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Centrifugal cast Cr12MoV shape steel straightening roll and production technology thereof

A technology of centrifugal casting and production technology, which is applied in the field of metallurgy, can solve the problems of inability to forge the inner hole, low service life, and high cost of use, and achieve significant economic and social benefits, high wear resistance, service life, and improved accident resistance Effect

Inactive Publication Date: 2015-12-23
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deformation resistance of section steel is large during the straightening process, and the roll rings of ordinary materials cannot bear the huge deformation resistance. Therefore, the roll rings of straightening rolls at home and abroad are all produced by forging Cr12MoV technology
[0003] However, as a high-carbon, high-chromium cold-work die steel, Cr12MoV has high requirements and difficulties in smelting, forging and heat treatment. Due to the narrow temperature range in the forging process, it often needs to be heated multiple times during forging, and the energy consumption is high. In addition, the straightening rollers on the section steel production line have the characteristics of complex shape, large difference in wall thickness, and various varieties. They are processed by forging methods, and the inner holes generally cannot be forged, and the material utilization rate is about 50%. Utilization rate below 40%
During the forging process, it is very easy to crack and cause waste, and the forging is extremely difficult
In addition, due to the high alloying of the material, it also brings great difficulties to forging, which limits the improvement of the quality of the roll through alloying. At present, a large number of forged straightening rolls of this material are still used in China. Not only the use cost is high, but also the service life Low, especially in rolling large section steel production lines

Method used

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  • Centrifugal cast Cr12MoV shape steel straightening roll and production technology thereof
  • Centrifugal cast Cr12MoV shape steel straightening roll and production technology thereof
  • Centrifugal cast Cr12MoV shape steel straightening roll and production technology thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0060] Produced straightening roller rings with a specification of Φ1300×350 for a steel factory section steel wire (one blank can process three straightening roller rings). The total amount of molten steel is 6600kg, of which the amount of molten steel in the working layer is 4400kg, which is smelted by a 7T intermediate frequency induction furnace, and the amount of molten steel in the inner layer is 2200kg, which is smelted by a 3T intermediate frequency induction furnace.

[0061] The specific process of the production process of the Cr12MoV centrifugal casting straightening roller is as follows:

[0062] A. Composition design: The material of the working layer is Cr12MoV, and the material of the inner layer is graphite steel. The chemical composition and mass percentage are shown in Table 1;

[0063] B. Molten steel treatment before the furnace: working layer Cr12MoV material: 15 minutes before tapping, add ferro-vanadium in the furnace. The particle size of the vanadium-...

Embodiment 2

[0076] The chemical composition and mass percentage of the working layer and inner layer of the straightening roller ring are shown in Table 1. The performance of the straightening roller ring is shown in Table 2.

[0077] The production process difference with embodiment 1 only lies in:

[0078] B. Molten steel treatment before the furnace: working layer Cr12MoV material: 15 minutes before tapping, add ferrovanadium in the furnace, and the particle size of the ferrovanadium is 20mm.

[0079] C. Spraying of cold-type paint: Baking of paint: bake at 150±30°C for 4 hours, heat up to 250±30°C for 3 hours, heat up to 440°C for 8 hours, cool to below 340°C and leave the oven.

Embodiment 3

[0081] The chemical composition and mass percentage of the working layer and inner layer of the straightening roller ring are shown in Table 1. The performance of the straightening roller ring is shown in Table 2.

[0082] The difference with the production process of Example 1 is only: B, molten steel treatment before the furnace: working layer Cr12MoV material: 15 minutes before tapping, iron vanadium was added in the furnace, and the grain size of the iron vanadium was 40mm.

[0083] C. Spraying of cold paint: Baking of paint: bake at 150±30°C for 4 hours, heat up to 250±30°C for 3 hours, heat up to 460°C for 8 hours, cool to below 340°C and leave the oven.

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Abstract

The invention discloses a centrifugal cast Cr12MoV shape steel straightening roll and a production technology thereof. A centrifugal layer of a roll ring comprises a work layer and an inner layer and is cast through two times of centrifugal casting in an interval mode. The material of the work layer is Cr12MoV. The material of the inner layer is graphitic steel. The production technology comprises the steps that molten steel is subjected to the processing procedures of component design, stokehold molten steel treatment, spraying of cold type coating, smelting, centrifugal pouring, pit heat preservation, hot box opening and heat treatment, and the Cr12MoV shape steel straightening roll is obtained. According to the centrifugal cast Cr12MoV shape steel straightening roll and the production technology thereof, the problems that the roll face of a forged straightening roll axially cracks and loses efficacy in the using process are solved. The centrifugal cast Cr12MoV shape steel straightening roll has the characteristics of being high in abrasion resistance and long in service life, and the manufacture cost of the straightening roll is reduced.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a centrifugal casting Cr12MoV type steel straightening roller and a production process thereof. Background technique [0002] With the rapid development of my country's steel industry and increasingly fierce competition, the requirements for steel products are getting higher and higher. Especially in recent years, the country has vigorously developed infrastructure construction, and the demand for section steel has increased sharply. The shape steel has a large deformation resistance during the straightening process, and the roll rings of ordinary materials cannot bear the huge deformation resistance. Therefore, the straightening roll rings at home and abroad are all produced by forging Cr12MoV technology. [0003] However, as a high-carbon, high-chromium cold-work die steel, Cr12MoV has high requirements and difficulties in smelting, forging and heat treatment. Du...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/44C22C38/46B22D13/02
Inventor 刘宇李元春肖连华黄明张杰刘宝存刘双喜李红宇高玉章盛强赵海军曹瑞荣
Owner TANGSHAN IRON & STEEL GROUP
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