Technology for producing spheroidal graphite cast iron

A production process and technology of ductile iron, which is applied in the field of production technology of -40 ℃ low temperature impact ductile iron, and achieves the effects of high performance strength, advanced technology and good low temperature impact performance

Inactive Publication Date: 2015-03-25
杨长国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the above-mentioned problems of large-section high-toughness low-temperature impact nodular cast iron, and provide a production process of -40°C low-temperature impact nodular cast iron with advanced design technology, high product strength, and good low-temperature impact performance

Method used

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  • Technology for producing spheroidal graphite cast iron

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Embodiment Construction

[0021] As shown in the figure, the process flow is:

[0022] (1) Selection of raw and auxiliary materials

[0023] In order to meet the requirements of low-temperature impact toughness, the furnace charge must be pure, and high-quality ductile iron pig iron should be selected. The impurities such as manganese, phosphorus, sulfur and titanium in the raw materials must be controlled at the lowest level, and the content of trace elements such as BP, BI, SB and TE It must be below 10PPM, and the content of impurity elements in scrap steel should be controlled at the lowest level.

[0024] (2) Electric Furnace Melting

[0025] Use a 12T medium frequency induction furnace to melt, heat the charge to 1500-1520°C, after testing, adjust the composition to 1450-1460°C, and control the pouring temperature at 1350±10°C

[0026] (3) Spheroidization treatment

[0027] The spheroidization treatment process adopts the flushing method spheroidization treatment process, and the spheroidizer ...

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Abstract

The invention discloses a technology for producing spheroidal graphite cast iron, which is characterized in that by optimizing a casting mold technology, a proper filtering cast system is employed, a reasonable chemical component is selected, spheroidising and inoculating treatment can be controlled, high-quality ductile iron pig iron is selected, and the qualified castings of the spheroidal graphite cast iron with -40 DEG C low-temperature impact can be produced by a graphite pretreatment technology and the filtering cast technology. The technology comprises the steps of selecting the raw auxiliary materials of pig iron, waste steel, an inoculants and a nodulizer, melting in an electric furnace, spheroidising, tapping and inoculating, performing stream inoculation, pretreating graphite, filtering and casting, casting test block, performing shot blast cleaning, processing test block, performing a low-temperature impact tensile test, and performing UT, MT and RT flaw detection. The technology is suitable for producing the spheroidal graphite cast iron with -40 DEG C low-temperature impact.

Description

technical field [0001] The invention relates to a production process of nodular cast iron, in particular to a production process of -40°C low-temperature impact nodular cast iron. Background technique [0002] Large-section high-toughness low-temperature impact ductile iron has been widely used in wind power generation and rail transit equipment, and the annual demand for low-temperature ductile iron castings is 800,000 tons. Castings generally adopt European standards (EN-GJS-400-18U-LT, ENGJS-350-22U-LT), and the quality requirements of castings are extremely strict. Castings have to go through UT, MT, RT non-destructive testing. Contents of the invention [0003] The object of the present invention is to solve the above-mentioned problems of large-section high-toughness low-temperature impact ductile iron, and provide a production process of -40°C low-temperature impact ductile iron with advanced design technology, high product strength, and good low-temperature impact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10B22D1/00B22C9/08
CPCY02P10/20
Inventor 杨长国
Owner 杨长国
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