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Production technology for as-cast spheroidal graphite iron casting QT600-7

A nodular cast iron, production process technology, applied in the field of casting, can solve the problems of material performance degradation, loose structure, unstable production, etc., and achieve the effect of reducing production costs and stabilizing production

Active Publication Date: 2014-05-28
SHANDONG QIU CHEN MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to provide a production process of as-cast QT600-7 ductile iron castings, to solve the problem that the ductile iron castings produced by the existing process not only have high cost, but also the loose structure causes the material performance to decline, resulting in poor production. stable technical issues

Method used

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  • Production technology for as-cast spheroidal graphite iron casting QT600-7
  • Production technology for as-cast spheroidal graphite iron casting QT600-7

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Smelting: Select Q10 pig iron with a weight percentage content of 20%, Q235 steel scrap with a weight percentage content of 10% and recycled material with a weight percentage content of 70%, and put them into an intermediate frequency induction furnace to melt into molten iron;

[0028] (2) Spheroidization: 0.3% by weight of Cu, 0.1% by weight of Ni, 0.8% by weight of RE-Mg spheroidizer and 0.5% by weight of 10mm particle size The SiBaCa inoculant is placed at the bottom of a 1T ladle. Preferably, the weight percentages of RE and Mg in the RE-Mg nodulizer are RE3 and Mg8 respectively. The molten iron after smelting is heated up to 1500°C, and then poured into Spheroidizing in the ladle;

[0029] (3) Flowing inoculation: when the spheroidized molten iron is subcontracted, a powdered SiBaCa inoculant with a weight percentage content of 0.2% is added with the flow;

[0030] (4) Pouring: pour the molten iron into the mold after inoculation with the flow, set the chill ...

Embodiment 2

[0032] (1) Smelting: select Q10 pig iron with a weight percentage content of 50%, Q235 steel scrap with a weight percentage content of 30% and returned materials with a weight percentage content of 20%, and put them into an intermediate frequency induction furnace to melt into molten iron;

[0033] (2) Spheroidization: 1.2% by weight of Cu, 0.6% by weight of Ni, 1.5% by weight of RE-Mg spheroidizer and 1.5% by weight of 10mm particle size The SiBaCa inoculant is placed at the bottom of a 1T ladle. Preferably, the weight percentages of RE and Mg in the RE-Mg nodulizer are RE3 and Mg8 respectively. The molten iron after smelting is heated up to 1600°C, and then poured into Spheroidizing in the ladle;

[0034] (3) Flowing inoculation: when the spheroidized molten iron is subcontracted, a powdered SiBaCa inoculant with a weight percentage content of 0.4% is added with the flow;

[0035] (4) Pouring: pour the molten iron into the mold after inoculation with the flow, set the chill...

Embodiment 3

[0037] (1) Smelting: select Q10 pig iron with a weight percentage content of 30%, Q235 steel scrap with a weight percentage content of 20% and recycled materials with a weight percentage content of 50%, and put them into an intermediate frequency induction furnace to melt into molten iron;

[0038](2) Spheroidization: 0.7% by weight of Cu, 0.4% by weight of Ni, 1.1% by weight of RE-Mg spheroidizer and 1% by weight of 10mm particle size The SiBaCa inoculant is placed at the bottom of a 1T ladle. Preferably, the weight percentages of RE and Mg in the RE-Mg nodulizer are RE3 and Mg8 respectively. The molten iron after smelting is heated up to 1560°C, and then poured into Spheroidizing in the ladle;

[0039] (3) Flow inoculation: when the spheroidized molten iron is subcontracted, a powdered SiBaCa inoculant with a weight percentage content of 0.3% is added with the flow;

[0040] (4) Pouring: pour the molten iron into the mold after inoculation with the flow, set the chill iron ...

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Abstract

The invention discloses a production technology for an as-cast spheroidal graphite iron casting QT600-7 and belongs to the technical field of casting. The production technology comprises the steps of feeding Q10 raw iron, Q235 waste steel and a foundry returns into a furnace for smelting to obtain liquid iron; putting Cu, Ni and an RE-Mg balling agent as well as a SiBaCa nucleating agent at the bottom of a foundry ladle, and pouring the smelted liquid iron into the foundry ladle for balling; adding the powdered SiBaCa nucleating agent along with the flow during ladle transferring of the balled liquid iron; pouring the nucleated liquid iron into a casting mold to obtain the as-cast spheroidal graphite iron casting QT600-7. The material intensity of the spheroidal graphite iron casting produced by the production technology is higher than or equal to 600Mpa, and the elongation rate is greater than or equal to 7 percent. The as-cast spheroidal graphite iron casting QT600-7 has comprehensive performance of high elongation rate of ferrite spheroidal graphite iron and high intensity of pearlyte spheroidal graphite iron; the pearlyte content is 35-60 percent, the balling rate is about 85 percent, and stable production that the as-cast spheroidal graphite iron casting 600-7 has standard performance is realized.

Description

technical field [0001] The invention belongs to the technical field of casting, and in particular relates to a production process of as-cast QT600-7 ductile iron castings. Background technique [0002] Ductile cast iron is obtained by adding a certain amount of nodularizing agent to molten iron for spheroidizing treatment during pouring. The nodularizing agent can make graphite appear as spherical crystals. In order to prevent white spots after molten iron spheroidization treatment, inoculation treatment must be carried out to increase the number of graphite spheres, reduce the diameter of the graphite spheres, round the shape, and evenly distribute, significantly improving its mechanical properties. Compared with other cast irons, nodular cast iron has high strength, plasticity, toughness, and high yield strength, but its shrinkage rate is relatively large during solidification, and castings are prone to defects such as loose structure and shrinkage cavity. [0003] Castin...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C33/08B22D27/04
Inventor 马方茂马世义马仁殿吕洪涛
Owner SHANDONG QIU CHEN MACHINERY MFG
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