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

Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite

A technology of solid solution strengthening and nodular cast iron, which is applied in the field of nodular cast iron production, can solve the problems of large fluctuation range of casting hardness, difficult elongation to meet higher toughness requirements, and lower processing performance of castings, so as to reduce machining cost and hardness. Good uniformity and the effect of improving processability

Active Publication Date: 2017-07-07
德阳广大东汽新材料有限公司
View PDF6 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In conventional ductile iron castings, precious alloy elements such as Cu and Mo are often added to make the content of ferrite and pearlite in the matrix structure reach an appropriate ratio to control the strength and ductility of the material; but its elongation is often affected by pearlite. It is difficult to meet the requirements of higher toughness due to the influence of the quantity, and the hardness of the casting has a large fluctuation range due to the existence of the "bull's eye" structure in the metallographic structure, which reduces the processing performance of the casting

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
  • Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite
  • Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite
  • Melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A smelting process for producing QT450-18 ductile iron by adopting silicon solid-solution strengthened ferrite, comprising the following steps:

[0027] 1) Alternative raw materials are nodular iron pig iron, high-quality carbon steel scrap and recycled material for batching. The weight percentage content of each raw material is: nodular iron pig iron: 67%, carbon steel scrap: 8%, and recycled material: 25%;

[0028] 2) Optional auxiliary materials: yttrium-based heavy rare earth nodulizer, high-calcium barium inoculant, ferromanganese, antimony ingot;

[0029] 3) For smelting, first add nodular iron pig iron, then add recycled material, and finally add carbon scrap steel, and control the temperature of the melting process at 1330°C;

[0030] 4) Sampling and analysis after the charge is melted, adjust the composition according to the analysis results, the adjusted mass percentage of the chemical composition in the molten iron furnace is: C: 3.62% C, Si: 1.32%, Mn: 0.18%...

Embodiment 2

[0035] 1) Alternative raw materials are nodular iron pig iron, high-quality carbon steel scrap and recycled material for batching. The weight percentage content of each raw material is: nodular iron pig iron: 65%, carbon steel scrap: 15%, and recycled material: 20%;

[0036] 2) Optional auxiliary materials: yttrium-based heavy rare earth nodulizer, high-calcium barium inoculant, ferromanganese, antimony ingot;

[0037] 3) Carry out smelting, first add nodular iron pig iron, then add recycled materials, and finally add carbon scrap steel, and control the temperature of the melting process at 1350°C;

[0038] 4) Sampling and analysis after melting the charge, and adjusting the composition according to the analysis results. The adjusted mass percentages of the chemical composition in the molten iron furnace are: C: 3.58% C, Si: 1.61%, Mn: 0.21%;

[0039] 5) Carry out spheroidizing inoculation treatment; use the flushing method to carry out spheroidizing treatment, weigh the auxil...

Embodiment 3

[0043] 1) Alternative raw materials are nodular iron pig iron, high-quality carbon steel scrap and recycled material for batching. The weight percentage content of each raw material is: nodular iron pig iron: 65%, carbon steel scrap: 20%, and recycled material: 15%;

[0044] 2) Optional auxiliary materials: yttrium-based heavy rare earth nodulizer, high-calcium barium inoculant, ferromanganese, antimony ingot;

[0045] 3) Carry out smelting, first add nodular iron pig iron, then add recycled materials, and finally add carbon scrap steel, and control the temperature of the melting process at 1350°C;

[0046] 4) Sampling and analysis after the charge is melted, adjust the composition according to the analysis results, the adjusted mass percentage of the chemical composition in the molten iron furnace is: C: 3.76% C, Si: 1.85%, Mn: 0.29%;

[0047] 5) Carry out spheroidizing inoculation treatment; use the flushing method to carry out spheroidizing treatment, weigh the auxiliary ma...

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

No PUM Login to View More

Abstract

The invention discloses a melting technique for producing QT450-18 nodular cast iron through silicon solid solution reinforced ferrite. In the melting process, 60-70% of nodular iron pig iron by weight is added firstly, then 15-25% of scrap returns by weight are added, finally, 8-20% of carbon steel scrap by weight is added, and the temperature is 1320-1390 DEG C; a pouring process is adopted for nodularizing-inoculating treatment, specifically, auxiliary materials are added in a nodulizing ladle according to the weight percentage of the auxiliary materials accoundting for the total amount of nodulizing iron liquid, 1.20-1.40% of a yttrium-based heavy rare earth nodulizing agent is evenly laid on one side of the bottom, the nodulizing agent is evenly covered with 1.60-1.90% of a high-calcium-barium nucleating agent, and 0.003-0.006% of an antimony ingot is added before discharging; and according to the original iron liquid analysis result, 0-0.20% of ferromanganese is additionally added, and the temperature is 1450-1480 DEG C. A casting prepared through the melting technique is good in hardness uniformity and cutting performance, and the machining cost of the casting is reduced.

Description

technical field [0001] The invention relates to the technical field of nodular cast iron production, in particular to a smelting process for producing ferrite nodular cast iron QT450-18 by adopting silicon solid solution strengthening. Background technique [0002] In conventional ductile iron castings, precious alloy elements such as Cu and Mo are often added to make the content of ferrite and pearlite in the matrix structure reach an appropriate ratio to control the strength and ductility of the material; but its elongation is often affected by pearlite. It is difficult to meet the requirement of higher toughness due to the influence of the quantity, and because of the existence of the "bull's eye" structure in the metallographic structure, the hardness of the casting has a large fluctuation range, which reduces the processing performance of the casting. In order to improve the processing performance of castings while ensuring high strength and high toughness and plasticit...

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): C22C37/10C22C33/08C21C1/10C21C7/00
CPCC21C1/10C21C7/00C21D2211/005C21D2211/009C22C33/08C22C37/04C22C37/10Y02P10/20
Inventor 徐俊洪王鹏坤于越方铭王加斌张委刘建勇陈红军吴协正
Owner 德阳广大东汽新材料有限公司
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