Thermal treatment method for super-thick steel plate

A heat treatment method and a technology of extra-thick steel plates, which are applied in the field of heat treatment, can solve problems such as difficulty, large internal stress, and coarse surface layer, and achieve the effects of good quenching effect, uniform structure, and stable performance

Inactive Publication Date: 2013-07-24
LAIWU IRON & STEEL GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] For alloy steel plates, it is difficult to control the quenching process, mainly because: to obtain martensite during quenching, the quenching cooling rate must be greater than the critical cooling rate, and rapid cooling will inevitably cause great damage. Internal stress often causes deformation and cracking of the steel plate
Especially, for extra-thick steel plates over 100mm, currently limited by the cooling capacity of the equipment, water quenching causes a large temperature difference between the core of the steel plate, and as the thickness of the steel plate increases, the quenching cooling rate gradually weakens, and the core cooling rate Insufficient, the structure is thicker than the surface layer, and massive proeutectoid ferrite appears, which cannot achieve a good quenching effect
[0003] At present, there is no reference experience for the use of roll-type quenching machines in China for quenching extra-thick steel plates above 100mm.

Method used

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  • Thermal treatment method for super-thick steel plate
  • Thermal treatment method for super-thick steel plate
  • Thermal treatment method for super-thick steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The production specification is thickness × width × length = 100mm × 2200mm × 12000mm alloy steel plate.

[0028] The chemical composition of the extra-thick alloy steel plate of the above specifications is calculated by weight percentage (wt%) as follows: C0.38wt%, Si0.25wt%, Mn0.50wt%, P0.018wt%, S0.010wt%, Cr1.20wt%, Mo0.28wt%, Als0.025wt%, the rest is Fe and unavoidable impurities. Adopt the technological process of shot blasting treatment→heating in quenching furnace→cooling after furnace.

[0029] 1) Shot blasting treatment

[0030] The diameter of the steel shot is 2.0mm, and the rotational speed of the projectile is 100m / s.

[0031] 2) heating

[0032] The heating temperature is set at 920°C, the heating rate is 1.3°C / mm, the heat preservation time is 30min, and the time in the furnace is 160min±5min.

[0033] 3) Cooling after furnace

[0034] The running speed of the steel plate in the high-pressure section of the quenching machine is 3.0m / min, and the tim...

Embodiment 2

[0037] The production specification is thickness × width × length = 120mm × 2200mm × 9000mm alloy steel plate.

[0038]The chemical composition of the extra-thick alloy steel plate of the above specifications is calculated by weight percentage (wt%) as follows: C0.37wt%, Si0.23wt%, Mn0.55wt%, P0.015wt%, S0.008wt%, Cr1.30wt%, Mo0.25wt%, Als0.020wt%, the rest is Fe and unavoidable impurities. Adopt the technological process of shot blasting treatment→heating in quenching furnace→cooling after furnace.

[0039] 1) Shot blasting treatment

[0040] The diameter of the steel shot is 2.0mm, and the rotational speed of the projectile is 100m / s.

[0041] 2) heating

[0042] The heating temperature is set at 920°C, the heating rate is 1.3°C / mm, the heat preservation time is 30min, and the time in the furnace is 190min±5min.

[0043] 3) Cooling after furnace

[0044] The running speed of the steel plate in the high-pressure section of the quenching machine is 3.0m / min, and the time ...

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Abstract

The invention provides a thermal treatment method for a super-thick steel plate. The thermal treatment method for the super-thick steel plate provided by the invention comprises the following steps of: performing shot blasting on the steel plate; placing the steel plate after shot blasting in a heating furnace to heat, wherein the heating temperature is controlled at 900-920 DEG C, and insulating for 20-30minutes after the steel plate reaches a predetermined temperature; quenching and cooling the heated steel plate, wherein the steel plate passes through a high pressure section and a low pressure section of a quencher sequentially; then, water-cooling to room temperature, wherein the steel plate out of the heating furnace passes through the high pressure section of the quencher quickly, and the operating speed of the steel plate in the high pressure section is 2.0-3.0m / min. The method provided by the invention has the characteristics of simple process and good quenching effect, and the problem that the super-thick steel plate which is thicker than 100mm is 'incompletely' quenched is solved.

Description

technical field [0001] The invention belongs to the field of heat treatment. Specifically, the invention relates to a quenching heat treatment method of a steel plate, and more specifically, relates to a quenching treatment method of an extra-thick alloy steel plate with a thickness of more than 100 mm. Background technique [0002] For alloy steel plates, it is difficult to control the quenching process, mainly because: to obtain martensite during quenching, the quenching cooling rate must be greater than the critical cooling rate, and rapid cooling will inevitably cause great damage. Internal stress often causes deformation and cracking of the steel plate. Especially, for extra-thick steel plates over 100mm, currently limited by the cooling capacity of the equipment, water quenching causes a large temperature difference between the core of the steel plate, and as the thickness of the steel plate increases, the quenching cooling rate gradually weakens, and the core cooling ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D6/00C21D1/18C21D9/00C22C38/22
Inventor 吴会亮杜显彬周平霍孝新黄少文冯文义李生根高海军
Owner LAIWU IRON & STEEL GRP
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