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Heat treatment method for 55NiCrMoV7 roller bed roller

A heat treatment method and roller table technology, applied in the field of roll heat treatment, can solve problems such as unsuitable processing of thread holes on the end face of the roll neck, high labor intensity of operators, and influence on the precision of the roller table, so as to achieve good comprehensive performance and ensure hardness uniformity , The effect of improving the accident resistance

Active Publication Date: 2019-03-15
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the traditional process, the 55NiCrMoV7 hot work die steel adopts integral quenching, and the roll body and roll neck are quenched together, but the end face thread hole of the roll neck after quenching is not suitable for processing; if the overall quenching thread hole is drilled and tapped first, it will be deformed or cracked, affecting Roller Roller Accuracy
In addition, when the overall heating and quenching is performed, the oil cooling hardness is low, polluting the environment, oil stains need to be cleaned, the labor intensity of the operators is high, and the quenching oil causes fire hazards

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The 55NiCrMoV7 roller bed has a diameter of 273mm and a length of 500mm. The following are the process steps of quenching:

[0039] 1) Induction preheating: Inductively heat the roll on an intermediate frequency quenching machine tool. During the induction heating process, the operating speed is 75mm / min, and the reciprocating linear motion is made along the roll body to perform cyclic induction preheating on the roll body of the roll. The induction frequency 750Hz. Induction preheating is heated to 500°C to complete the preheating of the entire roll body.

[0040] 2) Induction heating: Continue to use the intermediate frequency quenching machine tool for induction heating. During the induction heating process, the operating speed is 75mm / min, and the reciprocating linear motion is made along the roll body to perform cyclic induction heating on the roll body of the roll. The induction frequency is 830Hz. Heat the roll to 850°C for full austenitization and keep it warm...

Embodiment 2

[0046] The 55NiCrMoV7 roller bed has a diameter of 205mm and a length of 600mm. The following are the process steps of quenching:

[0047] 1) Induction preheating: Inductively heat the roll on an intermediate frequency quenching machine tool. During the induction heating process, the operating speed is 55mm / min, and the reciprocating linear motion is made along the roll body to perform cyclic induction preheating on the roll body of the roll. The induction frequency 530Hz. Induction preheating is heated to 580°C to complete the preheating of the entire roll body.

[0048]2) Induction heating: Continue to use the intermediate frequency quenching machine tool for induction heating. During the induction heating process, the operating speed is 52mm / min, and the reciprocating linear motion is made along the roll body to perform cyclic induction preheating on the roll body of the roll. The induction frequency is 560Hz. Heat the roll to 880°C for full austenitization and keep it wa...

Embodiment 3

[0054] The 55NiCrMoV7 roller bed has a diameter of 255mm and a length of 1000mm. The following are the process steps of quenching:

[0055] 1) Induction preheating: The roll is heated by induction on a medium frequency quenching machine tool. During the induction heating process, the operating speed is 30mm / min, and the reciprocating linear motion is made along the roll body to perform cyclic induction preheating on the roll body of the roll. The induction frequency 200Hz. Induction preheating is heated to 700°C to complete the preheating of the entire roll body.

[0056] 2) Induction heating: Continue to use the intermediate frequency quenching machine tool for induction heating. During the induction heating process, the operating speed is 30mm / min, and the reciprocating linear motion is made along the roll body to perform cyclic induction preheating on the roll body of the roll. The induction frequency is 200Hz. Heat the roll to 940°C for full austenitization and keep it w...

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Abstract

The invention relates to a heat treatment method for a 55NiCrMoV7 roller bed roller, belonging to the technical field of roller heat treatment, and including the following process steps: 1) inductionpreheating: a roller is inductively heated on a quenching machine tool and heated to 500-700 DEG C, and the whole roller body is preheated; 2) induction heating: the preheated roller is heated to 840-940 DEG C for full austenitization and heat preservation; 3) pre-cooling: the roller is pre-cooled to 760-810 DEG C; 4) water cooling: the pre-cooled roller is water-cooled to 40-110 DEG C; and 5) medium temperature tempering: the roller is heated to 350-450 DEG C, kept for 15-25 h, and air-cooled. The roller bed roller produced by the heat treatment method of the invention has good wear resistance, high accident resistance, high corrosion resistance, long service life, low use cost and good comprehensive performance. The invention has low energy consumption and low production cost.

Description

technical field [0001] The invention relates to a heat treatment method for a 55NiCrMoV7 roller table, belonging to the technical field of roll heat treatment. Background technique [0002] With the increasing number of continuous casting and rolling and wide and thick plate production projects in steel mills, higher requirements are put forward for the manufacturing technology of large and super long rollers. In the production of steelmaking and continuous casting, one rolling mill needs 48 pieces of roller table, which consumes a lot. Its service life and quality have a direct impact on improving product quality and production capacity. In high-speed load operation, the roller table roller is in contact with the high-temperature slab, and solid particles such as oxidation and scale cause roller surface wear, which requires shutdown and unloading of the roller for repair. In addition, rolling contact fatigue under heavy load and high frequency and large load Under the acti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D9/38C21D1/18C21D1/10
CPCC21D1/10C21D1/18C21D9/38C21D2221/10Y02P10/25
Inventor 王春祥曹文娟刘士峰
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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