Melting process method for eliminating reverse chill phenomenon of nodular cast iron

A technology of nodular cast iron and process method, applied in the field of casting casting, can solve problems such as poor inoculation effect, spheroidization inoculation decline, inoculation decline, etc., achieve high-efficiency inoculation results, ease the severity, and improve the product qualification rate

Inactive Publication Date: 2020-09-04
江苏力源金河铸造有限公司
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Problems solved by technology

[0005] 2. Spheroidizing inoculation recession: Inoculation recession occurs in the final solidification part of ductile iron castings, or the inoculation effect is not good, and the number of graphite balls is small to form anti-whitening

Method used

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Embodiment

[0031] A smelting process method for eliminating the anti-white phenomenon of ductile iron, the raw materials are selected as follows:

[0032] Pig iron, chemical composition (by mass percentage): C-4.45%, Si-0.85%, Mn-0.016%, P-0.023%, S-0.006%, Cr-0.033%, Ti-0.010%, V-0.040%, The balance is Fe;

[0033] Steel scrap, chemical composition (by mass percentage): C-0.018%, Si-0.08%, Mn-0.09%, P-0.02%, S-0.014%, Cr-0.05%, Ti-0.036%, V-0.038%, The balance is Fe;

[0034] Carburizer, chemical composition (by mass percentage): low-nitrogen carburizer nitrogen ≤ 0.02%, carbon ≥ 98%, S ≤ 0.03%, particle size 1-5MM;

[0035] Silicon carbide, chemical composition (by mass percentage): silicon carbide content 89-92%, of which silicon 60-63%, carbon 27%, particle size 1-5MM, and the balance is impurities;

[0036] Nodulizer, the chemical composition is as follows: Mg: 5.15-5.3%, Al: 0.21-0.25%, Si: 42-46%, Ca: 1-2%, Re: 0.3-0.6%, particle size: 5-30mm;

[0037] Inoculant, chemical comp...

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Abstract

The invention discloses a melting process method for eliminating a reverse chill phenomenon of nodular cast iron. Raw materials are strictly required, and pig iron, scrap steel, carburant, silicon carbide, nodulizer, inoculant and in-flow inoculant are selected. The melting process method comprises the following steps of performing charging and melting, performing hardening and tempering, performing molten iron pretreatment, performing spheroidizing inoculation, performing pouring inoculation and performing casting unpacking. According to the melting process method for eliminating the reversechill phenomenon of the nodular cast iron, the reverse chill phenomenon is solved through three aspects of selection of the raw materials, guarantee of the contents of c and s, improvement of the solubility of rare earth and inoculation treatment, the percent of pass of products is improved, and the economic benefit of enterprises is improved.

Description

technical field [0001] The invention relates to the field of casting castings, in particular to a smelting process method for eliminating the whitening phenomenon of nodular cast iron. Background technique [0002] In the production process of nodular cast iron, due to structural reasons, some castings have white structure in the center of the casting section, which is called anti-white. The anti-white will reduce the impact strength of the material and cause difficulties in drilling. , therefore, anti-whitening is a defect of castings and should be prevented. [0003] Reasons for anti-white mouth formation: [0004] 1. Rare earth segregation: The solubility of rare earth elements in molten iron is not high, and excessive rare earth alloys gather in the final solidification zone during the solidification of molten iron, and rare earths are elements that are strong and stable carbides, so white holes are formed at the hot spots of castings . [0005] 2. Spheroidizing inocu...

Claims

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Application Information

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IPC IPC(8): C22C37/04C22C33/10C21C1/10
CPCC21C1/10C21C1/105C22C33/10C22C37/04
Inventor 王军章桂林韩虎
Owner 江苏力源金河铸造有限公司
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