Melting technology for thin-wall ferrite nodular iron casting

A ferrite and cast iron technology, which is applied to the smelting process of thin-walled ferritic ductile iron castings, can solve problems such as affecting the toughness of thin-walled ductile iron castings, and achieve the effect of ensuring the inoculation effect.

Inactive Publication Date: 2017-09-19
江苏力源金河铸造有限公司
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  • Abstract
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Problems solved by technology

[0004] Due to the fast cooling rate of thin-walled ductile iron castings after pouring, pearlite is easily produced in its metallographic structure, which affects the toughness of thin-walled ductile iron castings

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  • Melting technology for thin-wall ferrite nodular iron casting
  • Melting technology for thin-wall ferrite nodular iron casting
  • Melting technology for thin-wall ferrite nodular iron casting

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Embodiment Construction

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0036] In a specific embodiment of the present invention, a smelting process of a thin-walled ferrite ductile iron casting is disclosed, and the process is as follows:

[0037] (1) Feeding smelting, first add 30±2% of low-manganese scrap steel and recarburizer into the intermediate frequency induction furnace at the same time, then add 30±2% of the returned charge, and finally add 40±2% of Q10 pig iron, and the molten iron in the furnace Add 75% ferrosilicon into the electric furnace when the smelting reaches 2 / 3;

[0038] (2) Fine-tuni...

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Abstract

The invention relates to the technical field of iron casting melting, in particular to a melting technology for a thin-wall ferrite nodular iron casting. The melting technological process comprises the following steps of feeding melting, ingredient fine adjustment, molten iron pretreatment, molten iron refining, spheroidizing treatment and inoculation treatment. According to the technology, the feeding sequence is controlled, so that it is ensured that crystal type cores in cast iron are not be severely damaged by fire, and sufficient crystal type cores are provided for spheroidizing of graphite in molten iron in the later period; the method of adding SiC at the same time is adopted in the pretreatment process, the molten iron is made to sufficiently absorb SiC through electromagnetic stirring force of electric furnace melting, and the pretreatment effect is ensured; the thrice inoculation treatment technology is adopted in the inoculation treatment process, and therefore the inoculation effect on the molten iron is sufficiently ensured; and casting is finished within a short time after molten iron spheroidizing treatment, and the metallographic structure of the casting is ensured.

Description

technical field [0001] The invention belongs to the technical field of cast iron smelting, in particular to a smelting process for thin-walled ferrite ductile iron castings. Background technique [0002] The matrix is ​​ferrite ductile iron (referred to as nodular iron), which has certain strength, good impact toughness and plasticity, and can be obtained by casting or annealing. [0003] Metallographic structure The morphology of graphite and the metal matrix structure have a great influence on its toughness. The influence of graphite shape, under the condition that the metal matrix structure is qualified, the graphite shape has a great influence on the elongation and impact value: the flake graphite severely splits the metal matrix, and the stress concentration at the sharp corner, so the flake graphite cast iron is brittle, The impact value is very low, and the strength is greatly weakened; while ductile iron is different, as long as the matrix structure is qualified, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21C1/10C22C33/10C22C37/04C22C37/10
CPCC21C1/10C21C1/105C21D2211/005C22C33/10C22C37/04C22C37/10Y02P10/20
Inventor 章桂林范颖
Owner 江苏力源金河铸造有限公司
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