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A rough rolling roll made of graphite steel and its manufacturing method

A rough roll and graphite steel technology, which is applied to rough roll made of graphite steel and its manufacturing field, can solve the problems of roll thermal cracks, poor thermal crack resistance, online wear, etc., and achieve small hardness drop, improved crack resistance, and durability Good grinding performance

Active Publication Date: 2015-10-28
SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The rough rolls of the rough rolling stands of large and medium-sized section steel rolling mills and billet continuous rolling mills are generally made of alloy cast steel or semi-steel. The rolls made of alloy cast steel have the disadvantages of poor wear resistance and serious online wear during use.
Although the wear resistance of semi-steel rolls is higher than that of alloy cast steel rolls, their thermal cracking resistance is poor, and they are prone to cracks and even peeling off during use, especially for rolls with deep holes. In the process of steel making, it is difficult for the cooling water to cool the inside of the deep hole, which makes the hot crack tendency of the roll particularly serious

Method used

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  • A rough rolling roll made of graphite steel and its manufacturing method
  • A rough rolling roll made of graphite steel and its manufacturing method
  • A rough rolling roll made of graphite steel and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this embodiment, the design targets for the alloy composition and weight percentage of the rough roll made of wear-resistant graphite steel are C: 1.20-1.60%, Si: 1.00-1.30%, Mn: 0.50-0.70%, P≤0 .02%; S≤0.02%, Cr: 0.40~1.10%, Ni: 0.20~0.90%, Mo: 0.20~0.40%, and the rest are Fe and unavoidable impurities.

[0027] The manufacture method of the rough roll of this wear-resistant type graphite steel material is:

[0028] A. Make a mold with the aid of a molding machine.

[0029] B. Select the raw materials according to the content ratio of each alloy element in the design target and put them into the electric arc furnace for melting by oxidation method. The melting temperature is 1500℃~1600℃ and the heating rate is 50℃ / h. During the melting process, prevent P and C increase during the reduction period. During the reduction period, use white slag to deoxidize, and use carbon powder and ferrosilicon powder to increase carbon before tapping to ensure that the chemical comp...

Embodiment 2

[0038] This embodiment adopts the same manufacturing method as Embodiment 1, and its difference is:

[0039] The design targets of the alloy composition and weight percentage of the wear-resistant graphite steel rough roll are C: 1.60-2.00%, Si: 1.30-1.90%, Mn: 0.70-1.00%, P≤0.02% ; S≤0.02%, Cr: 1.10-2.50%, Ni: 0.90-1.30%, Mo: 0.40-0.80%, and the rest are Fe and unavoidable impurities.

[0040] In this embodiment, the chemical composition of the blank is analyzed, and the chemical composition and weight percentage are C: 1.60%, Si: 1.50%, Mn: 0.80%, P≤0.01%; S≤0.01%, Cr : 1.40%, Ni: 1.00%, Mo: 0.60%, the rest is Fe and unavoidable impurities.

[0041] In this embodiment, the inspection of qualified products shows that the hardness of the working layer of the rough roll is 51-53HSD, and the hardness uniformity is ≤3HSD. The tensile strength of the roll neck of the rough roll was 565 MPa.

Embodiment 3

[0043] This embodiment adopts the same manufacturing method as Embodiment 1, and its difference is:

[0044] The design targets of the alloy composition and weight percentage of the rough roll made of wear-resistant graphite steel are C: 2.00-2.30%, Si: 1.90-2.20%, Mn: 1.00-1.20%, P≤0.03% ; S≤0.03%, Cr: 2.50-3.50%, Ni: 1.30-2.00%, Mo: 0.80-1.00%, and the rest are Fe and unavoidable impurities.

[0045] In this embodiment, the chemical composition of the blank is analyzed, and the chemical composition and weight percentage are C: 2.10%, Si: 2.00%, Mn: 1.10%, P≤0.02%; S≤0.03%, Cr : 2.80%, Ni: 1.70%, Mo: 0.90%, the rest is Fe and unavoidable impurities.

[0046] In this embodiment, the inspection of qualified products shows that the hardness of the working layer of the rough roll is 48-50HSD, and the hardness uniformity is ≤4HSD. The tensile strength of the roll neck of the rough roll was 510 MPa.

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Abstract

The invention discloses a roughing roll made of a graphitizable steel material and a manufacturing method thereof. The roughing roll comprises the following alloy components by weight percent: 1.20-2.30% of C, 1.00-2.20% of Si, 0.50-1.20% of Mn, less than or equal to 0.03% of P, less than or equal to 0.03% of S, 0.40-3.50% of Cr, 0.20-2.00% of Ni, 0.20-1.00% of Mo, and the balance of Fe and inevitable impurities. The manufacturing method of the roughing roll comprises the steps of smelting, inoculation and spheroidization, casting and heat treatment, wherein in inoculation and spheroidization, an inoculator of aluminum and rare-earth silicon iron magnesium alloy is adopted, the inoculator is added by 1-3 Kg per one ton of liquid steel, and Fe-Si particles and Si-Ca particles are rushed into along with a steel flow in the steel tapping process; after the completion of steel tapping, argon blowing treatment is performed on the liquid steel in a steel ladle, and then standing is carried out for more than 10 minutes so that the temperature of the liquid steel reaches a casting temperature 50 DEG C higher than the melting point of the liquid steel; then casting is carried out. The roughing roll made of the graphitizable steel material provided by the invention has high abrasive resistance, and also has excellent thermal crack resistance and excellent accidental impact resistance.

Description

technical field [0001] The invention relates to a roll and a manufacturing method thereof, in particular to a rough rolling roll made of graphite steel with high wear resistance and thermal crack resistance for rolling mills and a manufacturing method thereof. Background technique [0002] The rough rolls of the rough rolling stands of large and medium-sized section steel mills and billet continuous rolling mills are generally made of alloy cast steel or semi-steel. Rolls made of alloy cast steel have the disadvantages of poor wear resistance and serious online wear during use. Although the wear resistance of semi-steel rolls is higher than that of alloy cast steel rolls, their thermal cracking resistance is poor, and they are prone to cracks and even peeling off during use, especially for rolls with deep holes. In the process of steel making, it is difficult for the cooling water to cool the inside of the deep hole, which makes the hot cracking tendency of the roll particul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/56C22C38/44B22D1/00C21D9/38B21B27/00
Inventor 刘娣彭书平朱志磊
Owner SINOSTEEL XINGTAI MACHINERY & MILL ROLL
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