Cast steel added with rare earth elements

Abstract

The invention relates to the field of cast steel, in particular to cast steel added with rare earth elements. The invention discloses the cast steel added with rare earth elements; it is characterizedin that the cast steel comprises the following components by mass: C: 0.12% to 0.28%; 0.7%-1.3% of Si, 0.3%-0.9% of Mn, 3%-9% of Cr, 0.01%-0.5% of Mo, 0.05%-1% of V, 0.01%-0.05% of Al, 0.2%-0.6% ofrare earth element RE, less than or equal to 0.03% of S, less than or equal to 0.03% of P and the balance of Fe. The invention solves the problem that although the existing cast steel added with rareearth elements is very high in hardness, yet often insufficient in toughness.

Description

technical field

[0001] The invention relates to the field of cast steel, in particular to a cast steel added with rare earth elements. Background technique

[0002] The economic losses caused by atmospheric corrosion of steel and other materials account for a large proportion of material failure. As cast steel is a steel material used in large quantities in the atmosphere, the research on its corrosion has been paid attention to for a long time. According to a large number of studies, rare earth elements can not only improve the corrosion resistance of steel by refining grains, but also produce other special effects. For example, the addition of rare earth yttrium can improve the high temperature oxidation resistance of stainless steel.

[0003] my country is a rare earth country with the most abundant rare earth resources and output in the world, and it is also a big steel country with the largest steel output. If the beneficial effects of rare earths on carbon steel can b...

Examples

Embodiment 1

[0037] A method for preparing cast steel added with rare earth elements, comprising the following steps:

[0038] Step 1, weighing 0.12 parts of La, 0.36 parts of Ce and 0.12 parts of Y and placing them in a ball mill for mechanical ball milling under the protection of argon to obtain nanometer rare earth elements RE;

[0039] Step 2, weigh 45 parts of pig iron and 20 parts of scrap steel and put them into an electric furnace to melt, add 3 parts of ferrosilicon, 1.8 parts of ferromanganese, 12 parts of ferrochrome, 1.2 parts of ferromolybdenum, and 1.6 parts of ferrovanadium, desulfurize after melting, so that S≤ 0.005%; dephosphorization, so that P≤0.005%; slag removal, to obtain mixed molten steel;

[0040] Step 3, inject the mixed molten steel into the AOD furnace through the ladle, blow oxygen and decarburize, and make the carbon content meet the process requirements;

[0041] Step 4, transfer the molten steel after decarburization in step 3 into a refining furnace, dete...

Embodiment 2

[0053] A method for preparing cast steel added with rare earth elements, comprising the following steps:

[0054] Step 1, weighing 0.04 parts of La, 0.12 parts of Ce and 0.04 parts of Y and placing them in a ball mill under the protection of argon for mechanical ball milling to obtain nanometer rare earth elements RE;

[0055] Step 2, weigh 40 parts of pig iron and 15 parts of scrap steel and put them into an electric furnace to melt, add 2.5 parts of ferrosilicon, 1.2 parts of ferromanganese, 7 parts of ferrochrome, 0.2 parts of ferromolybdenum, and 1.1 parts of ferrovanadium, desulfurize after melting, so that S≤ 0.005%; dephosphorization, so that P≤0.005%; slag removal, to obtain mixed molten steel;

[0056] Step 3, inject the mixed molten steel into the AOD furnace through the ladle, blow oxygen and decarburize, and make the carbon content meet the process requirements;

[0057] Step 4, transfer the molten steel after decarburization in step 3 into a refining furnace, det...

Embodiment 3

[0069] A raw material for cast steel added with rare earth elements, in parts by weight, consists of the following components:

[0070] 50 parts of pig iron, 25 parts of steel scrap, 4.5 parts of ferrosilicon, 2.4 parts of ferromanganese, 15 parts of ferrochromium, 2 parts of ferromolybdenum, 2.1 parts of ferrovanadium, 0.05 parts of aluminum particles, 0.16 parts of rare earth element La, 0.48 part of rare earth element Ce, Rare earth element Y 0.16 part;

[0071] The preparation method of the above-mentioned cast steel added with rare earth elements comprises the following steps:

[0072] Step 1, weighing 0.16 parts of La, 0.48 parts of Ce and 0.16 parts of Y and placing them in a ball mill for mechanical ball milling under the protection of argon to obtain nanometer rare earth elements RE;

[0073] Step 2, weigh 50 parts of pig iron and 25 parts of scrap steel and put them into an electric furnace to melt, add 4.5 parts of ferrosilicon, 2.4 parts of ferromanganese, 15 part...

technical field

[0001] The invention relates to the field of cast steel, in particular to a cast steel added with rare earth elements. Background technique

[0002] The economic losses caused by atmospheric corrosion of steel and other materials account for a large proportion of material failure. As cast steel is a steel material used in large quantities in the atmosphere, the research on its corrosion has been paid attention to for a long time. According to a large number of studies, rare earth elements can not only improve the corrosion resistance of steel by refining grains, but also produce other special effects. For example, the addition of rare earth yttrium can improve the high temperature oxidation resistance of stainless steel.

[0003] my country is a rare earth country with the most abundant rare earth resources and output in the world, and it is also a big steel country with the largest steel output. If the beneficial effects of rare earths on carbon steel can b...

Examples

Embodiment 1

[0037] A method for preparing cast steel added with rare earth elements, comprising the following steps:

[0038] Step 1, weighing 0.12 parts of La, 0.36 parts of Ce and 0.12 parts of Y and placing them in a ball mill for mechanical ball milling under the protection of argon to obtain nanometer rare earth elements RE;

[0039] Step 2, weigh 45 parts of pig iron and 20 parts of scrap steel and put them into an electric furnace to melt, add 3 parts of ferrosilicon, 1.8 parts of ferromanganese, 12 parts of ferrochrome, 1.2 parts of ferromolybdenum, and 1.6 parts of ferrovanadium, desulfurize after melting, so that S≤ 0.005%; dephosphorization, so that P≤0.005%; slag removal, to obtain mixed molten steel;

[0040] Step 3, inject the mixed molten steel into the AOD furnace through the ladle, blow oxygen and decarburize, and make the carbon content meet the process requirements;

[0041] Step 4, transfer the molten steel after decarburization in step 3 into a refining furnace, dete...

Embodiment 2

[0053] A method for preparing cast steel added with rare earth elements, comprising the following steps:

[0054] Step 1, weighing 0.04 parts of La, 0.12 parts of Ce and 0.04 parts of Y and placing them in a ball mill under the protection of argon for mechanical ball milling to obtain nanometer rare earth elements RE;

[0055] Step 2, weigh 40 parts of pig iron and 15 parts of scrap steel and put them into an electric furnace to melt, add 2.5 parts of ferrosilicon, 1.2 parts of ferromanganese, 7 parts of ferrochrome, 0.2 parts of ferromolybdenum, and 1.1 parts of ferrovanadium, desulfurize after melting, so that S≤ 0.005%; dephosphorization, so that P≤0.005%; slag removal, to obtain mixed molten steel;

[0056] Step 3, inject the mixed molten steel into the AOD furnace through the ladle, blow oxygen and decarburize, and make the carbon content meet the process requirements;

[0057] Step 4, transfer the molten steel after decarburization in step 3 into a refining furnace, det...

Embodiment 3

[0069] A raw material for cast steel added with rare earth elements, in parts by weight, consists of the following components:

[0070] 50 parts of pig iron, 25 parts of steel scrap, 4.5 parts of ferrosilicon, 2.4 parts of ferromanganese, 15 parts of ferrochromium, 2 parts of ferromolybdenum, 2.1 parts of ferrovanadium, 0.05 parts of aluminum particles, 0.16 parts of rare earth element La, 0.48 part of rare earth element Ce, Rare earth element Y 0.16 part;

[0071] The preparation method of the above-mentioned cast steel added with rare earth elements comprises the following steps:

[0072] Step 1, weighing 0.16 parts of La, 0.48 parts of Ce and 0.16 parts of Y and placing them in a ball mill for mechanical ball milling under the protection of argon to obtain nanometer rare earth elements RE;

[0073] Step 2, weigh 50 parts of pig iron and 25 parts of scrap steel and put them into an electric furnace to melt, add 4.5 parts of ferrosilicon, 2.4 parts of ferromanganese, 15 part...

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