Unlock instant, AI-driven research and patent intelligence for your innovation.

Casting technology of high-strength and high-toughness nodular cast iron

A technology of nodular cast iron and casting technology, which is applied in the field of metal casting, can solve the problems of low utilization rate of nodularizing agent, low technical content, environmental pollution, etc., achieve superior mechanical properties, increase the number of eutectic clusters, and improve the nodularization rate Effect

Active Publication Date: 2017-09-22
安徽巨泰机械制造有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of industry, people have higher and higher requirements on the performance of ductile iron, and more and more attention is paid to the energy consumption in the casting process and the environmental problems caused by it. However, in the traditional production process of ductile iron, there is energy consumption. For a long time, technical personnel at home and abroad have made unremitting efforts to study the casting method of ductile iron
[0004] At present, in the production process of domestic nodular cast iron, most of the spheroidizing agents are added by the flushing method. This method has low technical content and has greater flexibility in the production process. However, the magnesium light and smoke pollution in the spheroidizing process are more Serious, and the utilization rate of nodulizer is low

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
  • Casting technology of high-strength and high-toughness nodular cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A casting process of high-strength and high-toughness ductile iron includes the following steps:

[0028] (1) After heating and melting the scrap steel, ferrosilicon, pig iron and recarburizer into molten iron, continue to heat up to 1500℃, remove the slag, and then add the metal block, adjust the chemical composition and content in the molten iron, and the metal block to be added After all is melted, keep it warm for 3min and out of the oven;

[0029] (2) Control the tapping temperature at 1540℃, tapping time is 3min, add the rare earth compound inoculant in flow mode, the quality of the inoculant is 0.5% of the mass of the molten iron, the particle size is 18mm, the molten iron is all added to the height-to-diameter ratio After the molten iron ladle is 1.6, close the lid of the molten iron ladle and start the wire feeding operation. The wire feed components used are: Mg 20%, Si 45%, Re 2%, Ca 1.5%, and the rest is iron. The diameter of the wire is 15mm, the outer layer of...

Embodiment 2

[0032] A casting process of high-strength and high-toughness ductile iron includes the following steps:

[0033] (1) After mixing the scrap steel, ferrosilicon, pig iron and recarburizer to melt into molten iron, continue to heat up to 1480℃, remove the slag, and then add the metal block, adjust the chemical composition and content in the molten iron, and the metal block to be added After all melted, keep it warm for 2min and then out of the furnace;

[0034] (2) Control the tapping temperature at 1550℃, tapping time is 5min, add the rare earth compound inoculant in flow mode, the mass of the inoculant is 0.3% of the mass of the molten iron, the particle size is 15mm, the molten iron is all added to the height-to-diameter ratio After the 1.6-sized molten iron ladle is placed, close the lid of the molten iron ladle and start the wire feeding operation. The wire feed components used are: Mg 15%, Si 40%, Re2.5%, Ca 1.5%, and the rest is iron. The diameter of the feeding wire is 10mm,...

Embodiment 3

[0037] A casting process of high-strength and high-toughness ductile iron includes the following steps:

[0038] (1) After the scrap steel, ferrosilicon, pig iron and recarburizer are mixed and heated to melt into molten iron, the temperature is continued to rise to 1520°C, slag is removed, and metal blocks and alloys are added to adjust the chemical composition and content of the molten iron. After the metal lump is completely melted, keep it warm for 1 min and then take it out;

[0039] (2) Control the discharge temperature at 1560℃, the discharge time is 5min, add the rare earth composite inoculant in a flow mode, the quality of the inoculant is 0.6% of the mass of the molten iron, the particle size is 20mm, the molten iron is all added to the height-to-diameter ratio After the 1.6 is in the molten iron ladle, close the lid of the molten iron ladle and start the wire feeding operation. The wire feed components used are: Mg 25%, Si 55%, Re2.5%, Ca 2.5%, and the rest is iron. The...

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 provides a casting technology of high-strength and high-toughness nodular cast iron and relates to the field of metal casting. The casting technology comprises the following steps that after scrap steel, silicon iron, pig iron and carburant are mixed, heated and molten into molten iron, chemical components in the molten iron and content are adjusted, heat is preserved, the molten iron is discharged out of a furnace, a nucleating agent is added into the molten iron in a follow-flow manner, the molten iron is added into a molten iron ladle totally, then wire feeding operation is carried out, adopted wire feeding components comprise 15%-25% of Mg, 40%-60% of Si, 1.5%-2.5% of Re, 1.5%-2.5% of Ca and the balance iron, after the wire feeding operation is finished, secondary inoculation and casting are carried out, and the high-strength and high-toughness nodular cast iron can be obtained. The casting technology has the beneficial effects of being low in production cost, safe and environmentally friendly. Moreover, the produced nodular cast iron has high strength and toughness, and all mechanical properties are excellent.

Description

Technical field [0001] The invention relates to the field of metal casting, in particular to a casting process of high-strength and high-toughness ductile iron. Background technique [0002] Nodular cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some complex forces, strength, toughness, and wear resistance. For parts with high performance requirements, nodular cast iron has rapidly developed into a cast iron material second only to gray cast iron and widely used. [0003] Nodular graphite cast iron is obtained by spheroidizing and inoculation treatment to improve the mechanical properties of cast iron, especially the plasticity and toughness are effectively improved, thereby obtaining nodular cast iron with higher strength than carbon steel. With the development of industry, people’s requirements for the performance of ductile ...

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
CPCC21C1/105C22C33/10C22C37/04
Inventor 卫正所
Owner 安徽巨泰机械制造有限公司