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Nodular cast iron and preparation method thereof

A technology of ductile iron and molten iron, applied in the field of ductile iron and its preparation, can solve problems such as poor spheroidization, shrinkage cavity shrinkage, subcutaneous pores, etc., and achieve the effect of improving the pass rate and overcoming poor spheroidization

Inactive Publication Date: 2016-03-16
WUHU RONGCHUAN ELECTROMECHANICAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, poor spheroidization, spheroidization decline, shrinkage cavity shrinkage, subcutaneous pores, slag inclusions, graphite floating, anti-whitening, and gray spots are common defects of nodular cast iron during the preparation.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] This kind of nodular cast iron contains the following chemical elements by weight: Si: 6.3%, C: 2.2%, Mn0.21%, Mo: 0.69%, P: 0.42%, S: 0.015%, Cr: 0.15%, and the rest are virgin Iron and scrap steel.

[0013] The preparation method of this kind of ductile cast iron includes the following steps:

[0014] (1) Open the furnace: add primary iron and scrap steel, heat up and melt, and the electric furnace temperature is controlled at 1550℃;

[0015] (2) Addition of auxiliary materials: adding spheroidizing agent, then evenly covering 70% of the inoculant on the spheroidizing agent, plus a small amount of perlite, flushing into 70% of the total weight of molten iron, for spheroidizing and Inoculation treatment, the spheroidization time is 4 minutes, and the inoculation temperature is 1530℃; after the spheroidization process is completed, the remaining 30% inoculant and the remaining 30% molten iron are flushed into the spheroidization bag, and the process is 4 minutes, and it will ...

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PUM

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Abstract

The invention discloses a nodular cast iron and a preparation method thereof. The nodular cast iron contains the following chemical elements in percentage by weight: 6.0-6.8% of Si, 2-2.8% of C, 0.20-0.25% of Mn, 0.65-0.70% of Mo, 0.41-0.45% of P, 0.01-0.02% of S, 0.10-0.35% of Cr, and the balance of pig iron and scrap steel; the preparation method of the nodular cast iron comprises furnace startup, auxiliary material addition, nodularization treatment and inoculation treatment, and casting after a qualified melt is obtained; compared with the prior art, the preparation method of the nodular cast iron has the advantages of avoiding phenomena of poor nodularization, nodularized degradation, shrinkage cavity and porosity, subskin blowhole, slag inclusion, graphite floating, inverse chill, gray spots and the like, and improving the yield.

Description

Technical field [0001] The invention relates to the technical field of alloy smelting and precision casting, in particular to a ductile iron and a preparation method thereof. Background technique [0002] Nodular cast iron is obtained by spheroidization and inoculation treatment to obtain spheroidal graphite, which effectively improves the mechanical properties of cast iron, especially plasticity and toughness, thereby obtaining higher strength than carbon steel. Nodular cast iron is a high-strength cast iron material developed in the 1950s. Its comprehensive performance is close to that of steel. Based on its excellent performance, it has been successfully used to cast some complex forces, strength, toughness, and wear resistance. Highly demanding parts. Nodular cast iron has rapidly developed into a cast iron material second only to gray cast iron and widely used. However, poor spheroidization, spheroidization recession, shrinkage cavities and porosity, subcutaneous pores, sl...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C37/10C22C33/08C21C1/10
Inventor 吴景泉殷涛艾家贵
Owner WUHU RONGCHUAN ELECTROMECHANICAL TECH