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Wear-resistant high-chromium cast iron centrifugal composite roller for ribbon steel two-roller mill and production process

A high-chromium cast iron, two-roll mill technology, applied in the direction of rolls, manufacturing tools, metal rolling, etc., to reduce the tendency of fracture, improve wear resistance and thermal crack resistance, and eliminate tissue stress.

Active Publication Date: 2018-03-09
唐山钢铁集团重机装备有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, high chromium cast iron rolls have much higher wear resistance, toughness, and strength than ordinary cast iron rolls, and also have good high temperature resistance and corrosion resistance. Generally, they are widely used in the front section of finish rolling, while other Excellent properties have not yet been applied to narrow-strip two-high mill rolls

Method used

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  • Wear-resistant high-chromium cast iron centrifugal composite roller for ribbon steel two-roller mill and production process
  • Wear-resistant high-chromium cast iron centrifugal composite roller for ribbon steel two-roller mill and production process
  • Wear-resistant high-chromium cast iron centrifugal composite roller for ribbon steel two-roller mill and production process

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Experimental program
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Effect test

Embodiment 1

[0046] The specification of the composite roll in this embodiment is Φ580*480, the roll number is 16L1665, and the structure is a three-layer centrifugal composite structure. The chemical composition and mass percentage of the material are shown in Table 1, Table 2 and Table 3.

[0047] The production process of the composite roll in this embodiment includes molten iron metamorphism treatment, centrifugal pouring, and heat treatment processes, and the specific process steps are as follows:

[0048] (1) Hot metal modification process: use 1.5t, 1t, 3t intermediate frequency induction furnaces to smelt the working layer, middle layer and core molten iron; after the working layer hydration is cleared, 10kg / t steel is added to the liquid surface to protect the molten iron from oxidation 15 minutes before tapping, add 0.5% ferrovanadium in molten iron, particle size 10mm, add 0.2% ferromanganese particles, particle size 5mm 10 minutes before tapping, add 0.5% ferrochromium nitride,...

Embodiment 2

[0053] The specification of the composite roll in this embodiment is Φ580*480, the roll number is 16L1703, and the structure is a three-layer centrifugal composite structure. The chemical composition and mass percentage of the material are shown in Table 1, Table 2 and Table 3.

[0054] The production process of the composite roll in this embodiment includes molten iron metamorphism treatment, centrifugal pouring, and heat treatment processes, and the specific process steps are as follows:

[0055] (1) Hot metal modification process: use 1.5t, 1t, 3t intermediate frequency induction furnaces to smelt the working layer, middle layer and core molten iron; after the working layer hydration is cleared, 10kg / t steel is added to the liquid surface to protect the molten iron from oxidation 15 minutes before tapping, add 0.5% ferrovanadium with a particle size of 20mm in molten iron, add 0.2% ferromanganese particles with a particle size of 10mm 10 minutes before tapping, add 0.5% fer...

Embodiment 3

[0060] The specification of the composite roll in this embodiment is Φ580*480, the roll number is 16L1732, and the structure is a three-layer centrifugal composite structure. The chemical composition and mass percentage of the material are shown in Table 1, Table 2 and Table 3.

[0061] The production process of the composite roll in this embodiment includes molten iron metamorphism treatment, centrifugal pouring, and heat treatment processes, and the specific process steps are as follows:

[0062] (1) Hot metal modification process: use 1.5t, 1t, 3t intermediate frequency induction furnaces to smelt the working layer, middle layer and core molten iron; after the working layer hydration is cleared, 10kg / t steel is added to the liquid surface to protect the molten iron from oxidation 15 minutes before tapping, add 0.5% ferrovanadium in molten iron, particle size 12mm, add 0.2% ferromanganese particles, particle size 7mm 10 minutes before tapping, add 0.5% ferrochromium nitride,...

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Abstract

The invention discloses a wear-resistant high-chromium cast iron centrifugal composite roller for ribbon steel two-roller mill and a production process. The roller comprises a three-layer centrifugalcomposite structure, a working layer is made of high-chromium cast iron, a middle transition layer is made of graphitic steel, and a roller core portion is made of spheroidal cast iron. The productionprocess includes processes of molten iron modification, centrifugal casting and thermal treatment, wherein the thermal treatment process refers to adopting two sections of stress relief annealing thermal treatment processes. Through reasonable composition design, molten iron modification, special centrifugal casting and thermal treatment, wear resistance and thermostability of the roller are improved remarkably. The roller is safe and reliable to use; compared with common nickel chromium molybdenum infinitely chilled spheroidal cast iron centrifugal rollers, production cost of the roller is reduced by 10-20%, rolled total amount of steel can reach 2-3 times, and the roller has remarkable economic and social benefit when being popularized and applied and can completely replace the common nickel chromium molybdenum infinitely chilled spheroidal cast iron centrifugal rollers.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a wear-resistant high-chromium cast iron centrifugal composite roll for a narrow strip steel two-roll mill and a production process. Background technique [0002] The diameter of the narrow-strip two-high rolling mill is relatively large, and it has a strong biting ability. It is widely used in the rough rolling of the front section of the narrow-strip steel billet. Generally, nickel-chromium-molybdenum infinite chilled nodular cast iron is generally used. , and it is widely used in production enterprises. Therefore, how to improve its wear resistance will directly affect the roll consumption cost of the production enterprise. [0003] Lath-shaped M exists in the matrix of high chromium cast iron material 7 C 3 Type eutectic carbide, chrysanthemum M 2 Type C eutectic carbide and granular M 23 C 6 Type secondary carbide, its matrix structure has excellent anti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C37/08C22C37/10C22C38/44C22C38/04C22C38/02C22C37/04C22C33/08C22C33/04B22D13/02B22D19/16B22D19/08C21D9/38B21B27/03
CPCB21B27/03B22D13/02B22D19/085B22D19/16C21D9/38C22C33/04C22C33/08C22C37/04C22C37/08C22C37/10C22C38/02C22C38/04C22C38/44
Inventor 刘宇肖连华李元春张杰黄明刘宝存高玉章
Owner 唐山钢铁集团重机装备有限公司
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