CN103805830A - Preparation method for high strength gray cast iron material - Google Patents

Preparation method for high strength gray cast iron material Download PDF

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Publication number
CN103805830A
CN103805830A CN201210447488.3A CN201210447488A CN103805830A CN 103805830 A CN103805830 A CN 103805830A CN 201210447488 A CN201210447488 A CN 201210447488A CN 103805830 A CN103805830 A CN 103805830A
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China
Prior art keywords
ferromanganese
iron
value
cast iron
hot metal
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CN201210447488.3A
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荆泽平
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DANYANG JINXIONG MECHANICAL MANUFACTURING Co Ltd
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DANYANG JINXIONG MECHANICAL MANUFACTURING Co Ltd
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Priority to CN201210447488.3A priority Critical patent/CN103805830A/en
Publication of CN103805830A publication Critical patent/CN103805830A/en
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Abstract

The invention relates to a preparation method for a high strength gray cast iron material in terms of weight percentage. The method comprises the steps of: 1) burdening, 2) jetting of scrap steel and ferromanganese in front of a furnace, and 3) inoculation treatment. By controlling the Si/C value of molten iron, jetting ferromanganese into a ladle in front of the furnace to adjust the [Mn-Si] value, jetting scrap steel into the ladle in front of the furnace to improve the inoculation effect, and adopting a mixed inoculants composed of 50% of ferrosilicon and 50% of silicon barium alloy to perform inoculation by a lander jetting technique, the high strength HT250 cast iron material can stably be prepared under the conditions of a carbon equivalent of 3.9-4.1% and no alloying. The material has performance indexes as the following: tensile strength sigma b is 260-275Mpa, the hardness HB is 185-220, and the pearlite content is more than 85%.

Description

A kind of preparation method of high-strength gray cast iron material
Technical field
The present invention relates to cast iron materials manufacture field, be specifically related to a kind of control in molten iron Si/C value, [Mn-Si] difference and stokehold hot metal ladle and rush steel scrap, ferromanganese, adopt silicon barium to mix art of inoculation with ferrosilicon, 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, when 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 prepare HT250 meehanite cast iron under no-alloyed condition time.
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 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 gray cast iron material.
Technical scheme of the present invention is achieved in the following ways: a kind of preparation method of high-strength gray cast iron material, by weight percentage, comprise the following steps: 1) batching, 2) stokehold rushes steel scrap and ferromanganese, 3) inoculation, it is characterized in that:
1), batching: base iron composition: C:3.2~3.4%, Si:1.8~2.1%, Mn:0.5~0.7%, S:0.09~0.12, P:0.10~0.17, all the other are iron;
Hot metal composition after processing: C:3.2~3.4%, Si:2.1~2.4%, Mn:0.9~1.1%, S:0.09~0.12, P:0.10~0.17, carbon equivalent were 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.
2) stokehold rushes steel scrap and ferromanganese: 1440~1450 ℃ of tapping temperatures, in the hot metal ladle of 300 ℃ of left and right temperature, put into 3~5%, steel scrap adopts general carbon steel, thickness 2~4mm, lumpiness is of a size of 1/4~1/5 of hot metal ladle diameter, while tapping a blast furnace, pour ferromanganese at iron notch with stream, be 0.50~0.6% by the iron water amount amount of pouring, 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, 0.25P, 0.03%S.
3) inoculation: when 1380~1390 ℃ for the treatment of temps, while tapping a blast furnace, pour after ferromanganese with stream at iron notch, pour immediately and mixed the nucleating agent forming by 75 ferrosilicon with Si-Ba alloy, by molten steel quality, innoculant adding quantity 0.5~0.6%, nucleating agent granularity 3~7mm, mixes nucleating agent and consists of 50% ferrosilicon+50% Si-Ba alloy.
Si-Ba alloy composition is: Ba 4-6%, and Ca 1-2%, Si 65-70%, Al1-2%, ferro-silicon article component is: Si72-80%, Cr≤0.5%, P≤0.5%, S≤0.04%, C≤0.02%, 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, adopting the mixing nucleating agent that is made up of 50% ferrosilicon+50% Si-Ba alloy to carry out iron notch pours method and breeds, 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 preparation method for high-strength gray cast iron material, by weight percentage, comprises the following steps:
1, batching: base iron composition: C:3.2~3.4%, Si:1.8~2.1%, Mn:0.5~0.7%, S:0.09~0.12, P:0.10~0.17.
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, carbon equivalent were 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.
2, stokehold rushes steel scrap and ferromanganese: 1440~1450 ℃ of tapping temperatures, in the hot metal ladle of 300 ℃ of left and right temperature, put into the steel scrap of 3~5% (hot metal ladle capacity), steel scrap adopts general carbon steel, thickness 2~4mm, and lumpiness is of a size of 1/4~1/5 of hot metal ladle diameter.While tapping a blast furnace, pouring ferromanganese at iron notch with stream, is 0.50~0.6% by the iron water amount amount of pouring, 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.
3, inoculation: when 1380~1390 ℃ for the treatment of temps, while tapping a blast furnace, pour after ferromanganese with stream at iron notch, pour immediately and mixed the nucleating agent forming by 75 ferrosilicon with Si-Ba alloy, by molten steel quality, innoculant adding quantity 0.5~0.6%, nucleating agent granularity 3~7mm, mixes nucleating agent and consists of 50% ferrosilicon+50% Si-Ba alloy.
Si-Ba alloy composition is: Ba 4-6%, and Ca 1-2%, Si 65-70%, Al1-2%, ferro-silicon article component is: Si72-80%, Cr≤0.5%, P≤0.5%, S≤0.04%, C≤0.02%, weight of molten iron fluctuation ± 5%.

Claims (2)

1. a preparation method for high-strength gray cast iron material, by weight percentage, comprises the following steps: 1) batching, 2) stokehold rushes steel scrap and ferromanganese, 3) inoculation; It is characterized in that:
1), batching: base iron composition: C:3.2~3.4%, Si:1.8~2.1%, Mn:0.5~0.7%, S:0.09~0.12, P:0.10~0.17;
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, carbon equivalent were 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;
2) stokehold rushes steel scrap and ferromanganese: 1440~1450 ℃ of tapping temperatures, in the hot metal ladle of 300 ℃ of left and right temperature, put into the steel scrap of 3~5% (hot metal ladle capacity), steel scrap adopts general carbon steel, thickness 2~4mm, lumpiness is of a size of 1/4~1/5 of hot metal ladle diameter, while tapping a blast furnace, pour ferromanganese at iron notch with stream, be 0.50~0.6% by the iron water amount amount of pouring, ferromanganese granularity is 2~4mm, and [Mn-Si] value is controlled at-1.25~-1.35;
3) inoculation: when 1380~1390 ℃ 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.By molten steel quality, innoculant adding quantity 0.5~0.6%, nucleating agent granularity 3~7mm, mixes nucleating agent and consists of 50% ferrosilicon+50% Si-Ba alloy.
2. the preparation method of a kind of high-strength gray cast iron material according to claim 1, it is characterized in that: described step 2) in ferromanganese be mid-carbon fe-mn FeMn78C2.0, composition is: 75.0-~82.0%Mn, 2%C, 1.5%Si, 0.25P, 0.03%S.
CN201210447488.3A 2012-11-07 2012-11-07 Preparation method for high strength gray cast iron material Pending CN103805830A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
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
CN104109797A (en) * 2014-07-15 2014-10-22 宁国东方碾磨材料股份有限公司 Inoculated cast iron for automotive brake
CN105063464A (en) * 2015-09-16 2015-11-18 四川简阳海特有限公司 Casting technology/method of low-stress cast iron piece

Cited By (6)

* Cited by examiner, † Cited by third party
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
CN104060153B (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 HT200 foundry goods and production method thereof
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
CN104109797A (en) * 2014-07-15 2014-10-22 宁国东方碾磨材料股份有限公司 Inoculated cast iron for automotive brake
CN105063464A (en) * 2015-09-16 2015-11-18 四川简阳海特有限公司 Casting technology/method of low-stress cast iron piece

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