CN103572150A - Engine air cylinder cover gray cast iron - Google Patents
Engine air cylinder cover gray cast iron Download PDFInfo
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- CN103572150A CN103572150A CN201310475514.8A CN201310475514A CN103572150A CN 103572150 A CN103572150 A CN 103572150A CN 201310475514 A CN201310475514 A CN 201310475514A CN 103572150 A CN103572150 A CN 103572150A
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- cast iron
- engine cylinder
- cylinder cap
- air cylinder
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Abstract
The invention discloses engine air cylinder cover gray cast iron. The engine air cylinder cover gray cast iron comprises a trace amount of Nb element, 3.25%-3.35% of carbon, 1.7%-1.9% of silicon, 0.4%-0.6% of manganese, less than or equal to 0.05% of phosphorous, 0.06%-0.10% of sulfur, 0.15%-0.25% of chromium, 0.6%-0.8% of copper, 0%-0.30% of niobium and the balance of iron. The engine air cylinder gray cast iron meets the production requirements of engine air cylinder covers; the mechanical property and the strength of the gray iron are obviously improved by adding a trace amount of Nb element on the basis of a conventional HT250 material and appropriately adjusting the contents of other elements, so that the gray cast iron is suitable for application in the engine air cylinder covers with relatively high requirements, and the cracking problem caused by the relatively low strength and thermal fatigue of the gray cast iron is solved.
Description
Technical field
The present invention relates to cylinder head casting field, particularly a kind of engine cylinder cap graphitic cast iron.
Background technology
Graphitic cast iron refers to the cast iron with flake graphite, and main component is iron, carbon, silicon, manganese, sulphur, phosphorus, has good mechanical property, castability, damping property, wear resistance and machinability, and low notch sensitivity, is most widely used cast iron.
During engine cylinder cap work, bear very high thermal load and mechanical load, along with engine constantly develops at a high speed to high-power, cylinder head material is proposed to higher requirement, it not only requires higher intensity and toughness, and require heat-resistant anti-fatigue performance good, can under larger thermograde, work.
For the production of the HT250 material of cylinder head, its main chemical compositions scope is as shown in table 1 below at present:
The main chemical compositions scope (wt.%) of table 1.HT250 material
The HT250 material generally adopting is at present in production control, often only control the chemical composition of principal element, and ignore the vital role of some trace element aspect mechanical property (obdurability, high temperature fatigue etc.) and quality of production consistence, stability, this HT250 material can not be met the demands gradually, be badly in need of developing intensity and the more excellent high strength gray iron material of thermal fatigue life.
Summary of the invention
The present invention is in order to overcome defect in above-mentioned prior art, a kind of production requirement that adapts to engine cylinder cap is provided, by adding micro-Nb element on the basis at existing HT250 material, and suitably regulate other constituent contents, improve the engine cylinder cap graphitic cast iron of mechanical property and the intensity of gray iron material.
For achieving the above object, according to the invention provides a kind of engine cylinder cap graphitic cast iron, after adding micro-Nb element, gray iron material composition comprises: carbon 3.25% to 3.35%, silicon 1.7% to 1.9%, manganese 0.4% to 0.6%, phosphorus are less than 0.05%, sulphur 0.06% to 0.10%, chromium 0.15% to 0.25%, copper 0.6% to 0.8%, niobium 0 to 0.30%, and all the other are iron.
In technique scheme, this engine cylinder cap graphitic cast iron adopts medium-frequency induction furnace molten alloy.
In technique scheme, the teeming temperature of this engine cylinder cap graphitic cast iron is 1380-1430 ℃.
In technique scheme, during the grey ferroalloy metallurgy of this engine cylinder cap graphitic cast iron, adding micro-Nb element is to add with ferrocolumbium form.
Compared with prior art, the present invention has following beneficial effect: this engine cylinder cap graphitic cast iron adapts to the production requirement of engine cylinder cap, by adding micro-Nb element on the basis at existing HT250 material, and suitably regulate other constituent contents, significantly improve mechanical property and the intensity of gray iron material, this kind of material can be applicable in the engine cylinder cap of requirements at the higher level, solve at present because the strength of materials and thermal fatigue are compared with the low problem of Cracking causing.
Accompanying drawing explanation
Fig. 1 is the cold shock testing cycle diagram of engine cylinder cap graphitic cast iron of the present invention;
Fig. 2 is engine cylinder cap graphitic cast iron of the present invention " 11 operating mode " testing campaign figure.
Embodiment
Below in conjunction with accompanying drawing, a specific embodiment of the present invention is described in detail, but is to be understood that protection scope of the present invention is not subject to the restriction of embodiment.It will be appreciated that, mentioned in following embodiment of the present invention " on ", D score, " left side ", " right side ", " front " and " reverse side " all take the direction shown in each figure as benchmark, these words that are used for limiting direction are only used to be convenient to explanation, do not represent the restriction to the concrete technical scheme of the present invention.
Engine cylinder cap graphitic cast iron of the present invention adapts to the production requirement of engine cylinder cap, by adding micro-Nb element on the basis at existing HT250 material, and suitably regulates other constituent contents, has improved mechanical property and the intensity of gray iron material.
Detailed description by way of example but unrestriced mode has illustrated the disclosure, should be understood that various aspect of the present disclosure can be by independent realization or the realization of being combined with other aspects below.This specification sheets clearly enables those skilled in the art to manufacture and uses us to believe for new and non-obvious improvement, describe some embodiment, alternative, modification, alternatives and system applies, comprised the current best mode that is considered to carry out the inventive principle of describing in this specification sheets.When describing element or feature and/or embodiment, titled with " one " " one " " be somebody's turn to do " and " described ", be intended to expression and there are one or more in element or feature.Term " comprises " that " comprising " and " having " is intended to is comprising property, and also has extra element or feature beyond being illustrated in those specifically described elements or feature.
This engine cylinder cap graphitic cast iron is on the basis of existing HT250 material, by adding micro-Nb element, and suitably regulate other constituent contents, improve the mechanical property of gray iron material, improve intensity, can be applied in the engine cylinder cap production of requirements at the higher level.
This engine cylinder cap graphitic cast iron adopts medium-frequency induction furnace molten alloy, and teeming temperature is 1380-1430 ℃.By adding micro-Nb element (adding with ferrocolumbium form) when the grey ferroalloy metallurgy, improve material mechanical performance.Add after micro-Nb element and control shown in each main chemical compositions scope according to the form below 2 of gray iron material:
The main chemical compositions scope (wt.%) of table 2.Nb microalloying gray iron material
Add after micro-Nb element, the mechanical property of grey iron alloy has had raising by a relatively large margin, and when Nb constituent content is 0.20%, tensile strength has improved a trade mark, and ballistic work has improved approximately 10%; In addition also significantly improve fatigue lifetime and the thermal fatigue life of gray iron material, this kind of material can be applicable in the engine cylinder cap of requirements at the higher level.The concrete data of mechanical property are as shown in table 3:
The mechanical property of table 3.Nb microalloying gray iron material
Add after micro-Nb element, Nb is enriched in eutectic cell border, and therefore rich Nb is formed at eutectic cell boundary mutually, is strip (comprising Y type and V-type), and length is 2-30 μ m.
In order further to investigate the use properties that adopts Nb micro-alloying Error on Cylinder Head for Gray Iron, select respectively two cylinder head to carry out bench testing checking.
A cylinder head has wherein been carried out to the bench testing of 1000 hours thermal shock weather resistance, and as shown in Figure 1, be 7-9 minute each cycling time to round-robin test working condition chart, do not occur abnormal conditions in process of the test.After off-test, open and inspect and carry out magnetic-particle inspection and bottom surface planeness and detect, do not find the situation that crackle, seepage and planeness are overproof, show that cylinder head passes through this examination, meet service requirements.
An other cylinder head has been carried out to " 11 operating mode " weather resistance bench testing in 2000 hours, and as shown in Figure 2, each loop cycle is 150 minutes to round-robin test working condition chart, does not occur abnormal conditions in process of the test.After off-test, open and inspect and carry out magnetic-particle inspection and bottom surface planeness and detect, do not find the situation that crackle, seepage and planeness are overproof, show that cylinder head passes through this examination, meet service requirements.
To sum up, this engine cylinder cap graphitic cast iron adapts to the production requirement of engine cylinder cap, by adding micro-Nb element on the basis at existing HT250 material, and suitably regulate other constituent contents, significantly improve mechanical property and the intensity of gray iron material, this kind of material can be applicable in the engine cylinder cap of requirements at the higher level, solve at present because the strength of materials and thermal fatigue are compared with the low problem of Cracking causing.
Disclosed is above only several specific embodiment of the present invention, and still, the present invention is not limited thereto, and the changes that any person skilled in the art can think of all should fall into protection scope of the present invention.
Claims (4)
1. an engine cylinder cap graphitic cast iron, it is characterized in that, after adding micro-Nb element, gray iron material composition comprises: carbon 3.25% to 3.35%, silicon 1.7% to 1.9%, manganese 0.4% to 0.6%, phosphorus are less than 0.05%, sulphur 0.06% to 0.10%, chromium 0.15% to 0.25%, copper 0.6% to 0.8%, niobium 0 to 0.30%, and all the other are iron.
2. engine cylinder cap graphitic cast iron according to claim 1, is characterized in that: this engine cylinder cap graphitic cast iron adopts medium-frequency induction furnace molten alloy.
3. engine cylinder cap graphitic cast iron according to claim 2, is characterized in that: the teeming temperature of this engine cylinder cap graphitic cast iron is 1380-1430 ℃.
4. according to the engine cylinder cap graphitic cast iron described in any one in claims 1 to 3, it is characterized in that: during the grey ferroalloy metallurgy of this engine cylinder cap graphitic cast iron, adding micro-Nb element is to add with ferrocolumbium form.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310475514.8A CN103572150A (en) | 2013-10-12 | 2013-10-12 | Engine air cylinder cover gray cast iron |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310475514.8A CN103572150A (en) | 2013-10-12 | 2013-10-12 | Engine air cylinder cover gray cast iron |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975223A (en) * | 2015-06-30 | 2015-10-14 | 柳州金特新型耐磨材料股份有限公司 | Production method of cast iron HT150 |
| CN107345285A (en) * | 2016-05-05 | 2017-11-14 | 通富热处理(昆山)有限公司 | Automobile brake disc alloy gray cast-iron material, automobile brake disc and preparation method thereof |
| CN107365939A (en) * | 2017-08-28 | 2017-11-21 | 广东荻赛尔机械铸造股份有限公司 | Engine is cylinder iron and preparation method thereof |
Citations (3)
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| JP2005525468A (en) * | 2002-05-13 | 2005-08-25 | スカニア シーブイ アクチボラグ（パブル） | Gray cast iron alloy and internal combustion engine casting parts |
| US20080206584A1 (en) * | 2007-02-28 | 2008-08-28 | Jaszarowski James K | High strength gray cast iron |
| CN102864369A (en) * | 2012-09-05 | 2013-01-09 | 陈敏 | Anti-fatigue cast iron alloy |
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2013
- 2013-10-12 CN CN201310475514.8A patent/CN103572150A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005525468A (en) * | 2002-05-13 | 2005-08-25 | スカニア シーブイ アクチボラグ（パブル） | Gray cast iron alloy and internal combustion engine casting parts |
| US20080206584A1 (en) * | 2007-02-28 | 2008-08-28 | Jaszarowski James K | High strength gray cast iron |
| CN102864369A (en) * | 2012-09-05 | 2013-01-09 | 陈敏 | Anti-fatigue cast iron alloy |
Non-Patent Citations (1)
| Title |
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| 李平等: "《高性能灰铸铁材质控制技术与应用》", 30 November 2009, 煤炭工业出版社 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104975223A (en) * | 2015-06-30 | 2015-10-14 | 柳州金特新型耐磨材料股份有限公司 | Production method of cast iron HT150 |
| CN107345285A (en) * | 2016-05-05 | 2017-11-14 | 通富热处理(昆山)有限公司 | Automobile brake disc alloy gray cast-iron material, automobile brake disc and preparation method thereof |
| CN107365939A (en) * | 2017-08-28 | 2017-11-21 | 广东荻赛尔机械铸造股份有限公司 | Engine is cylinder iron and preparation method thereof |
| CN107365939B (en) * | 2017-08-28 | 2019-08-02 | 广东荻赛尔机械铸造股份有限公司 | Engine is cylinder iron and preparation method thereof |
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Application publication date: 20140212 |