Quenching method for integral cast steel supporting roll

A backup roller and cast steel technology, which is applied in furnaces, heat treatment equipment, heat treatment furnaces, etc., can solve problems that cannot be overcome, and achieve the effects of overcoming defects, reducing total heating energy consumption, and high hardness

Active Publication Date: 2010-04-28
JIANGSU GONGCHANG ROLL
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  • Description
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Problems solved by technology

It still uses the overall same temperature heating method to he

Method used

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  • Quenching method for integral cast steel supporting roll
  • Quenching method for integral cast steel supporting roll

Examples

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Embodiment

[0016] Embodiment: Take the quenching process of an integral cast steel support roll with a diameter of D=1.5 meters as an example. according to figure 1 There are roughly 4 process sections shown. Preheating section: firstly put the integral cast steel support roll in quenched and tempered state after casting into the trolley-type resistance furnace for preheating, heat it to 630°C at a heating rate of 12°C / h, and keep it for 20 hours; then move to the differential temperature Continue heating in the furnace, rotate at a speed of 8rpm, and rapidly heat at a heating rate of 280°C / h to the quenching temperature of 910°C on the surface, stop heating, and keep warm in the furnace for 36 hours until the heat penetration thickness is greater than the required hardened layer Depth, the total energy consumption of heating and heat preservation is about 35,000 kWh, and it takes 56 hours. After the heat preservation is completed, move it into the water quenching machine, rotate it a...

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Abstract

The invention relates to a quenching method of an integral cast steel supporting roll, which is an improvement of the quenching method of the working layer of the integral cast steel supporting roll, and the method is characterized in that the integral heating of the supporting roll comprises the following steps: first, heating the quenched and tempered supporting roll according to a heating rate of less than or equal to 20 DEG C/h to the temperature which is 50-100 DEG C below the cotectic curve temperature, and keeping temperature for 13D-20D; transferring the supporting roll into a differential heating furnace, quickly heating the supporting roll according to the heating rate of greater than or equal to 250 DEG C/h under slow rotation until the surface temperature is greater than or equal to the quenching temperature, and keeping temperature until the thermoosmosis thickness is greater than or equal to the required depth of the hardening layer; transferring the roll into a water quenching machine, carrying out rotating water spray quenching when the surface temperature is greater than or equal to 850 DEG C at the cooling rate of greater than or equal to 2 DEG C/s for the spray quenching of the roll, and stopping spraying water when the surface temperature is less than or equal to 220 DEG C; and transferring the roll into a heating furnace for tempering treatment to obtain the roll of which the surface hardness is 55-75HSD, the uniformity of the surface hardness is less than or equal to +/-1HSD, the radial hardness drop of the hardening layer is less than or equal to 0.5HSD/cm, and the tensile strength of the hardening layer is greater than or equal to 1200MPa. Compared with the prior art, the invention has high hardness of the working layer, good hardness uniformity, good hardening capacity, controllable depth of the hardening layer and small radial hardness drop.

Description

technical field [0001] The invention relates to the field of metal heat treatment, in particular to the improvement of the quenching method for the working layer of integrally cast steel backup rolls. Background technique [0002] Due to the simple production process, compared with forging and composite backup rolls, integral cast steel backup rolls reduce the forging process and composite pouring process, the cost of one-time casting is low, and the performance is stable and reliable. It is more and more popular in cold and hot strip mills. welcome. Due to the restriction of heat treatment equipment and quenching process, the existing technology can only use the overall heating method to heat the backup roll workpiece for the quenching treatment of the working surface of the backup roll. The quenching process is roughly divided into preheating and heat preservation section, spray quenching section and tempering section. In the preheating and heat preservation section, the ...

Claims

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Application Information

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IPC IPC(8): C21D9/38C21D1/18C21D11/00
Inventor 张文君邵黎军储蓓储恩杰
Owner JIANGSU GONGCHANG ROLL
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