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Production method of non alloy precooled isothermal bardening austenic globe body

A technology of austempering and production methods, which is applied in the production field of non-alloy precooling and austempering ausferitic ductile iron, to achieve the effect of ensuring safety and expanding the scope of application

Inactive Publication Date: 2004-07-21
包文华 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a kind of production method of non-alloy double-liquid quenching ausferitic ductile iron, to solve the above-mentioned problems in the production process of traditional ausferitic nodular iron, that is, it is necessary to add alloy elements such as Ni, Mo, Cu and the like to the workpiece Problems with salt bath isothermal quenching

Method used

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  • Production method of non alloy precooled isothermal bardening austenic globe body

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Effect test

Embodiment 1

[0016] 1. Casting method:

[0017] The composition of the non-alloy precooling austempering austeric ductile iron is (weight percent):

[0018] C 3.55% Si 2.63% Mn 0.3%

[0019] P 0.05% S 0.012% Mg 0.035%

[0020] Rare earth element RE 0.02%

[0021] The rest is Fe

[0022] The conventional casting method is adopted, that is, pig iron, scrap steel, recycled materials, ferrosilicon, and ferromanganese are selected in different proportions to ensure the content of C, Si, and Mn, and low-phosphorus pig iron is selected to ensure the content of P, and low-S pig iron is selected. The S method ensures the S content, and selects the appropriate amount of nodulizer to ensure the RE and Mg content; the melting adopts a 0.5T intermediate frequency electric furnace, and according to the rapid detection results before the furnace, add carburant, pig iron, scrap steel, ferrosilicon, ferromanganese, etc. , the added alloy elements must be added into the furnace 10 minutes before the sph...

Embodiment 2

[0026] 1. Casting method:

[0027] The composition of the non-alloy precooling austempering austeric ductile iron is (weight percent):

[0028] C 3.6% Si 2.64% Mn 0.26%

[0029] P 0.04% S 0.010% Mg 0.035%

[0030] Rare earth elements RE 0.03%

[0031] The rest is Fe

[0032] Adopt conventional casting method, with embodiment one,

[0033] 2. Heat treatment method of castings

[0034] Heat the machined casting to 850°C in a trolley-type resistance furnace and keep it warm for 1.5 hours, then cool it to 790°C and keep it warm for 0.5 hours. When the oil is cooled to 250°C, it is transferred to an air isothermal furnace at 360°C, kept warm for 2 hours, then released from the furnace, and cooled in air.

Embodiment 3

[0036] 1. Casting method:

[0037] The composition of the non-alloy precooling austempering austeric ductile iron is (weight percent):

[0038] C 3.67% Si 2.69% Mn 0.40%

[0039] P 0.03% S 0.008% Mg 0.040%

[0040] Rare earth element RE 0.04%

[0041] The rest is Fe

[0042] Adopt conventional casting method, with embodiment one,

[0043] 2. Heat treatment method of castings

[0044] Heat the machined casting to 860°C in a trolley-type resistance furnace and keep it warm for 2 hours, then cool it to 790°C and keep it warm for 0.5 hours. When it is cooled to 260°C, the oil comes out, and it is transferred to an air isothermal furnace at 370°C, kept for 1.5 hours, then released from the furnace, and air-cooled.

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Abstract

A non-alloy spherulitic austenite iron contains C (3.5-3.8 wt.%), Si (2.6-2.85), Mn (0.2-0.4), P (<or=0.05), S (0.005-0.015) Mg (0.03-0.045), RE (0.02-0.04) and Fe (rest). Its heat treating process includes heating to 840-900 deg.C in resistance furnace, holding the temp for 1-2 hr, cooling to 780-800 deg.C, holding the temp for 0.5-1 hr, quenching in oil to 300-230 deg.C, holding the temp in isothermal furnace, and cooling in air. Its advantages are no need of noble alloy elements, and high safety.

Description

technical field [0001] The invention belongs to the field of production methods of metal materials, in particular to a production method of nodular cast iron. Background technique [0002] As the latest development of ductile iron, austempered ductile iron, abbreviated as ADI in English, Austempered Ductile Iron, has become an important engineering material due to its excellent comprehensive mechanical properties. Its high strength, high toughness, impact resistance and fatigue resistance have attracted widespread attention, and have been successfully applied in industries such as machinery, metallurgy, transportation and building materials, and its application fields are still expanding. However, there are two important conditions to produce ausferitic ductile iron with qualified mechanical properties. First, due to the reason of hardenability, in order to ensure the uniformity of the workpiece structure and the stability of production, when the workpiece wall thickness is ...

Claims

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Application Information

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IPC IPC(8): C22C33/08C22C37/04
Inventor 包文华
Owner 包文华
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