CN103602879A - Preparation method for high strength gray cast iron material - Google Patents
Preparation method for high strength gray cast iron material Download PDFInfo
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- CN103602879A CN103602879A CN201310635061.0A CN201310635061A CN103602879A CN 103602879 A CN103602879 A CN 103602879A CN 201310635061 A CN201310635061 A CN 201310635061A CN 103602879 A CN103602879 A CN 103602879A
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Abstract
The invention provides a preparation method for a high strength gray cast iron material. The preparation method comprises the following steps 1) batching; 2) cutting-in of waste steel and ferromanganese before a furnace; and 3) inoculation. According to the invention, inoculation effects are improved by controlling the value of SiC in molten iron and the adjustment value [Mn-Si] of cutting-in ferromanganese in a ladle before the furnace and increasing the degree of supercooling of cutting-in waste steel in the ladle before the furnace, and a mixed nucleating agent composed of 50% of ferrosilicon and 50% of a silicon barium alloy is employed for launder cutting-in inoculation; when carbon equivalent is 3.9 to 4.1% and alloying does not occur, the high-strength HT250 cast iron material can be stably prepared, and the material reaches the following performance indexes tensile strength Sigma[b] is 260 to 275 Mpa, hardness HB is 185 to 220, and pearlite content is greater than 85%.
Description
Technical field
The present invention relates to cast iron materials manufacture field, be specifically related to rush steel scrap, ferromanganese in a kind of control molten iron Si/C value, [Mn-Si] difference and stokehold hot metal ladle, adopt silicon barium and ferrosilicon mixing nucleating agent art of inoculation, prepare the method for HT250 high-strength gray cast iron material.
Background technology
High strength HT250 cast iron has higher intensity, good wear resistance and damping property, and therefore, this material is widely used for manufacturing the casing class formation parts such as engine cylinder-body, cylinder cap and lathe.
At present, during the meehanite cast iron material of preparation HT250, be stable material performance, generally all adopt single or add copper, Chrome metal powder element simultaneously.But the low problem of existence stabilizability while preparing HT250 meehanite cast iron under no-alloyed condition.
Summary of the invention
For the problems referred to above, the object of the present invention is to provide a kind of preparation method of HT250 high-strength gray cast iron material, that control molten iron Si/C value, iato Ladle ferromanganese are adjusted [Mn-Si] difference, iato Ladle steel scrap improves molten iron condensate depression and reaches raising molten steel preparation effect, adopt iron notch once to pour method and breed, stably produce high strength HT250 cast iron materials.
Technical scheme of the present invention is achieved in the following ways: a kind of high-strength gray cast iron material preparation method, comprises the following steps: 1) batching, 2) stokehold rushes steel scrap and ferromanganese, 3) inoculation; It is characterized in that:
1), batching: by weight percentage, base iron composition: C:3.2～3.4%, Si:1.8～2.1%, Mn:0.5～0.7%, sulphur S:0.09～0.12%, phosphorus P:0.10～0.17%, all the other are iron;
2), stokehold rushes steel scrap and ferromanganese: 1450～1460 ℃ of tapping temperatures, in the hot metal ladle of 400-500 ℃ of temperature, put into 3～5% steel scrap, steel scrap adopts general carbon steel, thickness 2～4mm, lumpiness is of a size of 1/5～1/4 of hot metal ladle diameter; While tapping a blast furnace, at iron notch, with stream, pour ferromanganese, the amount of pouring is iron water amount 0.50～0.6%, and ferromanganese granularity is 2～4mm, and [Mn-Si] value is controlled at-1.25～-1.35;
Wherein: ferromanganese is mid-carbon fe-mn FeMn78C2.0, and composition is: 75.0-～82.0%Mn, 2%C, 1.5%Si, 0.25%P, 0.03%S, all the other are iron.
3), inoculation: treatment temp is 1430～1440 ℃, pours after ferromanganese while tapping a blast furnace at iron notch with stream, pours immediately and is mixed the nucleating agent forming by 75 ferrosilicon with Si-Ba alloy; Press molten iron restatement, innoculant adding quantity is 0.5～0.6%, nucleating agent granularity 3～7mm; Mix nucleating agent and consist of 50% ferrosilicon+50% Si-Ba alloy.
Si-Ba alloy composition is: Ba4-6%, and Ca1-2%, Si65-70%, Al1-2%, all the other are iron, ferrosilicon alloy components is: Si72-80%, Cr≤0.5%, P≤0.5%, S≤0.04%, C≤0.02%, all the other are iron, weight of molten iron fluctuation ± 5%.
Beneficial effect of the present invention: adopt and control molten iron Si/C value, iato Ladle ferromanganese adjustment [Mn-Si] value, iato Ladle steel scrap increase condensate depression to improve pregnant effect, the mixing nucleating agent that employing is comprised of 50% ferrosilicon+50% Si-Ba alloy carries out iron notch and pours method and breed, carbon equivalent be 3.9～4.1% and the condition of unalloying under, can stablize and prepare high strength HT250 cast iron materials, material performance index reaches: tensile strength sigma b:260～275Mpa, hardness HB:185～220, content of pearlite in alloy are greater than 85%.
Embodiment
A high-strength gray cast iron material preparation method, comprises the following steps:
1, batching: by weight percentage, base iron composition: C:3.2～3.4%, Si:1.8～2.1%, Mn:0.5～0.7%, sulphur S:0.09～0.12%, phosphorus P:0.10～0.17%, all the other are iron;
2, stokehold rushes steel scrap and ferromanganese: 1450～1460 ℃ of tapping temperatures, put into 3～5%(hot metal ladle capacity in the hot metal ladle of 400-500 ℃ of temperature) steel scrap, steel scrap adopts general carbon steel, thickness 2～4mm, lumpiness is of a size of 1/5～1/4 of hot metal ladle diameter.While tapping a blast furnace, at iron notch, with stream, pour ferromanganese (for proprietary concentrate), the amount of pouring is 0.50～0.6%, and ferromanganese granularity is 2～4mm.[Mn-Si] value is controlled at-1.25～-1.35.
Wherein: ferromanganese is mid-carbon fe-mn FeMn78C2.0, and composition is: 75.0-～82.0%Mn, 2%C, 1.5%Si, 0.25P, 0.03%S, all the other are iron.
3, inoculation: during 1430～1440 ℃ for the treatment of temps, pour after ferromanganese with stream at iron notch while tapping a blast furnace, pour immediately and mixed the nucleating agent forming by 75 ferrosilicon with Si-Ba alloy.Innoculant adding quantity 0.5～0.6%, nucleating agent granularity 3～7mm.Mix nucleating agent and consist of 50% ferrosilicon+50% Si-Ba alloy.Si-Ba alloy article component is: Ba4-6%, and Ca1-2%, Si65-70%, Al1-2%, all the other are iron, ferro-silicon article component is: Si72-80%, Cr≤0.5%, P≤0.5%, S≤0.04%, C≤0.02%, all the other are iron, weight of molten iron fluctuation ± 5%.
The high-strength gray cast iron of gained of the present invention, hot metal composition after processing: C:3.2～3.4%, Si:2.1～2.4%, Mn:0.9～1.1%, sulphur S:0.09～0.12%, phosphorus P:0.10～0.17%, all the other are iron, carbon equivalent was at 3.9～4.05 o'clock, and Si/C value is controlled at 0.73～0.75; Carbon equivalent was at 4.1～4.15 o'clock, and Si/C value is controlled at 0.70～0.72.
Embodiment 1:
Adopt the present invention to manufacture diesel engine flywheel foundry goods, foundry goods organizes content of pearlite in alloy to reach 88%, and performance index reach: tensile strength sigma b:259～266Mpa, hardness HB:185～200.
Claims (3)
1. a high-strength gray cast iron material preparation method, comprises the following steps: 1) batching, 2) stokehold rushes steel scrap and ferromanganese, 3) inoculation; It is characterized in that:
1), batching: by weight percentage, base iron composition: C:3.2～3.4%, Si:1.8～2.1%, Mn:0.5～0.7%, sulphur S:0.09～0.12%, phosphorus P:0.10～0.17%, all the other are iron;
2), stokehold rushes steel scrap and ferromanganese: 1450～1460 ℃ of tapping temperatures, in the hot metal ladle of 400-500 ℃ of temperature, put into 3～5% steel scrap, steel scrap adopts general carbon steel, thickness 2～4mm, lumpiness is of a size of 1/5～1/4 of hot metal ladle diameter; While tapping a blast furnace, at iron notch, with stream, pour ferromanganese, the amount of pouring is iron water amount 0.50～0.6%, and ferromanganese granularity is 2～4mm, and [Mn-Si] value is controlled at-1.25～-1.35;
3), inoculation: treatment temp is 1430～1440 ℃, pours after ferromanganese while tapping a blast furnace at iron notch with stream, pours immediately and is mixed the nucleating agent forming by 75 ferrosilicon with Si-Ba alloy; Innoculant adding quantity is 0.5～0.6%, nucleating agent granularity 3～7mm; Mix nucleating agent and consist of 50% ferrosilicon+50% Si-Ba alloy.
2. a kind of high-strength gray cast iron material preparation method according to claim 1, it is characterized in that: the ferromanganese described step 2) is mid-carbon fe-mn FeMn78C2.0, composition is: 75.0-～82.0%Mn, 2%C, 1.5%Si, 0.25%P, 0.03%S, all the other are iron.
3. a kind of high-strength gray cast iron material preparation method according to claim 1, is characterized in that: described step 3)
In Si-Ba alloy composition be: Ba4-6%, Ca1-2%, Si65-70%, Al1-2%, all the other are iron, ferrosilicon alloy components is: Si72-80%, Cr≤0.5%, P≤0.5%, S≤0.04%, C≤0.02%, all the other are iron, weight of molten iron fluctuation ± 5%.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060155A (en) * | 2014-05-28 | 2014-09-24 | 安徽省瑞顺铸造科技有限公司 | HT250 casting and production method thereof |
| CN104060153A (en) * | 2014-05-28 | 2014-09-24 | 安徽省瑞顺铸造科技有限公司 | HT200 cast piece and production method thereof |
| CN106676250A (en) * | 2016-12-15 | 2017-05-17 | 广西大学 | Thermal treatment method for chilled cast iron roll |
| CN107354374A (en) * | 2017-09-06 | 2017-11-17 | 马鞍山市万兴耐磨金属制造有限公司 | A kind of high-strength abrasion-proof gray cast iron and its current-following inoculation technique |
| CN108311704A (en) * | 2018-01-03 | 2018-07-24 | 湖南精量重工科技有限公司 | A kind of precision casting production technology |
| CN110157975A (en) * | 2019-06-28 | 2019-08-23 | 含山县兴达球墨铸铁厂 | A kind of preparation method of high-strength thin-walled gray iron casting |
| CN112893787A (en) * | 2021-01-18 | 2021-06-04 | 安徽海立精密铸造有限公司 | Inoculation treatment method for high-strength low-stress automobile pressure plate gray iron casting |
| CN114703420A (en) * | 2022-04-01 | 2022-07-05 | 中国第一汽车股份有限公司 | Production method of novel nitrogen-containing commercial vehicle cylinder body material |
| CN115608917A (en) * | 2022-10-26 | 2023-01-17 | 广东富华铸锻有限公司 | Preparation process of high-carbon-equivalent non-alloyed gray cast iron casting |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104060155A (en) * | 2014-05-28 | 2014-09-24 | 安徽省瑞顺铸造科技有限公司 | HT250 casting and production method thereof |
| CN104060153A (en) * | 2014-05-28 | 2014-09-24 | 安徽省瑞顺铸造科技有限公司 | HT200 cast piece and production method thereof |
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| CN104060155B (en) * | 2014-05-28 | 2016-05-18 | 安徽省萧县华龙耐火材料有限责任公司 | A kind of HT250 foundry goods and production method thereof |
| CN106676250A (en) * | 2016-12-15 | 2017-05-17 | 广西大学 | Thermal treatment method for chilled cast iron roll |
| CN107354374A (en) * | 2017-09-06 | 2017-11-17 | 马鞍山市万兴耐磨金属制造有限公司 | A kind of high-strength abrasion-proof gray cast iron and its current-following inoculation technique |
| CN108311704A (en) * | 2018-01-03 | 2018-07-24 | 湖南精量重工科技有限公司 | A kind of precision casting production technology |
| CN110157975A (en) * | 2019-06-28 | 2019-08-23 | 含山县兴达球墨铸铁厂 | A kind of preparation method of high-strength thin-walled gray iron casting |
| CN112893787A (en) * | 2021-01-18 | 2021-06-04 | 安徽海立精密铸造有限公司 | Inoculation treatment method for high-strength low-stress automobile pressure plate gray iron casting |
| CN114703420A (en) * | 2022-04-01 | 2022-07-05 | 中国第一汽车股份有限公司 | Production method of novel nitrogen-containing commercial vehicle cylinder body material |
| CN115608917A (en) * | 2022-10-26 | 2023-01-17 | 广东富华铸锻有限公司 | Preparation process of high-carbon-equivalent non-alloyed gray cast iron casting |
| CN115608917B (en) * | 2022-10-26 | 2023-07-07 | 广东富华铸锻有限公司 | Preparation process of high-carbon equivalent non-alloyed gray cast iron casting |
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Application publication date: 20140226 |