CN101497956A - Big section ferrite magnesium iron and preparation technique thereof - Google Patents
Big section ferrite magnesium iron and preparation technique thereof Download PDFInfo
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Abstract
The invention discloses large cross-section ferritic spheroidal graphite cast iron and also a preparation process thereof. According to the technical schemes, the large cross-section ferritic spheroidal graphite cast iron contains the following components according to percentages by weight: 3.6-3.9 percent of C, 1.7-3.0 percent of Si, 0.1-0.4 percent of Mn, 0.035-0.050 percent of Mg, 0.002-0.004 percent of Sb, and impurity elements of P and S, wherein the content of P in the impurity elements is controlled to be less than or equal to 0.040 percent, the content of S in the impurity elements is controlled to be less than or equal to 0.015 percent, and the rest is iron. In the invention, the extension ratio and the impact value reach and exceed the standard requirement values; in addition, the tension strength and the yield strength can also be ensured to reach requirements, and the preparation method is simple and easy.
Description
Technical field
The invention discloses a kind of big section ferrite magnesium iron, the invention also discloses a kind of preparation technology of big section ferrite magnesium iron.
Background technology
Wind energy is renewable energy source and green energy resource, is widely used and ripe in European wind energy, domesticly develops wind energy energetically since 04 year, and country supports wind-power electricity generation project just energetically.Large-scale wind electricity is a thick and large section casting parts with wheel hub etc., and thickness large section ball iron piece is very slow because of speed of cooling, and setting time is long, and graphite pebbles distorts easily, and the toughness of magnesium iron spare, plasticity are reduced greatly.Performance is as judging the qualified foundation of material, and not only performance will reach requirement now, and graphite form and matrix have also been had higher requirement.This just impels us to come to reach performance when improving graphite form by melting technology research.
(1) for the large-section magnesium iron foundry goods for improving graphite form, improve the nodularization rate, to add Sb be 0.006%～0.010% to domestic and international sophisticated technology in order to adopt.Adding Sb through evidence is 0.006%～0.008% o'clock, because Sb can make the perlite quantity in the background structure of nodular cast iron increase, so (unit elongation 〉=12%, average low-temperature impact work 〉=10J) demanding wind-powered electricity generation class foundry goods is inapplicable for toughness.The wind-powered electricity generation foundry goods adopts the magnesium iron material of ferrite matrix, the matrix of spheroidal graphite cast iron is generally based on ferrite, allow a small amount of perlite, ferritic content is less than 10% in the magnesium iron general requirement matrix of ferrite matrix, and large-scale wind generating adopts ferritic spheroidal graphite cast iron to require ferrite content to be no more than 7%.
(2) particularly iron quality is good for external starting material, generally adopts the Canadian pig iron and the Australian pig iron, and its trace element and harmful element are more much lower than the domestic pig iron.Higher relatively in the domestic starting material to the deleterious impurity element of nodularization, must add proper amount of rare-earth, but rare earth easily produces the graphite variation, adds after a certain amount of Sb, antimony and rare earth reach balance, reduce rare earth and have the graphite morphology variation that causes.
(3) company adopts cupola furnace and electric furnace double melting, utilize the normal scaling loss of cupola furnace, impurity content descends in the base iron, after desulfurization is handled, S content lower (S＜0.015%), thereby we adopt the nodulizing agent of low content of rare earth to carry out spheroidizing.Because Sb is used for the balance rare earth to cause the tendency of graphite pebbles variation, so the nodulizing agent of low content of rare earth can make the add-on of Sb also reduce.
Summary of the invention
One of purpose of the present invention is to overcome the deficiencies in the prior art, provides a kind of unit elongation and impact value to meet and exceed standard-required value and assurance tensile strength and yield strength and has also reached the big section ferrite magnesium iron that requires.
Another object of the present invention provides a kind of preparation technology of above-mentioned ferritic spheroidal graphite cast iron.
According to technical scheme provided by the invention, the each component that comprises following weight percentage in the described big section ferrite magnesium iron: C content is 3.6%～3.9%, and Si content is 1.7%～3.0%, and Mn content is 0.1%～0.4%, Mg content is 0.035%～0.050%, Sb content is 0.002%～0.004%, and impurity element is P and S, P content≤0.040% in the control impurity, S content≤0.015% in the control impurity, all the other are iron.
The technology of preparation big section ferrite magnesium iron is as follows:
With fusing and the molten iron after desulfurization is handled in cupola furnace, add electric furnace intensification carburetting and handle through subcontracting again, make molten iron temperature rise to 1450～1480 ℃ and go out electric furnace and enter casting ladle, in casting ladle, carry out nodularization, inoculation;
When nodularization, inoculation: now nodulizing agent is put into casting ladle, the add-on of nodulizing agent is 1.1%～1.3% of a weight of molten iron; Add the Sb powder of weight of molten iron 0.0015%～0.0030% again, and make described Sb powder cover the nodulizing agent surface, cover 75 ferrosilicon of weight of molten iron 0.2～0.3% at the Sb powder surface again; Molten iron is poured in the casting ladle, and the spheroidizing reacion temperature is 1400～1430 ℃, and the nodularization time is 60～100 seconds; Before cast, again nucleating agent is added in the described casting ladle, the add-on of nucleating agent is 0.4%～0.6% of a weight of molten iron, the incubation time was controlled at 30～40 seconds; The weight percentage of Si is 70.0%～80.0% in the described nucleating agent, and all the other are iron;
In described nodulizing agent: the weight percentage of rare earth is 0.6%～2.0%, and the weight percentage of Mg is 6.0%～9.0%, and the weight percentage of Si is 40.0%～46.0%, and all the other are iron;
Finally make the each component that comprises following weight percentage in the big section ferrite magnesium iron: C content is 3.6%～3.9%, Si content is 1.7%～3.0%, Mn content is 0.1%～0.4%, Mg content is 0.035%～0.050%, Sb content is 0.002%～0.004%, and impurity element is P and S, P content≤0.040% in the control impurity, S content≤0.015% in the control impurity, all the other are iron.
Ferritic spheroidal graphite cast iron unit elongation of the present invention and impact value have met and exceeded the standard-required value, and guarantee that tensile strength and yield strength have also reached requirement, and the preparation method is simple.
Description of drawings
Fig. 1 is the metallograph of the big section ferrite magnesium iron of embodiment 1.
Fig. 2 is the metallograph of the big section ferrite magnesium iron of embodiment 2.
Embodiment
The invention will be further described below in conjunction with concrete drawings and Examples.
Embodiment 1
10 tons of fused molten iron in cupola furnace through desulfurization handle after in subcontract and add electric furnace and heat up, molten iron temperature is risen to 1450 ℃ goes out electric furnace, in casting ladle, carry out nodularization, inoculation;
Nodularization, inoculation: the molten iron after will heating up amounts to 5 tons and pours into and carry out nodularization in the casting ladle, inoculation, the spheroidizing reacion temperature is 1400 ℃, make the each component of nodulizing agent according to the weight of molten iron of pouring into, the weight of nodulizing agent be molten iron weight 1.1%, the add-on of nodulizing agent is closed 55kg, adopting the weight percentage of Re in the nodulizing agent is 0.6%, meter 330 grams, the weight percentage of Mg is 6.0%, meter 3.3kg, and the weight percentage of Si is 40.0%, meter 22kg, all the other are iron, and take by weighing the Sb powder of weight of molten iron 0.0015% and cover the nodulizing agent surface according to the weight of molten iron of pouring into, Sb powder meter 75 grams, cover the 75SiFe of weight of molten iron 0.3% again at the Sb powder surface, 75SiFe counts 15kg, and the nodulizing agent that is mixed with the Sb powder is joined in the molten iron to pour method, and the nodularization time is 60 seconds; Take by weighing the component of making nucleating agent according to the weight of molten iron of pouring into, the add-on of nucleating agent is 0.4% of a weight of molten iron, close 20kg, the weight percentage of Si is 70.0% in the control nucleating agent, close 14kg, iron accounts for 30%, closes 6kg, nucleating agent reacts the nearly later stage at magnesium iron to be disperseed to add in the hot metal ladle, and the incubation time is 30 seconds.
After testing, the each component that comprises following weight percentage in this big section ferrite magnesium iron: C content is 3.61%, Si content is 1.73%, Mn content is 0.19%, and Mg content is 0.035%, and Sb content is 0.002%, impurity element is P and S, P content≤0.040% in the control impurity, S content≤0.015% in the control impurity, all the other are iron.
By Fig. 1 metallograph as can be seen: Sb content is 0.0020% o'clock, does not have variation graphite substantially, and graphite pebbles also compares rounding.
Its performance sees Table 1.
Table 1
Embodiment 2
10 tons of fused molten iron in cupola furnace through desulfurization handle after in subcontract and add electric furnace and heat up, molten iron temperature is risen to 1480 ℃ comes out of the stove, in casting ladle, carry out nodularization, inoculation;
Nodularization, inoculation: the molten iron after intensification carburetting handled is poured into for 5 tons and is carried out nodularization, inoculation in the casting ladle, the spheroidizing reacion temperature is 1430 ℃, gets the each component of making nodulizing agent according to the weight of molten iron of pouring into, and the weight of nodulizing agent is 1.3% times of weight of molten iron, meter 65kg, the weight percentage of Re is 2.0% in the control nodulizing agent, meter 1.3kg, and the weight percentage of Mg is 9.0%, meter 5.85kg, the weight percentage of Si is 46.0%, meter 29.9kg, and all the other are iron.And take by weighing the Sb powder of weight of molten iron 0.0030% and cover the nodulizing agent surface according to the weight of molten iron of pouring into, Sb powder meter 150 grams, cover the 75SiFe of weight of molten iron 0.2% again at the Sb powder surface, 75SiFe counts 10kg, the nodulizing agent that is coated with the Sb powder is joined in the molten iron to pour method, and the nodularization time is 100 seconds; Take by weighing the component of making nucleating agent according to the weight of molten iron of pouring into, the add-on of nucleating agent is 0.6% of a weight of molten iron, amount to 30kg, the weight percentage of Si is 80.0% in the control nucleating agent, meter 24kg, all the other are iron, and nucleating agent reacts the nearly later stage at magnesium iron to be disperseed to add in the hot metal ladle, and the incubation time is 40 seconds.
After testing, the each component that comprises following weight percentage in this big section ferrite magnesium iron: C content is 3.89%, Si content is 2.95%, Mn content is 0.37%, and Mg content is 0.050%, and Sb content is 0.004%, impurity element is P and S, P content≤0.040% in the control impurity, S content≤0.015% in the control impurity, all the other are iron.
By Fig. 2 metallograph as can be seen: Sb content is 0.0040% o'clock, does not have variation graphite substantially, and graphite pebbles is rounding very also.
Its performance sees Table 2.
Table 2
By table 1 and table 2 as can be seen: Sb content is 0.0020% and 0.0040% o'clock, and not only unit elongation and impact value have met and exceeded the standard-required value, and tensile strength and yield strength have also reached requirement.Just the material that obtains by this kind technology not only can improve toughness of material, and can reach performance requriements.
Claims (2)
1, a kind of big section ferrite magnesium iron, it is characterized in that, the each component that comprises following weight percentage in the described big section ferrite magnesium iron: C content is 3.6%～3.9%, and Si content is 1.7%～3.0%, and Mn content is 0.1%～0.4%, Mg content is 0.035%～0.050%, Sb content is 0.002%～0.004%, and impurity element is P and S, P content≤0.040% in the control impurity, S content≤0.015% in the control impurity, all the other are iron.
2, the technology of the described big section ferrite magnesium iron of preparation claim 1 is characterized in that described technology comprises following steps:
With fusing and the molten iron after desulfurization is handled in cupola furnace, add electric furnace intensification carburetting and handle through subcontracting again, make molten iron temperature rise to 1450～1480 ℃ and come out of the stove and enter casting ladle, in casting ladle, carry out nodularization, inoculation;
When nodularization, inoculation: now nodulizing agent is put into casting ladle, the add-on of nodulizing agent is 1.1%～1.3% of a weight of molten iron; Add the Sb powder of weight of molten iron 0.0015%～0.0030% again, and make described Sb powder cover the nodulizing agent surface, cover 75 ferrosilicon of weight of molten iron 0.2～0.3% at the Sb powder surface again; Molten iron is poured in the casting ladle, and the spheroidizing reacion temperature is 1400～1430 ℃, and the nodularization time is 60～100 seconds; Before cast, again nucleating agent is added in the described casting ladle, the add-on of nucleating agent is 0.4%～0.6% of a weight of molten iron, the incubation time was controlled at 30～40 seconds; The weight percentage of Si is 70.0%～80.0% in the described nucleating agent, and all the other are iron;
In described nodulizing agent: the weight percentage of rare earth is 0.6%～2.0%, and the weight percentage of Mg is 6.0%～9.0%, and the weight percentage of Si is 40.0%～46.0%, and all the other are iron;
Finally make the each component that comprises following weight percentage in the big section ferrite magnesium iron: C content is 3.6%～3.9%, Si content is 1.7%～3.0%, Mn content is 0.1%～0.4%, Mg content is 0.035%～0.050%, Sb content is 0.002%～0.004%, and impurity element is P and S, P content≤0.040% in the control impurity, S content≤0.015% in the control impurity, all the other are iron.
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Effective date of registration: 20090710 Address after: No. 99, Huicheng Road, Huishan Development Zone, Jiangsu, Wuxi Applicant after: Jiangsu FAW Foundry Co., Ltd. Address before: No. 99, Huicheng Road, Huishan Development Zone, Jiangsu, Wuxi Applicant before: Wuxi Faw Foundry Co., Ltd. |
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Address after: 214177, No. 99, Huicheng Road, Huishan Development Zone, Jiangsu, Wuxi Patentee after: Jiangsu Tianqi Heavy Industry Co.,Ltd. Address before: 214177, No. 99, Huicheng Road, Huishan Development Zone, Jiangsu, Wuxi Patentee before: JIANGSU FAW FOUNDRY Co.,Ltd. |