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A kind of nodular cast iron and its processing technology

A technology of ductile cast iron and processing technology, which is applied in the field of metallurgy, can solve the problems of poor impact resistance and short product life, and achieve the effects of good impact resistance, good ductility, and low demand for rare earth elements

Active Publication Date: 2019-03-22
YUNNAN DESHENG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Castings such as coke quenching car floor and heat insulation parts in coking plants need to withstand high temperature and certain impact force. The existing products have short service life and poor impact resistance

Method used

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  • A kind of nodular cast iron and its processing technology
  • A kind of nodular cast iron and its processing technology
  • A kind of nodular cast iron and its processing technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of ductile iron, the chemical composition of the ductile iron includes: C=3.8%, Si=2.8%, Mn=0.3%, P=0.03%, S=0.01%, Mo=0.3%, Cu=0.4 %, Ni=0.6%, and the balance is iron.

[0031] The processing technology of described metal is:

[0032] 1) Mixing pig iron, scrap steel, waste ductile iron, ferromolybdenum, ferrosilicon and rare earth alloys to obtain a mixture, the weight ratio of the mixture is: 6.25: 1.6: 2: (0.013-0.015): (0.02-0.04): (0.015-0.02);

[0033] 2) Put the mixture into a 500Kg intermediate frequency electric furnace for smelting, and the molten iron obtained by smelting is transferred to the ladle after being melted and slag removed;

[0034] 3) Spheroidize the molten iron using the flushing method: add a nodulizer with a total mass of 1.5% of the molten iron mass on the side of the nodulizer ladle, add the nodulizer to the bottom of the molten iron ladle, and cover the nodulizer with 1.5-2.5 kg of ferrosilicon, then covered with iron filings, com...

Embodiment 2-6

[0060] Through the above-mentioned processing method of a kind of nodular cast iron, the embodiment 2-6 of different mass percentage of chemical composition is prepared, and the chemical composition of the nodular cast iron obtained by each embodiment and its properties are shown in the following table:

[0061] Chemical composition of table 2 embodiment 2-6 and corresponding test bar performance analysis

[0062]

[0063]

[0064] Most of the casting graphite is in the shape of agglomerates and spheres, and the rest are in the form of clusters and flocs. The spheroidization rate is 80-90%, reaching the third level or above of spheroidization; the number of pearlite in the matrix structure is ≥80%.

[0065] The ductile iron of the invention has high high temperature strength and good ductility. Therefore, it can be used in a temperature region above 800° C., and the demand for rare earth elements is low, which has the advantages of good economic benefits.

[0066] Among...

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PUM

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Abstract

Disclosed is nodular cast iron. The chemical components of the nodular cast iron include, by mass, 3.10-3.90% of C, 2.00-3.40% of Si, 0.2-0.9% of Mn, 0-0.07% of P, 0-0.03% of S, 0.1-0.30% of Mo, 0-0.40% of Cu, 0-0.60% of Ni, and the balance Fe. The invention provides a processing method capable of achieving good economical benefits. The nodular cast iron prepared through the processing method has the advantages of good impact resistance and high temperature resistance.

Description

technical field [0001] The patent of the invention relates to the field of metallurgy, in particular to a ductile cast iron and its processing technology. Background technique [0002] Spheroidal graphite cast iron is obtained through spheroidization and inoculation treatment, which effectively improves the mechanical properties of cast iron, especially the plasticity and toughness, so as to obtain higher strength than carbon steel. It is based on its excellent performance that it has been successfully It is mainly used to cast some parts with complex stress, high strength, toughness and wear resistance. Products produced by ductile iron casting technology have the advantages of high strength, high toughness and low price, and are widely used in various fields. Ductile iron has high-strength plasticity and toughness. It has developed very fast at home and abroad, and its output has surpassed cast steel and malleable cast iron, becoming a casting alloy material second only t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08C21D5/00
CPCC21D5/00C22C33/08C22C37/04C22C37/10
Inventor 李吉生何翔罗阳白峰白林何艳华
Owner YUNNAN DESHENG STEEL CO LTD