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

Low-cost preparation method for high-elongation ductile iron castings

A high-elongation, ductile iron technology, applied in the direction of improving process efficiency, can solve the problems of mechanical properties decline of ductile iron castings, quality of molten iron, increase of free carbon, etc., to reduce costs, reduce raw material costs, and improve economic benefits. Effect

Inactive Publication Date: 2011-04-20
齐齐哈尔市精铸良铸造有限责任公司
View PDF3 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the high cost of the existing method for preparing ductile iron castings, and with the increase of the amount of scrap steel, the amount of recarburizer used increases, so that the free carbon in the molten iron increases and the quality of the molten iron decreases, resulting in the obtained nodular cast iron In order to solve the problem of the decline in the mechanical properties of the parts, the present invention provides a low-cost method for preparing ductile iron castings with high elongation

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
  • Low-cost preparation method for high-elongation ductile iron castings

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0010] Specific embodiment 1: The method for preparing high elongation ductile iron castings at low cost in this embodiment is realized by the following steps: 1. Adding pig iron as the bottom material in the smelting furnace, and then adding recarburizer, remaining pig iron, Scrap steel, recycle material, manganese alloy and silicon alloy are then heated to 1520~1550℃ to melt the contents of the smelting furnace into molten iron, then calm and slag off, and then control the temperature of molten iron to be out of the furnace at 1490~1510℃. The mass ratio of the recycled material is 5:2, the mass ratio of the total mass of pig iron to the recycled material is 3:2, the mass of the recarburizer is 3% to 4% of the mass of the scrap steel, and the manganese content in the molten iron is controlled to the total mass of the molten iron. 0.2% to 0.4% of the molten iron, and the content of silicon in the molten iron is 2.5% to 2.9% of the total mass of the molten iron; 2. Add spheroidiz...

specific Embodiment approach 2

[0013] Specific embodiment two: This embodiment is different from the specific embodiment one in that it is heated to 1530-1540°C in step one. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment three: this embodiment is different from specific embodiment one in that it is heated to 1535°C in step one. Other steps and parameters are the same as in the first embodiment.

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
elongationaaaaaaaaaa
Login to View More

Abstract

The invention provides a low-cost preparation method for high-elongation ductile iron castings, which relates to a method for preparing ductile iron castings. The invention solves the problem that the conventional method for preparing ductile iron castings is high in cost, increases carburant consumption with the increase in scrap consumption, causes the increase of free carbon in hot metal, and leads to decrease in mechanical properties of obtained ductile iron castings. The method comprises: 1, adding raw materials to a melting furnace, melt the raw materials into hot metal and then discharging the hot metal out of the furnace; 2, performing purification while performing spheroidization inoculation on the hot metal; and 3, performing pouring to obtain the ductile iron castings. The preparation method can reduce 20 percent of cost for producing one ton of ductile cast iron, and the obtained ductile iron castings have the tensile strength up to 460 MPa, the yield strength up to 350 MPa, the elongation up to 16.5 percent and the mechanical properties meeting requirements for QT450-15 ductile cast iron.

Description

Technical field [0001] The invention relates to a method for preparing ductile iron castings. Background technique [0002] Existing nodular cast iron production generally uses pig iron and scrap steel as raw materials, of which the amount of pig iron accounts for 60-80% of the total feed volume. Due to the general increase in the price of pig iron, the cost of nodular cast iron continues to rise. At the same time, with the development of society and economy, A large number of steel products have been upgraded and produced a large amount of recyclable steel scrap, and the price of scrap steel per ton is about 1,000 yuan lower than the price of pig iron. [0003] Therefore, adding more scrap steel to the ratio can reduce the cost of raw materials. However, as the amount of scrap raw materials added increases, the amount of recarburizer added increases. However, the addition of recarburizer increases the free carbon in the molten iron and deteriorates Improve the quality of molten i...

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 Patents(China)
IPC IPC(8): B22D1/00C21C1/10C22C33/08
CPCY02P10/20
Inventor 王德军鲍玉龙
Owner 齐齐哈尔市精铸良铸造有限责任公司
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