A kind of spheroidizing inoculation treatment process of nodular cast iron

A ductile iron and processing technology, applied in the field of metallurgy, can solve problems such as shrinkage porosity prone to occur, and achieve the effects of eliminating shrinkage cavities, improving efficiency and reducing usage.

Active Publication Date: 2019-03-01
JIANGSU HONGDE SPECIAL PARTS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in fact, the external feeding conflicts with the expansion of graphite, and shrinkage defects are more likely to occur

Method used

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  • A kind of spheroidizing inoculation treatment process of nodular cast iron
  • A kind of spheroidizing inoculation treatment process of nodular cast iron
  • A kind of spheroidizing inoculation treatment process of nodular cast iron

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Embodiment

[0020] Scheme 1: The existing pouring wind power 750kw wheel hub, the middle parting, adopts the ceramic tube bottom injection process, and places three heat preservation risers on the top. During the experiment, there are occasional defects larger than φ3-φ5 at the parting surface. meet the requirements.

[0021] Solution 2: In view of the above problems, the smelting process is now changed, as follows:

[0022] A spheroidizing inoculation process for ductile iron, comprising the steps of:

[0023] Step 1. Add in sequence in a pit of the spheroidizing bag: 1% spheroidizing agent B, 0.2% barium silicon inoculant, 0.3% Ba13 long-acting inoculant and pressed iron;

[0024] Step 2: Pour molten iron from the furnace into another pit, add 0.15%-0.3% silicon barium inoculant when tapping the iron, and add 0.1%-0.2% special effect 1# flow inoculant when pouring, in order to ensure spheroidization, the ball The finished molten iron S≤0.012%, Mg=0.040%±0.004.

[0025] The nodularize...

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Abstract

A nodulizing and inoculation process for nodular cast iron, comprising the following steps: step 1, adding 1% of nodulizing agent, 0.2% of silicon barium inoculant, 0.3% of long-acting inoculant, and weight to a pit of a nodulizing ladle in sequence; and step 2, pouring molten iron into another pit from a furnace, adding 0.15%-0.3% of silicon barium inoculant during tapping, and adding 0.1%-0.2% of stream inoculant during pouring, the molten iron obtained after nodulizing comprising no more than 0.012% of S and 0.040+ / -0.004% of Mg in order to ensure nodulizing.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a spheroidizing inoculation treatment process of nodular cast iron. Background technique [0002] As early as the 1950s, many casting professionals proposed to solve the shrinkage cavity and shrinkage defects of ductile iron by rationally using graphite self-expansion. But so far, few people can use it flexibly. [0003] They believe that the stronger the inoculation effect, the more favorable the graphitization; the larger the graphitization expansion, the better the self-feeding effect. It is not known that the time of graphite expansion will affect the feeding effect, and some people even advocate that technological measures should be taken to advance graphitization expansion, balance expansion and contraction in the initial stage of solidification, and reduce external feeding shrinkage, thereby reducing the size of the riser the goal of. But in fact, the external feed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21C1/10C22C33/10C22C37/04
CPCC21C1/10C21C1/105C22C33/10C22C37/04
Inventor 杨金德姜广杰周张松张亚军许玉松陈立新潘冶
Owner JIANGSU HONGDE SPECIAL PARTS CO LTD
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