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Method for preparing bainite wear-resistant cast steel

A bainite and cast steel technology, applied in the field of wear-resistant cast steel manufacturing, can solve the problems of difficult process control and high production cost, and achieve the effects of simple and easy control of casting and heat treatment process, long service life and low production cost

Inactive Publication Date: 2013-01-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production cost of this technology is high, and the process is not easy to control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) Steel scrap, ferromanganese, ferrosilicon, ferromolybdenum, ferrochrome, ferrotitanium, ferrovanadium, rare earth silicon (RE) are used as raw materials for smelting, and the chemical composition is as follows in weight percentage: C: 0.2%; Si: 0.7% ; Mn: 0.3%; Mo: 0.1%; Cr: 0.2%; Ti: 0.1%; V: 0.1%; RE: 0.2%;

[0019] 2) When the scrap steel is added to the electric furnace and the temperature reaches 1500°C, ferromanganese, ferrosilicon, and ferromolybdenum are added in turn to wait for all of them to be melted, then add ferrochrome to further melt, deoxidize with aluminum wire, and then melt the molten steel Pour into the ladle where ferrotitanium, ferrovanadium, rare earth and RE are placed at the same time (the particle size of each raw material is about 5-10mm, and try to put it on the bottom of the ladle) and let it stand for 1 minute until it is completely melted.

[0020] 3) Pouring is performed when the temperature of the ladle is 1550°C, and the casting is ...

Embodiment 2

[0025] The process step of the present embodiment is the same as embodiment 1, but some of the process parameters are slightly different:

[0026] 1) Chemical composition according to the following weight percentages: C: 0.6%; Si: 2.5%; Mn: 3.0%; Mo: 1.5%; Cr: 3.0%; Ti: 0.5%; V: 0.5%; RE: 0.5 %; S, P: 0.06%, the rest is Fe for ingredients.

[0027] 3) Pouring is performed when the temperature of the ladle is 1500°C, and the casting is taken out of the box 2 hours after the pouring is completed and the sand is cleaned.

[0028] 4) Put the sand-cleaned casting into the electric furnace, heat up at a heating rate of 300°C / hour, and heat-preserve when the temperature reaches 1000°C. The maximum thickness of the casting is 20mm, and the determined heat-holding time is 1 hour; the heat-preservation is completed Then take it out of the oven quickly and put it in a 350°C salt bath furnace for heat preservation (the heat preservation time is the same as before), and finally take it ou...

Embodiment 3

[0032] The process step of the present embodiment is the same as embodiment 1, but some of the process parameters are slightly different:

[0033] 1) Chemical composition according to the following weight percentage: C: 0.4%; Si: 1.5%; Mn: 2.0%; Mo: 1.0%; Cr: 1.8%; Ti: 0.05%; V: 0.03%; RE: 0.03%; S, P: 0.04%, the rest is Fe for batching.

[0034] 3) When the temperature of the ladle is 1520°C, pouring is carried out, and the casting is taken out of the box 2 hours after the pouring is completed, and the sand is cleaned.

[0035] 4) Put the casting after sand cleaning treatment into the electric furnace, heat up at a heating rate of 200°C / hour, and carry out heat preservation treatment when the temperature reaches 980°C. The maximum thickness of the casting is 80mm, and the determined heat preservation time is 4 hours; heat preservation is completed Then take it out of the oven quickly and put it in a 300 ℃ salt bath furnace for heat preservation (the heat preservation time is...

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Abstract

The invention discloses a method for preparing bainite wear-resistant cast steel. The method includes the steps: taking steel scrap, (manganese, silicon, molybdenum, chromium, titanium and vanadium), ferrum, rare earth and RE as smelting raw materials; distributing the materials according to the weight percent of 0.2-0.6% of C, 0.7-2.5% of S, 0.3-3.0% of Mn, 0.1-1.5% of Mo, 0.2-3.0% of Cr, less than or equal to 0.5% of Ti, less than or equal to 0.5% of V, less than or equal to 0.5% of RE, less than or equal to 0.06% of S and P and the balance of Fe; completely melting down and then deoxidizing the steel scrap, (manganese, silicon, molybdenum and ferrochromium) and the like and pouring liquid steel into a ladle simultaneously holding ferrotitanium, ferrovanadium, rare earth and RE; casting the liquid steel at the temperature of 1500-1550 DEG C; placing a casting into a heat treatment furnace, increasing the temperature to 850-1000 DEG C and keeping the temperature; and placing the casting into a salt-bath furnace with the temperature of 200-350 DEG C, keeping the temperature and finally discharging the casting to be air-cooled to obtain the bainite wear-resistant cast steel.

Description

technical field [0001] The invention relates to a manufacturing technology of wear-resistant cast steel used under impact, in particular to a preparation method of bainitic wear-resistant cast steel. Background technique [0002] Wear-resistant cast steel is a wear-resistant material widely used in metallurgy, building materials, mines, cement and other fields. From the composition of the material, the widely used wear-resistant cast steel can generally be divided into: austenitic wear-resistant steel, martensitic Austenitic wear-resistant steel and bainitic wear-resistant steel, the typical representative of austenitic wear-resistant steel is traditional high manganese steel, which is used after water toughening treatment, the hardness is about HB150-250, and the toughness is about 150-300J / cm 2 . It is mainly suitable for high-stress wear conditions; martensitic wear-resistant steel mainly refers to low-carbon diversified low-alloy steel, which is used after quenching and...

Claims

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Application Information

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IPC IPC(8): C22C38/60B22D1/00C21D1/46C21D6/00
CPCY02P10/20
Inventor 皇志富邢建东高义民马胜强李烨飞
Owner XI AN JIAOTONG UNIV
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