CN105039838A - Corrosion-resistant nodular cast iron and preparing method thereof - Google Patents
Corrosion-resistant nodular cast iron and preparing method thereof Download PDFInfo
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- CN105039838A CN105039838A CN201510512448.6A CN201510512448A CN105039838A CN 105039838 A CN105039838 A CN 105039838A CN 201510512448 A CN201510512448 A CN 201510512448A CN 105039838 A CN105039838 A CN 105039838A
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Abstract
The invention discloses a corrosion-resistant nodular cast iron and a preparing method thereof. The corrosion-resistant nodular cast iron includes the following chemical elements of Si, C, Mn, Mo, P, S, Cr and Fe. The preparing method includes the three steps of control over the conditions, detection of the components, and adjustment of the components. Compared with the prior art, the corrosion-resistant nodular cast iron and the preparing method have the beneficial effects that by means of the method, spheroidisation is conducted in a low-oxygen environment, so that a firm protective layer is formed on the surface of the nodular cast iron, a stable phase is obtained by a cast iron matrix, and therefore corrosion resistance is improved; temperature is controlled to be high in an inoculation treatment process, so that gathering of part of carbides is effectively avoided, and the mechanical properties of the nodular cast iron are ensured; corresponding data are detected and adjusted in time in the manufacturing process, and therefore the production strictness and precision are ensured.
Description
Technical field
The invention belongs to alloy smelting essence casting technical field, be specifically related to a kind of anti-corrosion spheroidal graphite cast iron and preparation method thereof.
Background technology
Spheroidal graphite cast iron refer to molten iron in process of setting carbon with the cast iron of ball-type Graphite Precipitation, compared with graphitic cast iron, the maximum change not being both graphite shape of its metallographic structure, avoid the existence of sharp-pointed graphite in graphitic cast iron, the cutting action of graphite to metal body is greatly reduced, essentially eliminate the stress concentration phenomenon that flake graphite causes, make the rate of utilization of strength of metal body reach 70-90%, thus the performance of metal body is obtained play significantly.Current spheroidal graphite cast iron produces many its intensity of emphasis, toughness and ductility, and its corrosion resistance has certain deficiency, causes having corrosive environment to use at some and is limited to.
Summary of the invention
The object of the invention is for existing problem, provide a kind of anti-corrosion spheroidal graphite cast iron and preparation method thereof.
The present invention is achieved by the following technical solutions:
A kind of anti-corrosion spheroidal graphite cast iron, described spheroidal graphite cast iron contains the chemical element of following weight percent: Si:4.5-6.0%, C:2.8-3.4%, Mn:0.25-0.45%, Mo:0.35-0.65%, P:0.25-0.4%, S:0.01-0.02%, Cr:0.15-0.45%, surplus is iron.
A preparation method for anti-corrosion spheroidal graphite cast iron, comprises the following steps:
(1) with small power blow-on, raise furnace power gradually, raw material is put into electric furnace by substep simultaneously, and after waiting until that configured furnace charge melts completely, sampling analysis chemical composition, makes corresponding adjustment, by furnace temperature control at 1450-1500 DEG C according to result;
(2) in nodularization bag, nitrogen is full of, the side of the nodulizing agent of corresponding deal from nodularization bag is added, then the nucleating agent of 70% is covered on nodulizing agent uniformly, and sprinkle perlite, pour the molten iron of gross weight 2/3rds, carry out spheroidizing and inoculation;
(3) after spheroidizing completes, remaining nucleating agent is poured nodularization bag with remaining molten iron, process and detect nodularization after 3 minutes and breed result, as not qualified, then do respective handling, can cast after qualified.
As further improvement of these options, the described spheroidizing time is 2-4 minute, and inoculation temperature is 1500-1530 DEG C, and pouring temperature is 1400-1420 DEG C.
As further improvement of these options, all comprise rare earth in described nucleating agent and nodulizing agent, nucleating agent Rare-Earth Content is 4-8%, and nodulizing agent Rare-Earth Content is 8-10%.
The present invention has the following advantages compared to existing technology: use method in invention; spheroidizing is carried out in low-oxygen environment; spheroidal graphite cast iron surface is made to form firmly protective layer; make cast iron matrix obtain stable phase body, thus improve its erosion resistance, inoculation time control is built in comparatively high temps; effectively avoid the gathering of partially carbonized thing; ensure that the mechanicalness of spheroidal graphite cast iron, in preparation process, detect corresponding data and adjust in time, ensure that the rigorous and accurate of production.
Embodiment
Embodiment 1
A kind of anti-corrosion spheroidal graphite cast iron, described spheroidal graphite cast iron contains the chemical element of following weight percent: Si:4.5%, C:3.2%, Mn:0.25%, Mo:0.45%, P:0.3%, S:0.01%, Cr:0.33%, and surplus is iron.
Embodiment 2
A kind of anti-corrosion spheroidal graphite cast iron, described spheroidal graphite cast iron contains the chemical element of following weight percent: Si:4.8%, C:3.0%, Mn:0.43%, Mo:0.36%, P:0.28%, S:0.02%, Cr:0.18%, and surplus is iron.
Embodiment 3
A kind of anti-corrosion spheroidal graphite cast iron, described spheroidal graphite cast iron contains the chemical element of following weight percent: Si:5.6%, C:2.8%, Mn:0.36%, Mo:0.58%, P:0.36%, S:0.01%, Cr:0.24%, and surplus is iron.
Embodiment 4
A kind of anti-corrosion spheroidal graphite cast iron, described spheroidal graphite cast iron contains the chemical element of following weight percent: Si:6.0%, C:3.4%, Mn:0.28%, Mo:0.62%, P:0.25%, S:0.02%, Cr:0.45%, and surplus is iron.
The preparation method of above-mentioned spheroidal graphite cast iron, comprises the following steps:
(1) with small power blow-on, raise furnace power gradually, raw material is put into electric furnace by substep simultaneously, and after waiting until that configured furnace charge melts completely, sampling analysis chemical composition, makes corresponding adjustment, by furnace temperature control at 1450-1500 DEG C according to result;
(2) in nodularization bag, nitrogen is full of, the side of the nodulizing agent of corresponding deal from nodularization bag is added, then the nucleating agent of 70% is covered on nodulizing agent uniformly, and sprinkle perlite, pour the molten iron of gross weight 2/3rds, carry out spheroidizing and inoculation;
(3) after spheroidizing completes, remaining nucleating agent is poured nodularization bag with remaining molten iron, process and detect nodularization after 3 minutes and breed result, as not qualified, then do respective handling, can cast after qualified.
Choose and do not produce spheroidal graphite cast iron example 1 in contrast containing the spheroidal graphite cast iron of Mo and Cr element by preparation method in the present invention, after adding electric furnace with the raw material of above-mentioned same component, at the temperature of 1500 DEG C, carry out spheroidizing and inoculation, build immediately after processing standing two minutes.
Sample according to spheroidal graphite cast iron obtained in above-described embodiment, and above-mentioned two groups of control groups, be placed in room temperature (about 25 DEG C), carry out corrosion treatment with the sulphuric acid soln of 0.5% concentration, keep a record after processing same time respectively, draw following data:
Table 1
From table 1, data can find out that in the present invention, spheroidal graphite cast iron is after sulfuric acid corrosion, tensile strength has certain reduction, in control group 1 and control group 2, tensile strength is along with the growth of etching time, tensile strength is influenced larger, and owing to failing instant result to feed back at any time in preparation method and producing process does not carry out under low-oxygen environment in control group 2, cause production performance not good, in the present invention, gained spheroidal graphite cast iron tensile strength after corrosion reduces slowly, can improve the rate of utilization of spheroidal graphite cast iron in corrosive atmosphere.
Claims (4)
1. an anti-corrosion spheroidal graphite cast iron, is characterized in that, described spheroidal graphite cast iron contains the chemical element of following weight percent: Si:4.5-6.0%, C:2.8-3.4%, Mn:0.25-0.45%, Mo:0.35-0.65%, P:0.25-0.4%, S:0.01-0.02%, Cr:0.15-0.45%, surplus is iron.
2. a preparation method for anti-corrosion spheroidal graphite cast iron, is characterized in that, comprises the following steps:
(1) with small power blow-on, raise furnace power gradually, raw material is put into electric furnace by substep simultaneously, and after waiting until that configured furnace charge melts completely, sampling analysis chemical composition, makes corresponding adjustment, by furnace temperature control at 1450-1500 DEG C according to result;
(2) in nodularization bag, nitrogen is full of, the side of the nodulizing agent of corresponding deal from nodularization bag is added, then the nucleating agent of 70% is covered on nodulizing agent uniformly, and sprinkle perlite, pour the molten iron of gross weight 2/3rds, carry out spheroidizing and inoculation;
(3) after spheroidizing completes, remaining nucleating agent is poured nodularization bag with remaining molten iron, process and detect nodularization after 3 minutes and breed result, as not qualified, then do respective handling, can cast after qualified.
3. the preparation method of a kind of anti-corrosion spheroidal graphite cast iron as claimed in claim 2, it is characterized in that, the described spheroidizing time is 2-4 minute, and inoculation temperature is 1500-1530 DEG C, and pouring temperature is 1400-1420 DEG C.
4. the preparation method of a kind of anti-corrosion spheroidal graphite cast iron as claimed in claim 2, it is characterized in that, all comprise rare earth in described nucleating agent and nodulizing agent, nucleating agent Rare-Earth Content is 4-8%, and nodulizing agent Rare-Earth Content is 8-10%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510512448.6A CN105039838A (en) | 2015-08-20 | 2015-08-20 | Corrosion-resistant nodular cast iron and preparing method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401053A (en) * | 2015-11-28 | 2016-03-16 | 芜湖市容川机电科技股份有限公司 | Nodular cast iron and preparation method thereof |
| CN110193592A (en) * | 2019-06-24 | 2019-09-03 | 界首万昌新材料技术有限公司 | A method of improving differential carrier corrosion resistance |
| CN115537644A (en) * | 2022-09-30 | 2022-12-30 | 新兴铸管股份有限公司 | Corrosion-resistant nodular cast iron pipeline and preparation method thereof |
-
2015
- 2015-08-20 CN CN201510512448.6A patent/CN105039838A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105401053A (en) * | 2015-11-28 | 2016-03-16 | 芜湖市容川机电科技股份有限公司 | Nodular cast iron and preparation method thereof |
| CN110193592A (en) * | 2019-06-24 | 2019-09-03 | 界首万昌新材料技术有限公司 | A method of improving differential carrier corrosion resistance |
| CN115537644A (en) * | 2022-09-30 | 2022-12-30 | 新兴铸管股份有限公司 | Corrosion-resistant nodular cast iron pipeline and preparation method thereof |
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