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High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof

A technology of centrifugal compounding and preparation process, applied in the field of rolls, which can solve the problems of poor toughness, wear resistance, thermal fatigue crack resistance, etc.

Active Publication Date: 2021-05-04
TANGSHAN XIANLONG ROLL INDAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention proposes a high-nitrogen high-speed steel centrifugal composite roll and its preparation process, which solves the problems of poor toughness, wear and thermal fatigue crack resistance in the prior art

Method used

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  • High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof
  • High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof
  • High-nitrogen high-speed steel centrifugal composite roller and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] S1. Preparation of chemical composition: the outer layer is composed of the following components according to weight percentage: C: 1.8%, Si: 1.0%, Mn: 1.0%, P: 0.030%, S: 0.025%, Cr: 15.0%, Mo: 2.0 %, Ni: 2.0%, V: 0.5%, Nb: 1.0%, W: 1.0%, [N]: 300ppm, the rest is Fe; the chemical composition of the prepared core is: C: 3.5%, Si: 3.0%, Mn : 0.8%, P: 0.10%, S: 0.03%, Mo: 0.5%, Cr: 0.5%, Mg: 0.08, and the rest is Fe;

[0038] S2. Smelting: smelting the outer layer and the core of the roll respectively, the smelting temperatures are 1620°C and 1550°C respectively; when the outer layer of molten iron comes out of the furnace, a modifier is added to the ladle;

[0039] S3. Centrifugal casting: pouring the outer layer, the pouring temperature is 1490°C, when the temperature drops to 1240°C, stop the rotation, and pour the core molten iron at 1380°C after closing the box;

[0040] S4. Heat preservation and slow cooling: conduct heat preservation and slow cooling in the pourin...

Embodiment 2

[0045] S1. Preparation of chemical composition: the outer layer is composed of the following components according to weight percentage: C: 0.8%, Si: 0.3%, Mn: 0.4%, P: 0.020%, S: 0.020%, Cr: 5.0%, Mo: 4.0 %, Ni: 0.5%, V: 5.0%, Nb: 3.0%, W: 5.0%, [N]: 60ppm, the rest is Fe; the chemical composition of the prepared core is: C: 2.5%, Si: 2.0%, Mn : 0.3%, P: 0.02%, S: 0.01%, Mo: 0.1%, Cr: 0.1%, Mg: 0.04, the rest is Fe;

[0046] S2. Smelting: smelting the outer layer and the core of the roll respectively, the smelting temperatures are 1580°C and 1500°C respectively; when the outer layer of molten iron comes out of the furnace, a modifier is added to the ladle;

[0047] S3. Centrifugal casting: pouring the outer layer, the pouring temperature is 1510°C, when the temperature drops to 1260°C, stop the rotation, and pour the core molten iron at 1420°C after closing the box;

[0048] S4. Heat preservation and slow cooling: conduct heat preservation and slow cooling in the pouring pit ...

Embodiment 3

[0053] S1. Preparation of chemical composition: the outer layer is composed of the following components according to weight percentage: C: 1.4%, Si: 0.7%, Mn: 0.6%, P: 0.015%, S: 0.018%, Cr: 10.0%, Mo: 2.0 %, Ni: 1.5%, V: 3.0%, Nb: 2.0%, W: 3.0%, [N]: 150ppm, the rest is Fe; the chemical composition of the prepared core is: C: 3.1%, Si: 2.5%, Mn : 0.5%, P: 0.06%, S: 0.02%, Mo: 0.2%, Cr: 0.15%, Mg: 0.05%, and the rest is Fe.

[0054] S2. Smelting: smelting the outer layer and the core of the roll respectively, the smelting temperatures are 1600°C and 1520°C respectively; when the outer layer of molten iron is released from the furnace, a modifier is added to the ladle;

[0055] S3. Centrifugal casting: pouring the outer layer, the pouring temperature is 1500°C, when the temperature drops to 1245°C, stop the rotation, and pour the core molten iron at 1395°C after closing the box;

[0056] S4. Heat preservation and slow cooling: conduct heat preservation and slow cooling in the ...

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Abstract

The invention relates to the technical field of rollers, and provides a high-nitrogen high-speed steel centrifugal composite roller. The high-nitrogen high-speed steel centrifugal composite roller comprises an outer layer and a core part. The outer layer is made of high-nitrogen high-speed steel and is prepared from the following components in percentage by weight: 0.8-1.8% of C, 0.3-1.0% of Si, 0.4-1.0% of Mn, less than or equal to 0.030% of P, less than or equal to 0.025% of S, 5.0-15.0% of Cr, 0.5-4.0% of Mo, less than or equal to 2.0% of Ni, less than or equal to 5.0% of V, less than or equal to 3.0% of Nb, less than or equal to 5.0% of W, 60-300ppm of [N] and the balance of Fe. The core part is made of high-strength nodular cast iron and comprises the following components in percentage by weight: 2.5-3.5% of C, 2.0-3.0% of Si 2, 0.3-0.8% of Mn, less than or equal to 0.10% of P, less than or equal to 0.03% of S, less than or equal to 0.5% of Mo, less than or equal to 0.5% of Cr, more than or equal to 0.04% of Mg and the balance of Fe. Through the technical scheme, the problems of poor toughness, wear resistance and thermal fatigue crack resistance of the outer layer in the prior art are solved.

Description

technical field [0001] The invention relates to the technical field of rolls, in particular to a high-nitrogen high-speed steel centrifugal composite roll and a preparation process thereof. Background technique [0002] Rolls are very important to the development of the steel industry, especially to the development of rolling mills. Today's roll manufacturing industry in my country has entered a stage of rapid development. The roll manufacturing technology has advanced by leaps and bounds on the basis of the introduction of foreign technology. During the ten years from the end of the 20th century to the beginning of the 21st century, the high-carbon high-speed steel composite work rolls used in the front end of the hot-rolled continuous rolling mill were developed and successfully applied in the world, and an explosion broke out in the roll manufacturing industry. A technological revolution in material innovation. At the same time, the semi-high-speed steel used in the ro...

Claims

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Application Information

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IPC IPC(8): B22D19/16B22D13/00C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C37/10C22C37/06C21D1/18C21D9/38
CPCB22D19/16B22D13/00C22C38/02C22C38/04C22C38/44C22C38/46C22C38/48C22C37/10C22C37/06C21D1/18C21D9/38Y02P10/20
Inventor 倪爱文张建忠张文君苏宇宏倪庆志
Owner TANGSHAN XIANLONG ROLL INDAL
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