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High speed steel composite roller heat treatment method

A heat treatment method and composite roll technology, which is applied in the field of steel rolling, can solve problems such as casting defects and reduce the strength of the bonding layer, and achieve the effects of short cycle time, high production efficiency, and low energy consumption

Inactive Publication Date: 2008-07-09
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The melting point of this molten layer is lower than that of the molten steel in the core, and it becomes the last part to solidify, which is prone to casting defects and reduces the strength of the bonded layer

Method used

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  • High speed steel composite roller heat treatment method
  • High speed steel composite roller heat treatment method
  • High speed steel composite roller heat treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]First, the high-speed steel composite roll is annealed. The outer layer of the high-speed steel composite roll is high-speed steel containing 1.84% C, and the inner layer is low-alloy ductile iron. Heat the high-speed steel composite roll to 890°C for 6 hours, cool in the furnace to 750°C, hold for 3 hours, then cool in the furnace to less than 500°C, take it out of the furnace and air-cool it, and then rough machining. Then induction hardening is carried out on a rated load 1200kVA, 50Hz / 250Hz dual-frequency quenching machine tool. The roll is preheated before induction hardening. The preheating temperature is 300°C, and the preheating and holding time is 8 hours. The 50Hz sensor is located directly above the 250Hz sensor. When heating and quenching, the roll moves down vertically. At this time, the roll is firstly heated by the 50Hz sensor, and then heated by the 250Hz sensor. When quenching and heating, the relationship between the rotation speed of the roll and the d...

Embodiment 2

[0026] First, the high-speed steel composite roll is annealed. The outer layer of the high-speed steel composite roll is high-speed steel containing 2.07% C, and the inner layer is high-strength gray cast iron. Heat the high-speed steel composite roll to 870°C for 10 hours, cool in the furnace to 760°C, hold for 2 hours, then cool in the furnace to less than 500°C, take it out of the furnace and air cool, and then rough process. Induction hardening is then carried out on a rated load 1800kVA, 50Hz / 250Hz dual-frequency quenching machine tool. The roll is preheated before induction hardening. The preheating temperature is 350°C, and the preheating and holding time is 6 hours. The 50Hz sensor is located directly above the 250Hz sensor. When heating and quenching, the roll moves down vertically. At this time, the roll is firstly heated by the 50Hz sensor, and then heated by the 250Hz sensor. When quenching and heating, the relationship between the rotation speed of the roll and th...

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Abstract

A compound rolling heat treatment process of rapid-steel belongs to the steel rolling technology field. The invention comprises conducting annealing treatment for roller with 870-890 DEG C of annealing temperature, warming up for 6-10 hours, proceeding induction quenching on a 50Hz / 250Hz double-frequency quenching machine, preheating the roller before the induction quenching with 280-350 DEG C of preheating temperature for 6-10 hours of preheating warming. The roller is need being rotated and shifted down perpendicularly along axial direction when in quenching heating. The roller is water-cooled fast after heated up, then is conducted the first tempering treatment with 520-560 DEG C, and is insulated tempering for 4-6 hours, and then is cooled down in air. The roller is reheated to 500-540 DEG C to finish the second tempering treatment, and is insulated tempering for 6-8 hours, and is cooled down when the temperature of furnace is cooled smaller than 200 DEG C. The heat treatment technology of the invention treats high speed steel compound rolling, has simple technology, low energy consumption, short production cycle, high rolling strength and excellent use effect, and has excellent economic and social benefits after being popularized and applied.

Description

technical field [0001] The invention relates to a heat treatment method for rolls, in particular to a heat treatment method for high-speed steel composite rolls, and belongs to the technical field of steel rolling. Background technique [0002] High-speed steel has high normal-temperature hardness due to its large amount of alloying elements such as W, Mo, Cr, V, and Co. What is particularly valuable is that compared with ordinary materials, high-speed steel has excellent red hardness, which remains at 500°C. HRC55 or higher, so it has excellent high temperature wear resistance, and has good effect when used to manufacture work rolls of hot rolling mills. Chinese invention patent CN1846887 discloses a high-speed steel composite roll and its manufacturing method. The high-speed steel composite roll of the invention is composed of a roll body and a roll core through centrifugal casting. The material of the roll body is high-carbon high-speed steel, mainly containing The weigh...

Claims

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Application Information

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IPC IPC(8): C21D9/38
Inventor 符寒光邢建东雷永平李明伟吴中伟李辉林健张轶
Owner BEIJING UNIV OF TECH
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