Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Spheroidizing agent for thick and large section nodular iron casting and preparing method of spheroidizing agent

A technology of large-section, ductile iron pieces, applied in the field of ductile iron casting, can solve the problems of chemical composition segregation, coarse structure, and graphite distortion.

Inactive Publication Date: 2018-01-23
ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For thick and large section ductile iron castings with thick section, slow cooling rate and long solidification time, graphite distortion, graphite floating, coarse structure, chemical composition segregation and intergranular carbides are easy to occur at the wall thickness or hot joint of the casting. The nodulizer could not meet the production demand, so a new nodulizer was specially developed

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

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] The present invention also provides a method for preparing the nodulizer for ductile iron parts with thick and large cross-section as described above, the preparation method comprising: (1) according to the chemical composition and mass percentage of the nodulizer for ductile iron parts with thick and large cross-section Weighing raw materials for blending; (2) smelting the blended raw materials; (3) pouring, cooling, crushing and granulating the smelted product. For example, the chemical composition and mass percentage here can be obtained by formulating and calculating according to the content of each element in the raw materials used, as long as those skilled in the art can understand the method can be used here.

[0017] For the raw material of the nodularizing agent for thick and large section ductile iron parts, those skilled in the art can adjust it within a wide range. In order to improve the roundness of graphite spheres, in thick and large section ductile iron,...

Embodiment 1

[0025] A preparation method for a nodularizing agent for thick and large-section ductile iron parts, the preparation method comprising:

[0026] (1) According to the chemical composition and mass percentage of the nodularizer for thick and large section ductile iron parts, the raw materials are weighed for deployment. The total weight of the nodularizer for thick and large section ductile iron parts is 100%. The chemical composition of the nodulizer includes: 7.2% Mg, 1.8% RE, 1.9% Ca, 1.2% Ba, 40.8% Si, 0.4% Bi, 0.3% Sb, and the balance is Fe;

[0027] (2) Smelting the prepared raw materials at 1500°C;

[0028] (3) The smelt is poured at 1530° C., cooled, crushed and granulated.

Embodiment 2

[0030] A preparation method for a nodularizing agent for thick and large-section ductile iron parts, the preparation method comprising:

[0031](1) According to the chemical composition and mass percentage of the nodularizer for thick and large section ductile iron parts, the raw materials are weighed for deployment. The total weight of the nodularizer for thick and large section ductile iron parts is 100%. The chemical composition of the nodulizer includes: 7.8% Mg, 2.6% RE, 2.3% Ca, 1.8% Ba, 41.6% Si, 0.6% Bi, 0.5% Sb, and the balance is Fe;

[0032] (2) Smelting the prepared raw materials at 1520°C;

[0033] (3) The smelt is poured at 1550° C., cooled, crushed and granulated.

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
Tensile strengthaaaaaaaaaa
Yield strengthaaaaaaaaaa
Tensile strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a spheroidizing agent for a thick and large section nodular iron casting. With the total weight of the spheroidizing agent for the thick and large section nodular iron castingbeing 100%, the spheroidizing agent for the thick and large section nodular iron casting comprises, by weight, 7-8% of Mg, 1.5-3.0% of RE, 1.5-2.5% of Ca, 1.0-2.0% of Ba, 40-42% of Si, 0.3-0.8% of Bi,0.15-0.6% of Sb and the balance Fe. The advantages of each chemical component are maintained effectively, the effect of excessively high content and excessively low content on the spheroidizing effect of the thick and large section nodular iron casting is prevented, graphite nucleation can be promoted, chilling tendency is reduced, the amount and density of spherulitic graphite are increased, thesize of the spherulitic graphite is reduced, nucleated cast iron can be good in component uniformity, the melting point and the performance are sharply improved, and the elongation of ferrites is improved.

Description

technical field [0001] The invention relates to the technical field of ductile iron casting, in particular to a nodularizing agent for thick and large section ductile iron parts and a preparation method thereof. Background technique [0002] Nodulizers are additives that make graphite in cast iron grow into nodular shapes during crystal growth. For thick and large section ductile iron castings with thick section, slow cooling rate and long solidification time, graphite distortion, graphite floating, coarse structure, chemical composition segregation and intergranular carbides are easy to occur at the wall thickness or hot joint of the casting. The nodulizer could not meet the production demand, so a new nodulizer was specially developed. Contents of the invention [0003] The purpose of the present invention is to provide a nodularizing agent for ductile iron parts with thick and large cross-section, which can promote the nucleation of graphite, reduce the tendency of whi...

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): C21C1/10C22C33/10
Inventor 柴知章许本琪席世亨张月茹
Owner ANHUI POLYTECHNIC UNIV MECHANICAL & ELECTRICAL COLLEGE
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com