Large-section cast ferrite nodular cast iron and preparation method thereof

A ductile iron and ferrite technology, which is applied in the field of large-section as-cast ferritic ductile iron QT580-15A and its preparation, can solve problems such as great influence

Active Publication Date: 2015-10-21
JIANGSU JIXIN WIND ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] The application number is CN201310368533.0, and the Chinese patent application whose publication number is CN104419862A is "a kind of full ferritic ductile iron and its production method". The wall thickness of the ductile iron produced by this method is not mentioned, but the wall thickness of the material is great influence

Method used

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  • Large-section cast ferrite nodular cast iron and preparation method thereof
  • Large-section cast ferrite nodular cast iron and preparation method thereof
  • Large-section cast ferrite nodular cast iron and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Preparation of a stepped ingot of 300mm×300mm×300mm+200mm×200mm×200mm+150mm×150mm×150mm. For the structure and size of the stepped ingot, see figure 1 .

[0035]According to the method of the invention, the element composition of the ductile iron material: C: 3.1-3.5wt%, Si: 3.0-4.0wt%, Mn≤0.3wt%, P≤0.04wt%, S: 0.01-0.03wt%, Sb : 0.001-0.006wt%, Mg: 0.03-0.05wt%, Re: 0.01-0.03wt%, and the rest is iron and impurities produced during the preparation process.

[0036] The ductile iron material of the above formula (pig iron: 40-60wt%, steel scrap: 10-30wt%, recycle material: 20-40wt%) is first smelted, and the temperature of the molten iron is controlled to be 1430-1460°C. Carry out spheroidizing treatment, the formula of spheroidizing agent is Mg 5-7wt%, Si 40-50wt%, Re 0.5-1.0wt% and the rest is iron, the addition of nodulizing agent is 1.0~1.2wt% of total molten iron, A covering agent is added on the nodulizer, the covering agent is a low-silicon, high-iron...

Embodiment 2

[0040] Embodiment 2: the preparation made with the square ingot of 400mm * 400mm * 400mm

[0041] According to the method of the invention, the element composition of the ductile iron material: C: 3.1-3.5wt%, Si: 3.0-3.8wt%, Mn≤0.3wt%, P≤0.04wt%, S: 0.01-0.03wt%, Sb : 0.001-0.006wt%, Mg: 0.03-0.05wt%, Re: 0.01-0.03wt%, and the rest is iron and impurities produced during the preparation process.

[0042] The nodular cast iron material of the above formula is first smelted, and the temperature of the molten iron is controlled to be 1420-1450° C. for spheroidizing treatment, and the rest is the same as in Example 1.

[0043] The production shows that the performances of the 400mm×400mm×400mm square ingot prepared by the method of this embodiment are as follows: tensile strength 586MPa, 545MPa, yield strength 459MPa, 440MPa , Elongation 19%, 16%, the organization of the material is a pure ferrite matrix organization.

Embodiment 3

[0045] Preparation of high-strength and high-toughness ferritic nodular cast iron with large cross-section (wall thickness greater than 60 mm). The 2.5MW wind power bearing end cover casting is selected for trial production. The bearing end cover has a single weight of 0.8 tons and a main wall thickness of 100-220mm. Follow the steps below:

[0046] Select pig iron: 50wt%, steel scrap: 20wt%, recycle material: 30wt%; first smelt, pig iron, scrap steel, and recycle material are melted together, and the temperature of the molten iron is controlled to be 1460°C. Carry out spheroidizing treatment, the formula of spheroidizing agent is Mg 5.5wt%, Si 42wt%, Re 0.6wt%, the rest is iron, the addition amount of spheroidizing agent is the total amount of molten iron 1.15wt%, add covering on the spheroidizing agent The covering agent is a low-silicon, high-iron, Ba-silicon-containing ferrosilicon covering agent, and the amount of the covering agent added is 0.6wt% of the total amount of ...

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Abstract

The invention belongs to the technical field of nodular cast irons, concretely relates to control and casting production of a nodular cast iron material, and especially relates to a large-section cast ferrite nodular cast iron QT580-15A and a preparation method thereof. Performances of a separately cast test block with the wall thickness being greater than 60mm and an attached test block with the thickness of 70mm respectively meet requirements (separate cast: the tensile strength is not smaller than 580MPa, the yield strength is not smaller than 450MPa, and the elongation is not smaller than 15%; and attached cast: the tensile strength is not smaller than 530MPa, the yield strength is not smaller than 400MPa, and the elongation is not smaller than 12.5%) through selecting raw materials, controlling the components of molten iron, optimizing a nodulizer, a covering agent and a technology, determining an inoculant and the technology, and controlling the addition amount and the addition method of trace alloy elements.

Description

technical field [0001] The invention belongs to the technical field of nodular cast iron, and in particular relates to the control and casting production of nodular cast iron materials, in particular to QT580-15A large-section as-cast ferritic nodular cast iron and a preparation method thereof. Background technique [0002] In the current national standard "GBT 1348-2009 Ductile Iron Castings", there are two grades of QT500, QT500-7A and QT500-10A, for the performance of QT500 with attached casting test block, the former is ferrite-pearlite mixed base ductile iron, The latter is silicon solid solution strengthened ferritic ductile iron, which is a new type of ductile iron. The performance indicators of the two materials are shown in Table 1. As shown in Table 1, under the condition that the strength reaches 500Mpa, the maximum elongation is 10%. [0003] Table 1 Performance indicators of QT500-7A and QT500-10A in GBT 1348-2009 [0004] [0005] QT580-15A belongs to sili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/10C22C37/04C22C33/08C21C1/10
CPCY02P10/20
Inventor 王星王美喜史学勇闫兴义陈柏林
Owner JIANGSU JIXIN WIND ENERGY TECH
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