CN1051593A - Low chromium medium-Si, Mo ferrite ductile cast iron - Google Patents
Low chromium medium-Si, Mo ferrite ductile cast iron Download PDFInfo
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- CN1051593A CN1051593A CN 89107331 CN89107331A CN1051593A CN 1051593 A CN1051593 A CN 1051593A CN 89107331 CN89107331 CN 89107331 CN 89107331 A CN89107331 A CN 89107331A CN 1051593 A CN1051593 A CN 1051593A
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- cast iron
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Abstract
A kind of low chromium medium-Si, Mo ferrite ductile cast iron alloy, its Chemical Composition (calculating by weight percentage) is: C:2.0～3.0%; Si:4.5～6.0; Mo0.8～1.6%; Mn:0.06～0.17%; Cr:0.2～0.4%; P:0.03～0.07%; S:0.004～0.02%; Rc:0.04～0.07%; Mg:0.03～0.05%; All the other are Fe.The metallographic structure under as cast condition of this alloy is: based on ferrite, contain a small amount of carbide, graphite is spherical existence, have high temperature tensile strength and anti-hot and cold fragility and resistance of oxidation preferably, machining property is good, is specially adapted to be used as the high-temperature resistance die material in development and small size production.
Description
The present invention is low, and chromium medium-Si, Mo ferrite ductile cast iron belongs to casting alloy.
At present, in the heat-stable material of industrial use, majority belongs to refractory alloy class material and Heat resisting cast steel class material, and mechanical workout is difficulty relatively, and material price is also relatively more expensive.The high ductile cast iron material of introducing among the american documentation literature US4450019 of a kind of resistance toheat is mainly used in the manufacturing automobile exhaust pipe.But this kind material castability is poor, and red brittleness and tensile strength are not high when working under 950 ℃ high temperature, is not suitable for doing the moulding stock of work under the high temperature.
The low chromium medium-Si, Mo ferrite ductile cast iron moulding stock that the objective of the invention is to solve above-mentioned the deficiencies in the prior art and a kind of high temperature resistant (up to 950 ℃) are provided, machinability is good, and anti-hot and cold fragility is good, and tensile strength is higher, materials cost is cheap, and comprehensive Technological Economy is higher.
The present invention is a kind of low chromium medium-Si, Mo ferrite ductile cast iron alloy, it is characterized in that replacing with chromium the content of manganese partly.Cast iron alloy of the present invention, its Chemical Composition (calculating by weight percentage) is: C:2.0～3.0%; Si:4.5～6.0%; Mo:0.8～1.6%; Mn:0.06～0.17%; P:0.03～0.07%; S:0.004～0.02%; Re:0.04～0.07%; Mg:0.03～0.05%; All the other are Fe.
Molybdenum, manganese, chromium and silicon are that cast iron alloy of the present invention is in order to improve its high-temperature behavior, the main adding elements of anti-hot and cold fragility of raising and tensile strength.Improve the content of molybdenum in the alloy, the high temperature tensile strength and the heat-resistant anti-fatigue performance down of alloy improved, but the material cost of alloy is taken also increase thereupon simultaneously.Therefore, take all factors into consideration the Technological Economy of alloy, the content of molybdenum is advisable to be no more than 1.6% in the alloy.
Manganese plays desulfidation in alloy, reducing the content of manganese in alloy is that the present invention is in order to reduce alloy to the susceptibility of crackle and the main method that improves its anti-hot and cold fragility and improve its machining property.The content of manganese in alloy is the highest should not to surpass 0.17%.
Chromium in the present invention is in order to strengthening cast iron alloy resistance of oxidation at high temperature, and the content of chromium should be less than 0.2%, and still, the too high levels of chromium can cause forming free carbide and reduce processibility and other mechanical propertys of alloy.Therefore, the content of chromium is the highest should not surpass 0.4%.Equally, the present invention improves cast iron alloy resistance of oxidation at high temperature with the method for the content of raising silicon, but the too high levels of silicon can increase fragility, and therefore, the content of silicon is advisable with 4.5～6%.
The metallographic structure of this cast iron alloy is mainly ferrite, contains a spot of carbide, and graphite is spherical existence.
Fig. 1 is the present invention's metallographic structure photo under the as cast condition under 100 power microscopes
One embodiment of the present of invention are high-temperature resistance die materials, and its Chemical Composition and use properties are as follows:
Present embodiment is a high-temperature resistance die, is used to use superplastic forming to spread the part of the processing method manufacturing large titanium alloy sheet metal forming of connection.Mold weight reaches 0.5t, and in the part forming process, mould bore 900～950 ℃ temperature in lasting 12～13 hours, and the inflation pressurization continues 2～3 hours, and pressure is 15～17Pa.Mould uses repeatedly through four times, makes accessory size and still meets the requirements.Moulding stock is low chromium medium-Si, Mo ferrite ductile cast iron alloy, and its composition (weight percent) is: C:2.88%; Si:5.09%; Mo:1.46%; Mn:0.15%; Cr:0.34%; P:0.043%; S:0.007%; Mg is residual: 0.031%; Re is residual: 0.057%; All the other are Fe.
Cast iron alloy material of the present invention has high temperature tensile strength and resistance of oxidation preferably, high anti-hot and cold fragility and good creep-resistant property, and the favorable mechanical processing characteristics is arranged, weldability might as well, consider that from the complex art economic performance cast iron alloy of the present invention is specially adapted to be used as resistant to elevated temperatures moulding stock in development and small serial production can obtain higher technical economic benefit.
Claims (2)
1, a kind of medium-Si, Mo ferrite ductile cast iron is characterized in that replacing manganese partly with chromium.
2, medium-Si, Mo ferrite ductile cast iron according to claim 1 is characterized in that its Chemical Composition (calculating by weight percentage) is: C:2.0～3.0%; Si:4.5～6.0%; Mo:0.8～1.6%; Mn:0.06～0.17%; Cr:0.2～0.4%; P:0.03～0.07%; S:0.004～0.02%; Re:0.04～0.07%; Mg:0.03～0.05%; All the other are Fe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89107331 CN1051593A (en) | 1989-11-07 | 1989-11-07 | Low chromium medium-Si, Mo ferrite ductile cast iron |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89107331 CN1051593A (en) | 1989-11-07 | 1989-11-07 | Low chromium medium-Si, Mo ferrite ductile cast iron |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1051593A true CN1051593A (en) | 1991-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89107331 Pending CN1051593A (en) | 1989-11-07 | 1989-11-07 | Low chromium medium-Si, Mo ferrite ductile cast iron |
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| CN (1) | CN1051593A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042657C (en) * | 1996-02-02 | 1999-03-24 | 清华大学 | Bainite nodular graphite cast iron grinding ball |
| CN1313633C (en) * | 2005-05-17 | 2007-05-02 | 上海大学 | Hard hollow alloy ball iron mould material for vehicle mould and its making method |
| CN100529135C (en) * | 2004-11-22 | 2009-08-19 | 乔治·费希尔汽车股份公司 | Spheroidal cast alloy and method for producing cast parts from said spheroidal cast alloy |
| CN101886209B (en) * | 2009-05-15 | 2012-08-22 | 西峡县西泵特种铸造有限公司 | Medium silicon-molybdenum vermicular iron material |
| CN102888551A (en) * | 2012-10-30 | 2013-01-23 | 齐齐哈尔市精铸良铸造有限责任公司 | High-temperature-resistant antioxidant exhaust manifold nodular cast iron and preparation method thereof |
| CN103509992A (en) * | 2013-10-15 | 2014-01-15 | 沈阳工业大学 | Study and preparation of heat-resistant nodular cast iron |
-
1989
- 1989-11-07 CN CN 89107331 patent/CN1051593A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1042657C (en) * | 1996-02-02 | 1999-03-24 | 清华大学 | Bainite nodular graphite cast iron grinding ball |
| CN100529135C (en) * | 2004-11-22 | 2009-08-19 | 乔治·费希尔汽车股份公司 | Spheroidal cast alloy and method for producing cast parts from said spheroidal cast alloy |
| CN1313633C (en) * | 2005-05-17 | 2007-05-02 | 上海大学 | Hard hollow alloy ball iron mould material for vehicle mould and its making method |
| CN101886209B (en) * | 2009-05-15 | 2012-08-22 | 西峡县西泵特种铸造有限公司 | Medium silicon-molybdenum vermicular iron material |
| CN102888551A (en) * | 2012-10-30 | 2013-01-23 | 齐齐哈尔市精铸良铸造有限责任公司 | High-temperature-resistant antioxidant exhaust manifold nodular cast iron and preparation method thereof |
| CN103509992A (en) * | 2013-10-15 | 2014-01-15 | 沈阳工业大学 | Study and preparation of heat-resistant nodular cast iron |
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