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Heat treatment method of high-strength high-toughness hot continuous rolling steel plate for engineering machine

A heat treatment method and technology of construction machinery, applied in heat treatment furnaces, heat treatment equipment, manufacturing tools, etc., can solve problems such as steel plate deformation, steel plate bending or waves, etc.

Inactive Publication Date: 2008-03-19
WUHAN IRON & STEEL (GROUP) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] If there is a large internal stress in the hot-rolled steel plate, it is easy to deform the steel plate due to the release of internal stress during cutting and welding during use by the user; The steel plate appears warped or wavy, which affects the normal use of the steel plate, but the existing process route cannot solve the internal stress, anisotropy and some performance defects of the produced hot-rolled steel plate due to the lack of delivery technical conditions for subsequent processing means , can only be changed to steel or scrapped

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Handle 16 mm thick crane HG70 steel plate, its composition and weight percentage and its steps:

[0019] 1), the components and weight percentages are: C: 0.04%, Si: 0.18%, Mn: 1.65%, P: ≤0.02%, S: ≤0.006%, AlS0.03%, Ni: 0.4%, Cr: 0.35%, Ti: 0.005%, Mo: 0.12%, Nb: 0.045%, and the rest is Fe and unavoidable impurities for hot-rolled steel sheets;

[0020] 2) Tempering for 50 minutes at 530°C;

[0021] 3) Carry out quality inspection on the tempered hot-rolled steel plate and wait for use.

[0022] After testing, the impact energy has reached 54J, its strength meets the standard, and the surface of the board is smooth without waves.

Embodiment 2

[0024] Handle 16 mm thick crane HG70 steel plate, its composition and weight percentage and its steps:

[0025] 1), the components and weight percentages are: C: 0.045%, Si: 0.18%, Mn: 1.6%, P: ≤0.02%, S: ≤0.006%, AlS0.035%, Ni: 0.30%, Cr: 0.35%, Ti: 0.005%, Mo: 0.12%, Nb: 0.045%, and the rest is Fe and unavoidable impurities for hot-rolled steel sheets;

[0026] 2) Tempering for 46 minutes at 550°C;

[0027] 3) Carry out quality inspection on the tempered hot-rolled steel plate and wait for use.

[0028] After testing, the impact energy has reached 67J, its strength meets the standard, and the surface of the board is smooth without waves.

Embodiment 3

[0030] Process the HG70 steel plate for coal mine excavators with a thickness of 20 mm, its composition and weight percentage and its steps:

[0031] 1), the components and weight percentages are: C: 0.05%, Si: 0.18%, Mn: 1.6%, P: ≤0.02%, S: ≤0.006%, AlS0.035%, Ni: 0.30%, Cr: 0.35%, Ti: 0.005%, Mo: 0.12%, Nb: 0.045%, and the rest is Fe and unavoidable impurities for hot-rolled steel sheets;

[0032] 2) Tempering for 42 minutes at 580°C;

[0033] 3) Carry out quality inspection on the tempered hot-rolled steel plate and wait for use.

[0034] After testing, the impact energy has reached 78J, its strength meets the standard, and the surface of the board is smooth without waves.

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Abstract

The present invention belongs to a heat treatment method for a hot tandem rolling steel plate with high intensity and high toughness used for engineering machinery. The method solves the deficiencies that because of the releasing of the internal stress of the current hot tandem rolling steel plate, bulge or wave appears on the steel plate, thereby influencing the normal use of the steel plate. In order to solve the problems, the present invention provides the technical measures that the hot tandem rolling plate has the components and the weight percentages that C is 0.03 -0.06 percent, Si is 0.15 -0.35 percent, Mn is 1.65-1.75 percent, P is less than or equal to 0.02 percent, S is less than or equal to 0.006 percent, AlS is 0.02-0.05 percent, Ni is 0.3 -0.4 percent, Cr is 0.25-0.35 percent, Ti is 0.005-0.02 percent, Mo is 0.1-0.2 percent, Nb is 0.04-0.05 percent, and the residual is Fe and the inevitable impurity, and cross cutting is performed to the hot tandem rolling plate; 30-50 minute tempering processing is performed within the range of 530 to 620 DEG C; quality testing is performed to the hot tandem rolling steel plate after the tempering processing, and the hot tandem rolling steel plate is stand-by. The present invention can reduce or even eliminate the internal stress and the anisotropism of the hot tandem rolling steel plate, improve the toughness index, have good stability, and be uneasy to be distorted after cutting, thereby meeting the market request.

Description

technical field [0001] The invention relates to a production method of a steel plate, and belongs to a heat treatment method for a high-strength and high-toughness hot continuous rolling steel plate for construction machinery. Background technique [0002] If there is a large internal stress in the hot-rolled steel plate, it is easy to deform the steel plate due to the release of internal stress during cutting and welding during use by the user; The steel plate appears warped or wavy, which affects the normal use of the steel plate, but the existing process route cannot solve the internal stress, anisotropy and some performance defects of the produced hot-rolled steel plate due to the lack of delivery technical conditions for subsequent processing means , can only be changed to steel or scrapped. [0003] The reason for the defect [0004] At present, the outlet temperature of RT2 is set at about 1000°C, the outlet thickness of 16mm steel plate RT2 is 45mm, and the outlet ...

Claims

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Application Information

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IPC IPC(8): C22C38/58C21D9/52C21D1/00
Inventor 皮昕宇李国彬张先贵占有元陆在学范敬国段东明徐静波
Owner WUHAN IRON & STEEL (GROUP) CORP
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