CN101942540A - Novel inoculant for eliminating acicular structures and hardness difference of singly cast piston rings - Google Patents
Novel inoculant for eliminating acicular structures and hardness difference of singly cast piston rings Download PDFInfo
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- CN101942540A CN101942540A CN 201010271251 CN201010271251A CN101942540A CN 101942540 A CN101942540 A CN 101942540A CN 201010271251 CN201010271251 CN 201010271251 CN 201010271251 A CN201010271251 A CN 201010271251A CN 101942540 A CN101942540 A CN 101942540A
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Abstract
The invention discloses a novel inoculant for eliminating acicular structures and hardness difference of singly cast piston rings, comprising metallic stibium (Sb) and a silicon-strontium inoculant with weight ratio of 1:5-20. The novel inoculant dispenses with adjustment of the components of the piston rings and can improve the mechanical performance of the piston rings. Being used in the existing processing methods, the novel inoculant can omit the aging procedure, thus lessening the procedures, saves time and electricity, lowers the production cost and shortens the production period. When the novel inoculant is used, the cost increased in the casting stage is the cost of the consumed Sb.
Description
Technical field
The present invention relates to a kind of a kind of new inoculant of eliminating inblock cast piston ring acicular structure and difference of hardness.
Background technology
In the piston ring cast iron materials, materials such as chrome copper, chromium molybdenum copper alloy, chrome molybdenum, tungsten chrome molybdenum find broad application, but these materials a kind of acicular structure often occurs in the matrix when casting, the particularly slim ring of end face height≤2mm, ubiquity acicular structure especially.The highest meeting of hardness of piston ring surpasses HRB108 when acicular structure occurs, the difference of hardness at 0 °, 90 °, 180 ° three place＞3 a HRB unit, JB/T51105-1999 " the internal-combustion engine piston ring quality product is graded " 3.3.1 stipulates " difference of hardness on the same loop should be less than or equal to 3 HRB stiffness units ".Solving difference of hardness＞3 HRB unit's general method now is: adopt 530-580 ℃ ageing treatment, this method is time-consuming takes; Or adopt and improve C, Si content, graphite is done thick method, the piston ring mechanical property that this method is produced is relatively poor.
Summary of the invention
Goal of the invention: eliminate the acicular structure in inblock cast piston ring (the particularly slim ring) matrix, reduce to reach≤3 HRB units with sheet piston ring difference of hardness.
Technical scheme: in order to solve the problems of the technologies described above, the present invention has adopted following technical scheme:
A kind of new inoculant of eliminating inblock cast piston ring acicular structure and difference of hardness, it comprises metallic antimony and silicon strontium nucleating agent, the weight ratio of metallic antimony and silicon strontium nucleating agent is 1: 5～20.
Wherein, the purity of metallic antimony 〉=99%, granularity is 0.2～5mm.
Wherein, described silicon strontium nucleating agent comprises the component of following weight percent:
Si：70～80％
Ca：0～0.1％
Al：0～0.5％
Sr：0.8～1.5％
Fe：18～29％。
Wherein, the granularity of described silicon strontium nucleating agent: 1～15mm.
The major cause that occurs acicular structure in inblock cast piston ring (the particularly slim ring) matrix is the eutectoid transformation stage of inblock cast piston ring after cast, because it is fast to contain alloying element such as Cr or Mo and speed of cooling, produces a kind of acicular structure of being made up of bainite, martensite and small portion of residual austenite.Silicon strontium nucleating agent is a kind of effective inoculation agent, promotes that graphitizability is very strong, has the good characteristics of homogeneous simultaneously.And add metallic antimony (Sb), and make piston ring when eutectoid transformation, change the eutectoid transformation temperature, promote to generate perlite.Silicon strontium and metallic antimony (Sb) are united use can effectively eliminate acicular structure, reduces the difference of hardness with loop.
Beneficial effect: 1, use the new inoculant of elimination inblock cast piston ring acicular structure of the present invention and difference of hardness, do not need the composition of piston ring is adjusted, not only can not reduce the mechanical property of piston ring, can improve its mechanical property on the contrary.
2, use the new inoculant of elimination inblock cast piston ring acicular structure of the present invention and difference of hardness in existing working method, can cancel the timeliness operation, will lack operation, the power saving that saves time has reduced production cost, has shortened the production cycle.
3, use the present invention, the cost that increases in cast sections is the consuming cost of metallic antimony (Sb), and wherein the silicon strontium is normally to need usefulness, and consumption is identical, so do not increase cost; 0.03% (average consumption) 60 yuan/Kg/1000=0.00072 of * 40g (piston ring weight) * unit/sheet.The timeliness cost is: the electricity charge+artificial+equipment amortization unit/sheet=0.0247 yuan/sheet.Use the present invention to add up to cost-saved: 0.02398 yuan/sheet, to produce 2000 ten thousand in piston ring, cost-saved 479600 yuan per year.
Embodiment:
According to following embodiment, can better understand the present invention.Yet, those skilled in the art will readily understand that the described concrete material proportion of embodiment, processing condition and result thereof only are used to illustrate the present invention, and should also can not limit the present invention described in detail in claims.
Among the following embodiment, the add-on of silicon strontium nucleating agent is 0.1～1% of a weight of molten iron.
Embodiment 1:
Chrome copper material R175 piston ring with production is an example, and the molten iron composition is in the stove:
| Chemical ingredients | C | Si | Mn | P | Cu | Cr | S | Fe |
| Content (%) | 3.8 | 2.4 | 0.8 | 0.35 | 0.45 | 0.25 | 0.02 | Residue |
1560 ℃ of leaving water temperature(LWT)s.In the molten iron of 80Kg, add the new inoculant 430g of elimination inblock cast piston ring acicular structure of the present invention and difference of hardness.Wherein, metallic antimony (Sb) 30g, silicon strontium nucleating agent 400g, metallic antimony (Sb) are that particle diameter is the particle of 0.2mm,, the blending ratio of the two is 1:13.3, adds in the pouring ladle with molten iron stream when going out molten iron.
Wherein, silicon strontium nucleating agent granularity is 1mm, and composition is
| Chemical ingredients | Si | Ca | Al | Sr | Fe |
| Content (%) | 70 | 0.1 | 0.5 | 1.5 | 27.9 |
Result: metallographic structure: graphite is sheet+star graphite; Matrix: perlite+iron phosphide eutectic (ferrite＜1% does not have acicular structure); Hardness: HRB103-105.This piston ring can not carry out ageing treatment.
Comparative Examples 1:
Chrome copper material R175 piston ring with production is an example, and the molten iron composition is with embodiment 1 in the stove.1560 ℃ of leaving water temperature(LWT)s in the molten iron of 80Kg, add silicon strontium nucleating agent 430g.
Wherein, silicon strontium nucleating agent granularity, composition are with embodiment 1.
Result: metallographic structure: graphite is sheet+star graphite; Matrix: perlite+iron phosphide eutectic (ferrite 3-5% has acicular structure); Hardness: HRB104-110 (maximum hardness＞HRB108, and difference of hardness is 6 HRB units, so defective).This piston ring must carry out 530-580 ℃ ageing treatment, to reduce difference of hardness.
Embodiment 2:
W, Cr, Mo alloy material EQD6102 oil ring with production are example, and the molten iron composition is in the stove:
| Chemical ingredients | C | Si | Mn | P | Mo | W | Cr | S | Fe |
| Content (%) | 3.85 | 2.5 | 0.8 | 0.43 | 0.23 | 0.44 | 0.21 | 0.05 | Residue |
1560 ℃ of leaving water temperature(LWT)s.In the molten iron of 80Kg, add the new inoculant 180g of elimination inblock cast piston ring acicular structure of the present invention and difference of hardness.Wherein, metallic antimony (Sb) 30g, silicon strontium nucleating agent 150g, metallic antimony (Sb) are that particle diameter is the particle of 2mm,, the blending ratio of the two is 1: 5, adds in the pouring ladle with molten iron stream when going out molten iron.
Wherein, wherein, silicon strontium nucleating agent granularity is 8mm, and composition is
| Chemical ingredients | Si | Ca | Al | Sr | Fe |
| Content (%) | 75 | 0.08 | 0.02 | 0.9 | 24 |
Result: metallographic structure: graphite is sheet+a small amount of star graphite; Matrix: perlite+iron phosphide eutectic (ferrite＜1% does not have acicular structure); Hardness: HRB99-101.This piston ring can not carry out ageing treatment.
Comparative Examples 2:
With production W, Cr, Mo alloy material EQD6102 oil ring is example, and the molten iron composition is with embodiment 2 in the stove.1560 ℃ of leaving water temperature(LWT)s in the molten iron of 80Kg, add silicon strontium nucleating agent 180g.Wherein, silicon strontium nucleating agent granularity, composition are with embodiment 2.
Result: metallographic structure: graphite is sheet+star graphite; Matrix: perlite+iron phosphide eutectic (ferrite 3-5% has acicular structure); Hardness: HRB99-109 (maximum hardness＞HRB108, and difference of hardness is 10 HRB units, so defective).This piston ring must carry out 530-580 ℃ ageing treatment, to reduce difference of hardness.
Embodiment 3:
Cr, Mo, Cu alloy material 152FM top piston ring with production are example, and the molten iron composition is in the stove:
| Chemical ingredients | C | Si | Mn | P | Mo | Cu | Cr | S | Fe |
| Content (%) | 3.90 | 2.35 | 0.8 | 0.43 | 0.21 | 0.48 | 0.31 | 0.05 | Residue |
1580 ℃ of leaving water temperature(LWT)s.In the molten iron of 80Kg, add the new inoculant 735g of elimination inblock cast piston ring acicular structure of the present invention and difference of hardness.Wherein, metallic antimony (Sb) 35g, silicon strontium nucleating agent 700g, metallic antimony (Sb) are that particle diameter is the particle of 5mm,, the blending ratio of the two is 1: 20, adds in the pouring ladle with molten iron stream when going out molten iron.
Wherein, wherein, silicon strontium nucleating agent granularity is 15mm, and composition is
| Chemical ingredients | Si | Ca | Al | Sr | Fe |
| Content (%) | 80 | 0 | 0 | 1 | 19 |
Result: metallographic structure: graphite is sheet+star graphite; Matrix: perlite+iron phosphide eutectic (ferrite＜1% does not have acicular structure); Hardness: HRB104-106.This piston ring can not carry out ageing treatment.
Comparative Examples 3:
With production Cr, Mo, Cu alloy material 152FM top piston ring is example, and the molten iron composition is with embodiment 3 in the stove.1580 ℃ of leaving water temperature(LWT)s in the molten iron of 80Kg, add silicon strontium nucleating agent 735g.Wherein, silicon strontium nucleating agent granularity, composition are with embodiment 3.
Result: metallographic structure: graphite is sheet+star graphite; Matrix: perlite+iron phosphide eutectic (ferrite 3-5% has acicular structure); Hardness: HRB105-112 (maximum hardness＞HRB108, and difference of hardness is 7 HRB units, so defective).This piston ring must carry out 530-580 ℃ ageing treatment, to reduce difference of hardness.
Claims (4)
1. a new inoculant of eliminating inblock cast piston ring acicular structure and difference of hardness is characterized in that, it comprises metallic antimony and silicon strontium nucleating agent, and the weight ratio of metallic antimony and silicon strontium nucleating agent is 1: 5～20.
2. a kind of new inoculant of eliminating inblock cast piston ring acicular structure and difference of hardness according to claim 1 is characterized in that, the purity of metallic antimony 〉=99%, and granularity is 0.2～5mm.
3. a kind of new inoculant of eliminating inblock cast piston ring acicular structure and difference of hardness according to claim 1 is characterized in that, described silicon strontium nucleating agent comprises the component of following weight percent:
Si：70～80％
Ca：0～0.1％
Al：0～0.5％
Sr：0.8～1.5％
Fe：18～29％。
4. according to claim 1,2 or 3 described a kind of new inoculants of eliminating inblock cast piston ring acicular structure and difference of hardness, it is characterized in that the granularity of described silicon strontium nucleating agent: 1～15mm.
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| CN 201010271251 CN101942540A (en) | 2010-08-31 | 2010-08-31 | Novel inoculant for eliminating acicular structures and hardness difference of singly cast piston rings |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950120A (en) * | 2018-06-29 | 2018-12-07 | 石家庄北科德瑞冶金材料有限公司 | A kind of cast iron silicon-lanthanum-strontium inovulant and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641248A (en) * | 2004-12-07 | 2005-07-20 | 王义波 | Nodular cast iron piston ring |
| CN101643813A (en) * | 2008-08-07 | 2010-02-10 | 遵义金业机械铸造有限公司 | Method for producing high-strength automotive brake hub and casting thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1641248A (en) * | 2004-12-07 | 2005-07-20 | 王义波 | Nodular cast iron piston ring |
| CN101643813A (en) * | 2008-08-07 | 2010-02-10 | 遵义金业机械铸造有限公司 | Method for producing high-strength automotive brake hub and casting thereof |
Non-Patent Citations (3)
| Title |
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| 《现代铸铁》 20001231 林国荣等 含砷、锡、铅、钛球墨铸铁孕育剂的研究 26-29 1-4 , 第3期 2 * |
| 《铸造技术》 20011231 周永寿等 含锑复合孕育剂在柴油机缸体上的应用试验 53-55 1-4 , 第2期 2 * |
| 《铸造设备研究》 20011213 裴国华等 锶硅铁孕育剂在双联熔炼灰铸铁中的应用 34-35、54 3-4 , 第2期 2 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108950120A (en) * | 2018-06-29 | 2018-12-07 | 石家庄北科德瑞冶金材料有限公司 | A kind of cast iron silicon-lanthanum-strontium inovulant and preparation method thereof |
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Application publication date: 20110112 |