CN111250678A - Production process of die-cast steel ingot for reducing flaw detection defects - Google Patents
Production process of die-cast steel ingot for reducing flaw detection defects Download PDFInfo
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- CN111250678A CN111250678A CN202010219201.6A CN202010219201A CN111250678A CN 111250678 A CN111250678 A CN 111250678A CN 202010219201 A CN202010219201 A CN 202010219201A CN 111250678 A CN111250678 A CN 111250678A
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- steel
- flaw detection
- ingot
- die
- covering slag
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D37/00—Controlling or regulating the pouring of molten metal from a casting melt-holding vessel
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- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses a process for producing a die-cast steel ingot for reducing flaw detection defects, which comprises the following steps: step S1: setting the weight proportion of the covering slag, and packaging the covering slag according to the weight proportion; step S2: hoisting the packaged covering slag into a steel ingot mold; step S3: and carrying out molten steel pouring to obtain a steel ingot. The production process of the die-cast steel ingot for reducing the flaw detection defects adopts the slag hanging method to add the covering slag, has simple process and convenient control, has the effective standard reaching rate of more than or equal to 95 percent, can effectively control the slag inclusion flaw detection defects of the forging material, and has good application prospect.
Description
Technical Field
The invention relates to the field of steel ingot production processes, in particular to a process for producing a die-cast steel ingot for reducing flaw detection defects.
Background
With the current steel market competition becoming more and more intense, the inherent quality of steel greatly affects the service life of relevant manufactured products, wherein, flaw detection indexes are taken as an important basis for judging the inherent quality, and the market is highly regarded in recent years.
In addition, the flaw detection requirements of various steel grades such as bonding steel, die steel, stainless steel and the like are continuously improved, the flaw detection standard requirements are greatly upgraded from the grade 2 of the GB/T6402-2008 standard to the grade B of the GB/T4162-2008 standard or the grade 4 of the GB/T6402-2008 standard, and the first-time flaw detection yield of steel products produced by a steel mill is greatly reduced. In the current market environment, steel mills need to stand and survive, the internal quality of steel products needs to be improved, the process cost needs to be reduced, and the primary qualification rate of flaw detection is emphasized.
Therefore, how to improve the quality of steel and the first-time qualification rate of flaw detection is a technical problem to be solved by technical personnel in the field at present.
Disclosure of Invention
The invention aims to provide a process for producing a die-cast steel ingot for reducing flaw detection defects, which is used for improving the quality of steel, reducing the production cost and improving the first-time qualification rate of flaw detection.
In order to achieve the purpose, the invention provides the following technical scheme:
a process for producing a die-cast steel ingot for reducing flaw detection defects comprises the following steps:
step S1: setting the weight proportion of the covering slag, and packaging the covering slag according to the weight proportion;
step S2: hoisting the packaged covering slag into a steel ingot mold;
step S3: and carrying out molten steel pouring to obtain a steel ingot.
Preferably, in the step S1, the weight ratio of the mold flux is 2.5 to 3kg/t of the weight of the steel.
Preferably, in the step S1, the number of the packages of the mold flux is not less than the number of the ingot mold.
Preferably, the step S2 specifically includes:
and hoisting the packaged covering slag into a steel ingot mold by using a hoisting part.
Preferably, the hoisting part is a cotton rope.
Preferably, the step S2 specifically includes:
and hoisting the packaged covering slag into the steel ingot mold, wherein the distance between the covering slag and the bottom of the steel ingot mold is 150-250 mm.
Preferably, the step S3 includes:
step S3-1: adjusting a ladle nozzle to the maximum size;
step S3-2: and pouring the molten steel, and gradually closing the size of the ladle nozzle after the molten steel enters the ingot mould until the pouring speed reaches a target speed.
Preferably, the maximum size of the ladle nozzle is 50-60 mm.
Preferably, after the molten steel is poured, the molten steel is flushed into a low-temperature pouring pipe and a runner brick.
Preferably, the steel is a forged steel with a diameter of 250-600 mm.
The invention provides a process for producing a die-cast steel ingot for reducing flaw detection defects, which comprises the following steps: step S1: setting the weight proportion of the covering slag, and packaging the covering slag according to the weight proportion; step S2: hoisting the packaged covering slag into a steel ingot mold; step S3: and carrying out molten steel pouring to obtain a steel ingot. The production process of the die-cast steel ingot for reducing the flaw detection defects adopts the slag hanging method to add the covering slag, has simple process and convenient control, has the effective standard reaching rate of more than or equal to 95 percent, can effectively control the slag inclusion flaw detection defects of the forging material, and has good application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of one embodiment of a process for producing a cast steel ingot for reducing flaw detection defects provided by the present invention;
FIG. 2 is a high magnification photograph multiplied by 100 times of positioning sample (slag inclusion) of 3CrNi2MoVA steel;
FIG. 3-1 is a transverse photograph of a low power proof-reading of 16Mn steel;
FIG. 3-2 is a transverse photograph of the loose hole morphology of 16Mn steel;
FIGS. 3-3 are longitudinal photographs of the appearance of the porosity band cracks of the 16Mn steel.
Detailed Description
The core of the invention is to provide a process for producing the die-cast steel ingot for reducing flaw detection defects, which can improve the quality of steel, reduce the production cost and improve the first-time qualification rate of flaw detection.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 3, fig. 1 is a flow chart of an embodiment of a process for producing a cast steel ingot for reducing flaw detection according to the present invention; FIG. 2 is a high magnification photograph multiplied by 100 times of positioning sample (slag inclusion) of 3CrNi2MoVA steel; FIG. 3-1 is a transverse photograph of a low power proof-reading of 16Mn steel; FIG. 3-2 is a transverse photograph of the loose hole morphology of 16Mn steel; FIGS. 3-3 are longitudinal photographs of the appearance of the porosity band cracks of the 16Mn steel.
In this embodiment, a process for producing a cast ingot for reducing flaw detection defects, comprising the steps of:
step S1: setting the weight proportion of the covering slag, and packaging the covering slag according to the weight proportion; the weight proportion of the covering slag is preferably 2.5-3 kg/t of steel weight, namely 2.5-3 kg of covering slag is correspondingly packaged per ton of steel, so the weight of the covering slag is calculated according to the total weight of the steel;
step S2: hoisting the packaged covering slag into a steel ingot mold; specifically, the packaged covering slag can be hoisted into a steel ingot mold by adopting a hoisting part; further, the one end at hoisting parts is hung to the covering slag that packs, and hoisting parts's the other end can be connected on the bracing piece, and the bracing piece is transversely placed on the upper portion of ingot mould, and the length of bracing piece should be greater than the opening size of ingot mould, and is concrete, when having a plurality of ingot moulds, can adopt same bracing piece, conveniently places.
Step S3: and carrying out molten steel pouring to obtain a steel ingot.
Further, when the covering slag is packaged, the covering slag needs to be packaged according to the number of the steel ingot molds, and the packaging number of the covering slag is not less than the number of the steel ingot molds.
In addition to the above embodiments, step S2 specifically includes:
and hoisting the packaged covering slag into the steel ingot mold by using a cotton rope.
In addition to the above embodiments, step S2 specifically includes:
and hoisting the packaged protective slag into the steel ingot mold until the distance between the protective slag and the bottom of the steel ingot mold is 150-250 mm.
Specifically, after the covering slag is subpackaged according to weight, the covering slag is hung into the ingot mold by a cotton rope at a preset height from the bottom of the ingot mold. Wherein the preset height is preferably 150-250 mm.
It should be noted here that if the mold flux is too close to the bottom of the ingot mold, the flow rate of the molten steel stream during casting is too fast and unstable, causing the mold flux to be entrained in the molten steel, and the defect of flaw detection of inclusion type, as shown in fig. 2; if the mold flux is too far from the bottom of the ingot mold, the following two problems occur:
a) if the cotton rope is broken at high temperature, the covering slag falls into the molten steel, so that the liquid level of the molten steel fluctuates, slag is rolled, and the defect of incomplete slag inclusion flaw detection occurs; b) if the cotton rope is not broken, the adding time of the covering slag is late, and the surface quality of the steel ingot is poor.
In addition to the above embodiments, step S3 includes:
step S3-1: adjusting a ladle nozzle to the maximum size;
step S3-2: and pouring molten steel, and gradually closing the size of a ladle nozzle after the molten steel enters the ingot mold until the pouring speed reaches the target speed.
Specifically, the steel ingot is cast, the ladle nozzle is fully opened, and after the molten steel enters the steel ingot mold, the ladle nozzle is stably closed and adjusted to the specified speed of ingot body casting. By adopting the process, on one hand, the ladle nozzle is fully opened, and the molten steel rushes into the low-temperature pouring pipe and the runner brick, so that the dead pouring is avoided; on the other hand, after the molten steel enters the ingot mould, the water gap of the steel ladle is stably closed, the corresponding specified speed of the ingot body pouring is adjusted to be completed within the specified time, and the defect of loose flaw detection mismatching caused by too fast pouring speed is avoided, as shown in fig. 3-1, fig. 3-2 and fig. 3-3.
Further, the maximum size of the ladle nozzle is 50-60mm, and is preferably 55 mm.
On the basis of the above embodiments, the steel material is a forged material with a diameter of 250-.
In a specific embodiment, the process for producing a die-cast steel ingot comprises the following steps: according to the size of the ingot mold, after covering slag is respectively packaged according to the weight of 2.5-3 kg/t steel, the covering slag is hung into the ingot mold by a cotton rope at the height of 150-250mm from the bottom of the ingot mold; the size of a ladle nozzle is 55mm, steel ingots are cast, the ladle nozzle is fully opened, and after molten steel enters an ingot mold, the ladle nozzle is manually and stably closed and adjusted to the specified speed of ingot body casting.
In the embodiment, a manufacturing method for reducing slag inclusion flaw detection defects of a large forging material by adopting a process of adding covering slag by a slag hanging method is adopted, so that the forging material with the specification of phi 250-600mm can reach the flaw detection standard GB/T4162-2008B grade or GB/T6402-20084 grade.
The process for producing a die-cast steel ingot for reducing flaw detection defects provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. A process for producing a die-cast steel ingot for reducing flaw detection defects is characterized by comprising the following steps:
step S1: setting the weight proportion of the covering slag, and packaging the covering slag according to the weight proportion;
step S2: hoisting the packaged covering slag into a steel ingot mold;
step S3: and carrying out molten steel pouring to obtain a steel ingot.
2. The process for producing a die-cast steel ingot for reducing flaw detection defects according to claim 1, wherein in the step S1, the weight ratio of the mold flux is 2.5-3 kg/t of the weight of the steel.
3. The process for producing a die-cast ingot for reducing flaw detection defects according to claim 2, wherein the number of packages of the mold flux is not less than the number of the ingot mold in the step S1.
4. The process for producing a die-cast ingot for reducing flaw detection defects according to claim 1, wherein the step S2 is specifically:
and hoisting the packaged covering slag into a steel ingot mold by using a hoisting part.
5. The process for producing a die-cast ingot for reducing inspection defects according to claim 4, wherein the lifting member is a cotton rope.
6. The process for producing a die-cast ingot for reducing flaw detection defects according to any one of claims 1 to 5, wherein the step S2 is specifically:
and hoisting the packaged covering slag into the steel ingot mold, wherein the distance between the covering slag and the bottom of the steel ingot mold is 150-250 mm.
7. The process for producing a die-cast ingot for reducing flaw detection defects according to any one of claims 1 to 5, wherein the step S3 includes:
step S3-1: adjusting a ladle nozzle to the maximum size;
step S3-2: and pouring the molten steel, and gradually closing the size of the ladle nozzle after the molten steel enters the ingot mould until the pouring speed reaches a target speed.
8. The process for producing a die cast ingot for reducing flaw detection defects according to claim 8, wherein the ladle nozzle has a maximum dimension of 50-60 mm.
9. The process for producing a die-cast steel ingot for reducing flaw detection defects according to claim 8, wherein after the molten steel is poured, the molten steel is poured into a low-temperature tundish and a runner block.
10. A process for the production of a die-cast ingot for reducing flaw detection defects according to any one of claims 1 to 5, wherein the steel material is a forged steel material having a diameter of 250 to 600 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010219201.6A CN111250678A (en) | 2020-03-25 | 2020-03-25 | Production process of die-cast steel ingot for reducing flaw detection defects |
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| CN202010219201.6A CN111250678A (en) | 2020-03-25 | 2020-03-25 | Production process of die-cast steel ingot for reducing flaw detection defects |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160777A (en) * | 2021-12-07 | 2022-03-11 | 安徽林洪重工科技有限公司 | Steel ingot covering slag adding method capable of effectively controlling slag rolling |
Citations (7)
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| JPS528245B1 (en) * | 1968-11-12 | 1977-03-08 | ||
| CN2180361Y (en) * | 1993-12-30 | 1994-10-26 | 鞍山钢铁公司 | Hanging tool for protecting slag ladle of ingot casting |
| CN101716659A (en) * | 2009-11-28 | 2010-06-02 | 山西太钢不锈钢股份有限公司 | Method for mold casting of molten steel |
| CN101850418A (en) * | 2009-04-01 | 2010-10-06 | 辽宁科技大学 | Pourable top casting type device for casting directional solidified steel ingot |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| CN110090934A (en) * | 2018-01-31 | 2019-08-06 | 宝山钢铁股份有限公司 | A method of it prevents molding bet from opening and pours molten steel splash and slag |
| US20190322581A1 (en) * | 2016-06-30 | 2019-10-24 | Refratechnik Holding Gmbh | Insulating, refractory molded body, especially plate, and process for its manufacture and its usage |
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2020
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Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS528245B1 (en) * | 1968-11-12 | 1977-03-08 | ||
| CN2180361Y (en) * | 1993-12-30 | 1994-10-26 | 鞍山钢铁公司 | Hanging tool for protecting slag ladle of ingot casting |
| CN101850418A (en) * | 2009-04-01 | 2010-10-06 | 辽宁科技大学 | Pourable top casting type device for casting directional solidified steel ingot |
| CN101716659A (en) * | 2009-11-28 | 2010-06-02 | 山西太钢不锈钢股份有限公司 | Method for mold casting of molten steel |
| CN104985143A (en) * | 2015-06-10 | 2015-10-21 | 山西太钢不锈钢股份有限公司 | Mold casting method |
| US20190322581A1 (en) * | 2016-06-30 | 2019-10-24 | Refratechnik Holding Gmbh | Insulating, refractory molded body, especially plate, and process for its manufacture and its usage |
| CN110090934A (en) * | 2018-01-31 | 2019-08-06 | 宝山钢铁股份有限公司 | A method of it prevents molding bet from opening and pours molten steel splash and slag |
Non-Patent Citations (1)
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114160777A (en) * | 2021-12-07 | 2022-03-11 | 安徽林洪重工科技有限公司 | Steel ingot covering slag adding method capable of effectively controlling slag rolling |
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Application publication date: 20200609 |