Nodulizing and inoculating treatment process for nodular cast iron

A technology of nodular cast iron and spheroidization inoculation, applied in the field of metallurgy, can solve problems such as shrinkage porosity, and achieve the effects of eliminating shrinkage holes, improving efficiency and reducing production costs.

Active Publication Date: 2017-08-15
JIANGSU HONGDE SPECIAL PARTS CO LTD
View PDF1 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in fact, the external feeding conflicts with the expansio

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Nodulizing and inoculating treatment process for nodular cast iron
  • Nodulizing and inoculating treatment process for nodular cast iron
  • Nodulizing and inoculating treatment process for nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Granularityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a nodulizing and inoculating treatment process for nodular cast iron. The process includes the following steps that firstly, 1% of a nodulizing agent B, 0.2% of a Si-Ba nucleating agent, 0.3% of a Ba13 long-acting nucleating agent and press iron are sequentially added into a pit of a nodulizing package; and secondly, molten iron is poured into another pit from a furnace, 0.15%-0.3% of a Si-Ba nucleating agent is added during tapping, 0.1%-0.2% of a special-effect 1# metal-stream nucleating agent is added during pouring, and in order to guarantee nodulizing, molten iron obtained after nodulizing contains no more than 0.012% of S and 0.040+/-0.004% of Mg. The special nodulizing and inoculating modes are adopted, so that the graphite precipitation peak is delayed to the later solidification period from the early solidification period of a casting, that is, most graphitizing expansion is delayed to the later solidification period when an inlet and an outlet of a cavity are solidified and closed, external liquid feeding is stopped and self-feeding can only be conducted through graphitizing expansion, and thus expansion is made to eliminate the shrinkage cavity and porosity more effectively.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap