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Alloy roll ring for hot-rolled seamless steel pipe production and production method thereof

A technology of alloy roll ring and seamless steel pipe, which is applied in the field of metallurgy, can solve problems such as difficult bonding, large radial force, uneven stress of different material layers, etc., and achieve the effect of reducing production cost and improving service life

Active Publication Date: 2019-09-10
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large radial force on the roller ring during the production of seamless steel pipes, a certain degree of flexibility is required between the roller ring and the shaft, and the high manganese molybdenum cast iron material has poor flexibility due to its high strength. , while the graphite steel material has the characteristics of strong flexibility
Centrifugal composite technology is a common method for producing double-layer composite castings. However, due to the difficulty in combining high-manganese-molybdenum cast iron and graphite steel and the uneven stress of different material layers, it is urgent to invent a method that can produce high-manganese outer layers. Process technology of roller ring made of molybdenum cast iron and graphite steel core

Method used

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  • Alloy roll ring for hot-rolled seamless steel pipe production and production method thereof
  • Alloy roll ring for hot-rolled seamless steel pipe production and production method thereof
  • Alloy roll ring for hot-rolled seamless steel pipe production and production method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] In this embodiment, the specification of the centrifugal composite roller ring is Φ280*157, and the roller number is 16L3246. The percentage content is shown in Table 1 and Table 2.

[0038] The production process of the centrifugal composite roller ring in this embodiment also includes the following process steps:

[0039] (1) Iron and molten steel modification process: 1.5t and 1t intermediate frequency induction furnaces are used to smelt the outer layer of molten iron and inner layer of molten steel.

[0040] After the outer metal material is completely melted, add broken glass on the molten iron surface to prevent oxidation. The amount added is 5.3kg per ton of molten metal. 10 minutes before tapping, add ferrovanadium with a molten iron content of 0.4% in the furnace, with a particle size of 10mm. Add 1.0% ferrochromium nitride in 7 minutes, particle size 24mm;

[0041] Add 0.28% of silicon-zirconium alloy and 0.4% of modification treatment agent into the pourin...

Embodiment 2

[0048] The specification of the alloy roll ring in this embodiment is Φ280*157, the roll number is 16L3287, and the structure is a two-layer centrifugal composite structure. The outer layer is made of high manganese molybdenum cast iron, and the inner layer is made of graphite steel. See Table 1 and Table 2 for their content.

[0049] The production process of the alloy roller ring in this embodiment includes iron and molten steel metamorphism treatment, centrifugal casting, and heat treatment processes. The specific process steps are as follows:

[0050] (1) Iron and molten steel modification process: 1.5t and 1t intermediate frequency induction furnaces are used to smelt the outer layer of molten iron and inner layer of molten steel.

[0051] After the outer metal material is completely melted, add broken glass on the molten iron surface to prevent oxidation. The amount added is 5kg per ton of molten metal. 8 minutes before tapping, add ferrovanadium with a molten iron conte...

Embodiment 3

[0059] The specification of the alloy roll ring in this embodiment is Φ280*157, the roll number is 16L3302, and the structure is a two-layer centrifugal composite structure. See Table 1 and Table 2 for their content.

[0060] The production process of the alloy roller ring in this embodiment includes iron and molten steel metamorphism treatment, centrifugal casting, and heat treatment processes. The specific process steps are as follows:

[0061] (1) Iron and molten steel modification process: 1.5t and 1t intermediate frequency induction furnaces are used to smelt the outer layer of molten iron and inner layer of molten steel.

[0062] After the outer metal material is completely melted, add broken glass on the molten iron surface to prevent oxidation. The amount added is 5.7kg per ton of molten metal. 9 minutes before tapping, add ferrovanadium with 0.5% molten iron in the furnace, with a particle size of 18mm. Add 1.0% ferrochrome nitride in 6 minutes, particle size 27mm; ...

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Abstract

The present invention belongs to the technical field of metallurgy, and relates to alloy roll ring for hot rolling seamless steel tube and production method thereof. The alloy roll ring is composed ofan outer layer and an inner layer two-layer centrifugal composite structure, the outer layer of the roll ring is made of the high manganese molybdenum cast iron, and the inner layer is made of the graphite steel. The production method of the alloy roll ring adopts a centrifugal compound casting process, and the process also comprises: cold-type paint spraying, metal liquid smelting and deterioration treatment, centrifugal casting, pit insulation, heat treatment. According to the Alloy roll ring for hot rolling seamless steel tube production and production method thereof, the working layer ofthe invention adopts the high manganese molybdenum cast iron material, makes full use of the characteristics of manganese with high hardness and strength of strong carbide elements and the high toughness and wear resistance of molybdenum, to realize the high strength, high wear resistance and resistance to cold and heat fatigue. Compared with ordinary pearlite and bainite roll ring, its productioncost is reduced by 10 to 15%, and its service life can be increased by 2 to 3 times, which can replace traditional pearlite and bainite roll ring.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for producing an alloy roll ring for hot-rolled seamless steel pipe production. Background technique [0002] With the expansion of the market scale of hot-rolled seamless steel pipes and the increasingly fierce competition in the industry, the requirements for the roll rings used in rolling mills are also increasing, especially to increase the life of the roll rings without increasing the cost Reduce the amount of steel and reduce the number of roller ring replacements, thereby reducing production costs. At present, pearlite and bainite roll rings are widely used in hot-rolled seamless steel pipe production lines, but the ordinary pearlite and bainite materials used can no longer meet the high-paced needs of seamless steel pipe production due to their short service life. Therefore, it has become a trend in the development of the industry to develop a low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C37/10C22C37/08C22C38/02C22C38/04C22C38/08C22C38/12C22C38/34C22C38/22C22C38/40C22C38/44C22C33/08C22C33/06B22D19/16B22D13/04C21D9/40C21D1/30C21D1/28
Inventor 刘宇肖连华李元春张杰黄明曹瑞荣赵海军
Owner TANGSHAN IRON & STEEL GROUP
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