CN102352460A - High-chromium white cast iron spherical plug and preparation method thereof - Google Patents
High-chromium white cast iron spherical plug and preparation method thereof Download PDFInfo
- Publication number
- CN102352460A CN102352460A CN2011103296649A CN201110329664A CN102352460A CN 102352460 A CN102352460 A CN 102352460A CN 2011103296649 A CN2011103296649 A CN 2011103296649A CN 201110329664 A CN201110329664 A CN 201110329664A CN 102352460 A CN102352460 A CN 102352460A
- Authority
- CN
- China
- Prior art keywords
- iron
- cast iron
- white cast
- chromium white
- stove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses a high-chromium white cast iron spherical plug and a preparation method thereof. The high-chromium white cast iron spherical plug comprises the following components by weight percent: 1.8%-2.2% of C, 16%-22% of Cr, 0.5%-1.0% of Si, 0.3%-0.6% of Mn, 1.6%-2.2% of Ni, 0.6%-1.5% of FeSiRE, 0.2%-0.7% of V and the balance of iron. The preparation method comprises the following steps: adding fewer aluminium sheets in high-chromium white cast molten iron for pre-deoxidation before pouring, and then adding a special modifier to perform modification treatment to molten iron; adding a covering flux on the surface of the molten iron in the ladle, standing, and pouring; and demoulding, polishing the surface and performing heat treatment by adopting the graded heat preservation treatment method. The M7C3 type carbide in the high-chromium white cast iron changes from the continuous, netted and bulky board to the isolated, intermittent and thin strip, the structural homogeneity of the matrix is increased, a lot of secondary carbide is precipitated, higher hardness can be obtained while the toughness of cast iron is improved and the plug is widely used in the rolling production process of the seamless steel tube.
Description
Technical field
The present invention relates to spherical top of a kind of plug mill and method of manufacture thereof, relate in particular to spherical top of a kind of high-chromium white cast iron and method of manufacture thereof.
Background technology
The spherical top of plug mill is one of main tool of using in the hotrolling seamless pipe production process.Because the work under bad environment of spherical top in the tube rolling process; During tube rolling; The working temperature of spherical top is up to more than 1000 ℃; The effect of the cyclic thermal stres that meanwhile also will bear the effect of huge impact load and caused by suddenly cold and hot, this mechanical fatigue and thermal stress fatigue effect make the change inefficacy of forms such as shape and cracking of globe-roof hair easily.The inefficacy and the frequent change of spherical top cause the service efficiency of material to reduce on the one hand, and the steel pipe's production cost improves; On the other hand, the spherical top of frequent change will have a strong impact on the efficient of whole pipe production line.Therefore, how to improve spherical top work-ing life, guarantee that the steel pipe's production quality all is one of weldless steel tube industry important topic of endeavouring to solve all the time.
High-chromium white cast iron is as a kind of good wear-resistant material; Obtained using widely in fields such as metallurgy, mine, building materials, electric power, cement, road building machine, refractory materialss; And having obtained favorable economic benefit and social benefit, this mainly gives the credit to the M that is inlaying high firmness in the high-chromium white cast iron
7C
3The type carbide, tissue characteristic has determined that also high-chromium white cast iron is a kind of excellent material for preparing the spherical top of plug mill in this.
At present; People have carried out a large amount of research from material chemical composition, the different angles such as processing, thermal treatment process, casting technique that go bad to the method for toughening of high-chromium white cast iron; But majority all is based on and improves wearing piece following work-ing life of normal temperature condition and unfolded, and is less relatively in the research in hot conditions following work-ing life to how improving high-chromium white cast iron.
Domestic seamless steel tube production is used more sphere top material and is generally the high chromium nickel of middle and high carbon white cast iron, and its main chemical compositions content is: C 2.6% ~ 3.0%, Cr 26% ~ 29 %; Si 1.7% ~ 2.0%; Mn 0.6% ~ 0.8%, and Ni 3.6% ~ 4.0%, and surplus is an iron.Before use, sphere comes directly towards the common thermal treatment process that adopts for taking off steady processing, is incubated 4 ~ 8h down at 950 ℃ ~ 1050 ℃ that is:, the air cooling of coming out of the stove, and then under 200 ℃ ~ 400 ℃, be incubated 4 ~ 8h, the air cooling of coming out of the stove.But because high-chromium white cast iron belongs to hard brittle material after all; Toughness is relatively poor; The sphere of above-mentioned prepared comes directly towards defectives such as usually occurring distortion and cracking in actual use and scraps, and hardness, toughness and wear resisting property can not reach good cooperation, cause spherical top shorter work-ing life.
Summary of the invention
The objective of the invention is to be directed against the above-mentioned deficiency that occurs in existing weldless steel tube plug rolling unit globe-roof head and the method for manufacture thereof, and spherical top of a kind of high-chromium white cast iron and method of manufacture thereof are provided.
The present invention realizes that like this each weight percentages of components of the spherical top of high-chromium white cast iron is: C 1.8% ~ 2.2%, Cr 16% ~ 22 %; Si 0.5% ~ 1.0%, and Mn 0.3% ~ 0.6%, and Ni 1.6% ~ 2.2%; FeSiRE 0.6% ~ 1.5%, and V 0.2% ~ 0.7%, and surplus is an iron.Through adopting suitable optimizing components, the rotten processing and casting technique; Improve the size and the form of the matrix and the carbide of high-chromium white cast iron; In conjunction with certain thermal treatment process; Further optimize the weave construction of high-chromium white cast iron, the high-chromium white cast iron of guaranteeing to be produced still keeps higher hardness and wear resisting property improving flexible simultaneously.
The method of manufacture step of the spherical top of high-chromium white cast iron of the present invention is:
(1) adopting the pig iron, low carbon ferrochromium, nickel ferromanganese, steel scrap, ferrosilicon etc. is starting material, prepares burden according to the batching prescription that provides;
(2) the good starting material heat fused of will preparing burden becomes molten iron, and the cast iron melting temperature is 1480 ℃ ~ 1550 ℃, and tapping temperature is about 1500 ℃;
(3) add 0.2% ~ 0.7% vanadium iron and 0.6% ~ 1.5% FeSiRE processing of going bad; Vanadium adopts the mode that directly drops into to add; The mode that FeSiRE adopts the bag end to pour adds; Adopt a small amount of aluminium flake to carry out preliminary dexidation before coming out of the stove, the molten iron after going bad obtains the sphere top of different size through cast, moulding in green sand mold;
(4) thermal treatment process of the present invention's employing is that the classification heat preservation hot is handled; Be about to foundry goods and be heated to 1100 ℃ ~ 1200 ℃ insulation 0.5h ~ 2h; Be chilled to 850 ℃ ~ 950 ℃ insulation 3h ~ 6h with stove, the sand cooling of coming out of the stove, postheating to the 300 ℃ ~ 400 ℃ of insulation 3h ~ 6h sand cooling of coming out of the stove.
Compared with prior art, the spherical top of high-chromium white cast iron of the present invention has the following advantages:
(1) the present invention follows the principle of practicing thrift alloying element, satisfying excellent properties in the optimizing components design, utilizes related tissue's structure, the performance index of original high-chromium white cast iron, has suitably reduced constituent contents such as C, Cr, Ni, Mn.Because C, Cr are carbide forming elements, keep under the EQUILIBRIUM CONDITION at C, Cr element, along with the raising of C content, carbide quantity is many more, and material hardness and wear resisting property are also along with increase, but too high carbon content will reduce the impelling strength of material, increase fragility.During lower C content, the austenite dendrites spacing is less, makes netted eutectic carbides interrupted, and the crack tip stress concentration obtains release to a certain degree, changes the direction of crack propagation simultaneously, suppresses the unstable propagation of crackle, improves the fracture toughness property of material.Simultaneously, the current industrial production material cost grows to even greater heights, and reduces the production cost that expensive alloying element will help reducing the spherical top of high-chromium white cast iron.
(2) an amount of alterant vanadium and FeSiRE have also been added simultaneously in the spherical top of high-chromium white cast iron according to the invention on the basis of optimizing components design; Through vanadium and FeSiRE purifying molten iron; Remove the detrimental impurity of crystal boundary enrichment in the crystal structure; Crystal grain thinning improves the foundry goods tissue, improves over-all properties.
(3) the spherical top of high-chromium white cast iron according to the invention adopts classification heat preservation hot treatment process to heat-treat.Compare with the steady treatment process of taking off of routine, carry out first step insulation at comparatively high temps during the classification insulation is handled, help reducing tiny crack quantity and reduction composition segregation phenomena in the foundry goods, improve the toughness of material; Carry out second stage insulation at a lower temperature; Separate out the proeutectoid carbide particle of a large amount of different levels on the matrix, reduced the carbon content in the matrix on the one hand, help martensitic formation; Improve the hardness of material; The proeutectoid carbide disperse is distributed in and plays second effect of reinforcement mutually in the matrix on the other hand, and fatigue cracking is difficult for germinating and unstable propagation, and wear resisting property improves.Therefore, high-chromium white cast iron hardness, impelling strength that classified insulation is handled reach rational matching more, and wear resisting property improves, and shows good use properties under the hot conditions.
(4) test-results shows; When carrying out the tube rolling test on the Φ 90mm of the well-known large-sized seamless steel pipe of high-chromium white cast iron according to the invention spherical top certain domestic factory and the Φ 140mm unit; Rolling low-alloy weldless steel tube is more than 200, far above the sphere top (be about 100 work-ing life) of generally adopting at present.In the examination operation of rolling of compo pipe, it is more than 1.5 times of sphere top that generally adopt at present that high-chromium white cast iron sphere of the present invention comes directly towards work-ing life.
Below in conjunction with embodiment spherical top of high-chromium white cast iron according to the invention and method of manufacture thereof are explained further details.
Description of drawings
Fig. 1 is the metallograph of each embodiment, wherein: be that traditional technology as cast condition metallographic, (b) are embodiment two heat treatment state metallographics for embodiment one heat treatment state metallographic, (e) for embodiment two as cast condition metallographics, (f) for embodiment one as cast condition metallographic, (d) for traditional technology heat treatment state metallographic, (c) (a);
Fig. 2 uses the macro morphology figure after losing efficacy for the sphere top that traditional technology is made;
Fig. 3 uses the macro morphology figure after losing efficacy for the sphere top of adopting the present invention's manufacturing.
Embodiment
Embodiment one
Each weight percentages of components of the spherical top of high-chromium white cast iron is: C 1.9%, Cr 18.5 %, and Si 0.7%, and Mn 0.6%, and Ni 2.1%, and FeSiRE 0.8%, and V 0.6%, and surplus is an iron, and its ME is:
(1) fusing of 750kg medium-frequency induction furnace is put in the mixing of furnace charges such as the pig iron, low carbon ferrochromium, steel scrap, treat molten iron molten clear back adding nickel ferromanganese and ferrosilicon, every stove furnace charge weight is 600kg;
(2) stokehold is adjusted to branch and temperature is risen to 1520 ℃ ~ 1550 ℃ after qualified, adds a small amount of aluminium flake and carries out deoxidation, and deoxidation is after 1 ~ 2 minute, and adding 3.6Kg is the processing of go bad of 5 ~ 25mm vanadium iron piece through preheating, granularity, and the vanadium iron adding was come out of the stove after 1 ~ 2 minute;
(3) be that the rare earth ferrosilicon alloy of 1 ~ 4mm is placed on casting ladle bottom through prebake with the 4.8Kg granularity, with ladle bottom pouring process to the molten iron processing of going bad;
(4) molten iron pouring being become size is the spherical top of Φ 90mm, and molten steel pouring temperature is about 1480 ℃;
(5) sphere of casting top is put in carries out the classification insulation in the high temperature box type resistance furnace and handle.Classification insulation treatment process is: foundry goods is heated to 1200 ℃ of insulation 1h, is chilled to 850 ℃ of insulation 6h with stove, the sand cooling of coming out of the stove, postheating to the 400 ℃ insulation 3h sand cooling of coming out of the stove.
The spherical top of the high-chromium white cast iron that adopts above-mentioned technology to make, basic mechanical performance is as shown in table 1.
Embodiment two
Each weight percentages of components of the spherical top of high-chromium white cast iron is: C 1.84%, Cr 19.2 %, and Si 0.8%, and Mn 0.7%, and Ni 1.8%, FeSiRE 1.3 %, V 0.3%, and surplus is an iron.Its ME is:
(1) fusing of 750kg medium-frequency induction furnace is put in the mixing of furnace charges such as the pig iron, low carbon ferrochromium, steel scrap, treat molten iron molten clear back adding nickel ferromanganese and ferrosilicon, every stove furnace charge weight is 600kg;
(2) stokehold is adjusted to branch and temperature is risen to 1520 ℃ ~ 1550 ℃ after qualified, adds a small amount of aluminium flake and carries out deoxidation, and deoxidation is after 1 ~ 2 minute, and adding 1.8Kg is the processing of go bad of 5 ~ 25mm vanadium iron piece through preheating, granularity, and the vanadium iron adding was come out of the stove after 1 ~ 2 minute;
(3) be that the rare earth ferrosilicon alloy of 1 ~ 4mm is placed on casting ladle bottom through prebake with the 7.8Kg granularity, with ladle bottom pouring process to the molten iron processing of going bad;
(4) molten iron pouring being become size is the spherical top of Φ 140mm, and molten steel pouring temperature is about 1480 ℃;
(5) sphere of casting top is put in carries out the classification insulation in the high temperature box type resistance furnace and handle.Classification insulation treatment process is: foundry goods is heated to 1100 ℃ of insulation 2h, is chilled to 900 ℃ of insulation 4h with stove, the sand cooling of coming out of the stove, postheating to the 400 ℃ insulation 4h sand cooling of coming out of the stove.
The spherical top of the high-chromium white cast iron that adopts above-mentioned technology to make, basic mechanical performance is as shown in table 1.The metallograph of each embodiment is as shown in Figure 1.Can know by Fig. 1, compare, the spherical top of the high-chromium white cast iron that adopts the present invention to make with traditional technology; Eutectic carbides is more tiny in its tissue; Netted continuity and directivity reduce, and matrix crystal grain attenuates, and after heat treatment separates out a large amount of proeutectoid carbides in the matrix.Associative list 1 and Fig. 1 can know, the spherical top of the high-chromium white cast iron that adopts the present invention to make, and its performance is significantly improved than the sphere top of traditional technology manufacturing, and be more than 2 times of similar domestic and international product work-ing life.Comparison diagram 2 can be known with Fig. 3, adopts the spherical top of high-chromium white cast iron of the present invention's preparation, is difficult in the use significantly distortion and Cracking Failure take place, and result of use is good.
The basic mechanical performance of the spherical top of table 1 high-chromium white cast iron
Claims (2)
1. a high-chromium white cast iron sphere comes directly towards, and it is characterized in that each weight percentages of components is: C 1.8% ~ 2.2%, Cr 16% ~ 22 %, and Si 0.5% ~ 1.0%, and Mn 0.3% ~ 0.6%, and Ni 1.6% ~ 2.2%, and FeSiRE 0.6% ~ 1.5%, and V 0.2% ~ 0.7%, and surplus is an iron.
2. the method for manufacture of the spherical top of the said high-chromium white cast iron of a claim 1 is characterized in that the method for manufacture step is:
(1) adopting the pig iron, low carbon ferrochromium, nickel ferromanganese, steel scrap, ferrosilicon etc. is starting material, prepares burden according to the batching prescription that provides;
(2) the good starting material heat fused of will preparing burden becomes molten iron, and the cast iron melting temperature is 1480 ℃ ~ 1550 ℃, and tapping temperature is about 1500 ℃;
(3) add 0.2% ~ 0.7% vanadium iron and 0.6% ~ 1.5% FeSiRE processing of going bad; Vanadium adopts the mode that directly drops into to add; The mode that FeSiRE adopts the bag end to pour adds; Adopt a small amount of aluminium flake to carry out preliminary dexidation before coming out of the stove, the molten iron after going bad obtains the sphere top of different size through cast, moulding in green sand mold;
(4) thermal treatment process of the present invention's employing is that the classification heat preservation hot is handled; Be about to foundry goods and be heated to 1100 ℃ ~ 1200 ℃ insulation 0.5h ~ 2h; Be chilled to 850 ℃ ~ 950 ℃ insulation 3h ~ 6h with stove, the sand cooling of coming out of the stove, postheating to the 300 ℃ ~ 400 ℃ of insulation 3h ~ 6h sand cooling of coming out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110329664 CN102352460B (en) | 2011-10-26 | 2011-10-26 | High-chromium white cast iron spherical plug and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110329664 CN102352460B (en) | 2011-10-26 | 2011-10-26 | High-chromium white cast iron spherical plug and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102352460A true CN102352460A (en) | 2012-02-15 |
| CN102352460B CN102352460B (en) | 2013-01-09 |
Family
ID=45576096
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110329664 Expired - Fee Related CN102352460B (en) | 2011-10-26 | 2011-10-26 | High-chromium white cast iron spherical plug and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102352460B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111390100A (en) * | 2020-05-13 | 2020-07-10 | 上海长特锻造有限公司 | Forging process of inner star wheel |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102669A (en) * | 1993-11-12 | 1995-05-17 | 中国科学院化学研究所 | Emulsified heavy oil, its prepn. and application |
| JP2001073063A (en) * | 2000-08-14 | 2001-03-21 | Asahi Tec Corp | As-cast ductile cast iron |
| CN1102669C (en) * | 1999-01-28 | 2003-03-05 | 北京科技大学 | Grinding ball of martensite/bainite compounded cast iron and its production technology |
| US20050145362A1 (en) * | 1999-07-29 | 2005-07-07 | Crafton Scott P. | Methods and apparatus for heat treatment and sand removal for castings |
-
2011
- 2011-10-26 CN CN 201110329664 patent/CN102352460B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1102669A (en) * | 1993-11-12 | 1995-05-17 | 中国科学院化学研究所 | Emulsified heavy oil, its prepn. and application |
| CN1102669C (en) * | 1999-01-28 | 2003-03-05 | 北京科技大学 | Grinding ball of martensite/bainite compounded cast iron and its production technology |
| US20050145362A1 (en) * | 1999-07-29 | 2005-07-07 | Crafton Scott P. | Methods and apparatus for heat treatment and sand removal for castings |
| JP2001073063A (en) * | 2000-08-14 | 2001-03-21 | Asahi Tec Corp | As-cast ductile cast iron |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111390100A (en) * | 2020-05-13 | 2020-07-10 | 上海长特锻造有限公司 | Forging process of inner star wheel |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102352460B (en) | 2013-01-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103014550B (en) | High chromium multielement alloy wear resisting ball and manufacturing method thereof | |
| CN101760701B (en) | Alloy-plastic steel plate for die and production method thereof | |
| CN102703816B (en) | High-carbon low-alloy wear-resistant ball steel and production process thereof | |
| CN102107215B (en) | Resource-saving boron-containing high-speed steel composite roll and preparation method thereof | |
| CN101792885B (en) | Hot-rolled round steel for high carbon manganese and chrome grinding ball and method for producing same | |
| CN101962734B (en) | Steel for ball mill steel ball and preparation method thereof | |
| CN102703822B (en) | Preparation method of high-speed steel for composite roll collar | |
| WO2006136079A1 (en) | An austenite-film toughened martensite wear-resisting cast steel and its manufacture process | |
| CN102242314A (en) | Multiple alloy toughened and wear-resistant middle-manganese steel and preparation technology thereof | |
| CN103131938A (en) | Metal type rare earth microalloyed D-type graphite cast iron glass mould and preparation method thereof | |
| CN105441782A (en) | Ductile iron casting and manufacturing method thereof | |
| CN103146988B (en) | Highly thermal-fatigue resistant alloy and spheroidal graphite cast iron glass mold material and preparation method thereof | |
| CN103205605A (en) | High-temperature-oxidation-resistant casting nickel-based alloy and preparation method thereof | |
| CN103014480B (en) | Multielement microalloy low chromium white iron grinding ball and manufacturing method thereof | |
| CN103060662B (en) | A kind of preparation technology of cast alloy iron abrading-ball | |
| CN102534356A (en) | Wear-resistant white cast iron material and preparation method thereof | |
| CN104911504A (en) | High-strength high-wear-resistance steel casting for super-huge type crusher and production process of steel casting | |
| CN107557690A (en) | Low-temperature-resistant and lamellar-tearing-resistant super-thick steel plate and manufacturing method thereof | |
| CN114231856B (en) | Micron carbide reinforced low-density wear-resistant steel and preparation method and application thereof | |
| CN107747031A (en) | A kind of wear-resistant ball of corrosion-resistant low abrasion and preparation method thereof | |
| CN105132792A (en) | High-chromium high-tungsten wear-resisting cast iron plate hammer of crusher and preparation method thereof | |
| CN102352460B (en) | High-chromium white cast iron spherical plug and preparation method thereof | |
| CN104087813B (en) | The extraordinary special mill ball in a kind of mine | |
| CN105039833B (en) | Ferrovanadium chromium antifriction alloy and preparation method thereof | |
| CN103014513A (en) | Novel wear-resistant low alloy Q345C/D steel plate and production method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130109 Termination date: 20161026 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |