CN102230124A - Anti-wearing heat-resisting cast iron and preparation method thereof - Google Patents
Anti-wearing heat-resisting cast iron and preparation method thereof Download PDFInfo
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- CN102230124A CN102230124A CN2011101622959A CN201110162295A CN102230124A CN 102230124 A CN102230124 A CN 102230124A CN 2011101622959 A CN2011101622959 A CN 2011101622959A CN 201110162295 A CN201110162295 A CN 201110162295A CN 102230124 A CN102230124 A CN 102230124A
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Abstract
The invention discloses anti-wearing heat-resisting cast iron and a preparation method thereof. The cast iron comprises the following components in percentage by weight: 1.9 to 2.4 percent of C, 4.4 to 4.6 percent of Si, 0.6 to 0.9 percent of Mn, 0.35 to 0.55 percent of P, 1.2 to 1.5 percent of Cu, 0.1 to 0.15 percent of Ti and the balance of Fe, wherein the content of impurities is within 0.1 percent. The preparation method comprises the following steps of: preparing an appropriate charging material; smelting the charging material, and detecting ingredients of the elements in the smelting process to ensure the content of the charging material; and after the detection is qualified, heating iron liquor, tapping and inoculating the iron liquor. In the preparation method, Si, P, Cu and Ti are added into the cast iron, and the content of the components is optimized within a certain range, so the defect that the heat resistance and wearing resistance of the cast iron in the prior art do not coexist, and the cast iron which is high in the anti-wearing performance and can be used at high temperature is provided.
Description
Technical field
The present invention relates to a kind of cast iron and preparation method thereof, especially relate to a kind of anti-attrition heat resisting iron and preparation method thereof.
Background technology
Cast iron has good castability and wear resisting property as a kind of common Industrial materials.In the prior art,, can in plain cast iron, add an amount of element for anti-attrition and the thermotolerance that promotes cast iron.When promoting the thermotolerance of cast iron, common way is: the Si that adds certain content in cast iron.Along with the raising of Si content, the resistance toheat of cast iron gets a promotion, but hardness and anti-attrition can incur loss.When promoting the anti-attrition of cast iron, common way is: add a certain amount of P in cast iron.Though the existence of P can promote the anti-attrition of cast iron, can reduce the fusing point and the eutectic temperature of cast iron simultaneously, if the content of P increases, then the thermotolerance of cast iron reduces.That is to say, exist this those length that disappear between the thermotolerance of cast iron and the anti-attrition, incompatible defective.When therefore selecting the chemical ingredients of cast iron, except needs are considered the characteristic of each element in cast iron, also need consider of the influence of the content of each element to the cast iron generation.
Along with industrial expansion, ironcasting needs and can use under various environment, therefore how can also promote its thermotolerance in the anti-attrition performance that promotes cast iron, is the development trend of casting iron field.
Summary of the invention
The technical problem to be solved in the present invention is thermotolerance and the incompatible defective of anti-attrition that overcomes the prior art medium cast iron, and a kind of very high anti-attrition performance that has is provided, the cast iron that can at high temperature use simultaneously; Simultaneously, the present invention also will provide a kind of method for preparing this cast iron.
For achieving the above object, the technical solution used in the present invention is:
A kind of anti-attrition heat resisting iron is characterized in that: described cast iron comprises following component: C:1.9-2.4% by weight percentage; Si:4.4-4.6%; Mn:0.6-0.9%; P:0.35-0.55%; Cu:1.2-1.5%; Ti:0.1-0.15%; Surplus is Fe; Wherein, the content of impurity S is in 0.1%.
As a kind of optimal way of the present invention, Si by weight percentage content in cast iron is 4.5%.
As another kind of optimal way of the present invention, the P that contains in the cast iron, Cu, Ti content by weight percentage is respectively: 0.45%, 1.3%, 0.12%.
For preparing this cast iron, preparation method of the present invention comprises following operation:
A. furnace charge arrangement step: configuration respectively by weight: 20-30 part Z14# pig iron, 30-40 part steel scrap, 35-45 part HT250 foundry returns, 3.5-4.5 part 75# ferrosilicon, 1.2-1.5 part fine copper, 1.1-1.3 part ferrotianium, 1.4-2.0 part ferrorphosphorus, 0.6-0.8 part nucleating agent;
B. melting operation: in stove, arrange furnace charge and heat up, the furnace charge that is disposed is all melted;
C. adjust elemental composition: the fused furnace charge is carried out sampling analysis and adjusts elemental composition, treat that elemental composition is qualified after, be warming up to 1480-1500 ℃ and come out of the stove;
D. breed operation: after iron liquid is come out of the stove, pour into nucleating agent in the iron liquid and cover last perlite and left standstill 2-3 minute.
The present invention has compared with prior art reached following beneficial effect:
1) in cast iron, adds a certain amount of Si, P, Ti, Cu simultaneously, and optimized content, to reach the effect of well heat-resisting and anti-attrition;
2) in cast iron, also add a certain amount of Mn, and optimized content, made Mn have in the enough content and the deleterious effect of impurity S, also had certain surplus to strengthen the intensity and the toughness of cast iron simultaneously.
Embodiment
The present invention is described further below in conjunction with embodiment.
In first embodiment of cast iron of the present invention, comprise following component: C:1.9-2.4% by weight percentage; Si:4.4-4.6%; Mn:0.6-0.9%; P:0.35-0.55%; Cu:1.2-1.5%; Ti:0.1-0.15%; Surplus is Fe; Wherein, the content of impurity S is in 0.1%.
The cast iron for preparing this embodiment, can adopt following method:
A. dispose furnace charge, by weight configuration respectively: 20-30 part Z14# pig iron, 30-40 part steel scrap, 35-45 part HT250 foundry returns, 3.5-4.5 part 75# ferrosilicon, 1.2-1.5 part fine copper, 1.1-1.3 part ferrotianium, 1.4-2.0 part ferrorphosphorus, 0.6-0.8 part nucleating agent.
Wherein, ferrotianium is the main source of Ti element; Ferrorphosphorus is the main source of P, Si, Mn element.
B. melting furnace charge: can adopt medium-frequency induction furnace during the melting furnace charge.
In order to improve melting efficiency,, in electric furnace, add the Z14# pig iron, steel scrap from bottom to top successively according to the characteristics of furnace in the electric stove hearth.
Spreading the Z14# pig iron earlier at furnace bottom, is in order to obtain the fusing that fused iron liquid obtains iron charge as early as possible.
After furnace charge arranged, earlier with the small power blow-on, the power with electric furnace after 5-10 minute rose to 90%, furnace charge begins fusing, in the process of furnace charge fusing, constantly add steel scrap, foundry returns, 75# ferrosilicon, in the process of smelting iron liquid, add fine copper, ferrotianium, phosphorus titanium alloy.
C. after waiting that the furnace charge that is disposed all melts, chemical analysis is carried out in sampling, adjusts the composition of each element then.After treating that the elemental composition analysis is qualified, be warming up to 1480-1500 ℃ and come out of the stove.
D. after iron liquid is come out of the stove, add nucleating agent in iron liquid, described nucleating agent is preferably the 75# ferrosilicon; Evenly sprinkle subsequently a certain amount of, the perlite of 1-2% by weight percentage for example.Leave standstill the graphite and the matrix refinement that made cast iron in 2-3 minute, make the intensity of cast iron improve.After leaving standstill, promptly pourable.
In second embodiment of cast iron of the present invention, Si content by weight percentage is 4.5%; The content of other elements is identical with first embodiment.Such technical scheme has been optimized the resistance toheat of cast iron especially.
In the 3rd embodiment of cast iron of the present invention, P, Cu, Ti content by weight percentage is respectively: 0.45%, 1.3%, 0.12%; The content of other elements is identical with first embodiment.Such technical scheme has been improved the anti-attrition performance of cast iron especially.
When preparing the cast iron of this embodiment, can adopt following method:
A. dispose furnace charge, by weight configuration respectively: 25 parts of Z14# pig iron, 35 parts of steel scraps, 40 parts of HT250 foundry returns, 4.0 parts of 75# ferrosilicon, 1.3 parts of fine copper, 1.176 parts of ferrotianiums, 1.7 parts of ferrorphosphorus, 0.8 part of nucleating agent.
The used Z14# pig iron in the present embodiment contains following component: C:4.19% by weight percentage; Si:1.46%; Mn:0.76%; P:0.14; S:0.036%; Surplus is Fe.
Used steel scrap in the present embodiment contains following component: C:0.15% by weight percentage; Si:0.35%; Mn:0.50%; P:0.05%; S:0.05%; Surplus is Fe.
The HT250 foundry returns that uses in the present embodiment contains following component: C:3.18% by weight percentage; Si:1.78%; Mn:0.86%; P:0.07%; S:0.098%; Surplus is Fe.
The ferrotianium that uses in the present embodiment contains following component: Ti:17% by weight percentage; C:7%; Surplus is Fe.
The ferrorphosphorus that uses in the present embodiment contains following component: P:23% by weight percentage; Si:3.0%; Mn:2.5%; Surplus is Fe.
B. melting furnace charge:
In electric furnace, add the Z14# pig iron, steel scrap from bottom to top successively.
After furnace charge arranged, earlier with the small power blow-on, the power with electric furnace after 5 minutes rose to 90%, furnace charge begins fusing, in the process of furnace charge fusing, constantly add steel scrap, foundry returns, 75# ferrosilicon, in the process of smelting iron liquid, add fine copper, ferrotianium, phosphorus titanium alloy.
C. after waiting that the furnace charge that is disposed all melts, chemical analysis is carried out in sampling, adjusts the composition of each element then.After treating that the elemental composition analysis is qualified, be warming up to 1480-1500 ℃ and come out of the stove.
D. after iron liquid is come out of the stove, in iron liquid, add nucleating agent, evenly sprinkle the perlite of 1-2% by weight percentage subsequently.After leaving standstill 2-3 minute, promptly pourable.
Cast iron in the present embodiment is detected according to graphitic cast iron standard GB9439-88, and its tensile strength is: 285-330MP; Hardness is 210-245HBV.And ironcasting can bear 850-950 ℃ high temperature, and very high anti-attrition performance is arranged.
In conjunction with embodiment the present invention is done detailed explanation above, but the invention is not restricted to this.Those skilled in the art under the prerequisite of aim of the present invention, can make various distortion and modification in the ken that is possessed.
Claims (8)
1. anti-attrition heat resisting iron, it is characterized in that: described cast iron comprises following component: C:1.9-2.4% by weight percentage; Si:4.4-4.6%; Mn:0.6-0.9%; P:0.35-0.55%; Cu:1.2-1.5%; Ti:0.1-0.15%; Surplus is Fe; Wherein, the content of impurity S is in 0.1%.
2. anti-attrition heat resisting iron according to claim 1 is characterized in that: the Si that contains in described cast iron content by weight percentage is 4.5%.
3. anti-attrition heat resisting iron according to claim 1 is characterized in that: the P that contains in the described cast iron, Cu, Ti content by weight percentage is respectively: 0.45%, 1.3%, 0.12%.
4. method for preparing the described cast iron of claim 1 comprises following operation:
Furnace charge arrangement step: configuration respectively by weight: 20-30 part Z14# pig iron, 30-40 part steel scrap, 35-45 part HT250 foundry returns, 3.5-4.5 part 75# ferrosilicon, 1.2-1.5 part fine copper, 1.1-1.3 part ferrotianium, 1.4-2.0 part ferrorphosphorus, 0.6-0.8 part nucleating agent;
Melting operation: in stove, arrange furnace charge and intensification, the furnace charge that is disposed is all melted;
Adjust elemental composition: the fused furnace charge is carried out sampling analysis and adjusts elemental composition, treat that elemental composition is qualified after, be warming up to 1480-1500 ℃ and come out of the stove;
Breed operation: after iron liquid is come out of the stove, pour into nucleating agent in the iron liquid and cover last perlite and left standstill 2-3 minute.
5. method according to claim 4 is characterized in that: described nucleating agent is the 75# ferrosilicon.
6. method according to claim 4 is characterized in that: at step c, described perlitic covering add-on is 1-2% by weight percentage.
7. method according to claim 4 is characterized in that: what described preparation method adopted is medium-frequency induction furnace.
8. method according to claim 7 is characterized in that: at step b, arrange earlier the Z14# pig iron, steel scrap from the bottom up successively in electric furnace; Furnace charge arranges the back intensification and makes its fusing, and interpolation and fusing remain furnace charge in the process of fusing.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102634724A (en) * | 2012-05-15 | 2012-08-15 | 浙江金火机床有限公司 | Machine tool guide rail cast iron and preparation method thereof |
| CN104195412A (en) * | 2014-08-14 | 2014-12-10 | 芜湖国鼎机械制造有限公司 | High-strength gray cast iron and cast parts and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435226A (en) * | 1981-12-01 | 1984-03-06 | Goetze Ag | Wear resistant cast iron alloy with spheroidal graphite separation and manufacturing method therefor |
| CN101603143A (en) * | 2009-07-23 | 2009-12-16 | 芜湖市金贸流体科技股份有限公司 | High temperature resistant nodular cast iron pipe fittings and production method thereof |
| CN101698921A (en) * | 2009-09-07 | 2010-04-28 | 芜湖市金贸流体科技股份有限公司 | Wear-resistant spheroidal graphite cast iron and preparation method thereof |
-
2011
- 2011-06-16 CN CN2011101622959A patent/CN102230124A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4435226A (en) * | 1981-12-01 | 1984-03-06 | Goetze Ag | Wear resistant cast iron alloy with spheroidal graphite separation and manufacturing method therefor |
| CN101603143A (en) * | 2009-07-23 | 2009-12-16 | 芜湖市金贸流体科技股份有限公司 | High temperature resistant nodular cast iron pipe fittings and production method thereof |
| CN101698921A (en) * | 2009-09-07 | 2010-04-28 | 芜湖市金贸流体科技股份有限公司 | Wear-resistant spheroidal graphite cast iron and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102634724A (en) * | 2012-05-15 | 2012-08-15 | 浙江金火机床有限公司 | Machine tool guide rail cast iron and preparation method thereof |
| CN104195412A (en) * | 2014-08-14 | 2014-12-10 | 芜湖国鼎机械制造有限公司 | High-strength gray cast iron and cast parts and preparation method thereof |
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Application publication date: 20111102 |