CN102168219A - Spheroidization process for nickelic austenite spherical graphite cast iron - Google Patents
Spheroidization process for nickelic austenite spherical graphite cast iron Download PDFInfo
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- CN102168219A CN102168219A CN2011100921351A CN201110092135A CN102168219A CN 102168219 A CN102168219 A CN 102168219A CN 2011100921351 A CN2011100921351 A CN 2011100921351A CN 201110092135 A CN201110092135 A CN 201110092135A CN 102168219 A CN102168219 A CN 102168219A
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Abstract
The invention discloses a spheroidization process for nickelic austenite spherical graphite cast iron, and the process is characterized by providing a new spheroidizing agent and a spheroidization process. The spheroidization process for nickelic austenite spherical graphite cast iron mainly comprises the following steps: carrying out spheroidization by adopting nickel-magnesium-silicon alloy as the spheroidizing agent; carrying out inoculating treatment through strontium-containing ferrosilicon inoculant; and processing liquid metal, and solidifying, thus obtaining spherical graphite with tissues of over II level. The spheroidization process for the nickelic austenite spherical graphite cast iron has the beneficial effects that the specific gravity of the full nickel-magnesium-silicon alloy spheroidizing agent is greater than that of a common rare earth magnesium spheroidizing agent, therefore, when spheroidization is carried out on the nickelic austenite spherical graphite cast iron through the spheroidizing agent, the floating quantity is less, the spheroidizing reaction is ensured to be carried out at the bottom when ladling is conducted so as to lead the magnesium to be very effectively absorbed, thus avoiding the defect of bad spheroidizing due to the reasons that the specific gravity of the rare earth magnesium spheroidizing agent is smaller and the floating quantity is large when ladling is carried out, and ensuring the nickelic austenite spherical graphite cast iron to achieve a good percent of spheroidization effect.
Description
Technical field
The invention belongs to field of metal casting technology, especially a kind of high nickel austenite ductile iron spheroidizing process.
Background technology
D-2 type high-nickel austenite nodular cast iron nickel content is between 18%22%, it is organized as the globular graphite that distributes on the austenitic matrix, and contain minor amount of carbide, this material has good solidity to corrosion, fire-resistant oxidation resistant, simultaneously good low heat expansion property and low-temperature impact toughness, its good comprehensive mechanical performance being arranged also is that plain cast iron, ferrous materials can not substitute, and is widely used at present that valve, pipeline, water pump etc. are heat-resisting, in the manufacturing of corrosion-resistant parts.
Because this material belongs to alloy nodular cast iron, it is spherical that graphite form is, and this kind material carried out the quality of nodularization rate after the nodularization, directly influenced the mechanical property of this material, therefore, adopting which kind of spheriodizing technique, is to guarantee that this D-2 type high-nickel austenite nodular cast iron reaches the key of good nodularization rate.
Existing nodularization mode mainly is to adopt rare earth magnesium as nodulizing agent, because rare earth magnesium nodularizer proportion is less, in the nodularization process, especially when casting ladle, its float-amount is more, has then caused the material abnormal nodularizing, purpose of the present invention, just provide a kind of brand-new nodulizing agent and spheriodizing technique, avoided the generation of the problems referred to above, thereby guarantee that high-nickel austenite nodular cast iron obtains good nodularization rate.
Summary of the invention
Feature part of the present invention is to provide a kind of new nodulizing agent and spheriodization process thereof.Its main contents are for after adopting the U.S. silicon alloy of nickel and doing spheroidizing as nodulizing agent, molten metal are solidified after treatment obtain being organized as globular graphite more than the II level thereby make inoculation by the ferrosilicon nucleating agent that contains strontium again.
The invention has the beneficial effects as follows: because nickel magnesium silicon closes globalization agent proportion greater than common rare earth magnesium nodularizer.Therefore, this nodulizing agent is when doing spheroidizing to high-nickel austenite nodular cast iron, float-amount is few, guarantee when casting ladle to carry out spheroidizing reacion in the bottom, make magnesium by very effective absorption, thereby avoided the use rare earth magnesium nodularizer less because of proportion, float-amount is more when casting ladle, cause this weak point of abnormal nodularizing, guarantee that high-nickel austenite nodular cast iron reaches good nodularization rate effect.
Embodiment
The present invention implements through the following steps
One, the making of nickel mg-si master alloy nodulizing agent
(1) composition of nickel mg-si master alloy nodulizing agent
1, magnesium Mg10～20%
2, nickel 40～60%
3, silicon Si20～25%
4, iron Fe10～15%
(2) nickel mg-si master alloy nodulizing agent founds
1, electrolytic nickel and ferrosilicon are cast after with the fusion of 1: 1 weight ratio (about 1000 ℃ of fusing point) tabular, be broken into after the cooling＜the alloy fragment of 20mm.
2, with alloy fragment and full magnesium and the electrolytic nickel of belonging to 60%～70% alloy fragment, 10%～20% MAGNESIUM METAL, the ratio of 15%～25% electrolytic nickel is carried out fusion, being broken into 4～20mm fragment after the ingot casting cooling, to make nodulizing agent standby.
Two, spheroidizing
(1) the nickelic Ovshinsky spheroidal graphite cast iron of D-2 type material material proportioning: carbon content≤3.0% wherein, silicone content 1.5～3.0%, manganese content 0.7～1.25%, phosphorus content≤0.08, nickel content is 18～22%, chromium content is 1.75～2.75%.
(2) with D-2 type high-nickel austenite nodular cast iron by the fusion of above-mentioned material requirement proportioning after, rise and overflow to 1480 ℃～1500 ℃, adopt recessed anti-impact to go into method, the alloy nodulizer add-on is 0.8～1.2%, and tapping temperature is greater than 1470 ℃, because nickel mg-si master alloy nodulizing agent proportion is greater than common rare earth magnesium nodularizer, therefore, the float-amount of this nodulizing agent is few, guarantees to carry out spheroidizing reacion in the casting ladle bottom, therefore make magnesium reach effective absorption, thereby reach good nodularization rate effect.
Three, inoculation
Select the ferrosilicon nucleating agent that contains strontium for use, add-on is 0.8～1.2%, adds at twice, when spheroidizing, add simultaneously for the first time, finish adding molten metal surface, back in spheroidizing for the second time, and stir with iron staff with nodulizing agent, after treating its whole fusions, just can carry out pouring cast part.
The molten metal that carries out spheroidizing and inoculation is for preventing its decaying spheroidisation, must pour into a mould to finish in 10～15 minutes, and teeming temperature should be controlled at 1400～1440 ℃.
Claims (2)
1. high nickel austenite ductile iron spheroidizing process, after its feature part is to adopt the U.S. silicon alloy of nickel to do spheroidizing as nodulizing agent, molten metal is solidified after treatment obtain being organized as globular graphite more than the II level thereby make inoculation by the ferrosilicon nucleating agent that contains strontium again.
2. according to claim 1, a kind of high nickel austenite ductile iron spheroidizing process, its feature part is, implements through the following steps
One, the making of nickel mg-si master alloy nodulizing agent
(1) composition of nickel mg-si master alloy nodulizing agent
1, magnesium Mg10～20%
2, nickel 40～60%
3, silicon Si20～25%
4, iron Fe10～15%
(2) nickel mg-si master alloy nodulizing agent founds
1, electrolytic nickel and ferrosilicon are cast after with the fusion of 1: 1 weight ratio (about 1000 ℃ of fusing point) tabular, be broken into after the cooling＜the alloy fragment of 20mm.
2, with alloy fragment and full magnesium and the electrolytic nickel of belonging to 60%～70% alloy fragment, 10%～20% MAGNESIUM METAL, the ratio of 15%～25% electrolytic nickel is carried out fusion, being broken into 4～20mm fragment after the ingot casting cooling, to make nodulizing agent standby.
Two, spheroidizing
(1) the nickelic Ovshinsky spheroidal graphite cast iron of D-2 type material material proportioning: carbon content≤3.0% wherein, silicone content 1.5～3.0%, manganese content 0.7～1.25%, phosphorus content≤0.08, nickel content is 18～22%, chromium content is 1.75～2.75%.
(2) with D-2 type high-nickel austenite nodular cast iron by the fusion of above-mentioned material requirement proportioning after, rise and overflow to 1480 ℃～1500 ℃, adopt recessed anti-impact to go into method, the alloy nodulizer add-on is 0.8～1.2%, and tapping temperature is greater than 1470 ℃, because nickel mg-si master alloy nodulizing agent proportion is greater than common rare earth magnesium nodularizer, therefore, the float-amount of this nodulizing agent is few, guarantees to carry out spheroidizing reacion in the casting ladle bottom, therefore make magnesium reach effective absorption, thereby reach good nodularization rate effect.
Three, inoculation
Select the ferrosilicon nucleating agent that contains strontium for use, add-on is 0.8～1.2%, adds at twice, when spheroidizing, add simultaneously for the first time, finish adding molten metal surface, back in spheroidizing for the second time, and stir with iron staff with nodulizing agent, after treating its whole fusions, just can carry out pouring cast part.
The molten metal that carries out spheroidizing and inoculation is for preventing its decaying spheroidisation, must pour into a mould to finish in 10～15 minutes, and teeming temperature should be controlled at 1400～1440 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100921351A CN102168219A (en) | 2011-04-11 | 2011-04-11 | Spheroidization process for nickelic austenite spherical graphite cast iron |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011100921351A CN102168219A (en) | 2011-04-11 | 2011-04-11 | Spheroidization process for nickelic austenite spherical graphite cast iron |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732776A (en) * | 2012-04-19 | 2012-10-17 | 天津金盛达石油机械有限公司 | Thin-wall austenite nodular cast iron impeller production technology |
| CN104451356A (en) * | 2014-11-11 | 2015-03-25 | 衡阳市朝阳汽车配件制造有限公司 | High-nickel austenitic spheroidal graphite cast iron and preparation method thereof |
| CN105648135A (en) * | 2016-02-26 | 2016-06-08 | 铜陵安东铸钢有限责任公司 | Nodulizing agent for nodular cast iron and preparation method thereof |
| CN113088803A (en) * | 2021-03-25 | 2021-07-09 | 共享装备股份有限公司 | Process method for controlling spheroidization of nodular cast iron |
-
2011
- 2011-04-11 CN CN2011100921351A patent/CN102168219A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102732776A (en) * | 2012-04-19 | 2012-10-17 | 天津金盛达石油机械有限公司 | Thin-wall austenite nodular cast iron impeller production technology |
| CN104451356A (en) * | 2014-11-11 | 2015-03-25 | 衡阳市朝阳汽车配件制造有限公司 | High-nickel austenitic spheroidal graphite cast iron and preparation method thereof |
| CN105648135A (en) * | 2016-02-26 | 2016-06-08 | 铜陵安东铸钢有限责任公司 | Nodulizing agent for nodular cast iron and preparation method thereof |
| CN113088803A (en) * | 2021-03-25 | 2021-07-09 | 共享装备股份有限公司 | Process method for controlling spheroidization of nodular cast iron |
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Application publication date: 20110831 |