CN106141109A - A kind of die casting method - Google Patents

A kind of die casting method Download PDF

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Publication number
CN106141109A
CN106141109A CN201610513165.8A CN201610513165A CN106141109A CN 106141109 A CN106141109 A CN 106141109A CN 201610513165 A CN201610513165 A CN 201610513165A CN 106141109 A CN106141109 A CN 106141109A
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CN
China
Prior art keywords
ingot
rod iron
cold burden
molding
steel
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610513165.8A
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Chinese (zh)
Inventor
脱臣德
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Valin Xiangtan Iron and Steel Co Ltd
Hunan Hualing Xiangtan Iron and Steel Co Ltd
Original Assignee
Hunan Hualing Xiangtan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hunan Hualing Xiangtan Iron and Steel Co Ltd filed Critical Hunan Hualing Xiangtan Iron and Steel Co Ltd
Priority to CN201610513165.8A priority Critical patent/CN106141109A/en
Publication of CN106141109A publication Critical patent/CN106141109A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D7/00Casting ingots, e.g. from ferrous metals
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/02Ferrous alloys, e.g. steel alloys containing silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C38/00Ferrous alloys, e.g. steel alloys
    • C22C38/04Ferrous alloys, e.g. steel alloys containing manganese

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Continuous Casting (AREA)

Abstract

A kind of die casting method, comprises the technical steps that: (1) rod iron cold burden is chosen: rod iron cold burden percent mass consists of C=0.44~0.46, Si=0.19~0.23, Mn=0.54~0.57, P≤0.022, S%≤0.019, rod iron cold burden liquidus curve enters mold temperature more than 30 DEG C less than pre-cast molten steel;(2) rod iron processes: rod iron is after rust cleaning processing, and in moulded steel ingot mould, centered by steel ingot width, each 1/4 ingot shape width arrangement cold burden in both sides, cold burden addition is the 0.5%~1.5% of ingot quality;(3) molding: use the molding of bet method molten steel, is cast to fix by the converter LF VD complete qualified molten steel of smelting in the ingot mould of cold burden, and molding is opened and watered the degree of superheat and control at 35 ± 1 DEG C.It is workable that the present invention smelts casting process;Small investment, equipment and technique highly versatile;Effect is notable, and the segregation degree of static ingot is substantially reduced, and metallurgical quality is greatly improved.

Description

A kind of die casting method
Technical field
The invention belongs to steel-smelting technology, be specifically related to improve a kind of die casting method of ingotism.
Technical background
Along with power industry, nuclear industry, the developing rapidly, to heavy casting and forging and the need of ultra-thick steel plates of petro chemical industry The amount of asking is increasing, works together also more and more higher to the prescription of ingot casting and steel plate.Static ingot is as heavy casting and forging and surpasses The product in advance of steel plate, its quality and utilization rate are even more important.
Generally there is ingotism problem, especially carbon segregation in static ingot of the prior art.The most right Ingotism formation mechanism study shows: in During Ingot Solidification, and high-temperature liquid metal is longer in liquid/solid two-phase section elapsed-time standards, Different according to steel ingot tonnage, several hours to up to a hundred hours.In the meantime, due to dendrite microsegregation and thermosolutal convection Common effect, makes the low melting point such as carbon, phosphorus, low-density element solute reallocate, causes steel ingot zones of different composition different.
The existence of ingotism seriously reduces the quality of steel ingot, also greatly reduces the utilization rate of steel ingot simultaneously;Due to Steel ingot zones of different chemical composition uneven, decaptitates during the measure that general steel ingot factory generally uses and truncates, only take centre The more uniform part of composition uses, and lumber recovery is relatively low so that production cost increases.Currently available technology uses low-carbon (LC) protection The measures such as slag, raising cap volume ratio, increase ingot mould depth-width ratio, make head carbon segregation problem make moderate progress, but these technology handss Section is far from meeting the market quality requirement day by day improved to product.
Summary of the invention
It is desirable to provide a kind of die casting method, the method can solve the ingotism of above-mentioned prior art existence and ask Topic.
The technical scheme of invention: a kind of die casting method, comprises the technical steps that:
(1) rod iron cold burden is chosen: rod iron cold burden percent mass consists of C=0.44~0.46, Si=0.19~0.23, Mn=0.54 ~0.57, P≤0.022, S%≤0.019, rod iron cold burden liquidus curve enters mold temperature more than 30 DEG C less than pre-cast molten steel.
(2) rod iron processes: rod iron is after rust cleaning processing, and in moulded steel ingot mould, centered by steel ingot width, both sides are each 1/4 ingot shape width arrangement cold burden, cold burden addition is the 0.5%~1.5% of ingot quality.
(3) molding: use the molding of bet method molten steel, is cast to fix by the converter LF VD complete qualified molten steel of smelting In the ingot mould of good cold burden, molding is opened and is watered the degree of superheat and control at 35 ± 1 DEG C.
Compared to the prior art die casting method of the present invention has the advantage that smelting casting process is workable;Investment Few, equipment and technique highly versatile;Effect is notable, and the segregation degree of static ingot is substantially reduced, and metallurgical quality is greatly improved.
Detailed description of the invention
It is further described present disclosure below in conjunction with embodiment.
Embodiment is a kind of die casting method that Q345D29T ingot shape inserts cold steel.
Steel ingot and ingot mould relevant parameter:
Steel ingot weight 29 tons.
Ingot mould a size of bottom 730 mm × 1968mm, top 880mm × 2017mm, highly 2480mm.
Ingot mould thickness is 280mm, bottom thickness 300mm, riser height 400mm, shrinkage hole degree of depth 400mm.
Processing step:
(1) rod iron cold burden is chosen: rod iron cold burden percent mass consists of C=0.45, Si=0.20, Mn=0.55, P=0.015, S= 0.009, remaining is Fe;Rod iron cold burden liquidus curve Tl=1495 DEG C, softening temperature Ts=1460 OC.The matter of pre-cast steel ingot in example Amount percentage composition such as table 1, pre-cast steel ingot liquidus curve and cast temperature such as table 2.
Table 1 pre-cast ingot quality percentage composition (%)
Table 2 pre-cast steel ingot liquidus curve and cast temperature (OC)
(2) rod iron processes: rod iron percent mass consists of C=0.45, Mn=0.55, and cold burden addition is controlled by 0.5%, I.e. 29t × 0.5%=145kg, carries out rust cleaning processing, a size of: Φ 20mm × 2000mm to rod iron.
Rod iron arrangement is fixing: by preparing the steel plate strip of two root length 2.4 meters before experiment, ready rod iron is welded to steel plate On band.Rod iron layout uses segmentation arrangement, centered by steel ingot width 1/2, at steel ingot away from two hem widths 3/8 to wide 1/2 position, often Spacing between root rod iron is gap 20mm between 40mm, i.e. rod iron, and often row amounts to welding 12;Steel ingot away from two hem widths 2/8 to Wide 3/8 position, spacing 60mm between every rod iron, i.e. rod iron gap 40mm, often row amounts to welding 8.Weld two rows on request, Placing spacing between two row's rod irons is 150mm.
(3) molding: test heat composition controls in strict accordance with standard internally controlling requirement, converter, refine LF, VD(RH) operation is tight Lattice are according to key points for operation control.
Embodiment 1:VD strictly controls out-station temperature, and set off the degree of superheat 41 DEG C, and molding is opened and watered Qian great Bao and carry out thermometric, controls Open and water the degree of superheat 35 DEG C;After molding is poured, test steel ingot is added a cover thermal insulation cover, it is ensured that the diffusion of ingot head carbon is uniformly.
Embodiment 2:VD strictly controls out-station temperature, and set off the degree of superheat 46 DEG C, and molding is opened and watered Qian great Bao and carry out thermometric, controls Open and water the degree of superheat 35 DEG C;After molding is poured, test steel ingot is added a cover thermal insulation cover, it is ensured that the diffusion of ingot head carbon is uniformly.
The follow-up demoulding, heap are cold and rolling mill practice is performed by normal process.
Detection results: molding is inserted cold rod iron homogenizing cooling technology and largely improved width 1/2 position segregation situation, special Head width 1/2 position carbon content time other, the most normal 250mm thickness ingot head thickness direction carbon difference is about 0.05%, test Ingotism situation is shown in Table 3, and thickness direction segregation is obviously improved.
Steel ingot maximum cross-section degree of segregation tested by table 3

Claims (1)

1. a die casting method, it is characterised in that comprise the technical steps that:
(1) rod iron cold burden is chosen: rod iron cold burden percent mass consists of C=0.44~0.46, Si=0.19~0.23, Mn=0.54 ~0.57, P≤0.022, S%≤0.019, rod iron cold burden liquidus curve enters mold temperature more than 30 DEG C less than pre-cast molten steel;
(2) rod iron processes: rod iron is after rust cleaning processing, in moulded steel ingot mould, centered by steel ingot width, and both sides each 1/4 Ingot shape width arrangement cold burden, cold burden addition is the 0.5%~1.5% of ingot quality;
(3) molding: use the molding of bet method molten steel, is cast to fix cold by the converter LF VD complete qualified molten steel of smelting In the ingot mould of material, molding is opened and is watered the degree of superheat and control at 35 ± 1 DEG C.
CN201610513165.8A 2016-07-04 2016-07-04 A kind of die casting method Pending CN106141109A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610513165.8A CN106141109A (en) 2016-07-04 2016-07-04 A kind of die casting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610513165.8A CN106141109A (en) 2016-07-04 2016-07-04 A kind of die casting method

Publications (1)

Publication Number Publication Date
CN106141109A true CN106141109A (en) 2016-11-23

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CN201610513165.8A Pending CN106141109A (en) 2016-07-04 2016-07-04 A kind of die casting method

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CN (1) CN106141109A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112974772A (en) * 2021-02-08 2021-06-18 中国第一重型机械股份公司 Method for preparing composite steel ingot
CN113584392A (en) * 2021-08-03 2021-11-02 山西太钢不锈钢股份有限公司 Free-cutting ferritic stainless steel and casting method thereof
CN116065010A (en) * 2022-12-16 2023-05-05 成都先进金属材料产业技术研究院股份有限公司 Homogenization treatment method for ultra-high strength maraging steel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57146452A (en) * 1981-03-03 1982-09-09 Kobe Steel Ltd Production of steel ingot
JPS5844949A (en) * 1981-09-09 1983-03-16 Sumitomo Metal Ind Ltd Production of steel ingot
CN101406937A (en) * 2008-11-19 2009-04-15 中国科学院金属研究所 Inner-cooling method for inhibiting gross segregation in large-sized steel ingot
CN104259441A (en) * 2014-09-22 2015-01-07 辽宁科技大学 Method for casting large-sized steel ingot with internally arranged cold core and top arranged electromagnetic field
CN104889349A (en) * 2014-03-05 2015-09-09 宝钢特钢有限公司 Production method of low macrosegregation steel ingot for large roller blank

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57146452A (en) * 1981-03-03 1982-09-09 Kobe Steel Ltd Production of steel ingot
JPS5844949A (en) * 1981-09-09 1983-03-16 Sumitomo Metal Ind Ltd Production of steel ingot
CN101406937A (en) * 2008-11-19 2009-04-15 中国科学院金属研究所 Inner-cooling method for inhibiting gross segregation in large-sized steel ingot
CN104889349A (en) * 2014-03-05 2015-09-09 宝钢特钢有限公司 Production method of low macrosegregation steel ingot for large roller blank
CN104259441A (en) * 2014-09-22 2015-01-07 辽宁科技大学 Method for casting large-sized steel ingot with internally arranged cold core and top arranged electromagnetic field

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112974772A (en) * 2021-02-08 2021-06-18 中国第一重型机械股份公司 Method for preparing composite steel ingot
CN113584392A (en) * 2021-08-03 2021-11-02 山西太钢不锈钢股份有限公司 Free-cutting ferritic stainless steel and casting method thereof
CN116065010A (en) * 2022-12-16 2023-05-05 成都先进金属材料产业技术研究院股份有限公司 Homogenization treatment method for ultra-high strength maraging steel
CN116065010B (en) * 2022-12-16 2024-09-03 成都先进金属材料产业技术研究院股份有限公司 Homogenization treatment method for ultra-high strength maraging steel

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Application publication date: 20161123