Low-silicon nodularizer and preparation method of the low-silicon nodularizer

A nodulizer and silicon content technology, applied in the field of nodularizer for nodular cast iron, can solve the problems of fragility, serious segregation, waste and other problems in the handling process, and achieve the effect of ensuring absolute uniformity, not easy to damage, and improving the quality of nodularization

Active Publication Date: 2013-07-10
上海圣德曼铸造海安有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the existing low-silicon spheroidizers have the following disadvantages: (1) they are fragile during handling and are seriously wasted
(2) The spheroidization rate is unstable during use
(3) Serious segregation during use

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] After uniformly mixing magnesium powder, calcium powder, nodular iron powder (sulfur content≤0.01%), ferrosilicon powder and rare earth powder, the low-silicon nodulizer of the present invention is obtained through high-pressure pressing. During the preparation process, the mixing speed is 100 revolutions per minute, the pressing pressure is 50 tons kPa, and the pressing time is 2 seconds.

[0017] The mass percentages of each component of the prepared low-silicon nodulizer are: 7% magnesium, 6% silicon, 2.5% calcium, 0.5% rare earth, and the rest is iron; the particle size of the low-silicon nodulizer is controlled to be Φ15~ 20mm×15~20mm, its compressive strength is 75Mpa, and the sulfur content is 0.012%.

[0018] The rare earth is Sichuan 50# rare earth

Embodiment 2

[0020] After uniformly mixing magnesium powder, calcium powder, nodular iron powder (sulfur content≤0.01%), ferrosilicon powder and rare earth powder, the low-silicon nodulizer of the present invention is obtained through high-pressure pressing, and magnesium powder, calcium powder, Iron powder, ferrosilicon powder and rare earth powder are uniformly mixed and then pressed under high pressure to obtain the low-silicon spheroidizer of the present invention. During the preparation process, the mixing speed is 100 rpm, the pressing pressure is 50 tons kPa, and the pressing time is 3 seconds.

[0021] The mass percentages of the components of the prepared low-silicon nodulizer are: 9% magnesium, 5% silicon, 2% calcium, 1.5% rare earth, and the rest is iron; the particle size of the low-silicon nodulizer is controlled to be Φ15- 20mm×15~20mm, its compressive strength is 75Mpa, and its sulfur content is 0.010%.

[0022] The rare earth is Sichuan 50# rare earth

Embodiment 3

[0024] After uniformly mixing magnesium powder, calcium powder, nodular iron powder (sulfur content≤0.01%), ferrosilicon powder and rare earth powder, the low-silicon nodulizer of the present invention is obtained through high-pressure pressing, and magnesium powder, calcium powder, Iron powder, ferrosilicon powder and rare earth powder are uniformly mixed and then pressed under high pressure to obtain the low-silicon spheroidizer of the present invention. During the preparation process, the mixing speed is 100 rpm, the pressing pressure is 50 tons kPa, and the pressing time is 2.5 seconds.

[0025] The mass percentages of the components of the prepared low-silicon nodulizer are: 8% magnesium, 4% silicon, 1.5% calcium, 1% rare earth, and the rest is iron; the particle size of the low-silicon nodulizer is controlled to be Φ15~ 20mm×15~20mm, its compressive strength is 75Mpa, and its sulfur content is 0.010%.

[0026] The rare earth is Sichuan 50# rare earth.

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Abstract

The invention relates to a low-silicon nodularizer and a preparation method of the low-silicon nodularizer. The low-silicon nodularizer contains the components in mass percent as follows: 7-9% of magnesium, 4-6% of silicon, 1.5-2.5% of calcium, 0.5-1.5% of rare earth and the rest of iron. The granularity Phi of the low-silicon nodularizer is 15-20mm*15-20mm, the compressive strength is greater than or equal to 75Mpa and the content of sulphur is less than or equal to 0.02%. The low-silicon nodularizer has low content of sulphur, less interference to nodulizing elements and high compressive strength, is not damaged easily during production and transport, reacts stably, and effectively improves the quality of nodulization; and mixed production in small batches is adopted and the components are uniform.

Description

technical field [0001] The invention relates to a nodulizer for ductile iron, in particular to a low-silicon nodulizer and a preparation method thereof. Background technique [0002] Due to the low process yield rate of auto ductile iron parts, a large amount of recycled materials will be generated. In the production of ductile iron, due to the limitation of silicon in front of the furnace, a large amount of recycled materials cannot be used. The greater the output of ductile iron, the more the recycled materials will be accumulated. The low-silicon nodulizer contains only about 5% silicon, which is far lower than that of ordinary magnesium-silicon-iron alloy nodulizers. Part of the low-silicon nodulizer used in the production of ductile iron can increase the proportion of recycled materials, thereby increasing the use of nodular iron recycled materials. , to reduce the inventory accumulation of returned materials. [0003] However, the existing low-silicon spheroidizers h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C33/08C22C33/10C21C1/10
Inventor 陈培忠龚华林王建生李安顺
Owner 上海圣德曼铸造海安有限公司
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