A small-diameter ductile iron profile with a diameter of less than 25mm and its preparation method

A small-diameter, nodular iron technology, applied in the field of cast iron material casting, can solve the problems of low strength and shrinkage defects, etc., and achieve the effects of good cutting performance, compact structure and small cutting resistance

Active Publication Date: 2019-08-16
陕西西理华铸新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a small-diameter ductile iron profile with a diameter of less than 25mm, which solves the problems of shrinkage defects and low strength in the existing small-diameter ductile iron profiles with a diameter of less than Φ25mm.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Φ22mm ductile iron profile material and its preparation.

[0044] Its composition by weight percentage is: C: 3.6%, Si: 2.4%, Mn: 0.1%, P: 0.04%, S: 0.02%, and the rest is Fe.

[0045] The preparation method of the above-mentioned Φ22mm small-diameter nodular cast iron profile comprises the following steps:

[0046] (1) Hot metal smelting and composition adjustment

[0047] Use a 1.5-ton medium-frequency induction furnace to melt molten iron. The furnace materials are low-manganese cast ductile iron pig iron, scrap steel, recycled materials, 75% ferrosilicon and SiC, etc., and wait until all the materials in the furnace are completely melted; use the rapid analysis of the composition before the furnace to adjust the original molten iron. C: 3.6%, Si: 1.8%, Mn: 0.1%, P: 0.04%, S: 0.02%, the melting temperature is 1550°C, and the tapping temperature is 1520°C.

[0048] (2) Spheroidization

[0049] The spheroidization adopts a dam-type ladle, and the ratio of the height...

Embodiment 2

[0061] Φ20mm ductile iron profile material and its preparation.

[0062] Its composition by weight percentage is: C: 3.4%, Si: 2.8%, Mn: 0.2%, P: 0.06%, S: 0.04%, and the rest is Fe.

[0063] The preparation method of the above-mentioned Φ20mm small-diameter nodular cast iron profile comprises the following steps:

[0064] (1) Hot metal smelting and composition adjustment

[0065] Use a 1.5-ton medium-frequency induction furnace to melt molten iron. The furnace materials are low-manganese cast ductile iron pig iron, scrap steel, recycled materials, 75% ferrosilicon and SiC, etc., and wait until all the materials in the furnace are completely melted; use the rapid analysis of the composition before the furnace to adjust the original molten iron. C: 3.4%, Si: 2.0%, Mn: 0.2%, P: 0.06%, S: 0.04%, the melting temperature is 1565°C, and the tapping temperature is 1535°C.

[0066] (2) Spheroidization

[0067] The spheroidization adopts a dam-type ladle, and the ratio of the height...

Embodiment 3

[0079] Φ18mm ductile iron profile material and its preparation.

[0080] Its composition by weight percentage is: C: 3.8%, Si: 3.3%, Mn: 0.3%, P: 0.08%, S: 0.04%, and the rest is Fe.

[0081] The preparation method of the above-mentioned Φ18mm small-diameter nodular cast iron profile comprises the following steps:

[0082] (1) Hot metal smelting and composition adjustment

[0083] Use a 1.5-ton medium-frequency induction furnace to melt molten iron. The furnace materials are low-manganese cast ductile iron pig iron, scrap steel, recycled materials, 75% ferrosilicon and SiC, etc., and wait until all the materials in the furnace are completely melted; use the rapid analysis of the composition before the furnace to adjust the original molten iron. C: 3.8%, Si: 2.4%, Mn: 0.3%, P: 0.08%, S: 0.04%, the melting temperature is 1580°C, and the tapping temperature is 1550°C.

[0084] (2) Spheroidization

[0085] The spheroidization adopts a dam-type ladle, and the ratio of the height...

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Abstract

The invention discloses a ductile iron bar with a small diameter smaller than 25 mm. The ductile iron bar with the small diameter smaller than 25 mm comprises, by weight, 3.4%-3.8% of C, 2.4%-3.3% of Si, no more than 0.4% of Mn, no more than 0.10% of P, no more than 0.06% of S, and the balance Fe, and the sum of the weight percents of all the components is 100%. The invention further discloses a preparation method of the ductile iron bar. The ductile iron bar with the small diameter smaller than 25 mm is compact in structure, free of shrinkage defects such as shrinkage cavities and porosity, moderate in hardness (radial carbides are avoided, and the content of free carbides is smaller than 10%), smooth in surface, and high in strength. The strength index of a body sample meets the LZQT500-7 requirement, the cutting machinability is good, the cutting resistance is small, high-speed finish machining can be achieved, and relative fluctuation of the smoothness of a machined surface is small.

Description

technical field [0001] The invention belongs to the technical field of cast iron material casting, and relates to a small-diameter ductile iron profile with a diameter of less than 25 mm, and also relates to a preparation method of the ductile iron profile. Background technique [0002] Cast iron horizontal continuous casting is a new technology for the green production of modern high-quality cast iron materials. Since 1986, Professor Wang Yiqing and Professor Gan Yu of Xi'an University of Technology, Professor Wu Dehai of Tsinghua University, and Professor Lu Wenhua of Xi'an Jiaotong University jointly started to study cast iron horizontal continuous casting technology. Cast iron horizontal continuous casting technology has been developed in my country for nearly 30 years. Cast iron horizontal continuous casting technology has been greatly developed in our country. At present, my country's cast iron profile products are mainly round sections of Φ30-250mm and a few rectangul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08B22D1/00B22D11/045
CPCB22D1/00B22D11/045C22C33/08C22C37/04C22C37/10
Inventor 徐春杰李翠芹武迈马萌徐信锋赵振马东李倩淡江雷张忠明
Owner 陕西西理华铸新材料科技有限公司
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