CN103924148A - A large section and low temperature nodular cast iron and casting method thereof - Google Patents
A large section and low temperature nodular cast iron and casting method thereof Download PDFInfo
- Publication number
- CN103924148A CN103924148A CN201410099793.7A CN201410099793A CN103924148A CN 103924148 A CN103924148 A CN 103924148A CN 201410099793 A CN201410099793 A CN 201410099793A CN 103924148 A CN103924148 A CN 103924148A
- Authority
- CN
- China
- Prior art keywords
- cast iron
- large section
- spheroidal graphite
- graphite cast
- iron
- 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.)
- Pending
Links
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a large section and low temperature nodular cast iron and a casting method thereof. According to the present invention, the reasonable ratio of various elements in nodular cast iron is controlled, a wire feeding method is adopted to carry out a nodularization treatment, and instantaneous inoculation is adopted to obtain the round and small graphite balls; alloy elements are not added, such that the produced low temperature nodular cast iron has characteristics of strong impact resistance and the like at a low temperature of -20 to -40 DEG C; and the large section and low temperature nodular cast iron has characteristics of low manufacturing cost and excellent mechanical performance, and is especially for production of the low temperature and large section nodular cast iron wind turbine main shaft.
Description
[technical field]
The present invention relates to a kind of cast iron and castmethod thereof, relate in particular to and a kind ofly can be operated in spheroidal graphite cast iron and the castmethod thereof that-20 DEG C～-40 DEG C wall thickness at temperature exceed 200mm.
[background technology]
Known, in wind power generating set, the effect of main shaft is to connect wind wheel and wheel casing, generally be arranged on tens meters of even high-altitudes of up to a hundred meters, and high aerial temperature can be low to moderate-20～-40 DEG C, and wind speed changes greatly, in order to reduce the production cost of wind power generating set, require the life-span of main shaft to be conventionally not less than 20 years, the inefficacy but if main shaft meets accident, replacement charge and associated loss are huge, so the main shaft of wind power generating set is high to material performance requirement, must meet high-fatigue strength and low brittle fracture sensitivity requirement, at present, conventional material is mainly forged steel pieces, but forging production technique complexity, formed product rate is not high, following process high material consumption etc., in order to improve the defect of forged steel pieces, replace forged steel pieces with spheroidal graphite cast iron, because spheroidal graphite cast iron has the advantages that production cost is low, mechanical property is excellent, at present for casting some stressed complexity, the part that intensity, toughness, wear resistance are had relatively high expectations, and adopted QT400-18AL to replace general forged steel pieces for some conventional wind power generating set with spindle material, effectively reduce production cost, shorten the production cycle, created considerable economic benefit, and for the main shaft in some MW class wind turbine groups, the weight of its main shaft is tens tons even tens tons, main wall thickness exceedes 200mm, belong to thick and large section, the materials and methods of producing at present this type of spheroidal graphite cast iron main shaft is easy to occur graphite morphology, number of graphite ball reduces and forms the defects such as shrinkage cavity shrinkage porosity, and is difficult to ensure UT (Ultrasonic Testing) and magnetic-particle inspection requirement etc.
[summary of the invention]
For overcoming the deficiency existing in background technology, the invention provides a kind of large section low-temperature ball spheroidal graphite cast iron and castmethod thereof, the present invention is by adopting injection feeding technology to carry out spheroidizing, can obtain rounding, tiny graphite pebbles by instant inoculation, the present invention simultaneously does not add alloying element, just can make the low-temperature ball spheroidal graphite cast iron of producing have stronger impact resistance etc. under-20～-40 DEG C of low temperature, the present invention has low cost of manufacture, the feature of mechanical property excellence.
For realizing goal of the invention as above, the present invention adopts technical scheme as described below:
A kind of large section low-temperature ball spheroidal graphite cast iron, in described spheroidal graphite cast iron, each element comprises by weight percentage:
Carbon 3.4～3.8%;
Silicon 1.7～2.0%;
Manganese < 0.2%;
Phosphorus < 0.04%;
Sulphur < 0.012%;
Magnesium 0.04～0.07%;
Rare earth 0.01～0.03%;
Surplus is iron.
A castmethod for large section low-temperature ball spheroidal graphite cast iron, said method comprising the steps of:
The first step, first the new pig iron, steel scrap are dropped into heat fused in medium-frequency induction furnace, after fusing, continue to be heated to 1500 DEG C～1510 DEG C, keep 5～10 minutes;
Second step, connect step, take the slag on iron liquid surface with instrument off;
The 3rd step, the iron liquid casting spectrum samples that second step is obtained, carry out composition analysis with spectrum analyzer;
The 4th step, according to the spectroscopic analysis result of obtaining in the 3rd step, add respectively appropriate carbon and silicon;
The 5th step, connect step, stop heating, in the time that iron liquid temp is down to 1420 DEG C～1450 DEG C, except de-iron liquid surface slag, come out of the stove;
The 6th step, connect step, be down to after 1350 DEG C～1380 DEG C until temperature, molten iron carries out injection feeding technology nodularization and inoculation at spheroidizing station, and takes liquid level slag off;
The 7th step, connect step, nucleating agent is placed in to runner box and carries out instant inoculation;
The 8th step, connect step, pour into a mould, obtain large section low-temperature ball spheroidal graphite cast iron.
The castmethod of described large section low-temperature ball spheroidal graphite cast iron, the medium-frequency induction furnace in the described the first step is that Suzhou Zhenwu Electric Stove Co., Ltd produces, and adopts the DX series variable-frequency power sources of powering more.
The castmethod of described large section low-temperature ball spheroidal graphite cast iron, the spectrum analyzer in described the 3rd step is that German OBLF company produces, model is QSN750.
The castmethod of described large section low-temperature ball spheroidal graphite cast iron, the nucleating agent in described the 7th step is high calcium barium nucleating agent, described high calcium barium nucleating agent is block, is layered in advance in runner box.
Adopt technical scheme as above, the present invention has superiority as described below:
The large section low-temperature ball spheroidal graphite cast iron of one of the present invention and castmethod thereof, the present invention is by adopting injection feeding technology to carry out spheroidizing, can obtain rounding, tiny graphite pebbles by instant inoculation, the present invention simultaneously does not add alloying element, just can make the low-temperature ball spheroidal graphite cast iron of producing there is stronger impact resistance etc. under-20～-40 DEG C of low temperature, the present invention has low cost of manufacture, and the feature of mechanical property excellence is specially adapted to make the wind driven generator principal shaft of the large section nodular graphite cast iron of low temperature.
[embodiment]
Can explain in more detail the present invention by the following examples, the present invention is not limited to the following examples;
The large section low-temperature ball spheroidal graphite cast iron of one of the present invention, in described spheroidal graphite cast iron, each element comprises by weight percentage:
Carbon 3.4～3.8%;
Silicon 1.7～2.0%;
Manganese < 0.2%;
Phosphorus < 0.04%;
Sulphur < 0.012%;
Magnesium 0.04～0.07%;
Rare earth 0.01～0.03%;
Surplus is iron.
The castmethod of implementing a kind of a kind of large section low-temperature ball spheroidal graphite cast iron of large section low-temperature ball spheroidal graphite cast iron, said method comprising the steps of:
The first step, first the new pig iron, steel scrap are dropped into heat fused in medium-frequency induction furnace, after fusing, continue to be heated to 1500 DEG C～1510 DEG C, keep 5～10 minutes, in order better to implement the present invention, described medium-frequency induction furnace is that Suzhou Zhenwu Electric Stove Co., Ltd produces, and adopts the DX series variable-frequency power sources of powering more;
Second step, connect step, take the slag on iron liquid surface with instrument off;
The 3rd step, the iron liquid casting spectrum samples that second step is obtained, carry out composition analysis with spectrum analyzer, and in order better to implement the present invention, described spectrum analyzer is that German OBLF company produces, and model is QSN750;
The 4th step, according to the spectroscopic analysis result of obtaining in the 3rd step, add respectively appropriate carbon and silicon;
The 5th step, connect step, stop heating, in the time that iron liquid temp is down to 1420 DEG C～1450 DEG C, except de-iron liquid surface slag, come out of the stove;
The 6th step, connect step, be down to after 1350 DEG C～1380 DEG C until temperature, molten iron carries out injection feeding technology nodularization and inoculation at spheroidizing station, and takes liquid level slag off;
The 7th step, connect step, nucleating agent is placed in to runner box and carries out instant inoculation, described nucleating agent is high calcium barium nucleating agent, and described high calcium barium nucleating agent is block, is layered in advance in runner box;
The 8th step, connect step, pour into a mould, obtain large section low-temperature ball spheroidal graphite cast iron.
Specific embodiments of the invention are as follows:
The spheroidal graphite casting gross weight 16t that produces wind driven generator principal shaft, wherein each element is by weight percentage:
Carbon 3.43%;
Silicon 1.78%;
Manganese 0.19%;
Phosphorus 0.03%;
Sulphur 0.011%;
Magnesium 0.062%;
Rare earth 0.019%;
Surplus is iron.
Castmethod is:
The first step, the new pig iron, steel scrap are dropped into heat fused in medium-frequency induction furnace successively, after fusing, continue to be heated to 1500 DEG C～1510 DEG C, keep 5 minutes;
Second step, connect step, take the slag on iron liquid surface with instrument off;
The 3rd step, the iron liquid casting spectrum samples that second step is obtained, carry out composition analysis with spectrum analyzer;
The 4th step, according to the spectroscopic analysis result of obtaining in the 3rd step, add respectively appropriate carbon, silicon;
The 5th step, connect step, stop heating, in the time that iron liquid temp is down to 1430 DEG C, remove molten iron surface slag, come out of the stove;
The 6th step, connect step, be down to after 1360 DEG C until temperature, molten iron carries out injection feeding technology nodularization and inoculation at spheroidizing station, and takes liquid level slag off.
The 7th step, connect step, high calcium barium inoculant block is placed in to runner box and carries out instant inoculation;
The 8th step, connect step, pour into a mould, obtaining can be at the large section low-temperature ball spheroidal graphite cast iron of-20～-40 DEG C of work.
The performance that records above-mentioned foundry goods according to GB/T 228.1-2010 is: tensile strength is 430MPa, and yield strength is 305MPa, and unit elongation is 18%; The ballistic work that records foundry goods according to GB/T 229 is 12J; Recording foundry goods metallographic structure matrix according to GB/T 9441-2009 is ferrite 95%, 5 grades of graphite sizes, 2 grades of nodulizing grades; Do not find to exceed the casting flaw of 2 grades according to EN 12680-3-2003 UT (Ultrasonic Testing).
Part not in the detailed description of the invention is prior art.
The embodiment selecting in this article for open object of the present invention, currently thinks suitablely, still, will be appreciated that, the present invention is intended to comprise that all belong to all changes and the improvement of the embodiment in this design and invention scope.
Claims (5)
1. a large section low-temperature ball spheroidal graphite cast iron, is characterized in that: in described spheroidal graphite cast iron, each element comprises by weight percentage:
Carbon 3.4～3.8%;
Silicon 1.7～2.0%;
Manganese < 0.2%;
Phosphorus < 0.04%;
Sulphur < 0.012%;
Magnesium 0.04～0.07%;
Rare earth 0.01～0.03%;
Surplus is iron.
2. the castmethod of a kind of large section low-temperature ball spheroidal graphite cast iron of a kind of large section low-temperature ball spheroidal graphite cast iron according to claim 1, is characterized in that: said method comprising the steps of:
The first step, first the new pig iron, steel scrap are dropped into heat fused in medium-frequency induction furnace, after fusing, continue to be heated to 1500 DEG C～1510 DEG C, keep 5～10 minutes;
Second step, connect step, take the slag on iron liquid surface with instrument off;
The 3rd step, the iron liquid casting spectrum samples that second step is obtained, carry out composition analysis with spectrum analyzer; The 4th step, according to the spectroscopic analysis result of obtaining in the 3rd step, add respectively appropriate carbon and silicon;
The 5th step, connect step, stop heating, in the time that iron liquid temp is down to 1420 DEG C～1450 DEG C, except de-iron liquid surface slag, come out of the stove;
The 6th step, connect step, be down to after 1350 DEG C～1380 DEG C until temperature, molten iron carries out injection feeding technology nodularization and inoculation at spheroidizing station, and takes liquid level slag off;
The 7th step, connect step, nucleating agent is placed in to runner box and carries out instant inoculation;
The 8th step, connect step, pour into a mould, obtain large section low-temperature ball spheroidal graphite cast iron.
3. the castmethod of large section low-temperature ball spheroidal graphite cast iron according to claim 2, is characterized in that: the medium-frequency induction furnace in the described the first step is that Suzhou Zhenwu Electric Stove Co., Ltd produces, and adopts the DX series variable-frequency power sources of powering more.
4. the castmethod of large section low-temperature ball spheroidal graphite cast iron according to claim 2, is characterized in that: the spectrum analyzer in described the 3rd step is that German OBLF company produces, and model is QSN750.
5. the castmethod of large section low-temperature ball spheroidal graphite cast iron according to claim 2, is characterized in that: the nucleating agent in described the 7th step is high calcium barium nucleating agent, and described high calcium barium nucleating agent is block, is layered in advance in runner box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099793.7A CN103924148A (en) | 2014-03-18 | 2014-03-18 | A large section and low temperature nodular cast iron and casting method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410099793.7A CN103924148A (en) | 2014-03-18 | 2014-03-18 | A large section and low temperature nodular cast iron and casting method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103924148A true CN103924148A (en) | 2014-07-16 |
Family
ID=51142537
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410099793.7A Pending CN103924148A (en) | 2014-03-18 | 2014-03-18 | A large section and low temperature nodular cast iron and casting method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103924148A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561431A (en) * | 2014-12-26 | 2015-04-29 | 宁夏共享装备有限公司 | Production method of spheroidal graphite cast iron with thick large section |
| CN105950814A (en) * | 2016-07-05 | 2016-09-21 | 潍柴动力股份有限公司 | Production method for high-strength high-elongation spheroidal graphite cast iron |
| CN108531803A (en) * | 2018-05-18 | 2018-09-14 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN109518073A (en) * | 2018-11-26 | 2019-03-26 | 中信重工机械股份有限公司 | A kind of zigzag spheroidal graphite cast-iron platform and its casting method |
| CN110284052A (en) * | 2019-06-25 | 2019-09-27 | 天津昌昊实业有限公司 | A kind of low-temperature ball spheroidal graphite cast iron and its preparation method and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4874576A (en) * | 1988-01-23 | 1989-10-17 | Metallgesellschaft Aktiengesellschaft | Method of producing nodular cast iron |
| JPH0841581A (en) * | 1994-08-02 | 1996-02-13 | Fukushima Seiko Kk | Spheroidal graphite cast iron and its production |
| CN101363097A (en) * | 2008-10-07 | 2009-02-11 | 辽宁隆达集团百星达铸造有限责任公司 | Low-temperature impact resistant as-cast ductile iron with big section and production method thereof |
| CN101787403A (en) * | 2010-01-29 | 2010-07-28 | 河北工业大学 | Short process production technique for preparing casting of wind power generation equipment |
| CN102703802A (en) * | 2012-06-08 | 2012-10-03 | 上海宏钢电站设备铸锻有限公司 | High-strength high-toughness low-temperature-resistant ferritic nodular cast iron |
-
2014
- 2014-03-18 CN CN201410099793.7A patent/CN103924148A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4874576A (en) * | 1988-01-23 | 1989-10-17 | Metallgesellschaft Aktiengesellschaft | Method of producing nodular cast iron |
| JPH0841581A (en) * | 1994-08-02 | 1996-02-13 | Fukushima Seiko Kk | Spheroidal graphite cast iron and its production |
| CN101363097A (en) * | 2008-10-07 | 2009-02-11 | 辽宁隆达集团百星达铸造有限责任公司 | Low-temperature impact resistant as-cast ductile iron with big section and production method thereof |
| CN101787403A (en) * | 2010-01-29 | 2010-07-28 | 河北工业大学 | Short process production technique for preparing casting of wind power generation equipment |
| CN102703802A (en) * | 2012-06-08 | 2012-10-03 | 上海宏钢电站设备铸锻有限公司 | High-strength high-toughness low-temperature-resistant ferritic nodular cast iron |
Non-Patent Citations (4)
| Title |
|---|
| 中国铸造协会: "《铸造技术应用手册 第1卷 铸铁》", 30 June 2012, 中国电力出版社 * |
| 俞旭如等: "风电球墨铸铁件生产技术及最新发展", 《现代铸铁》 * |
| 夏青等: "铸态铁素体球墨铸铁生产工艺的研究", 《铸造》 * |
| 尤明: "大型风电主轴球铁铸件的生产工艺和质量控制", 《现代铸铁》 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104561431A (en) * | 2014-12-26 | 2015-04-29 | 宁夏共享装备有限公司 | Production method of spheroidal graphite cast iron with thick large section |
| CN105950814A (en) * | 2016-07-05 | 2016-09-21 | 潍柴动力股份有限公司 | Production method for high-strength high-elongation spheroidal graphite cast iron |
| CN108531803A (en) * | 2018-05-18 | 2018-09-14 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN108531803B (en) * | 2018-05-18 | 2019-11-22 | 中信重工机械股份有限公司 | A kind of casting method of spheroidal graphite cast-iron valve body |
| CN109518073A (en) * | 2018-11-26 | 2019-03-26 | 中信重工机械股份有限公司 | A kind of zigzag spheroidal graphite cast-iron platform and its casting method |
| CN109518073B (en) * | 2018-11-26 | 2021-04-13 | 中信重工机械股份有限公司 | Z-shaped nodular cast iron platform and casting method thereof |
| CN110284052A (en) * | 2019-06-25 | 2019-09-27 | 天津昌昊实业有限公司 | A kind of low-temperature ball spheroidal graphite cast iron and its preparation method and application |
| CN110284052B (en) * | 2019-06-25 | 2020-07-07 | 天津昌昊实业有限公司 | Low-temperature nodular cast iron and preparation method and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103924148A (en) | A large section and low temperature nodular cast iron and casting method thereof | |
| CN101906566B (en) | Preparation method of low temperature spherical iron casting for 3 MW wind power wheel hub as well as additive, nodulizing agent, inoculant and instantaneous inoculant for founding | |
| CN101585075B (en) | Sand-faced metal mould casting method for manufacturing aerogenerator mainshaft by ductile cast iron | |
| CN104152792A (en) | Ausferrite ductile cast iron grinding ball | |
| CN100473737C (en) | Wear-resistant bainite cast steel liner plate and manufacture process thereof | |
| CN103757172A (en) | Method for preparing nodular cast iron | |
| CN102268521A (en) | Heat treatment process for alloy nodular cast iron swash plate | |
| CN103436766A (en) | Preparation method for nickel-chrome-containing alloy steel | |
| CN101585071B (en) | Expendable pattern casting method for manufacturing aerogenerator mainshaft by ductile cast iron | |
| CN107598086A (en) | The integral casting method of the middle pan of scraper conveyor | |
| CN101824584A (en) | High-performance granular bainite rail steel and production process | |
| CN102373364B (en) | Wind-power equipment casting and manufacturing method thereof | |
| CN102965565B (en) | Wear resistant alloy, silicon alloy abrading-ball, silicon alloy mill section and preparation method | |
| CN103014478B (en) | Short-process semi-solid cast wear-resistant ball and manufacturing method thereof | |
| CN104384442B (en) | A kind of preparation method of calcium carbide pot | |
| CN101660083B (en) | High-performance vermicular cast iron for oven protecting iron pieces of coke oven | |
| CN102296241A (en) | Low carbon alloy cast steel and preparation method thereof | |
| CN104148609B (en) | A kind of manufacture method of die casting machine injection drift | |
| CN102615255A (en) | Special nodulizer for low-temperature impact resistant and high-ductility nodular cast iron and method for preparing special nodulizer | |
| CN101478191B (en) | Process for producing wind power generator by casting technique | |
| CN105648347B (en) | A kind of high-wear-resistant alloy steel liner plate production technology | |
| CN101722290B (en) | Preparation method of multicomponent indefinite chilled ductile iron wear resistance roller | |
| CN101708539B (en) | Manufacture method of multi-element chilled cast iron anti-wear roller ring | |
| CN103667859A (en) | Multi-component low-melting-point fine-grain non-net medium-chromium cast iron and preparation method thereof | |
| CN103343260A (en) | Manganese-copper alloy glass mold |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140716 |