingots and a casting method. The invention is in particular suitable to methods which are used to produce round steel ingots through rolling with seamless steel tubes. The invention provides the ingot mould and the casting method which solve a problem that crackles are produced during a process of casting the round steel ingots. The technical scheme of the invention comprises producing the ingot mould of the round steel ingots, and the ingot mould comprises an ingot whose inner cavity takes a cylinder shape, and ingot thickness of an upper port portion is less than ingot thickness of a lower port portion. The invention simultaneously provides a casting method for producing the round steel ingots, which adopts the ingot mould whose inner cavity takes the cylinder shape, and a bottom pouring method while in casting, casting line speed of ingot bodes of steel ingots is 100-180 mm/min, and a filling line speed on a cap portion is 10-90 mm/min. The round steel ingots which are produced through adopting the ingot mould and the casting method of the invention is enabled to guarantee effectively the finished product rate of steel pipes and increase economic benefits for enterprises. Simultaneously, round steel ingots which are used to produce pipes with large diameters and thick walls are provided without modifying roll shapes of rolling pipe piercers.
Description
Technical field
The present invention relates to a kind of ingot mould and casting method thereof of round ingot, particularly be suitable for being used for the production method of the round ingot of roll seamless steel tube.
Technical field
The existing steel ingot that is directly used in roll seamless steel tube mainly is a circle wave steel ingot, the rippled edge number is 17～27 limits, the manufacturing process of ingot mould bothers very much, owing to form crackle between crest and the trough easily, the steel tube surface of institute's Rolling Production is the folding and outside fold defect of formation easily, makes the steel pipe reconditioning quality and cuts useless amount greatly, and lumber recovery is low, punch also must be revised the punch roll shape in order to adapt to the profile of round wave steel ingot in addition.
If employing round ingot, just can address the above problem, but because the ratio of the cross-sectional area of round ingot and ingot mould Zhou Bianchang is bigger, heat conduction velocity is smaller comparatively speaking, unreasonable or casting process control is bad when ingot mould design, the epidermal area that forms is thinner, is easy to generate longitudinal crack, even cracking.
Steel research, 2000 (2) 18～22, the research of low-alloy structural steel billet and control, wherein analyzed the influence of the stability, mould temperature etc. of cast temperature, ladle molten steel temperature to the steel ingot longitudinal crack, and the direction that some solve crackles proposed, but do not have to propose in actual application, can effectively solve the concrete measure of round ingot longitudinal crack, and the object of its research is the less steel ingot of weight.CTAIb, 1990, the crackle that the pipe steel ingot takes place is reduced in NO9.76～78, also discloses the analysis explanation that round ingot is produced in process of production the problem of underbead crack.But above-mentioned article and other relevant reports all also do not provide the technical scheme that can effectively address this problem, and particularly for the large-scale round ingot that will satisfy the tube rolling requirement, more are easy to generate effective solution of defectives such as crackle in casting cycle.Therefore in actual production, the crack defect of round ingot is that influence is used for the principal element that tube rolling is produced with round ingot.
Summary of the invention
Technical problem to be solved by this invention provides a kind of ingot mould and casting method thereof that cracks in the round ingot casting cycle that solve.
The technical scheme that technical solution problem of the present invention is adopted is: produce the ingot mould of round ingot, comprise the ingot mould of being with inner chamber, the ingot mould thickness at its place suitable for reading is less than the ingot mould thickness at end opening place.
As improvement of the present invention, the ingot mould thickness at ingot mould place suitable for reading is 0.10～0.18 with the ratio of ingot mould external diameter, and the ingot mould thickness at end opening place is 0.12～0.20 with the ratio of ingot mould external diameter.
The internal diameter tapering of described ingot mould is 0～0.5%.
Inwall suitable for reading at ingot mould is equipped with the ring-type heat-insulating shield.
The ring-type heat-insulating shield of an internal diameter greater than the heat-insulating shield internal diameter is installed on the inwall of heat-insulating shield bottom ingot mould at least, and perhaps described heat-insulating shield is the taper of top internal diameter less than the bottom internal diameter.
The chemical composition of ingot mould comprises C3.1～3.5%, Si1.0～1.5%, and Mn1.5～2.1%, P≤0.15%, S≤0.10%, all the other are Fe.
The casting method of production round ingot of the present invention, adopting inner chamber is circular ingot mould, is the method for making a bet during casting, it is characterized in that: steel ingot ingot body casting linear velocity is 100～180mm/min, and cap portion interstitial wire speed is 40～90mm/min.
Molten steel overheat is 30～55 ℃ during casting.
The round ingot that adopts ingot mould of the present invention and casting method to produce, can guarantee the lumber recovery of steel pipe effectively, increase economic benefit of enterprises, can provide simultaneously and produce heavy caliber, the required round ingot of thick-walled pipe, do not need again the roll shape of tube rolling punch is made amendment.
Description of drawings
Fig. 1 is the scheme of installation of teeming mould of the present invention;
Fig. 2 is the ingot mould structural representation suitable for reading of first kind of embodiment of the present invention;
Fig. 3 is the ingot mould structural representation suitable for reading of second kind of embodiment of the present invention;
Fig. 4 is the ingot mould structural representation suitable for reading of the third embodiment of the present invention.
The graphical indicia explanation: the 1-ingot mould, 2-is suitable for reading, 3-end opening, heat-insulating shield under the 4-, 5-heat-insulating shield, 6-base, 7-molten steel rises mouth, 8-feed trumpet.
The specific embodiment
The ingot mould of production round ingot of the present invention comprises that inner chamber is columniform ingot mould 1, at the ingot mould thickness at 2 places suitable for reading of ingot mould 1 ingot mould thickness less than end opening 3 places, the axial cross section that is ingot mould 1 is up-small and down-big trapezoidal, create condition for the thicker chill of molten steel solidification initial stage formation, avoided defectives such as steel ingot cracks, loosens effectively.According to different steel ingot specification and steel grades, the ingot mould thickness at ingot mould place suitable for reading and the ratio 0.10～0.18 of ingot mould external diameter, the ingot mould thickness at end opening place is 0.12～0.20 with the ratio of ingot mould external diameter.
The inner chamber tapering of ingot mould 1, promptly the end opening internal diameter size subtracts the difference of internal diameter size suitable for reading and the ratio of ingot mould height is 0～0.5%.The round ingot profile that adopts this ingot mould structure to produce is close with present continuous cast round billets, applicable to polytype tube rolling unit tube rolling, and is convenient to the demoulding.
As shown in Figure 1, ingot mould is installed on the base 6, on the general base 6 2～8 ingot moulds are installed, the centre of base 6 is installed feed trumpet 8 is set, feed trumpet 8 is communicated with each ingot mould inner chamber by the molten steel rises mouth 7 that is arranged on the base 6, can realize the casting of a plurality of ingot moulds simultaneously.
Existing ingot mould is provided with heat-insulating shield at inwall suitable for reading, helps insulation, and the setting rate of slowing down steel ingot is improved the solidified structure of box-hat portion, reduces loose, the shrinkage cavity defect of steel ingot inside.But, and influence the quality of steel ingot because the thickness of heat-insulating shield causes the covering slag in the casting to be deposited in the heat-insulating shield lower position.In order to reduce the accumulation of covering slag, the bottom thickness of heat-insulating shield is reduced or be designed to be convenient to the conical surface of MOLTEN STEEL FLOW, thereby effectively improve the internal soundness of steel ingot.
The chemical composition of ingot mould 1 comprises C3.1～3.5%, Si1.0～1.5%, and Mn1.5～2.1%, P≤0.15%, S≤0.10%, all the other are Fe.Adopt the ingot mould of this material, the material of using has improved heat-transfer effect at present, has increased the chill thickness of steel ingot.
The casting method of production round ingot of the present invention, adopt above-mentioned ingot mould, be the method for making a bet during casting, the steel ingot body is that the casting linear velocity of the inner chamber of ingot mould 1 is 100～180mm/min, cap portion interstitial wire speed is 40～90mm/min, guarantee the densification of steel ingot central tissue, avoid steel ingot to produce shrinkage cavity and loose.
In order to reduce the thermal stress that the steel ingot internal-external temperature difference causes, prevent that surface of steel ingot from cracking, adopt the low overheat casting process, molten steel overheat is 30～55 ℃ during casting, as the mild steel cast temperature is 1565～1580 ℃, the low-alloy steel cast temperature is 1550～1570, and the steel alloy cast temperature is 1540～1560 ℃.If the degree of superheat of molten steel is big, the thermograde of the ingot solidification shell and the liquid heart is increased, thermal stress increases, simultaneously owing to annotate the rising of temperature, make the chill attenuate of steel ingot, under the effect of static pressure, the probability that makes steel ingot produce longitudinal crack increases, temperature is high more, and the incidence of longitudinal crack is just high more.
The external diameter that adopts the round ingot of ingot mould of the present invention and casting method production is 500～1150mm, and weight can reach 2.5～14T, can satisfy the requirement of tube rolling unit.
Producing steel grade is 20G high temperature carbon steel round ingot.
Ingot mould as shown in Figure 1, ingot mould 1 inner chamber is cylindrical, adopts existing mode to be installed on the following base 6, base 6 is provided with molten steel rises mouth 7.The internal diameter at ingot mould 1 end opening 3 places is 780mm, ingot mould thickness 190mm, and thickness is 0.16 with the ratio of external diameter, and the internal diameter at 2 places suitable for reading is 765mm, and ingot mould thickness is 140mm, and thickness is 0.13 with the ratio of external diameter, the high 3400mm of ingot mould, the internal diameter tapering of ingot mould 1 is 0.44%.
Be provided with in suitable for reading 2 inside of ingot mould and highly be 120mm, internal diameter is the ring-type heat-insulating shield 5 of 670mm., the covering slag in preventing to cast influences simultaneously the quality of steel ingot for being deposited in heat-insulating shield 5 lower positions; it is 150mm that a height is installed on the inwall of the ingot mould below heat-insulating shield 51 as shown in Figure 2; internal diameter is a heat-insulating shield 4 under the ring-type of 710mm; therefore the heat-insulating shield thickness in each stepped portions reduces accordingly, thereby reduces the accumulation of covering slag at this place.Heat-insulating shield 4 under the ring-type of more than one different inner diameters also can be set as required, and heat-insulating shield 4 is ladder-like arranged from top to bottom under the ring-type, just can play better effect.
During casting, liquid steel temperature is 1561 ℃, adopts the method for making a bet to inject ingot mould from the molten steel rises mouth 7 on the base 6, and the casting linear velocity of steel ingot body is 150～180mm/min, and cap portion interstitial wire speed is 70～90mm/min.
Embodiment 2
Producing steel grade is 1Cr5Mo heat resisting steel round ingot.
Ingot mould as shown in Figure 1, ingot mould 1 inner chamber is cylindrical, adopts existing mode to be installed on the following base 6, base 6 is provided with molten steel rises mouth 7.The internal diameter at ingot mould 1 end opening 3 places is 570mm, ingot mould thickness 160mm, and thickness is 0.18 with the ratio of external diameter, and the internal diameter at 2 places suitable for reading is 560mm, and ingot mould thickness is 120mm, and thickness is 0.15 with the ratio of external diameter, the high 2100mm of ingot mould.
As shown in Figure 3, in suitable for reading 2 inside of ingot mould ring-type heat-insulating shield 5 is set, the top internal diameter of this heat-insulating shield 5 is 460mm, highly is the ring-type of 100mm, and the bottom is the taper that internal diameter strengthens gradually
During casting, liquid steel temperature is 1563 ℃, adopts the method for making a bet to inject ingot mould from the molten steel rises mouth 7 on the base 6, and the casting linear velocity of steel ingot ingot body is 148～160mm/min, and cap portion interstitial wire speed is 60～75mm/min.
Producing steel grade is 27SiMn structural alloy steel round ingot.
Ingot mould as shown in Figure 1, ingot mould 1 inner chamber is cylindrical, adopts existing mode to be installed on the following base 6.The internal diameter at ingot mould 1 end opening 3 places is 570mm, ingot mould thickness 170mm, and thickness is 0.19 with the ratio of external diameter, and the internal diameter at 2 places suitable for reading is 560mm, and ingot mould thickness is 145mm, and thickness is 0.17 with the ratio of external diameter, the high 2100mm of ingot mould, the internal diameter tapering of ingot mould is 0.48%.
Be provided with in suitable for reading 3 inside of ingot mould and highly be 170mm, internal diameter is the ring-type heat-insulating shield 5 of 460mm.Be equipped with successively on the inwall of the ingot mould 1 below heat-insulating shield 5 highly and be that 50mm, internal diameter are 501mm and highly are 30mm, internal diameter is a heat-insulating shield 4 under two ring-types of 521mm.From processing and setting angle, can be with heat-insulating shield 4 under heat-insulating shield 5 and the ring-type as shown in Figure 4 an integral body.
During casting, liquid steel temperature is 1548 ℃, and the casting linear velocity of steel ingot body is 100～135mm/min, and cap portion interstitial wire speed is 40～55mm/min.
Claims (9)
1. produce the ingot mould of round ingot, comprise the ingot mould of being with inner chamber, it is characterized in that: the ingot mould thickness that the ingot mould thickness that (2) suitable for reading are located is located less than end opening (3).
2. the ingot mould of production round ingot as claimed in claim 1 is characterized in that: the ingot mould thickness that (2) suitable for reading of ingot mould (1) are located is 0.10～0.18 with the ratio of ingot mould external diameter, and the ingot mould thickness that end opening (3) is located is 0.12～0.20 with the ratio of ingot mould external diameter.
3. the ingot mould of production round ingot as claimed in claim 1 or 2 is characterized in that: the internal diameter tapering of described ingot mould (1) is 0～0.5%.
4. the ingot mould of production round ingot as claimed in claim 1 is characterized in that: the inwall in (2) suitable for reading of ingot mould (1) is equipped with ring-type heat-insulating shield (5).
5. the ingot mould of production round ingot as claimed in claim 4 is characterized in that: an internal diameter is installed at least greater than heat-insulating shield (4) under the ring-type of heat-insulating shield (5) internal diameter on the inwall of the ingot mould (1) below heat-insulating shield (5).
6. the ingot mould of production round ingot as claimed in claim 4 is characterized in that: described heat-insulating shield (5) is the taper of top internal diameter less than the bottom internal diameter.
7. the ingot mould of production round ingot as claimed in claim 1 is characterized in that: the chemical composition of described ingot mould comprises C 3.1～3.5%, and Si 1.0～1.5%, and Mn 1.5～2.1%, P≤0.15%, and S≤0.10%, all the other are Fe.
8. produce the casting method of round ingot, adopting inner chamber is circular ingot mould, is the method for making a bet during casting, it is characterized in that: steel ingot ingot body casting linear velocity is 100～180mm/min, and cap portion interstitial wire speed is 40～90mm/min.
9. the casting method of production round ingot as claimed in claim 8 is characterized in that: molten steel overheat is 30～55 ℃ during casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102032280A CN101195153A (en) | 2007-12-19 | 2007-12-19 | Ingot case for producing round ingot and casting method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007102032280A CN101195153A (en) | 2007-12-19 | 2007-12-19 | Ingot case for producing round ingot and casting method thereof |
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| CN101195153A true CN101195153A (en) | 2008-06-11 |
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| CNA2007102032280A Pending CN101195153A (en) | 2007-12-19 | 2007-12-19 | Ingot case for producing round ingot and casting method thereof |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231029A (en) * | 2013-05-13 | 2013-08-07 | 山西太钢不锈钢股份有限公司 | Pouring method for large-section consumable electrode |
| CN103240395A (en) * | 2013-05-20 | 2013-08-14 | 聊城市新联机械有限公司 | Self-cooled moulding steel moulds for casting steel ingots |
| CN103252461A (en) * | 2013-05-13 | 2013-08-21 | 山西太钢不锈钢股份有限公司 | Method for pouring electrode billet |
| CN103639365A (en) * | 2013-12-12 | 2014-03-19 | 江苏精工特种材料有限公司 | Combined type special steel casting die |
| CN104249132A (en) * | 2013-06-26 | 2014-12-31 | 江苏天工工模具钢工程技术研究中心有限公司 | Steel ingot mould |
| CN104308097A (en) * | 2014-10-17 | 2015-01-28 | 江苏联峰能源装备有限公司 | Novel ingot mold for enhancing quality and increasing utilization ratio of steel ingot |
| CN104550788A (en) * | 2014-12-27 | 2015-04-29 | 江苏苏南重工机械科技有限公司 | Steel ingot stretch-breaking method |
| CN104889350A (en) * | 2015-06-26 | 2015-09-09 | 攀钢集团成都钢钒有限公司 | Round ingot die and round ingot manufacturing method |
| CN107130118A (en) * | 2017-05-02 | 2017-09-05 | 中信重工机械股份有限公司 | A kind of running gate system of large-scale circular section consutrode and preparation method thereof |
| CN112605351A (en) * | 2020-11-13 | 2021-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving internal quality of cast ingot and heating and heat-insulating box |
| CN114406212A (en) * | 2021-12-27 | 2022-04-29 | 舞阳钢铁有限责任公司 | Production method of steel ingot with built-in high utilization rate of heat-insulating plate |
-
2007
- 2007-12-19 CN CNA2007102032280A patent/CN101195153A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103231029A (en) * | 2013-05-13 | 2013-08-07 | 山西太钢不锈钢股份有限公司 | Pouring method for large-section consumable electrode |
| CN103252461A (en) * | 2013-05-13 | 2013-08-21 | 山西太钢不锈钢股份有限公司 | Method for pouring electrode billet |
| CN103240395A (en) * | 2013-05-20 | 2013-08-14 | 聊城市新联机械有限公司 | Self-cooled moulding steel moulds for casting steel ingots |
| CN103240395B (en) * | 2013-05-20 | 2015-12-23 | 张宪 | A kind of teeming self-cooled shaping steel die |
| CN104249132A (en) * | 2013-06-26 | 2014-12-31 | 江苏天工工模具钢工程技术研究中心有限公司 | Steel ingot mould |
| CN103639365A (en) * | 2013-12-12 | 2014-03-19 | 江苏精工特种材料有限公司 | Combined type special steel casting die |
| CN104308097A (en) * | 2014-10-17 | 2015-01-28 | 江苏联峰能源装备有限公司 | Novel ingot mold for enhancing quality and increasing utilization ratio of steel ingot |
| CN104550788A (en) * | 2014-12-27 | 2015-04-29 | 江苏苏南重工机械科技有限公司 | Steel ingot stretch-breaking method |
| CN104889350A (en) * | 2015-06-26 | 2015-09-09 | 攀钢集团成都钢钒有限公司 | Round ingot die and round ingot manufacturing method |
| CN107130118A (en) * | 2017-05-02 | 2017-09-05 | 中信重工机械股份有限公司 | A kind of running gate system of large-scale circular section consutrode and preparation method thereof |
| CN112605351A (en) * | 2020-11-13 | 2021-04-06 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for improving internal quality of cast ingot and heating and heat-insulating box |
| CN114406212A (en) * | 2021-12-27 | 2022-04-29 | 舞阳钢铁有限责任公司 | Production method of steel ingot with built-in high utilization rate of heat-insulating plate |
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Open date: 20080611 |