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Low-carbon bainite steel and preparation method thereof

A technology of carbon bainite steel and martensite, applied in the field of low-carbon bainite steel and its preparation, can solve the problems of high price and high manufacturing cost of low-carbon bainite steel, and achieve low cost and simple manufacturing method , a wide range of effects

Inactive Publication Date: 2008-01-16
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In traditional bainitic steel, V, Mo, Mn, B, Cr and other alloying elements are generally added. Due to the high price of alloys such as Mo and B, the manufacturing cost of low-carbon bainitic steel is relatively high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Ingredients:

[0039] Carry out batching according to the mass percentage of following table, all the other are Fe.

[0040] the element

C

mn

Si

Cr

S

P

Content (%)

0.12

1.0

1

0.2

≤0.05

≤0.05

[0041] 2. Melting:

[0042] The prepared raw materials are smelted in a medium-frequency induction melting furnace at a melting temperature of 1600°C. After the raw materials are melted, electromagnetic stirring is carried out for 10 minutes to make the alloy composition more uniform. Cast after the electromagnetic stirring is over, and the casting temperature is 1550°C.

[0043] 3. Heat treatment:

[0044] When the temperature of the sample obtained after casting is cooled to 920°C, it is directly placed in an alkaline aqueous solution with a pH value of 10 and a specific gravity of 1.05 for quenching.

[0045] 4. Metallographic observation:

[0046] Use a wire cutti...

Embodiment 2

[0050] 3. Ingredients:

[0051] Carry out batching according to the mass percentage of following table, all the other are Fe.

[0052] the element

C

mn

Si

Cr

S

P

Content (%)

0.43

2.6

2

0.8

≤0.05

≤0.05

[0053] 4. Melting:

[0054] The prepared raw materials are smelted in a medium-frequency induction melting furnace at a melting temperature of 1500°C. After the raw materials are melted, electromagnetic stirring is carried out for 20 minutes to make the alloy composition more uniform. Cast after the electromagnetic stirring is over, and the casting temperature is 1580°C.

[0055] 3. Heat treatment:

[0056] When the temperature of the sample obtained after casting is cooled to 940°C, it is directly placed in an alkaline aqueous solution with a pH value of 12 and a density of 1.15 for quenching.

[0057]4. Metallographic observation:

[0058] Use a wire cutting machine...

Embodiment 3

[0062] 5. Ingredients:

[0063] Carry out batching according to the mass percentage of following table, all the other are Fe.

[0064] the element

C

mn

Si

Cr

S

P

Content (%)

0.38

2.1

1.5

0.5

≤0.05

≤0.05

[0065] 6. Melting:

[0066] The prepared raw materials are smelted in a medium-frequency induction melting furnace at a melting temperature of 1550°C. After the raw materials are melted, electromagnetic stirring is carried out for 15 minutes to make the alloy composition more uniform. Cast after the electromagnetic stirring is over, and the casting temperature is 1500°C.

[0067] 3. Heat treatment:

[0068] When the temperature of the sample obtained after casting is cooled to 880°C, it is directly placed in an alkaline aqueous solution with a pH value of 14 and a density of 1.65 for quenching.

[0069] 4. Metallographic observation:

[0070] Use a wire cutting mach...

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Abstract

The invention relates to a low-carbon bainitic steel and the preparation method thereof. The low-carbon bainitic steel contains (mass percentage): 0.12-0.43 percent of C, 1.0-2.6 percent of Mn, 1-2 percent of Si, 0-0.8 percent of Cr, 0-0.05 percent of S, and 0-0.05 percent of P and Fe. The preparation method comprises the steps: (1) compounding; (2) smelting at 1500-1600 DEG C, electromagnetically stirring, and casting; and (3) performing quenching treatment of waste heat of alkaline aqueous solution at a quenching temperature of 880-940 DEG C, the pH value of alkaline aqueous solution being 9-14 and density 1.00-1.65. The inventive low-carbon bainitic steel has high strength and toughness and high wearability, and is widely used in the fields of engineering machinery, bridge construction, ship industry, container industry, pressure vessel industry. The preparation method has simple operation, low cost and high efficiency and is suitable for industrial production.

Description

technical field [0001] The invention belongs to the field of bainite steel, in particular to a low-carbon bainite steel and a preparation method thereof. Background technique [0002] Since the first discovery of bainite structure by Robertso in the late 1920s, material scientists at home and abroad have devoted themselves to the research of bainite structure and bainite phase transformation theory and the development and application of bainite steel. In the 1950s, Mo-B series bainite steel appeared, and in the 1970s, Mn-B series bainite steel appeared. Because it has both excellent wear resistance and high strength and toughness, it has been initially applied in the fields of mining, metallurgy, electric power, building materials, chemical industry, etc., especially in wear-resistant steel balls, scrapers, wear-resistant transmission pipes, etc. Good application effect has been achieved on parts. At present, the preparation methods of bainite steel mainly include isotherm...

Claims

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Application Information

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IPC IPC(8): C22C38/04C22C38/18C22C38/38C22C33/04B22D37/00C21D1/18
Inventor 季诚昌潘金平朱世根
Owner DONGHUA UNIV
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