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Production method of casting-state ferrite-base ductile cast iron QT600-10

A production method, ferrite technology, applied in the field of ductile iron material control and casting production, can solve the problems of poor matrix structure uniformity, low elongation, low processing efficiency, etc., and achieve the effect of unique method and improved elongation

Active Publication Date: 2014-04-09
KOCEL EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] According to current domestic standards, for QT600 materials, the strength requirement is ≥600MPa, and the elongation requirement is ≥3%. Accounting for 40%-60%, pearlite accounts for about 40%-60%), due to the existence of pearlite structure, the elongation rate of the material is relatively low, the uniformity of the matrix structure is poor, and the processing efficiency is low
[0003] So far there is no way to overcome the above drawbacks

Method used

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  • Production method of casting-state ferrite-base ductile cast iron QT600-10

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Embodiment one: a kind of production method of as-cast ferrite base nodular cast iron QT600-10, the method comprises the following steps:

[0020] a. Selection of raw materials: The weight percentage of raw materials is as follows: ball machine iron: 20%, scrap steel: 20%, ball pig iron: 60%;

[0021] b. Selection of auxiliary materials: auxiliary materials are nodulizers and inoculants;

[0022] c. Melting:

[0023] Add steel scrap first, then add the returned materials, and finally add pig iron, and control the temperature of the melting process at 1370°C

[0024] d. Sampling seasoning: when the smelting temperature reaches 1445°C, take a spectrum sample, adjust the furnace charge again according to the composition detected by the spectrum, and adjust the carbon equivalent. After seasoning, the carbon equivalent is 4.13; the weight percentage of each chemical element in the furnace is as follows: C: 3.3, Si: 2.5, Mn: 0.21, P: 0.03, S: 0.018.

[0025] e. Spheroidiza...

Embodiment 2

[0029] a. Selection of raw materials: The weight percentage of raw materials is as follows: ball machine iron: 20%, scrap steel: 20%, ball pig iron: 60%;

[0030] b. Selection of auxiliary materials: auxiliary materials are nodulizers and inoculants;

[0031] c. Melting:

[0032] Add steel scrap first, then add the returned materials, and finally add pig iron, and control the temperature of the melting process at 1370°C

[0033] d. Sampling seasoning: when the smelting temperature reaches 1445°C, take a spectrum sample, adjust the furnace charge again according to the composition detected by the spectrum, and adjust the carbon equivalent. After seasoning, the carbon equivalent is 4.14; the weight percentage of each chemical element in the furnace is as follows: C: 3.31, Si: 2.5, Mn: 0.21, P: 0.03, S: 0.016.

[0034] e. Spheroidization inoculation treatment: first add 1.2% silicon-magnesium alloy nodulizer by weight of molten iron to one side of the nodulizer, and after compa...

Embodiment 3

[0038] a. Selection of raw materials: The weight percentage of raw materials is as follows: ball machine iron: 20%, scrap steel: 20%, ball pig iron: 60%;

[0039] b. Selection of auxiliary materials: auxiliary materials are nodulizers and inoculants;

[0040] c. Melting:

[0041] Add steel scrap first, then add the returned materials, and finally add pig iron, and control the temperature of the melting process at 1370°C

[0042] d. Sampling seasoning: when the smelting temperature reaches 1445°C, take a spectral sample, adjust the furnace charge again according to the spectral detection composition, and adjust the carbon equivalent. After seasoning, the carbon equivalent is 4.0; the weight percentage of each chemical element in the furnace is as follows: C: 3.2, Si: 2.4, Mn: 0.18, P: 0.032, S: 0.018.

[0043]e. Spheroidization inoculation treatment: Add 1.5% silicon-magnesium alloy nodulizer by weight of molten iron to one side of the nodulizer bag, and after compaction, eve...

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Abstract

The invention relates to control and casting production methods of a ductile cast iron material and particularly relates to a production method of a casting-state ferrite-base ductile cast iron QT600-10. The production method is characterized by comprising the following steps of raw material selection, auxiliary material selection, smelting, sampling, mixing, nodularizing, inoculation treatment and pouring. The production method has the advantages that the method is unique, the ductility of the ductile cast iron is obviously improved, the ductile cast iron has the mechanical properties of high strength and plasticity and good machinability, the machining cost can be lowered, and the machining efficiency is increased.

Description

technical field [0001] The invention relates to material control and casting production of nodular cast iron, in particular to a production method of as-cast ferrite-based nodular cast iron QT600-10. Background technique [0002] According to current domestic standards, for QT600 materials, the strength requirement is ≥600MPa, and the elongation requirement is ≥3%. Accounting for 40%-60%, pearlite accounts for about 40%-60%), due to the existence of pearlite structure, the elongation rate of the material is relatively low, the uniformity of the matrix structure is poor, and the processing efficiency is low. [0003] So far there is no method to overcome the above disadvantages. Contents of the invention [0004] The purpose of the present invention is to overcome the defects of the prior art, to provide a unique method, significantly improved elongation, mechanical properties of high strength and high plasticity, good processing performance, which can reduce processing co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C33/10C22C37/04C21C1/10
Inventor 杨万虎周文军薛蕊莉陈孝先张守全
Owner KOCEL EQUIP
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