CN105154610A - Method for base iron spheroidisation in nodular cast iron production - Google Patents
Method for base iron spheroidisation in nodular cast iron production Download PDFInfo
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- CN105154610A CN105154610A CN201510059556.2A CN201510059556A CN105154610A CN 105154610 A CN105154610 A CN 105154610A CN 201510059556 A CN201510059556 A CN 201510059556A CN 105154610 A CN105154610 A CN 105154610A
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- iron
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- spheroidizing
- molten iron
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Abstract
The invention discloses a method for base iron spheroidisation in nodular cast iron production. The method comprises 1, based on molten iron weight, putting 1.2-1.3wt% of a special-purpose nodulizer Mg8Re3 into the inner side of a groove at the bottom of a foundry ladle, wherein the special-purpose nodulizer is magnesium oxide and impurity element content is strictly controlled, 2, based on the molten iron weight, uniformly covering the special-purpose nodulizer by 0.2wt% of a low-melting point covering alloy containing 25% of silicon and the balance iron, covering the surface of the covering agent with 1.0wt% of iron filings (with the same material) and carrying out spreading and tamping, and 3, when the molten iron spheroidization reaction is coming to an end, adding 0.8-1.0wt% of an inoculant into the reaction product along with streams, carrying out stream inoculation. The method solves the problem that in nodular cast iron production, the prior art has poor base iron spheroidisation effects and cannot produce high-quality nodular cast iron, and has simple production processes, a low production cost, strong practicality and a high application value.
Description
Technical field
The invention belongs to Manufacturing Technology of Nodular Cast Iron field, particularly relate to the method to base iron spheroidizing in the production of a kind of spheroidal graphite cast iron.
Background technology
The spheroidal graphite cast iron of low-temperature impact requires there is good impact property at low temperatures, and its body interior specification of quality is very high, how to obtain its properties requirement and can stably manufactured be the difficult point of material produce.
The energy that absorbs during impelling strength reflection Materials Fracture, under also reflecting quick deformation condition, the ability of material repels crack initiation, development and fracture.Low-temperature impact toughness is the toughness index of a material, that is has and has higher impact toughness compared with the nodular iron casting of high/low-temperature impact toughness-50 DEG C time, crisp--tough performance transition temperature is lower, can overcome cold short preferably.
Materials Fracture is transcrystalline or grain boundary fracture often, inner or the intercrystalline of material grains has and is mingled with or inclusion, weaken the linkage force of material, under impact loading, often be formed as formation of crack, or the approach of crack propagation, reduce the low-temperature impact-resistant ability of material, and material grains is inner or intercrystalline Slag inclusion is caused by the oxide compound of excessive residual Mg and residual Re, sulfide.
Summary of the invention
The invention provides the method to base iron spheroidizing in the production of a kind of spheroidal graphite cast iron, be intended to solve in spheroidal graphite cast iron production, the spheroidizing effect of prior art to base iron is undesirable, without the problem producing high-quality spheroidal graphite cast iron.
Method to base iron spheroidizing in the spheroidal graphite cast iron production that the object of the present invention is to provide, this spheroidal graphite cast iron comprises the following steps the method for base iron spheroidizing in producing:
Step one, by Special ball agent Mg
8re
3put in hot metal ladle, Special ball agent Mg
8re
3account for the 1.2%-1.3% of weight of molten iron;
Step 2, adopt low melting point account for weight of molten iron 0.2% cover Special ball agent containing 25% silicon is remaining for iron covering alloy, and tamping is paved on the surface adopting the iron filings accounting for weight of molten iron 1.0% to cover insulating covering agent, makes sure to keep in mind not handy skim agent and covers;
Step 3, requires during molten iron discharging that large mouth taps a blast furnace, and spheroidizing reacion controls to start as Best Times at required molten iron 2/3, and when liquid iron balling reaction closes to an end, the nucleating agent adding 0.8-1.0% with stream carries out current-following inoculation.
Further, in step 3, the time controling of liquid iron balling reaction is in 60-80 second;
Further, in step 3, in the whole casting process of liquid iron balling reaction, molten iron surface granularity 50-100 object volcanic ash gathers slag agent and covers.
Method to base iron spheroidizing in spheroidal graphite cast iron production provided by the invention, puts into inside groove at the bottom of hot metal ladle by Special ball agent Mg8Re3; Adopt 0.2% covering alloy of low melting point to cover low silicon Special ball agent Mg8Re3, and tamping is paved on the surface adopting the iron filings of 1.0% to cover base iron; Require during molten iron discharging that large mouth taps a blast furnace, spheroidizing reacion controls to start as Best Times at required molten iron 2/3, and when liquid iron balling reaction closes to an end, the nucleating agent adding 0.8-1.0% with stream carries out current-following inoculation; In the whole casting process of liquid iron balling reaction, the poly-slag agent in molten iron surface covers, and poly-slag agent adopts volcanic ash skim agent; Solve the spheroidizing effect of prior art to base iron in spheroidal graphite cast iron production undesirable, without the problem producing high-quality spheroidal graphite cast iron, production technique is simple, and production cost is lower, practical, has stronger propagation and employment and is worth.
Accompanying drawing explanation
Fig. 1 is the realization flow figure to the method for base iron spheroidizing during the spheroidal graphite cast iron that provides of the embodiment of the present invention is produced.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is described in further detail.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and be not used in restriction invention.
Fig. 1 show spheroidal graphite cast iron that the embodiment of the present invention provides produce in realization flow to the method for base iron spheroidizing.
The method comprises the following steps:
S101: by Special ball agent Mg
8re
3put into inside groove at the bottom of hot metal ladle; The content of magnesia that Special ball agent refers to, impurity content are extremely low;
S102: what adopt 0.2% (weight of molten iron) covering alloy of low melting point (being iron more than 25% silicon) covers Special ball agent, and tamping is paved on the surface adopting the iron filings of 1.0% (weight of molten iron) to cover insulating covering agent;
S103: require that large mouth treats molten iron discharging rapidly, liquid iron balling reaction start to control in 2/3 (required weight of molten iron) of tapping a blast furnace, treat by the end of, the nucleating agent adding 0.8-1.0% with stream carries out current-following inoculation.
In step s 103, the time controling of liquid iron balling reaction is in 60-80 second;
In the whole casting process of liquid iron balling reaction, the poly-slag agent in molten iron surface covers (volcanic ash, granularity 50-100 order);
Poly-slag agent adopts volcanic ash, and this poly-slag agent spreadability is good, well molten iron and air insulated, prevents molten iron oxidation from going bad.
Method to base iron spheroidizing in spheroidal graphite cast iron production provided by the invention, puts into Special ball agent Mg8Re3 (1.2-1.3% weight of molten iron) inside at the bottom of nodularization bag; Adopt 0.2% covering alloy of low melting point to cover Special ball agent, and adopt the surface of the iron filings ball covering on soil agent of 1.0% to pave tamping; Require that large mouth treats molten iron discharging rapidly, liquid iron balling reaction starts to control in 2/3 (required weight of molten iron) of tapping a blast furnace, and when liquid iron balling reaction closes to an end, the nucleating agent adding 0.8-1.0% with stream carries out current-following inoculation; In the whole casting process of liquid iron balling reaction, the poly-slag agent in molten iron surface covers, and poly-slag agent adopts volcanic ash; Solve in spheroidal graphite cast iron production, the spheroidizing effect of prior art to base iron is undesirable, and without the problem producing high-quality spheroidal graphite cast iron, production technique is simple, and production cost is lower, practical, has stronger propagation and employment and is worth.
Below in conjunction with drawings and the specific embodiments, application principle of the present invention is further described.
Spheroidizing is very crucial, Oxygen potential > 90%, and spheroidizing reacion time controling is too short causes magnesium and the serious nodularization failure of rare earth scaling loss, otherwise long spheroidization molten iron is lowered the temperature seriously and affected the absorption of magnesium and rare earth.Nodulizing agent add-on suitably can adjust according to the sulphur content of base iron, (but prerequisite must base iron sulphur content≤0.02) nodulizing agent add-on too much cause residual magnesium and rare earth excessive; Cross and cause nodularization failure at least.Nodulizing agent adopts Special ball agent Mg
8re
3, object increases innoculant adding quantity reinforced ferrite and increases the number of graphite, controls residual Mg and Re, if residual Mg, Re exceed standard, Yin Qiyi forms Mg
2siO
3or MgSiO
4graphite morphology can be made to affect grade; Spheroidizing adopts 0.2% covering alloy of low melting point to cover nodulizing agent (object wraps up nodulizing agent rapidly, pelletized reaction retarted reaction after meeting high temperature liquid iron).Then use 1.0% iron filings (same to material) to cover and prevent molten iron from reacting too fast, spheroidizing reacion keeps 60-80 second, and current-following inoculation treats that liquid iron balling reacts the Shi Suiliu that closes to an end and adds 0.8-1.0%.
Whole casting process surface covers the most handy skim agent with poly-slag agent and covers.
Method to base iron spheroidizing in the spheroidal graphite cast iron production that the embodiment of the present invention provides, by Special ball agent Mg
8re
3put into inside groove at the bottom of base iron bag; 0.2% covering alloy of low melting point is adopted to cover Special ball agent Mg
8re
3, and tamping is paved on the surface adopting the iron filings of 1.0% to cover base iron; When liquid iron balling reaction closes to an end, the nucleating agent adding 0.8-1.0% with stream carries out current-following inoculation; In the whole casting process of liquid iron balling reaction, the poly-slag agent in molten iron surface covers, and poly-slag agent adopts plant ash; Solve in spheroidal graphite cast iron production, the spheroidizing effect of prior art to base iron is undesirable, and without the problem producing high-quality spheroidal graphite cast iron, production technique is simple, and production cost is lower, practical, has stronger propagation and employment and is worth.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the method to base iron spheroidizing in spheroidal graphite cast iron production, it is characterized in that, this spheroidal graphite cast iron comprises the following steps the method for base iron spheroidizing in producing:
Step one, by Special ball agent Mg
8re
3put into inside groove at the bottom of hot metal ladle, Special ball agent Mg
8re
3account for the 1.2%-1.3% of weight of molten iron;
Step 2, adopt low melting point account for weight of molten iron 0.2% cover Special ball agent containing 25% silicon is remaining for iron covering alloy, and tamping is paved on the surface adopting the iron filings accounting for weight of molten iron 1.0% to cover insulating covering agent;
Step 3, requires during molten iron discharging that large mouth taps a blast furnace, and spheroidizing reacion starts to control to start as Best Times at required molten iron 2/3, when liquid iron balling reaction closes to an end, carries out current-following inoculation with the nucleating agent that funnel adds 0.8-1.0% with stream.
2. spheroidal graphite cast iron as claimed in claim 1 produce in method to base iron spheroidizing, it is characterized in that, in step 3, the time controling of liquid iron balling reaction is in 60-80 second.
3. the method to base iron spheroidizing in spheroidal graphite cast iron production as claimed in claim 1, is characterized in that, in step 3, in the whole casting process of liquid iron balling reaction, molten iron surface granularity 50-100 object volcanic ash gathers slag agent and covers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510059556.2A CN105154610A (en) | 2015-02-04 | 2015-02-04 | Method for base iron spheroidisation in nodular cast iron production |
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|---|---|---|---|
| CN201510059556.2A CN105154610A (en) | 2015-02-04 | 2015-02-04 | Method for base iron spheroidisation in nodular cast iron production |
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| CN105154610A true CN105154610A (en) | 2015-12-16 |
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ID=54795651
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| CN201510059556.2A Pending CN105154610A (en) | 2015-02-04 | 2015-02-04 | Method for base iron spheroidisation in nodular cast iron production |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862416A (en) * | 2021-09-02 | 2021-12-31 | 山西清慧胜凯科技股份有限公司 | Preparation method of low-temperature high-toughness nodular cast iron |
| CN113862415A (en) * | 2021-09-02 | 2021-12-31 | 山西清慧胜凯科技股份有限公司 | Spheroidizing method for low-temperature high-toughness nodular cast iron |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403068A (en) * | 2008-11-06 | 2009-04-08 | 徐宏亮 | Austenite spheroidal iron and producing method thereof |
| CN102337448A (en) * | 2011-10-25 | 2012-02-01 | 青岛和德隆机械有限公司 | Raw material composition for producing high-performance nodular cast iron valve and production method thereof |
| CN102936680A (en) * | 2012-09-11 | 2013-02-20 | 青岛和德隆机械有限公司 | Raw material composition of high performance sewage discharge valve cast, and production method thereof |
| CN103418757A (en) * | 2012-05-16 | 2013-12-04 | 陈硕 | Multiple processing of molten iron of nodular cast iron |
-
2015
- 2015-02-04 CN CN201510059556.2A patent/CN105154610A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101403068A (en) * | 2008-11-06 | 2009-04-08 | 徐宏亮 | Austenite spheroidal iron and producing method thereof |
| CN102337448A (en) * | 2011-10-25 | 2012-02-01 | 青岛和德隆机械有限公司 | Raw material composition for producing high-performance nodular cast iron valve and production method thereof |
| CN103418757A (en) * | 2012-05-16 | 2013-12-04 | 陈硕 | Multiple processing of molten iron of nodular cast iron |
| CN102936680A (en) * | 2012-09-11 | 2013-02-20 | 青岛和德隆机械有限公司 | Raw material composition of high performance sewage discharge valve cast, and production method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113862416A (en) * | 2021-09-02 | 2021-12-31 | 山西清慧胜凯科技股份有限公司 | Preparation method of low-temperature high-toughness nodular cast iron |
| CN113862415A (en) * | 2021-09-02 | 2021-12-31 | 山西清慧胜凯科技股份有限公司 | Spheroidizing method for low-temperature high-toughness nodular cast iron |
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Application publication date: 20151216 |