As-cast high pearlite quantity and high vermicular rate vermicular graphite cast iron and preparation method thereof

A technology of vermicular graphite cast iron and pearlite, which is applied in the field of preparation of vermicular graphite cast iron with high pearlite content and high creep rate in the as-cast state, can solve the problems of insufficient deformation resistance, damage and failure, etc., and achieve easy, stable and accurate control and preparation process The process is simple and the effect of increasing the number of nucleation

Active Publication Date: 2018-10-09
西安洪盛冶金科技有限公司
View PDF12 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of this invention is to provide a kind of preparation method of as-cast vermicular graphite cast iron with high pearlite content and high creep rate, so as to overcome the problems such as brake drums of existing heavy-duty trucks, high-load internal combustion engine cylinder blocks and cylinder liners. The problem of damage and failure due to insufficient heat resistance, thermal fatigue resistance, wear resistance, and deformation resistance during service

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
  • As-cast high pearlite quantity and high vermicular rate vermicular graphite cast iron and preparation method thereof
  • As-cast high pearlite quantity and high vermicular rate vermicular graphite cast iron and preparation method thereof
  • As-cast high pearlite quantity and high vermicular rate vermicular graphite cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Its chemical composition is by weight percentage: C3.6%, Si2.3%, Mn0.8%, Cu0.3%, Mo0.3%, Sn0.08%, Cr0.3%, Ni0.4%, Nb0.1 %, the balance is composed of iron and unavoidable impurities. Add 45# scrap steel and Q10 pig iron weighed according to the proportion in the 300Kg intermediate frequency induction melting furnace. After heating until it is completely melted, add the required pure copper, ferromanganese, ferromolybdenum, ferrochromium, high-purity electrolytic nickel and pure niobium in sequence, and finally use FeSi75 to supplement Si, and check the C3.58% and S0.03% of the molten iron , P0.034%, after meeting the requirements, heat the molten iron in the furnace to 1480°C and release it from the furnace.

[0026] Vermative inoculation treatment: heat the molten iron in the furnace to 1480°C and perform a vermicular inoculation treatment; put the vermicular agent into the bottom of the embankment, cover it with the inoculation refiner, and evenly sprinkle Sn particl...

Embodiment 2

[0029] Its chemical composition is by weight percentage: C3.8%, Si2.0%, Mn1.0%, Cu0.4%, Mo0.2%, Sn0.1%, Cr0.25%, Ni0.4%, Nb0.05 %, the balance is composed of iron and unavoidable impurities. Add 45# scrap steel and Q10 pig iron weighed according to the proportion in the 300Kg intermediate frequency induction melting furnace. After heating until it is completely melted, add the required pure copper, ferromanganese, ferromolybdenum, ferrochrome, high-purity electrolytic nickel and pure niobium in sequence, and finally use FeSi75 to supplement Si to check the C3.73% and S0.035 of the molten iron. %, P0.038%, after meeting the requirements, raise the temperature of the molten iron in the furnace to 1460°C and release it from the furnace.

[0030] Vermative inoculation treatment: After the molten iron in the furnace is heated to 1460°C, the molten iron is tapped for a vermicular inoculation treatment; the vermicular agent is put into the bottom of the embankment, and the inoculati...

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
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
tensile strengthaaaaaaaaaa
Login to view more

Abstract

The invention discloses as-cast high pearlite quantity and high vermicular rate vermicular graphite cast iron and a preparation method thereof. The vermicular graphite cast iron is prepared from the following components by weight percent: 3.5-3.8% of C, 2.2-2.4% of Si, 0.8-1% of Mn, 0.2-0.4% of Cu, 0-0.4% of Mo, 0.08-0.1% of Sn, 0.2-0.4% of Cr, 0.2-0.5% of Ni, 0.05-0.1% of Nb, less than or equal to 0.06% of S, less than or equal to 0 .06% of P, and the balance of Fe and impurities introduced by raw materials. The vermicular graphite cast iron with a high creep rate (90-98%) is obtained by using an Mg-RE creeping method for controlling; furthermore, by means of micro-regulation of multiple alloy elements, the vermicular graphite cast iron with a high high pearlite quantity (90%-100%) can bestably obtained; the tensile strength of the vermicular graphite cast iron is greater than or equal to 500MPa, the elongation of the vermicular graphite cast iron is greater than or equal to 1.5%, Brinell hardness of the vermicular graphite cast iron is 230-260HBW, and the microhardness of pearlite is 300-320HV. The vermicular graphite cast iron provided by the invention has the characteristics of being good in mechanical properties, thermal fatigue resistance, thermal crack resistance and wear resistance under the extremely harsh working conditions; the preparation method is simple in control method and can stably produce castings with excellent comprehensive performance, thus being suitable for industrial mass production.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a preparation method of vermicular graphite cast iron with high pearlite content and high creep rate in the as-cast state. Background technique [0002] Brake drums of heavy-duty trucks, high-load internal combustion engine cylinder blocks and cylinder liners and other components are subjected to strong friction, high thermal loads, and huge temperature gradients during service, and their service conditions are extremely harsh. The strength of materials for such components , Wear resistance, heat resistance and thermal fatigue resistance put forward higher requirements. At present, a material with excellent comprehensive performance - compacted graphite cast iron has been widely researched and applied, especially the compacted graphite cast iron with high pearlite content and high creep rate, which has good casting performance, compactness and better casting performance. Mechanical ...

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
Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/08C22C33/10C21C1/08C21C7/00
CPCC21C1/08C21C7/0006C22C33/10C22C37/08C22C37/10Y02P10/20
Inventor 陶栋杨忠李建平郭永春杨通马志军
Owner 西安洪盛冶金科技有限公司
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