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White-core malleable cast iron decarburization process

A cast iron and decarburization technology, applied in the field of cast iron decarburization technology, can solve the problem of high scrap rate of cast iron, achieve the effects of improving quality, avoiding extremely high hardness of sintered material, and reducing scrap and waste

Inactive Publication Date: 2021-12-24
TANGSHAN XINYE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a white-heart malleable cast iron decarburization process, which solves the problem that the cast iron scrap rate is higher than 5% in the related art

Method used

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  • White-core malleable cast iron decarburization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A white heart malleable iron decarburization process, comprising the following steps

[0063] S1. Prepare raw materials

[0064]Castings, its components include by weight: 13.8 parts of steel scrap, 0.4 parts of recarburizer and 21 parts of returned materials; Iron oxide scale 2-2.5 parts;

[0065] S2. Raw materials enter the furnace

[0066] Put the casting into the heat treatment furnace, add a decarburizer to mix the materials; seal the heat treatment furnace after the materials are mixed;

[0067] S3. Heat treatment

[0068] Heating process: heat up the mixed materials in the heat treatment furnace in sequence, the heating time is 20h, the temperature after heating is 1050°C, and the heating rate is 50°C / h;

[0069] Heat preservation process: maintain the temperature after heating for 70h;

[0070] Cooling process: (1) The first stage of cooling: the temperature is lowered to 780 degrees Celsius at a cooling rate of 30°C / h, that is, the cooling time is 9h; (2) ...

Embodiment 2

[0087] The exothermic decarburizer is added to each part of the casting, including 1.3 parts by weight of iron oxide scale and 1.3 parts of iron ore; the rest are the same as in Example 1.

[0088] The decarburized castings are tested, and the carbon content in the interval 0-1mm from the outer surface is 0.07%, and the carbon content in the interval 2-2.5mm is 0.56%;

Embodiment 3

[0090] A white heart malleable iron decarburization process, comprising the following steps

[0091] S1. Prepare raw materials

[0092] Castings include: 13.8 parts of steel scrap, 0.4 parts of recarburizer and 21 parts of returned materials in parts by weight;

[0093] S2. Raw materials enter the furnace

[0094] Put the casting into the heat treatment furnace, add a decarburizer to mix the materials; seal the heat treatment furnace after the materials are mixed; add exothermic decarburizer to each part of the casting, including 0.5 parts by weight of iron oxide scale, iron ore 0.75 copies;

[0095] S3. Heat treatment

[0096] Heating process: heat up the mixed materials in the heat treatment furnace sequentially, the heating time is 5h, the temperature after heating is 1050°C, and the heating rate is 210°C / h;

[0097] (1) The first stage of heat preservation: maintain a high temperature of 1050 ° C for 80 hours;

[0098] (2) The second stage of heat preservation: suddenly...

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Abstract

The invention relates to the technical field of cast iron decarburization, and provides a white-core malleable cast iron decarburization process which comprises the following steps of S1, preparing raw materials, a casting and a decarburizing agent; S2, feeding the raw materials into a furnace, putting the casting into a heat treatment furnace, adding the decarburizing agent for material mixing; and sealing the heat treatment furnace after the materials are mixed, wherein the decarburizing agent is one or more of oxide scale, iron ore, building sand and limestone; S3, conducting heat treatment: in the heating process, heating the mixed materials in the heat treatment furnace in sequence for 5 to 24 hours, and controlling the temperature after heating to be 1000 DEG C to 1100 DEG C; in the heat preservation process, maintaining the heated temperature for 20 to 80 h; in the cooling process, reducing the temperature to 650 DEG C or below; and S4, discharging the product from the furnace, and opening a furnace door of the heat treatment furnace. Through the technical scheme, the problem that the scrap rate of cast iron is higher than 5 percent in the prior art is solved.

Description

technical field [0001] The invention relates to the technical field of cast iron decarburization process, in particular to a white-heart malleable cast iron decarburization process. Background technique [0002] White heart malleable cast iron is a kind of malleable cast iron with a silvery white cross section, a thicker decarburized layer on the outer edge, and uneven inner and outer structures. The outer layer is full ferrite, and the center has pearlite and a small amount of flocculent graphite. There is even residual free cementite; it has good mechanical properties and weldability; the existing production of white heart malleable cast iron is obtained by heat treatment of white cast iron blanks in a sealed annealing furnace, while the existing production The scrap rate of cast iron in the decarburization process of white-heart malleable cast iron is greater than 5%, and the production cost is very high. Contents of the invention [0003] The invention proposes a whit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D3/04
CPCC21D3/04
Inventor 杨德军李德芳李艳君
Owner TANGSHAN XINYE TECH
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