Medium carbon alloy high-strength quenched and tempered steel plate and production method thereof

A technology of quenched and tempered steel plate and production method, applied in the field of iron and steel, can solve the problems of high cost, poor tensile strength, poor elongation, etc., and achieve the effects of reducing the amount of consumption, widening the range of specifications, and reducing costs

Inactive Publication Date: 2011-01-26
WUYANG IRON & STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to poor mechanical properties such as yield strength, tensile strength, and elongation of domestic large-thickness, large-weight steel, and high production costs, domestic large-thickness, large-weight structural steel plates cannot meet market demand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The medium-carbon alloy high-strength quenched and tempered steel plate of this embodiment is composed of the following components by weight percentage: C: 0.38%, Si: 0.28%, Mn: 0.73%, P: 0.007%, S: 0.001%, Mo: 0.18%, Cr: 1.03%, the balance is Fe and inevitable inclusions. Ceq is 0.75%, and the 300mm*2300 mm continuous casting slab is rolled into a 21mm*2350 mm steel plate.

[0023] The production method of the medium-carbon alloy high-strength quenched and tempered steel plate of the present embodiment, the steps are as follows:

[0024] 1) Smelting: Melt steel is smelted and vacuum decarburized to make the C content 0.38%; then it is sent to the LF refining furnace for refining and deoxidation treatment, and the content of each component in the molten steel is adjusted so that the components meet the following weight percentages : Si: 0.28%, Mn: 0.73%, P: 0.007%, S: 0.001%, Mo: 0.18%, Cr: 1.03%;

[0025] 2) Casting: Continuous casting process is used to cast the mol...

Embodiment 2

[0031] The medium-carbon alloy high-strength quenched and tempered steel plate of this embodiment is composed of the following components by weight percentage: C: 0.45%, Si: 0.30%, Mn: 0.90%, P: 0.008%, S: 0.002%, Mo: 0.15%, Cr: 0.90%, the balance is Fe and unavoidable inclusions. Ceq is 0.81%, and the 300mm*2300 mm continuous casting slab is rolled into a 40mm*2350 mm steel plate.

[0032] The production method of the medium-carbon alloy high-strength quenched and tempered steel plate of the present embodiment, the steps are as follows:

[0033] 1) Smelting: Melt steel is smelted and vacuum decarburized to make the C content 0.45%; then it is sent to the LF refining furnace for refining and deoxidation treatment, and the content of each component in the molten steel is adjusted so that the components meet the following weight percentages : Si: 0.30%, Mn: 0.90%, P: 0.008%, S: 0.002%, Mo: 0.15%, Cr: 0.90%;

[0034] 2) Casting: Continuous casting process is used to cast molten...

Embodiment 3

[0040]The medium-carbon alloy high-strength quenched and tempered steel plate of this embodiment is composed of the following components by weight percentage: C: 0.42%, Si: 0.29%, Mn: 0.60%, P: 0.006%, S: 0.002%, Mo: 0.25%, Cr: 1.20%, the balance is Fe and inevitable inclusions. Ceq is 0.81%, and the 300mm*2300 mm continuous casting slab is rolled into a 100mm*2350 mm steel plate.

[0041] The production method of the medium-carbon alloy high-strength quenched and tempered steel plate of the present embodiment, the steps are as follows:

[0042] 1) Smelting: Melt steel is smelted and vacuum decarburized to make the C content 0.45%; then it is sent to the LF refining furnace for refining and deoxidation treatment, and the content of each component in the molten steel is adjusted so that the components meet the following weight percentages : Si: 0.30%, Mn: 0.90%, P: 0.008%, S: 0.002%, Mo: 0.15%, Cr: 0.90%;

[0043] 2) Casting: Continuous casting process is used to cast molten ...

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Abstract

The invention discloses a medium carbon alloy high-strength quenched and tempered steel plate, which consists of the following components in percentage by weight: 0.38 to 0.45 percent of C, less than or equal to 0.35 percent of Si, 0.60 to 0.90 percent of Mn, less than or equal to 0.035 percent of P, less than or equal to 0.025 percent of S, 0.15 to 0.25 percent of Mo, 0.90 to 1.20 percent of Cr and the balance of Fe and inevitable impurities. The detection proves that the mechanical properties of the steel plate meet the following requirements that: (1) Re is more than or equal to 650MPa, Rmis more than or equal to 900-1,100MPa, A is more than or equal to 12 percent, Z is more than or equal to 50 percent, AKV at the temperature of 20 DEG C is more than or equal to 35J, and the surface hardness is 270 to 330HB; and (2) Rp0.2 is more than or equal to 550MPa, Rm is more than or equal to 800-1,100MPa, A is more than or equal to 12 percent, Z is more than or equal to 50 percent, AKV at the temperature of 20 DEG C is more than or equal to 35J, and the surface hardness is 270 to 330HB.

Description

technical field [0001] The invention relates to a medium-carbon alloy high-strength quenched and tempered steel plate and a production method of the steel plate, belonging to the technical field of iron and steel. Background technique [0002] With the increase in size and weight of construction machinery, the strength level of steel used in construction machinery is gradually increasing, and the amount of high-strength steel is also increasing. In order to meet market demand, it is urgent to develop high-strength quenched and tempered structural steel plates with high strength, high hardness, good wear resistance, good elongation, high reduction of area, and good impact performance. [0003] The price of imported steel from abroad is generally high, and the lead time is also long. However, some domestic steel manufacturers produce steel plates of this level, but due to the narrow range of specifications, they cannot meet the growing market demand for thick plates. [0004...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/22C22C33/04C21D8/02
Inventor 王新谢良法赵文忠李经涛韦明李建立张俊凯吴涛张亚丽张仪杰
Owner WUYANG IRON & STEEL
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